AT24c04 的datasheet

1

Features

?Medium-voltage and Standard-voltage Operation –5.0 (V CC = 4.5V to 5.5V)–2.7 (V CC = 2.7V to 5.5V)

?Internally Organized 128 x 8 (1K), 256 x 8 (2K), 512 x 8 (4K),1024 x 8 (8K) or 2048 x 8 (16K)?Two-wire Serial Interface

?Schmitt Trigger, Filtered Inputs for Noise Suppression ?Bi-directional Data Transfer Protocol

?100 kHz (2.7V) and 400 kHz (5V) Compatibility ?Write Protect Pin for Hardware Data Protection

?8-byte Page (1K, 2K), 16-byte Page (4K, 8K, 16K) Write Modes ?Partial Page Writes are Allowed ?Self-timed Write Cycle (5 ms max)?High-reliability

–Endurance: 1 Million Write Cycles –Data Retention: 100 Years

?

8-lead PDIP and 8-lead JEDEC SOIC Packages

Description

The AT24C01A/02/04/08/16 provides 1024/2048/4096/8192/16384 bits of serial elec-

trically erasable and programmable read-only memory (EEPROM) organized as 128/256/512/1024/2048 words of 8 bits each. The device is optimized for use in many automotive applications where low-power and low-voltage operation are essential.The AT24C01A/02/04/08/16 is available in space-saving 8-lead PDIP and 8-lead JEDEC SOIC packages and is accessed via a two-wire serial interface. In addition,the entire family is available in 5.0V (4.5V to 5.5V) and 2.7V (2.7V to 5.5V) versions.Table 1. Pin Configuration

Pin Name Function A0 - A2Address Inputs SDA Serial Data SCL Serial Clock Input WP Write Protect NC

No Connect

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Figure 1. Block Diagram

Pin Description

SERIAL CLOCK (SCL): The SCL input is used to positive edge clock data into each EEPROM device and negative edge clock data out of each device.

SERIAL DATA (SDA): The SDA pin is bidirectional for serial data transfer. This pin is open-drain driven and may be wire-ORed with any number of other open-drain or open-collector devices.

DEVICE/PAGE ADDRESSES (A2, A1, A0): The A2, A1 and A0 pins are device address inputs that are hard wired for the AT24C01A and the AT24C02. As many as eight 1K/2K devices may be addressed on a single bus system (device addressing is discussed in detail under the Device Addressing section).

The AT24C04 uses the A2 and A1 inputs for hard wire addressing and a total of four 4K devices may be addressed on a single bus system. The A0 pin is a no connect.

Absolute Maximum Ratings

Operating Temperature ......................................?55°C to +125°C *NOTICE:

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent dam-age to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Storage Temperature .........................................?65°C to +150°C Voltage on Any Pin

with Respect to Ground ........................................?1.0V to +7.0V Maximum Operating Voltage ..........................................6.25V DC Output Current........................................................

5.0 mA

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The AT24C08 only uses the A2 input for hardwire addressing and a total of two 8K devices may be addressed on a single bus system. The A0 and A1 pins are no connects.

The AT24C16 does not use the device address pins, which limits the number of devices on a single bus to one. The A0, A1 and A2 pins are no connects.

WRITE PROTECT (WP): The AT24C01A/02/04/16 has a Write Protect pin that provides hardware data protection. The Write Protect pin allows normal read/write operations when connected to ground (GND). When the Write Protect pin is connected to V CC , the write protection feature is enabled and operates as shown see Table 2.Table 2. Write Protect

Notes:

1.This device is not recommended for new designs. Please refer to A T24C08A.

2.This device is not recommended for new designs. Please refer to A T24C16A.

Memory Organization

AT24C01A, 1K SERIAL EEPROM: Internally organized with 16 pages of 8 bytes each,the 1K requires a 7-bit data word address for random word addressing.

AT24C02, 2K SERIAL EEPROM: Internally organized with 32 pages of 8 bytes each,the 2K requires an 8-bit data word address for random word addressing.

AT24C04, 4K SERIAL EEPROM: Internally organized with 32 pages of 16 bytes each,the 4K requires a 9-bit data word address for random word addressing.

AT24C08, 8K SERIAL EEPROM: Internally organized with 64 pages of 16 bytes each,the 8K requires a 10-bit data word address for random word addressing.

AT24C16, 16K SERIAL EEPROM: Internally organized with 128 pages of 16 bytes each, the 16K requires an 11-bit data word address for random word addressing.

WP Pin Status

Part of the Array Protected

24C01A 24C0224C0424C08(1)24C16(2)At V CC

Full (1K) Array

Full (2K) Array

Full (4K) Array

Normal Read/Write Operation

Upper Half (8K) Array

At GND Normal Read/Write Operations

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Note:

1.This parameter is characterized and is not 100% tested.

Notes:

1.V IL min and V IH max are reference only and are not tested.

Table 3. Pin Capacitance (1)

Applicable over recommended operating range from T A = 25°C, f = 1.0 MHz, V CC = +2.7V.

Symbol Test Condition

Max Units Conditions C I/O Input/Output Capacitance (SDA)8pF V I/O = 0V C IN Input Capacitance (A 0, A 1, A 2, SCL)

6

pF

V IN = 0V

Table 4. DC Characteristics

Applicable over recommended operating range from: T A = ?40°C to +125°C, V CC = +2.7V to +5.5V (unless otherwise noted).

Symbol Parameter Test Condition

Min Typ

Max Units V CC1Supply Voltage 2.7 5.5V V CC2Supply Voltage

4.5

5.5V I CC Supply Current V CC = 5.0V READ at 100 kHz 0.4 1.0mA I CC Supply Current V CC = 5.0V WRITE at 100 kHz 2.0 3.0mA I SB1Standby Current V CC = 2.7V V IN = V CC or V SS 1.6 4.0μA I SB2Standby Current V CC = 5.0V V IN = V CC or V SS 8.018.0μA I LI Input Leakage Current V IN = V CC or V SS 0.10 3.0μA I LO Output Leakage Current V OUT = V CC or V SS

0.05 3.0μA V IL Input Low Level (1)?0.6V CC x 0.3V V IH Input High Level (1)

V CC x 0.7

V CC + 0.5V V OL2Output Low Level V CC = 3.0V I OL = 2.1 mA 0.4V V OL1Output Low Level V CC = 1.8V

I OL = 0.15 mA 0.2

V

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Notes:

1.The A T24C01A/02/04/08 bearing the process letter “D” on the package (the mark is located in the lower right corner on the

topside of the package), guarantees 400 kHz (2.5V , 2.7V).

2.This parameter is characterized and is not 100% tested (T A = 25°C).

3.This parameter is characterized and is not 100% tested.

Device Operation

CLOCK and DATA TRANSITIONS: The SDA pin is normally pulled high with an exter-nal device. Data on the SDA pin may change only during SCL low time periods (see Figure 4 on page 7). Data changes during SCL high periods will indicate a start or stop condition as defined below.

START CONDITION: A high-to-low transition of SDA with SCL high is a start condition which must precede any other command (see Figure 5 on page 7).

STOP CONDITION: A low-to-high transition of SDA with SCL high is a stop condition.After a read sequence, the stop command will place the EEPROM in a standby power mode (see Figure 5 on page 7).

ACKNOWLEDGE: All addresses and data words are serially transmitted to and from the EEPROM in 8-bit words. The EEPROM sends a zero to acknowledge that it has received each word. This happens during the ninth clock cycle.

Table 5. AC Characteristics

Applicable over recommended operating range from T A = ?40°C to +125°C, V CC = +2.7V to +5.5V, CL = 1 TTL Gate and 100 pF (unless otherwise noted).

Symbol Parameter

AT24C01A/02/04/08,

2.7V

AT24C16, 2.7V AT24C01A/02/04/08/16,

5.0V Units Min Max Min

Max Min

Max f SCL Clock Frequency, SCL 400(1)

400

400

kHz t LOW Clock Pulse Width Low 1.2 1.2 1.2μs t HIGH Clock Pulse Width High 0.6

0.6

0.6

μs

t I Noise Suppression Time (2)50

50

50

ns t AA Clock Low to Data Out Valid 0.10.9

0.10.9

0.10.9

μs t BUF Time the bus must be free before a new transmission can start (3) 1.2 1.2 1.2μs t HD.STA Start Hold Time 0.60.60.6μs t SU.STA Start Set-up Time 0.60.60.6μs t HD.DAT Data In Hold Time 000μs t SU.DA T Data In Set-up Time 100

100

100

ns

t R Inputs Rise Time (3)300300300ns t F Inputs Fall Time (3)300

300

300

ns t SU.STO Stop Set-up Time 0.60.60.6μs t DH Data Out Hold Time 50

50

50

ns

t WR

Write Cycle Time 5

5

5

ms Endurance

5.0V , 25°C

1M

1M

1M

Write Cycles

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STANDBY MODE: The AT24C01A/02/04/08/16 features a low-power standby mode which is enabled: (a) upon power-up and (b) after the receipt of the Stop bit and the completion of any internal operations.

MEMORY RESET: After an interruption in protocol, power loss or system reset, any 2-wire part can be reset by following these steps:1.Clock up to 9 cycles.

2.Look for SDA high in each cycle while SCL is high.

3.Create a start condition.

Bus Timing

Figure 2. SCL: Serial Clock, SDA: Serial Data I/O

Write Cycle Timing

Figure 3. SCL: Serial Clock, SDA: Serial Data I/O

Note:

1.The write cycle time t WR

is the time from a valid stop condition of a write sequence to the end of the internal clear/write cycle.

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Figure 4. Data Validity

Figure 5. Start and Stop Definition

Figure 6.

Output Acknowledge

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Device Addressing

The 1K, 2K, 4K, 8K and 16K EEPROM devices all require an 8-bit device address word following a start condition to enable the chip for a read or write operation (see Figure 7on page 9).

The device address word consists of a mandatory one, zero sequence for the first four most significant bits as shown. This is common to all the EEPROM devices.

The next 3 bits are the A2, A1 and A0 device address bits for the 1K/2K EEPROM.These 3 bits must compare to their corresponding hard-wired input pins.

The 4K EEPROM only uses the A2 and A1 device address bits with the third bit being a memory page address bit. The two device address bits must compare to their corre-sponding hard-wired input pins. The A0 pin is no connect.

The 8K EEPROM only uses the A2 device address bit with the next 2 bits being for memory page addressing. The A2 bit must compare to its corresponding hard-wired input pin. The A1 and A0 pins are no connect.

The 16K does not use any device address bits but instead the 3 bits are used for mem-ory page addressing. These page addressing bits on the 4K, 8K and 16K devices should be considered the most significant bits of the data word address which follows.The A0, A1 and A2 pins are no connect.

The eighth bit of the device address is the read/write operation select bit. A read opera-tion is initiated if this bit is high and a write operation is initiated if this bit is low.Upon a compare of the device address, the EEPROM will output a zero. If a compare is not made, the chip will return to a standby state.

Write Operations

BYTE WRITE: A write operation requires an 8-bit data word address following the device address word and acknowledgment. Upon receipt of this address, the EEPROM will again respond with a zero and then clock in the first 8-bit data word. Following receipt of the 8-bit data word, the EEPROM will output a zero and the addressing device, such as a microcontroller, must terminate the write sequence with a stop condi-tion. At this time the EEPROM enters an internally timed write cycle, t WR , to the nonvolatile memory. All inputs are disabled during this write cycle and the EEPROM will not respond until the write is complete (see Figure 8 on page 10).

PAGE WRITE: The 1K/2K EEPROM is capable of an 8-byte page write, and the 4K, 8K and 16K devices are capable of 16-byte page writes.

A page write is initiated the same as a byte write, but the microcontroller does not send a stop condition after the first data word is clocked in. Instead, after the EEPROM acknowledges receipt of the first data word, the microcontroller can transmit up to seven (1K/2K) or fifteen (4K, 8K, 16K) more data words. The EEPROM will respond with a zero after each data word received. The microcontroller must terminate the page write sequence with a stop condition (see Figure 9 on page 10).

The data word address lower three (1K/2K) or four (4K, 8K, 16K) bits are internally incremented following the receipt of each data word. The higher data word address bits are not incremented, retaining the memory page row location. When the word address,internally generated, reaches the page boundary, the following byte is placed at the beginning of the same page. If more than eight (1K/2K) or sixteen (4K, 8K, 16K) data words are transmitted to the EEPROM, the data word address will “roll over” and previ-ous data will be overwritten.

ACKNOWLEDGE POLLING: Once the internally timed write cycle has started and the EEPROM inputs are disabled, acknowledge polling can be initiated. This involves send-

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ing a start condition followed by the device address word. The read/write bit is representative of the operation desired. Only if the internal write cycle has completed will the EEPROM respond with a zero allowing the read or write sequence to continue.

Read Operations

Read operations are initiated the same way as write operations with the exception that the read/write select bit in the device address word is set to one. There are three read operations: current address read, random address read and sequential read.

CURRENT ADDRESS READ: The internal data word address counter maintains the last address accessed during the last read or write operation, incremented by one. This address stays valid between operations as long as the chip power is maintained. The address “roll over” during read is from the last byte of the last memory page to the first byte of the first page. The address “roll over” during write is from the last byte of the cur-rent page to the first byte of the same page.

Once the device address with the read/write select bit set to one is clocked in and acknowledged by the EEPROM, the current address data word is serially clocked out.The microcontroller does not respond with an input zero but does generate a following stop condition (see Figure 10 on page 10).

RANDOM READ: A random read requires a “dummy” byte write sequence to load in the data word address. Once the device address word and data word address are clocked in and acknowledged by the EEPROM, the microcontroller must generate another start condition. The microcontroller now initiates a current address read by sending a device address with the read/write select bit high. The EEPROM acknowledges the device address and serially clocks out the data word. The microcontroller does not respond with a zero but does generate a following stop condition (see Figure 11 on page 11).SEQUENTIAL READ: Sequential reads are initiated by either a current address read or a random address read. After the microcontroller receives a data word, it responds with an acknowledge. As long as the EEPROM receives an acknowledge, it will continue to increment the data word address and serially clock out sequential data words. When the memory address limit is reached, the data word address will “roll over” and the sequen-tial read will continue. The sequential read operation is terminated when the microcontroller does not respond with a zero but does generate a following stop condi-tion (see Figure 12 on page 11).Figure 7.

Device Address

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Figure 8. Byte Write

Figure 9. Page Write

(* = DON’T CARE bit for 1K)

Figure 10.

Current Address Read

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Figure 11. Random Read

(* = DON’T CARE bit for 1K)

Figure 12.

Sequential Read

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AT24C01A Ordering Information

Ordering Code Package Operation Range A T24C01A-10P A-5.0C A T24C01A-10SA-5.0C 8P38S1Automotive (?40°C to 125°C)A T24C01A-10P A-2.7C A T24C01A-10SA-2.7C

8P38S1

Automotive (?40°C to 125°C)

Package Type

8P38-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)

8S1

8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)

Options

?5.0Standard Operation (4.5V to 5.5V)?2.7

Low-voltage (2.7V to 5.5V)

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AT24C02 Ordering Information

Ordering Code Package Operation Range A T24C02-10P A-5.0C A T24C02N-10SA-5.0C 8P38S1Automotive (?40°C to 125°C)A T24C02-10P A-2.7C A T24C02N-10SA-2.7C

8P38S1

Automotive (?40°C to 125°C)

Package Type

8P38-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)

8S1

8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)

Options

?5.0Standard Operation (4.5V to 5.5V)?2.7

Low-voltage (2.7V to 5.5V)

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AT24C04 Ordering Information

Ordering Code Package Operation Range A T24C04-10P A-5.0C A T24C04N-10SA-5.0C 8P38S1Automotive (?40°C to 125°C)A T24C04-10P A-2.7C A T24C04N-10SA-2.7C

8P38S1

Automotive (?40°C to 125°C)

Package Type

8P38-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)

8S1

8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)

Options

?5.0Standard Operation (4.5V to 5.5V)?2.7

Low-voltage (2.7V to 5.5V)

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Note:

1.This device is not recommended for new designs. Please refer to A T24C08A.

AT24C08(1) Ordering Information

Ordering Code Package Operation Range A T24C08-10P A-5.0C A T24C08N-10SA-5.0C 8P38S1Automotive (?40°C to 125°C)A T24C08-10P A-2.7C A T24C08N-10SA-2.7C 8P38S1

Automotive (?40°C to 125°C)

Package Type

8P38-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)

8S1

8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)

Options

?5.0Standard Operation (4.5V to 5.5V)?2.7

Low-voltage (2.7V to 5.5V)

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Note:

1.This device is not recommended for new designs. Please refer to A T24C16A.

AT24C16(1) Ordering Information

Ordering Code Package Operation Range A T24C16-10P A-5.0C A T24C16N-10SA-5.0C 8P38S1Automotive (?40°C to 125°C)A T24C16-10P A-2.7C A T24C16N-10SA-2.7C 8P38S1

Automotive (?40°C to 125°C)

Package Type

8P38-lead, 0.300" Wide, Plastic Dual Inline Package (PDIP)

8S1

8-lead, 0.150" Wide, Plastic Gull Wing Small Outline (JEDEC SOIC)

Options

?5.0Standard Operation (4.5V to 5.5V)?2.7

Low-voltage (2.7V to 5.5V)

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Packaging Information

8P3 – PDIP

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8S1 – JEDEC SOIC

3256F–SEEPR–10/04

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IC-HK_datasheet

Rev 21.11.01, Page 1/13 current of 100mA pulse current of 100mA Fig. 2: Signal patterns for Example 1 -pulse current of 100mA APPLICATION NOTES Setting the laser current When switching DC currents of up to 150mA or pulse currents of up to 700mA one channel is sufficient (Example 1). Input ENx of the unused channel should be jumpered to GND and pin AGNDx left open. Higher currents or several different current levels can be obtained by using both channels (Example 2 and 3).Example 1:Switching a current of 100mA 1. 100mA < 150mA | one channel 2. Switching on and off only | RK can be omitted (RK = 0S ) 3. As shown in Figure 1 (cf. data sheet, Figures 2..4), the required voltage V(CI) for RK = 0S is read off at I(LDK) = 100mA as V(CI) =1.75V With the circuit shown in Figure 3 and a voltage of 1.75V at pin CI the laser current can be switched between typically 0mA and 100mA by applying an appropriate pulse pattern to EN1.

芯片数据手册Datasheet热门问题

芯片数据手册Datasheet热门问题 ?如何正确的阅读Datasheet？ 不仅仅是芯片，包括工具、设备几乎任何电子产品，都需要去阅读它的datasheet，除了包括最低、最高要求，特点，建议和用途及其兼容的设备等等，更重要的是原厂商以一个成功者的身份去告诉你一些注意事项。 Datasheet一般组成的字段：（LM317举例） ①日期：首先检查发布日期，是预备版还是修正版 ②厂商：检查厂商，因为相同型号不同厂商的器件，性能或许不同 ③描述（Description）：往往会告诉你一些一般地方没有提到的功能或者用法。比如：你可能需要保持一个特殊的引脚为低电平才能完成某个操作。 ④特点（Features）：告诉你常规特征。确认电器特征相应的条件 ⑤应用（Application）：通常简洁的告诉你该器件是否在你的应用领域；如果这个芯片有你需要的功能，它可以给予你很好的提示。但是这里给出的功能往往都是很一般（常用）的功能 ⑥封装图：不同的封装引脚的位置一般不同，但引脚的总是一般是相同的，需要注意不同位置的引脚及其每个引脚的功能 ⑦性能坐标图：通常描述电流测量与电压的变化曲线，通常会标明25℃（室温） ⑧电气特性表格：通常是芯片参数-条件-变化范围的表格，即相同参数条件不同，输出范围在Min-Typ-Max 之间 ?是不是所有芯片都有Datasheet？ 理论上所有芯片都有它对应的datasheet，但是有些芯片是属于定制器件，例如：手机、PC、PAD里面的芯片。往往原厂商只公开它的一般描述、一般特点、一般应用，少许的会公开参数，所以像这样的datasheet 我们正常是拿不到的，这就是为什么有时候一款芯片我们翻江倒海，翻山越岭也没找到的原因了，不过也有些芯片可以通过向原厂商提交申请，审核通过后会提供给你。 ?职业不同如何避轻就重去读Datasheet？ 当我们用到datasheet时，有时候没必要从头读到尾，那样会花费大量的时间。Datasheet中涉及到芯片的方方面面，硬件、软件、工艺、制程技术、封装等等，学会抓住关键字词，了解我们所需要的信息，比如：我们想了解AO4459这款P沟道场效应MOSFET ①如果咱们是做硬件，需主要关注Drain-Source Voltage（漏源电压）, Gate-Source Voltage（门源电压）, Continuous Drain Current（连续漏电流），Pulsed Drain Current（漏电流脉冲）等等，能够看懂热特性曲线图（TYPICAL ELECTRICAL AND THERMAL CHARACTERISTICS）；

如何看datasheet+8页(绝对有用)

How to Read a Datasheet Prepared for the WIMS outreach program 5/6/02, D. Grover In order to use a PIC microcontroller, a flip-flop, a photodetector, or practically any electronic device, you need to consult a datasheet. This is the to. Where do you find datasheets? Nowadays you can find almost any datasheet on the internet, often in PDF (Acrobat) form. For example, the LM555 datasheet from National Semiconductor is on their website at https://www.sodocs.net/doc/0317706324.html,.

LM555Timer General Description The LM555is a highly stable device for generating accurate time delays or oscillation.Additional terminals are provided for triggering or resetting if desired.In the time delay mode of operation,the time is precisely controlled by one external re-sistor and capacitor.For astable operation as an oscillator,the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor.The circuit may be triggered and reset on falling waveforms,and the output circuit can source or sink up to 200mA or drive TTL circuits. Features n Direct n Timing n Operates n Adjustable n Output n Output n Temperature n Normally n Available Applications n Precision n Pulse n Sequential DS007851-1 有时常规描述（General Description ）会给出一些其它地方没提到的特性或者用法。特性（确认电气特性所在的条件以及特殊情况。 通常叫做等效原理图，该原理不是该芯片中必须的，但是该芯片将按照里面的来运作。它能帮助解释在数据手册中未被描述的行为。能把这个电路在面包板上搭出来吗？除非您知道那些并未给出参数的晶体管的参数。 总会有一个日期。数据手册变动，尤其是预备版或者修正版，核对一下日期。

常用的十大电子元器件Datasheet

常用的十大电子元器件Datasheet 元器件数据表（datasheet）是电子工程师项目开发时经常使用到的手册。Datasheet（数据手册）包含了电子芯片的各项参数，电性参数，物理参数，甚至制造材料，使用建议等，一般由厂家编写，内容形式一般为说明文字，各种特性曲线，图表，数据表等。下面介绍一下常用的十大电子元件： 1、DS18B20温度传感器273W百度收录总数 常用指数：★★★★★ DS18B20是Dallas公司生产的数字温度传感器，具有体积小、适用电压宽、经济灵活的特点。它内部使用了onboard专利技术，全部 传感元件及转换电路集成在一个形如三极管的集成电路内。DS18B20有电源线、地线及数据线3根引脚线，工作电压范围为3～5.5 V ，支持单总线接口。 免费下载：DS18B20 2、TL431可控精密稳压源244W 常用指数：★★★★ TL431是由德州仪器生产，所谓TL431就是一个有良好的热稳定性能的三端可调分流基准源。它的输出电压用两个电阻就可以任意地 设置到从Vref(2.5V)到36V范围内的任何值(如图1)。该器件的典型动态阻抗为0.2Ω，在很多应用中可以用它代替齐纳二极管，例如， 数字电压表，运放电路、可调压电源，开关电源等等。 免费下载：TL431

LM358双运算放大器238W 常用指数：★★★★ LM358双运算放大器，适合于电源电压范围很宽的单电源使用，也适用于双电源工作模式，在推荐的工作条件下，电源电流与电源电压无关。它的使用范围包括传感放大器、直流增益模块和其他所有可用单电源供电的使用运算放大器的场合。 免费下载：LM358 4、LM324四路运算放大器236W 常用指数：★★★★ LM324系列是低成本的四路运算放大器，具有真正的差分输入。在单电源应用中，它们与标准运算放大器类型相比具有几个明显的优 势。该四路放大器可以工作于低至3.0 V或高达32 V的电源电压，静态电流是MC1741的五分之一左右（每个放大器）。共模输入范围 包括负电源，因此在众多应用中无需外部偏置元器件。输出电压范围也包括负电源电压。免费下载：LM324 5、DAC0832数模转换芯片157W 常用指数：★★★ DAC0832是8分辨率的D/A转换集成芯片。与微处理器完全兼容。这个DA芯片以其价格低廉、接口简单、转换控制容易等优点，在单 片机应用系统中得到广泛的应用。D/A转换器由8位输入锁存器、8位DAC寄存器、8位D/A转换电路及转换控制电路构成。 免费下载：DAC0832

IP178D 芯片datasheet

IP178D
Preliminary Data Sheet
8 Port 10/100 Ethernet Integrated Switch
(Port Mirror, TCP/UDP QoS & VIP Port QoS)
Features
Wide operating temperature range IP178D LF (0°C to 70°C) IP178D LFI (-40°C to 85°C) IP178C pin to pin compatible Support 2k MAC address Support auto-polarity for 10 Mbps Support filter/forward special DA option Support broadcast storm protection Auto MDI-MDIX option Two queues per port for QoS purposes Support Port based QoS Support 802.1p & DiffServ based QoS QoS Port base 802.1p IP DiffServ IPV4/IPV6 TCP/UDP port number Pins configure ports priority (VIP port) Support max forwarding packet length 1552/1536 bytes option Support port mirror function Support two dynamic fiber ports for Hot Plug Built in linear regulator control circuit Support Lead Free package (Please refer to the Order Information) 0.16um Process
General Description
IP178D integrates an 8-port switch controller, SSRAM, and 8 10/100 Ethernet transceivers. Each of the transceivers complies with the IEEE 802.3, IEEE 802.3u, and IEEE 802.3x specifications. The transceivers are designed in DSP approach in 0.16um technology; they have high noise immunity and robust performance. IP178D supports a lot of QoS function, including 802.1p, DiffServ, TCP/UDP port number and High priority port. User could enable QoS function from Pin or EEPROM. IP178D also supports port mirror function for each port. User could monitor RX and TX port. There are two fiber ports, port 6 and port 7, could be enable and disable from pin.
1 / 56 Copyright ? 2007, IC Plus Corp.
December 23, 2008 IP178D-DS-R01

ALLDATASHEET

ALLDATASHEET是全球电子元器件数据手册库，在这里你可以搜索到近两千万个电子元器件型号的数据。万联芯城是国内知名的电子元器件采购网，专为客户提供一站式电子元器件配单服务，所售电子元器件均为原装现货，满足客户所有物料需求。点击进入万联芯城 点击进入万联芯城

ALLDATASHEET是全球电子元器件数据手册库，提供了近2000万个元器件型号的PDF数据手册，声称“如果在本站没有找到，那么别的地方不可能再有”。ALLDATASHEET强大的资源搜集能力让它成为电子工程师的必备网站，在这里他们可以找到他们想要的一切资料，并完成他们的研发。 ALLDATASHEET每一份数据手册对应的型号出自其原厂，不管是固件工程师、硬件研发人员亦或者板子维修员，想要用最快、最省时间的方法去了解一个芯片，那么，无疑是从ALLDATASHEET去寻找。ALLDATASHEET内的芯片手册，会因为从事的行业不同，而关注不同的点。当然，如果你还没正式工作，只是一名学生的话，这本科技英语非常的适合你阅读。 一般ALLDATASHEET会先从芯片特性到应用场合，最后到内部框架去了解。当然，这里所指的了解是宏观的，对于芯片这种注重细节的物件，微观上才是让我们兴奋的点。芯片参数、管脚定义、内部寄存器任何一个都要研究透彻。连手册中的注意部分都不要放过。 我更偏向于将你们所称谓的ALLDATASHEET当作是一个说明书来读，一般的芯片指导书太过拗口，而说明书为了让使用者看懂，除了专业词汇，都尽量的使用了通俗易懂的语句。尽管如此，想要看懂一个元

器件厂商所写的数据手册，首先你还是要具备一定的英语、电气技术(电子技术、电气)、微机原理技能。一个不懂OC的人是无法看懂数 据手册的。 假设，你在犹豫入手某一块MOS管芯片，你在ALLDATASHEET下载好 对应的数据手册后，首先，要浏览的是简介!很多人以为简介只是介 绍厂家信息及芯片数据，从简介中你能够知道该芯片功能及应用范围，包括输入输出的电流电压、功率大小、工作温度等。MOS管芯片一般涉及电源及驱动，也就是电气特性，你需要从手册中了解这方面的信息，看是否符合你所使用的范围，这些在ALLDATASHEET网站中都能 帮到你。

NK510超外差接收芯片Datasheet

NK51 产品特征 ● 300MHz 到440MHz 的频率范围 ● 工作电压：2.2V-3.6V ● 接受灵敏度高：-110dBm ● 数据传输速率达10kbps （固定模式） ● 低功耗 ? 315MHz 下，最大工作电流2mA 433MHZ 下，最大工作电流2.5mA ? 关闭时的电流为0.9uA ? 扫描操作时（10：1任务周期操作） 电流为300uA ● 唤醒输出标记用来启动解码器和微处理器 ● 天线处的射频辐射非常低 ● 集成度高，外部器件需求少 应用领域 ● 汽车远程无钥匙进入（RKE ） ● 远程控制 ● 远程风扇和电灯控制 ● 车库门和门禁控制 0是一个ASK/OOK （开关键控）的单晶片射频接收集成电路设备。它是一个真正的“从天线接收到数据输出”的单片电路。所有的射频和中频的调谐都在集成电路里完成，这样可以无须手动调整并且降低成本。实现了一个高度可靠且低成本的解决方案。是一个采用16引脚封装且功能齐全的芯片，A/B/C/DL 采用了8引脚封装，功能稍有减少。 提供了两种附加的功能，（1）一个关闭引脚，在任务周期操作时可以用来关闭设备；（2）一个唤醒输出引脚，当接收到射频信号时，它可以提供一个输出标记。这些特点使得可以用在低功耗的应用上，比如RKE 和远程控制。 上提供了所有的中频滤波和数据解调滤波器，所以，不需要外部的滤波器了。四个解调滤波器的带宽可以由用户从外部控制。 提供了两种工作模式：固定模式（FIX ）和扫描模式（SWP ）。在固 定模式中，用作传统的超外差接收器。在扫描模式下，在一个较宽的射频范围内进行扫描。固定模式提供了更有选择性和针对性的工作模式，并且使得可以与低成本，精确度较低的发射器一起使用。 NK51 0 NK51 0NK51 0NK51 0NK51 0NK51 0NK51 0NK51 0NK51 0NK51 0

降压稳压芯片LSP5502DATASHEET

PIN ASSIGNMENT SS EN COMP FB BS IN SW GND SOP-8L PIN DESCRIPTION Name No. Description BS 1 Bootstrap. This pin acts as the positive rail for the high-side switch’s gate driver. Connect a 0.01uF capacitor between BS and SW. IN 2 Input Supply. Bypass this pin to G with a low ESR capacitor. See Input Capacitor in the Application Information section. SW 3 Switch Output. Connect this pin to the switching end of the inductor. GND 4 Ground. FB 5 Feedback Input. The voltage at this pin is regulated to 0.925V. Connect to the resistor divider between output and ground to set output voltage. COMP 6 Compensation Pin. See Stability Compensation in the Application Information section. EN 7 Enable Input. When higher than 2.5V, this pin turns the IC on. When lower than 1.3V, this pin turns the IC off. Output voltage is discharged when the IC is off. This pin should not be left open. SS 8 Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft-start period. A 0.1μF capacitor sets the soft-start period to 15ms. To disable the soft-start feature, leave SS unconnected. TYPICAL APPLICATION Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Supplies Green Electronics/ Appliances Notebook Computers GENERAL DESCRIPTION The LSP5502 is a monolithic synchronous buck regulator. The device integrates 120m ? MOSFETS that provide 2A continuous load current over a wide operating input voltage of 4.5V to 27V. Current mode control provides fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn on. In shutdown mode, the supply current drops below 1μA. This device, available in an 8-pin SOP package,provides a very compact system solution with minimal reliance on external components. FEATURES 2A Output Current Wide 4.5V to 27V Operating Input Range Integrated 120m ? Power MOSFET Switches Output Adjustable from 0.925V to 24V Up to 96% Efficiency Programmable Soft-Start Stable with Low ESR Ceramic Output Capacitors Fixed 400KHz Frequency Cycle-by-Cycle Over Current Protection Input Under Voltage Lockout 8-Pin SOP Package

UC3863 datasheet 芯片资料

UC1861-1868UC2861-2868UC3861-3868 FEATURES ?Controls Zero Current Switched (ZCS)or Zero Voltage Switched (ZVS)Quasi-Resonant Converters ?Zero-Crossing Terminated One-Shot Timer ?Precision 1%, Soft-Started 5V Reference ?Programmable Restart Delay Following Fault ?Voltage-Controlled Oscillator (VCO) with Programmable Minimum and Maximum Frequencies from 10kHz to 1MHz ?Low Start-Up Current (150μA typical) ?Dual 1 Amp Peak FET Drivers ?UVLO Option for Off-Line or DC/DC Applications DESCRIPTION The UC1861-1868family of ICs is optimized for the control of Zero Current Switched and Zero Voltage Switched quasi-resonant converters.Differ-ences between members of this device family result from the various com-binations of UVLO thresholds and output options.Additionally,the one-shot pulse steering logic is configured to program either on-time for ZCS systems (UC1865-1868),or off-time for ZVS applications (UC1861-1864).The primary control blocks implemented include an error amplifier to com-pensate the overall system loop and to drive a voltage controlled oscillator (VCO),featuring programmable minimum and maximum frequencies.Trig-gered by the VCO,the one-shot generates pulses of a programmed maxi-mum width,which can be modulated by the Zero Detection comparator.This circuit facilitates “true”zero current or voltage switching over various line,load,and temperature changes,and is also able to accommodate the resonant components' initial tolerances. Under-Voltage Lockout is incorporated to facilitate safe starts upon power-up.The supply current during the under-voltage lockout period is typically less than 150μA,and the outputs are actively forced to the low state. (continued)BLOCK DIAGRAM Resonant-Mode Power Supply Controllers Device 18611862186318641865186618671868UVLO 16.5/10.516.5/10.5360143601416.5/10.516.5/10.53601436014Outputs Alternating Parallel Alternating Parallel Alternating Parallel Alternating Parallel “Fixed” Off Time Off Time Off Time Off Time On Time On Time On Time On Time

datasheet阅读

1. 确定阅读目标 为绘制TMS320C6713的最小系统，因此，主要关注核心的硬件，比如供电、复位、时钟以及启动方式配置等。如果不添加相关的外设，则数据手册中有关外设的讲解可以略过。 2. 阅读数据手册首页的关于芯片功能的基本信息 数据手册上的第一页很重要，比如从上面很容易就可以看出6713为浮点DSP，主频、指令速度等。 还有启动的配置方式，封装方式，供电方式，这些是在设计最小系统时都需要考虑的问题。比如我们从中可以看出，6713分别需要3.3V和1.2给IO口和DSP内核供电，因此我们必需设计电源电路能同时产生1.2V和3.3V的稳定供电电压。 3. 熟悉最小系统的构成 TMS320C6713最小系统由7部分组成，

熟悉了最小系统我们就知道电路设计过程中要完成哪些功能呢，在继续阅读数据手册时也知道要关注哪些功能了。 我们要关注电源的设计，功能设置一般包括启动方式配置，下载方式配置，存储器访问方式配置等等，关注复位的方法（高电平复位？低电平复位），关注需要哪几种时钟，是否需要外扩存储器、存储器的映射关系（如果要外扩存储器需要知道映射关系）。JTAG电路一般比较固定，可以在网络上查找近乎固定的电路模式，但不同芯片的JTAG 电路略有不同，注意区分。DSP6713使用14脚的JTAG接口。 4. 快速阅览数据手册 如果这是第一次阅读该数据手册，强烈建议先不要直接大范围地跳着阅读，而应该“阅览”，阅览指快速的往下读，觉得与最小系统设计无关的部分可以直接很快跳过。 阅读时对芯片整体系统的描述最好仔细阅读，比如下面的描写6713处理器特性的表格和功能图（对存在的外设要知道外设是干嘛用的，但不用知道用法），其它相关的内容应该形成一个框架，需要知道大致的位置，需要时再详细阅读。

Datasheet网站,datasheet下载网全面搜罗!

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1 DS8802A-00 May 2006 https://www.sodocs.net/doc/0317706324.html, All brandname or trademark belong to their owner respectively 2/3/4/5-Phase PWM Controller for High-Density Power Supply General Description The RT8802A is a 2/3/4/5-phase synchronous buck controller specifically designed to power Intel ? / AMD next generation microprocessors. It implements an internal 8-bit DAC that is identified by VID code of microprocessor directly. RT8802A generates VID table that conform to Intel ? VRD10.x and VRD11 core power with 6.25mV increments and 0.5%accuracy. RT8802A adopts innovative time-sharing DCR current sensing technique to sense phase currents for phase current balance,load line setting and over current protection. Using a common GM to sense all phase currents eliminates offset and linearity variation between GMs in conventional current sensing methods. As sub-milli-ohm-grade inductors are widely used in modern motherboards, slight offset and linearity mismatch will cause considerable current shift between phases. This technique ensures good current balan ce in ma ss production.Other features include over current protection, programmable soft start, over voltage protection, and output offset setting.RT8802A comes to a small footprint package with VQFN-40L 6x6. Features z 5V Power Supply z 2/3/4/5-Phase Power Conversion with Automatic Phase Selection z 8-bit VID Interface, Supporting Intel VRD11/VRD10.x and AMD K8, K8_M2 CPUs z VR_HOT and VR_FAN Indication z Precision Core Voltage Regulation z Power Stage Thermal Balance by DCR Current Sensing z Adjustable Soft-start z Over-Voltage Protection z Adjustable Frequency and Typical at 300kHz per Phase z Power Good Indication z 40-Lead VQFN Package z RoHS Compliant and 100% Lead (Pb)-Free Applications z Intel ? /AMD New generation microprocessor for Desktop PC and Motherboard z Low Output Voltage, High power density DC-DC Converters z Voltage Regulator Modules Ordering Information Pin Configurations (TOP VIEW) VQFN-40L 6x6 Note : RichTek Pb-free products are : `RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. `Suitable for use in SnPb or Pb-free soldering processes.`100% matte tin (Sn) plating. VTT/EN FBRTN FB SS QRSEL VR_FAN TSEN I O U T D V D R T O F S A D J T C O C I M A X I S N 1 I S N 24 I S N 35 V I D _S E L V I D 0 V I D 1 V I D 2 V I D 3V I D 4 V I D 5 V I D 6 V I D 7V D D P : Pb Free with Commercial Standard RT8802A

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