Motorola MC74AC160 MC74ACT160 MC74AC162 MC74ACT162 Data Manual
Summary
This documentation details high-speed synchronous decade counter integrated circuits (MC74AC160), essential for building programmable dividers and complex sequential logic systems. These components count modulo-10 in the BCD sequence and feature versatile control inputs, including asynchronous/synchronous reset and parallel loading, making them ideal for multistage counter designs. The manual provides a comprehensive guide covering operational modes, pin configurations, truth tables, and precise functional equations for electrical engineers and embedded developers working on advanced counting applications.
Page 1 Text Content
查询MC74AC160供应商
SYNCHRONOUS PRESETTABLE BCD DECADE COUNTER
The MC74AC160/74ACT160 and MC74AC162/74ACT162 are high-speed synchronous decade counters operating in the BCD (8421) sequence. 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 MC74AC160/74ACT160 has an asynchronous Master Reset input that overrides all other inputs and forces the outputs LOW. The MC74AC162/74ACT162 has a Synchronous Reset input that overrides counting and parallel loading and allows all outputs to be simultaneously reset on the rising edge of the clock.
N SUFFIX
Synchronous Counting and Loading
CASE 648-08
High-Speed Synchronous Expansion
PLASTIC
Typical Count Rate of 120 MHz Outputs Source/Sink 24 m A ′ACT160 and ′ACT162 Have TTL Compatible Inputs
VCC TC Q0 Q1 Q2 Q3 CET PE
D SUFFIX CASE 751B-05 PLASTIC
LOGIC SYMBOL
*R P0CP P1 P2 P3 CEP GND
PE P0 P1 P2 P3
PIN NAMES
CEP CET TC
CEP Count Enable Parallel Input
CET Count Enable Trickle Input CP CP Clock Pulse Input *R Q0 Q1 Q2 Q3
MR (′160) Asynchronous Master Reset Input SR (′162) Synchronous Reset Input P0–P3 Parallel Data Inputs
*MR for ′160
PE Parallel Enable Input
*SR for ′162
Q0–Q3 Flip-Flop Outputs TC Terminal Count Output
FACT DATA 5-1
Page Summary Contents For Motorola MC74AC160 MC74ACT160 MC74AC162 MC74ACT162 Data Manual
Manual Details
| Brand | Motorola |
|---|---|
| Pages | 14 |
| File Size | 326.99 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
What is the core function of the MC74AC160/MC74AC162?
They are high-speed synchronous decade counters operating in the BCD (8421) sequence, counting modulo-10.
How do I reset the counter using this device?
The '160 model uses an Asynchronous Master Reset (MR), while the '162 uses a Synchronous Reset (SR).
What controls synchronous counting and loading?
Counting requires both the Count Enable ($ ext{CEP}$) and Count Enable Trickle ($ ext{CET}$) inputs to be HIGH. Parallel loading is controlled by $ ext{PE}$.
Can the Terminal Count ($ ext{TC}$) output be used as a clock or reset signal?
No, the $ ext{TC}$ output is not recommended for use as a clock or asynchronous reset because it is subject to spikes.