HD74ACT161中文资料日立数据手册PDF规格书

描述 Description

The HD74ACT161 and HD74ACT163 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 HD74ACT161 have an asynchronous Master Reset input that overrides all other inputs and forces the outputs Low. The HD74ACT163 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.

特性 Features

• Synchronous Counting and Loading

• High-Speed Synchronous Expansion

• Typical Count Rate of 125 MHz

• Outputs Source/Sink 24 mA

• HD74ACT161 and HD74ACT163 have TTL-Compatible Inputs