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74ACT16X

Synchronous Presettable Binary Counter

ON Semiconductor 

MC74AC161, MC74ACT161,

MC74AC163, MC74ACT163

Synchronous Presettable

Binary Counter

The MC74AC161/74ACT161 and MC74AC163/74ACT163 are

high−speed synchronous modulo−16 binary counters. They are

synchronously presettable for application in programmable dividers

and have two types of Count Enable inputs plus a Terminal Count

output for versatility in forming synchronous multistage counters.

The MC74AC161/74ACT161 has an asynchronous Master Reset

input that overrides all other inputs and forces the outputs LOW. The

MC74AC163/74ACT163 has a Synchronous Reset input that

overrides counting and parallel loading and allows the outputs to be

simultaneously reset on the rising edge of the clock.

• Synchronous Counting and Loading

• High−Speed Synchronous Expansion

• Typical Count Rate of 125 MHz

• Outputs Source/Sink 24 mA

• ′ACT161 and ′ACT163 Have TTL Compatible Inputs

w These devices are available in Pb−free package(s). Specifications herein

apply to both standard and Pb−free devices. Please see our website at

www.onsemi.com for specific Pb−free orderable part numbers, or

contact your local ON Semiconductor sales office or representative.

VCC TC Q0 Q1 Q2 Q3 CET PE

16 15 14 13 12 11 10 9

http://onsemi.com

16

1

16

1

16

1

DIP−16

N SUFFIX

CASE 648

SO−16

D SUFFIX

CASE 751B

EIAJ−16

M SUFFIX

CASE 966

ORDERING INFORMATION

See detailed ordering and shipping information in the package

dimensions section on page 12 of this data sheet.

12345678

*R CP P0 P1 P2 P3 CEP GND

Figure 1. Pinout: 16−Lead Packages Conductors

(Top View)

PIN ASSIGNMENT

PIN

FUNCTION

CEP

Count Enable Parallel Input

CET

Count Enable Trickle Input

CP

Clock Pulse Input

MR

(′161) Asynchronous Master Reset Input

SR

(′163) Synchronous Reset Input

P0−P3

PE

Parallel Data Inputs

Parallel Enable Input

Q0−Q3

TC

Flip−Flop Outputs

Terminal Count Output

© Semiconductor Components Industries, LLC, 2006

1

March, 2006 − Rev. 7

DEVICE MARKING INFORMATION

See general marking information in the device marking

section on page 11 of this data sheet.

Publication Order Number:

MC74AC161/D

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