© Semiconductor Components Industries, LLC, 2001

April, 2001 – Rev. 8

1

Publication Order Number:

MC74HC4538A/D

MC74HC4538A

Dual Precision Monostable

Multivibrator (Retriggerable,

Resettable)

The MC74HC4538A is identical in pinout to the MC14538B. The

device inputs are compatible with standard CMOS outputs; with

pullup resistors, they are compatible with LSTTL outputs.

This dual monostable multivibrator may be triggered by either the

positive or the negative edge of an input pulse, and produces a

precision output pulse over a wide range of pulse widths. Because the

device has conditioned trigger inputs, there are no trigger–input rise

and fall time restrictions. The output pulse width is determined by the

function which forces the Q output low and the Q output high,

regardless of the state of the output pulse circuitry.

the Same Test Jig)

No. 7A

Figure 1. Pin Assignment

13

14

15

16

9

10

11

12

5

4

3

2

1

8

7

6

A2

RESET 2

GND

Q2

Q2

B2

A1

RESET 1

GND

GND

Q1

Q1

B1

MC74HC4538ADR2

SO–16

D SUFFIX

CASE 751B

http://onsemi.com

1

16

PDIP–16

N SUFFIX

CASE 648

1

16

MARKING

DIAGRAMS

1

16

MC74HC4538AN

AWLYYWW

1

16

HC4538A

AWLYWW

A

= Assembly Location

L, WL

= Wafer Lot

Y, YY

= Year

W, WW

= Work Week

Device

Package

Shipping

ORDERING INFORMATION

MC74HC4538AN

PDIP–16

2000/Box

MC74HC4538AD

SOIC–16

48/Rail

SOIC–16

2500/Reel

TSSOP–16

DT SUFFIX

CASE 948F

1

16

HC

4538A

ALYW

1

16

MC74HC4538ADT

TSSOP–16

96/Rail

MC74HC4538ADTR2

TSSOP–16

2500/Reel