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LS7213中文资料

LS7213中文资料
LS7213中文资料

PROGRAMMABLE DIGITAL DELAY TIMER

August 2001

FEATURES:

? Eight timing ranges ? Four modes ? RC controlled on-chip oscillator ? Power-On-Reset (POR)? Reset input for delay abort ? Complementary outputs

? Delay-in-Progress Indicator output

? LS7213 (DIP), LS7213-S (SOIC) - See Figure 1

APPLICATIONS

Time delay relays for HVAC equipment and industrial controls.DESCRIPTION

The LS7213 is a monolithic CMOS integrated circuit for generating programmable time-delays. The delay is initiated by a logic transi-tion at the Trigger input and the completion of the delay is marked by a change of status at the Out1 and the Out2 outputs. Three in-puts, D1, D2 and D3 select 1-of-8 scale factors, s. The delay, t d is related to s by the expression, t d = s/f rc , where f rc is the frequency at the RC input produced by an internal oscillator. An external re-sistor-capacitor pair connected to the RC pin controls the oscillator frequency. There are four modes of operation selected by inputs A and B. The operating modes are:

On-Delay (OND), Off-Delay (OFD), Dual-Delay (DLD) and One-Shot(OST). These modes are described below:

On-Delay (OND) Mode

A positive transition at the Trigger input starts the on-delay timer. At the end of the delay Out1 switches low and Out2 switches high. A negative transition at the Trigger input immediately aborts any on-delay in progress. If the Trigger input is switched low, Out1 if low will switch high and Out2 if high will switch low without delay. The states of Out2 in the preceding description applies only if Flashen input is low at the time of the Trigger input transition. See the Out2pin section for a complete description.

Off-Delay (OFD) Mode

A negative transition at the Trigger input starts the off-delay timer.At the end of the delay Out1 switches high and Out2 switches low.A positive transition at the Trigger input immediately aborts any off-delay in progress. If the Trigger input is switched high, Out1 if high will switch low and Out2 if low will switch high without delay. The states of Out2 in the preceding description applies only if Flashen input is low at the time of the Trigger input transition. See the Out2pin section for a complete description.

Dual-Delay (DLD) Mode

In Dual-Delay mode, the delay is generated for both positive and negative transitions at the Trigger input. A positive transition at the Trigger input starts the on-delay timer and aborts any off-delay tim-ing in progress. At the end of the delay Out1 switches low and Out2switches high. A negative transition at the Trigger input starts the off-delay timer and aborts any on-delay timing in progress. At the end of the delay Out1 switches high and Out2 switches low. The states of Out2 in the preceding description applies only if Flashen input is low at the time of the Trigger input transition. See the Out2pin section for a complete description.

One-Shot(OST) Mode

A positive transition at the Trigger input causes Out1 to switch low and Out2 to switch high immediately and start the one-shot delay timer. At the end of the delay Out1 switches high and Out2switches low. Thus in effect, a positive transition at the Trigger in-put produces a negative pulse at Out1 and a positive pulse at Out2. The one-shot delay timer is restarted with every positive trigger transition, thus rendering the Out1 and Out2 pulse-widths stretchable to any duration by periodic re-trigger. A negative tran-sition at the Trigger input has no effect. The states of Out2 in the preceding description applies only if Flashen input is low at the time of the Trigger input transition. See the Out2 pin section for a complete description.

INPUTS/OUTPUTS

Following is a description of all the input/output pins and their functions.

Delay Select Inputs: D1, D2, D3 (Pin3, Pin2, Pin1)

The logic states applied to these three inputs enable the user to select a scale factor, s, for generating a delay, t d, fromTrigger in-put to Out1/Out2 outputs according to Table1. The delay is given by the expression: t d = s/f rc ,

where, s is the scale factor, and f rc is the oscillator frequency at the RC input. The sample delays in Table1 are based on an os-cillator frequency, f rc =10kHz. TABLE 1. Delay Selection

D3 D2 D1 s t d (=s/f rc ) 0 0 0 1x103 0.1sec 0 0 1 1x104 1.0sec 0 1 0 1x105 10.0sec 0 1 1 60x103 0.1min 1 0 0 60x104 1.0min 1 0 1 60x105 10.0min 1 1 0 3600x103 0.1hr 1 1 1 3600x104 1.0hr

D1, D2 and D3 inputs have internal pull-down resistors

7213-082101-1

LSI/CSI

LSI Computer Systems, Inc. 1235 Walt Whitman Road, Melville, NY 11747 (631) 271-0400 FAX (631) 271-0405

LS7213

1

23

4567

14

LSI 12111098

LS7213

D2D1

A B FLASHEN

V DD (+V)V SS (-V)

OUT1

OUT2RESET RC CAP TRIGGER

FIGURE 1

PIN ASSIGNMENT

TOP VIEW U L

?

A3800

Mode Select Inputs: A, B (Pin 5, Pin 6)

The four operating modes are selected by inputs A and B according to Table 2.

TABLE 2. Mode Selection

A B Mode

0 0 On-Delay (OND)

0 1 Off-Delay (OFD)

1 0 Dual-Delay (DLD)

1 1 One-Shot (OST)

Inputs A and B have internal pull-down resistors.

Driver Outputs: Out1, Out2 (Pin 13, Pin 12)

Out1 is an output for driving DC loads requiring high current sink, such as relays, power transistors, etc. In steady-state condition Out1, with the exception of one-shot mode, is always inverse in polarity with respect to the Trigger input. Depending on the oper-ating mode, the steady-state condition is reached immediately or after a specified delay following a change of state at the Trigger input. In one-shot mode, Out1 is always at logic high in the steady state, independent of the logic state of the Trigger input. Out2 operates in two different modes depending on the state of the Flashen input.

If Flashen is at logic low then:

Out2 operates exactly as Out1 but with inverse polarity. In this mode, Out2 is an output for driving DC loads requiring high cur-rent source, such as relays, power transistors, etc. In steady-state condition Out2, with the exception of one-shot mode, is al-ways at the same polarity as the Trigger input. Depending on the operating mode, the steady-state condition is reached immedi-ately or after a specified delay following a change of state at the Trigger input. In one-shot mode Out2 is always at logic low in the steady state, independent of the logic state of the Trigger input. If Flashen is at logic high then:

Out2 operates as a delay-in-progress indicator by generating pe-riodic positive pulses during a delay timing. The pulse-rate, f pf and the pulse-width t pf at Out2 is controlled by an internal os-cillator whose frequency, f cf, is set by a capacitor connected to the Cap input. f pf and f cf are related by the following expres-sions:

f pf=20/f cf,

for scale factors 1x103 and 1x104 and

f pf=100/f cf,

for all other scale factors.

The pulse-width, t pf for both pulse-rates is given by:

t pf =2/f cf

At the end of timeout, Out2 returns to logic low with the cessation of pulses.

Timer Start Input: Trigger (Pin 8)

Any logic transition at the Trigger input, positive or negative caus-es the outputs Out1 and Out2 to switch with or without delay, de-pending on the operating mode.

Any transition of the Trigger input also causes the logic states of the following inputs to be strobed into internal latches: A, B, D1, D2, D3 and Flashen. This prevents any changes at any of these inputs from disrupting the timer when a timeout is in progress. See the description of modes on Page1 and Out1, Out2 section on Page 2 for a complete description of the Trigger input. TheTrigger input has an internal pull-down resistor.Flash Enable Input: Flashen (Pin 4)

The Flashen input modifies the operation of Out2 to function in one of two modes.

When Flashen=0, Out2 functions exactly as Out1 but with inverse polarity from Out1. When Flashen=1, Out2 functions as a flashing delay-in-progress indicator. In this mode periodic positive pulses are generated at Out2 during a delay timing which can be used to produce a flashing LED display for user feedback. For a com-plete description see Out2 section on Page 2. The Fashen input has an internal pull-down resistor.

Master Clear Input: Reset (Pin 11)

When Reset is brought to logic high, all timing functions are aborted, the timer is cleared, Out1 is forced high and Out2 is forced low. Switching the Reset input low causes the mode select inputs, the delay select inputs, the Flashen input and the Trigger input to be sampled by internal logic. Following this, any in-consistencies between the Trigger input and the Out1 and Out2 outputs are resolved and the steady state is reached with or with-out delay based on the status of the mode select inputs. For ex-ample, if the Trigger input is high, the Flashen input is low and the mode is off-delay when the Reset input is switched from high to low, Out1 and Out2 will immediately be switched low and high, respectively, from its forced reset condition. In this example if the mode is on-delay instead of off-delay, then Out1 and Out2 will be switched after the completion of the programmed delay t d.

It should be noted here that the states of Out1 and Out2 in the reset condition and One-Shot mode steady state condition are the same namely, Out1 = 1 and Out2 = 0. Because of this, in

one-shot mode, no change in Out1 and Out2 takes place when the Reset input is switched low, irrespective of the status of the Trigger input. The Reset input has an internal pull-down resistor. NOTE: A POR circuit (See Fig. 2) generates a reset upon power up that produces the same conditions described for Reset (Pin 11).

Timer Oscillator Input: RC (Pin 10)

A resistor-capacitor pair connected to the RC input serves as the basic timing element for the delay timer oscillator.

The oscillator frequency is given by the expression:

f rc=1/0.9RC,

where R and C are the resistor and the capacitor values at the RC input.

The delay, t d, is given by the expression:

t d=s/f rc,

where s is the scale factor selected by inputs D1, D2 and D3. Flash Oscillator Input: Cap (Pin 9)

A capacitor, C, connected from the Cap input to ground regulates an internal flash oscillator frequency according to the relation:

f cf=(k/C)x10-6

where k is a V DD dependent constant ranging in value between 2.1 at V DD=3V to 4.8 at V DD=5V. The flash oscillator frequency controls the pulse-rate, f pf and the pulse width, t pf at Out2 in flash mode according to the following relationships:

f pf=20/f cf,

for scale factors 1x103 and 1x104 and

f pf=100/f cf,

for all other scale factors; and for the pulse-width,

t pf=2/f cf, for all scale factors.

Power Supplies V DD, Vss (Pin 14, Pin 7)

V DD is the power supply positive terminal and Vss is the negative or ground terminal.

7213-082101-2

ABSOLUTE MAXIMUM RATINGS:(All voltages referenced to V SS )SYMBOL

VALUE

UNIT DC Supply Voltage V DD +7

V Voltage (Any Pin)

V IN V SS - 0.3 to V DD + 0.3

V Operating Temperature T A -20 to +85°C Storage Temperature

T STG

-65 to +150

°C 7213-082101-3

Characteristic SYMBOL

V DD Unit Condition Min Max Min Max Min Max Supply Voltage V DD - 3.0 5.5 3.0 5.5 3.0 5.5V -3-75

-65

-50

μA Supply Current I DD

4-125

-100

-85

μA with oscillators off

5-190-150-140μA Input Voltages:3 1.6- 1.6 2.0 1.6-V Trigger High V TH 4 2.0- 2.0 2.6 2.0-V -5 2.7- 2.7 3.3 2.7-V 30.8-0.8 1.20.8-V Trigger Low V TL

4 1.2- 1.2 1.8 1.2-V -

5 1.5- 1.5 2.1 1.5-V 3--0.4 1.2--V Trigger Hysteresis 4--0.5 1.4--V -5--0.5 1.8--V 3 1.5- 1.5- 1.5-V All other inputs, High V IH 4 1.9- 1.9- 1.9-V -5 2.4- 2.4- 2.4-V -- 1.0- 1.0- 1.0V All other inputs, Low V IL -- 1.3- 1.3- 1.3V --- 1.6- 1.6- 1.6V Input Currents:All inputs, Low I IL --5-5-10nA Input at V SS 30.9 2.50.8 2.00.5 1.6μA All inputs, High I IH

4 3.

5 6.0 3.0 5.0 2.0 4.0μA Input at V DD

58.012.07.010.0 5.08.0μA Output Current:312.0-10.0-7.0-mA OUT1 Sink I O1L 414.0-12.0-9.0-mA V O1 = +0.5V 518.0-15.0-10.0-mA 3 1.8- 1.5- 1.0-mA OUT1 Source I O1H 4 3.0- 2.5- 1.6-mA V O1 = V DD - 0.5V 5 3.5- 3.0- 2.0-mA 3 5.4- 4.5- 3.0-mA OUT2 Sink I O2L 47.8- 6.5- 4.5-mA V O2 = +0.5V 59.0-7.5- 5.5-mA 39.0-8.0- 6.0-mA OUT2 Source I O2H

413.0-11.0-8.0-mA V O2 = V DD - 0.5V

5

15.0-13.0-9.0-mA RC Oscillator: Frequency f rc - 6.0- 5.0- 4.0MHz -Resistor R

3 6.8k 10M 8.2k 10M 10.0k 10M ?-

4 4.7k 10M 5.6k 10M 6.8k 10M ?-

5 3.9k 10M

4.7k 10M

5.6k 10M

?-Capacitor C

-

no limit

no limit

no limit

μF

-

Flash Oscillator:Capacitor C -no limit no limit no limit μF -Constant K

3 2.1 2.5 2.1 2.5 2.1 2.5--

4 3.2 3.2 3.2 3.7 3.2 3.7--

5

4.3

4.8

4.3

4.8

4.3

4.8

-

-

-20°C +25°C +85°C ELECTRICAL CHARACTERISTICS (Voltages referenced to Vss unless specified otherwise)The information included herein is believed to be accurate and reliable.

LSI Computer Systems, Inc. assumes no responsibilities for inaccuracies, nor for any infringements of patent rights of others which may result from its use.

7213-090100-4

D3

D2D1A TRIGGER

B

FLASHEN DD

Vss

C

OUT1(OND)RESET TRIG

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