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
These are Pb−Free Devices
VCC
TC
Q0
Q1
Q2
Q3
CET
15
14
13
12
11
10
16
SOIC−16
D SUFFIX
CASE 751B
16
1
xxx16yG
AWLYWW
1
= AC or ACT
= 1 or 3
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
PE
16
MARKING
DIAGRAM
xxx
y
A
WL
Y
WW
G
Features
•
•
•
•
•
•
www.onsemi.com
9
1
2
3
4
5
6
7
8
*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
Parallel Data Inputs
PE
Parallel Enable Input
Q0 −Q3
Flip−Flop Outputs
TC
Terminal Count Output
© Semiconductor Components Industries, LLC, 2015
January, 2015 − Rev. 8
1
Publication Order Number:
MC74AC161/D