74HCT191 Datasheet PDF

●GENERAL DESCRIPTION

●The 74HC/HCT191 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

●The 74HC/HCT191 are asynchronously presettable 4-bit binary up/down counters. They contain four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation.

●FEATURES

●• Synchronous reversible counting

●• Asynchronous parallel load

●• Count enable control for synchronous expansion

●• Single up/down control input

●• Output capability: standard

●• ICC category: MSI