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MC74AC161DR2 Datasheet PDF : 16 Pages
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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
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
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
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 11 of this data sheet.
© Semiconductor Components Industries, LLC, 2002
1
August, 2002 – Rev. 6
Publication Order Number:
MC74AC161/D
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