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
16
1
DIP−16
N SUFFIX
CASE 648
•
•
•
•
•
w
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 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.
V
CC
16
TC
15
Q
0
14
Q
1
13
Q
2
12
Q
3
11
CET
10
PE
9
16
1
SO−16
D SUFFIX
CASE 751B
16
1
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.
1
*R
2
CP
3
P
0
4
P
1
5
P
2
6
P
3
7
CEP
8
GND
DEVICE MARKING INFORMATION
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
MR
SR
P
0
−P
3
PE
Q
0
−Q
3
TC
FUNCTION
Count Enable Parallel Input
Count Enable Trickle Input
Clock Pulse Input
(′161) Asynchronous Master Reset Input
(′163) Synchronous Reset Input
Parallel Data Inputs
Parallel Enable Input
Flip−Flop Outputs
Terminal Count Output
©
Semiconductor Components Industries, LLC, 2006
March, 2006
−
Rev. 7
1
Publication Order Number:
MC74AC161/D
ONSEMI [ ON SEMICONDUCTOR ]
