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1

Data sheet acquired from Harris Semiconductor

SCHS123E

Features

•Retriggerable/Resettable Capability

•Trigger and Reset Propagation Delays Independent of

RX, CX

•Triggering from the Leading or Trailing Edge

•Q andQ Buered Outputs Available

•Separate Resets

•Wide Range of Output Pulse Widths

•Schmitt Trigger Input on A andB Inputs

•Retrigger Time is Independent of CX

•Fanout (Over Temperature Range)

-Standard Outputs. . . . . . . . . . . . . . .10 LSTTL Loads

-Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

•Wide Operating Temperature Range . . .-55oC to 125oC

•Balanced Propagation Delay and Transition Times

•Significant Power Reduction Compared to LSTTL

Logic ICs

•HC Types

-2V to 6V Operation

-High Noise Immunity: NIL = 30%, NIH = 30% of VCC

at VCC = 5V

•HCT Types

-4.5V to 5.5V Operation

-Direct LSTTL Input Logic Compatibility,

VIL= 0.8V (Max), VIH = 2V (Min)

-CMOS Input Compatibility, Il≤µ1A at VOL, VOH

Pinout

CD54HC4538, CD54HCT4538

(CERDIP)

CD74HC4538

(PDIP, SOIC, SOP, TSSOP)

CD74HCT4538

(PDIP, SOIC)

TOP VIEW

Description

The’HC4538and’HCT4538aredual

retriggerable/resettablemonostableprecisionmultivibrators

forfixedvoltagetimingapplications.Anexternalresistor

(RX )andanexternalcapacitor(CX )controlthetimingand

theaccuracyforthecircuit.AdjustmentofRXandCX

providesa wide range of output pulsewidths from theQ and

Qterminals.Thepropagationdelayfromtriggerinput-to-

output transitionandthe propagationdelay fromresetinput-

to-output transition are independent of R

X and CX.

Leading-edgetriggering(A)andtrailingedgetriggering(B)

inputsareprovidedfortriggeringfromeitheredgeofthe

inputpulse. Anunused“A”inputshouldbetiedtoGNDand

anunused BshouldbetiedtoVCC .OnpoweruptheICis

reset.Unusedresetsandsectionsmustbeterminated.In

normaloperationthecircuitretriggersontheapplicationof

eachnewtriggerpulse.Tooperateinthenon-triggerable

mode QisconnectedtoBwhenleadingedgetriggering(A)

isusedorQisconnectedtoAwhentrailingedgetriggering

( B)isused.Theperiod()canbecalculatedfrom=(0.7)τ τ

RX, CX; RMIN is 5k. CΩMIN is 0pF.

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

1C

X

1R

X

C

X

1R

1A

1B

1Q

GND

1Q

V

CC

2R

X

C

X

2R

2A

2B

2Q

2Q

2C

X

Ordering Information

PART NUMBER

TEMP. RANGE

(oC)PACKAGE

CD54HC4538F3A-55 to 12516 Ld CERDIP

CD54HCT4538F3A-55 to 12516 Ld CERDIP

CD74HC4538E-55 to 12516 Ld PDIP

CD74HC4538M-55 to 12516 Ld SOIC

CD74HC4538MT-55 to 12516 Ld SOIC

CD74HC4538M96-55 to 12516 Ld SOIC

CD74HC4538NSR-55 to 12516 Ld SOP

CD74HC4538PW-55 to 12516 Ld TSSOP

CD74HC4538PWR-55 to 12516 Ld TSSOP

CD74HC4538PWT-55 to 12516 Ld TSSOP

CD74HCT4538E-55 to 12516 Ld PDIP

CD74HCT4538M-55 to 12516 Ld SOIC

CD74HCT4538MT-55 to 12516 Ld SOIC

CD74HCT4538M96-55 to 12516 Ld SOIC

NOTE:Whenordering,usetheentire partnumber.The suffixes 96

andRdenotetapeandreel.ThesuffixTdenotesasmall-quantity

reel of 250.

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

Copyright © 2003, Texas Instruments Incorporated

CD54HC4538, CD74HC4538,

CD54HCT4538, CD74HCT4538

High-Speed CMOS Logic Dual Retriggerable

Precision Monostable Multivibrator

[ /Title

(CD54

HC453

8,

CD74

HC453

8,

CD74

HCT45

38)

/Sub-

ject

(High

Speed

CMOS

Logic

June 1998 - Revised October 2003

Produktspecifikationer