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.
http://onsemi.com
DIP−16
N SUFFIX
CASE 648
16
1
• 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.
SO−16
D SUFFIX
CASE 751B
16
1
1
EIAJ−16
M SUFFIX
CASE 966
16
V
TC
15
Q
Q
Q
Q
3
CET PE
10 9
CC
0
1
2
16
14
13
12
11
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
1
2
3
4
5
6
7
CEP GND
8
DEVICE MARKING INFORMATION
*R
CP
P
0
P
1
P
2
P
3
See general marking information in the device marking
section on page 11 of this data sheet.
Figure 1. Pinout: 16−Lead Packages Conductors
(Top View)
PIN ASSIGNMENT
PIN
CEP
CET
CP
FUNCTION
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
MR
SR
(′161) Asynchronous Master Reset Input
(′163) Synchronous Reset Input
Parallel Data Inputs
P −P
0
3
PE
Parallel Enable Input
Q −Q
0
Flip−Flop Outputs
3
TC
Terminal Count Output
© Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
March, 2006 − Rev. 7
MC74AC161/D