MC74AC161_15 Datasheet, PDF (1/12 Pages) ON Semiconductor – Synchronous Presettable Binary Counter

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.
Features
• 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
V_CC TC Q₀ Q₁ Q₂ Q₃ CET PE
16 15 14 13 12 11 10 9
www.onsemi.com
16
1
xxx
y
A
WL
Y
WW
G
MARKING
DIAGRAM
16
SOIC−16
D SUFFIX
CASE 751B
1
xxx16yG
AWLYWW
= 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.
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, 2015
1
January, 2015 − Rev. 8
Publication Order Number:
MC74AC161/D