74HCT191 counter equivalent, presettable synchronous 4-bit binary up/down counter.
* Synchronous reversible counting
* Asynchronous parallel load
* Count enable control for synchronous expansion
* Single up/down control input
* Outpu.
Fig.6 shows a method of causing state changes to occur simultaneously in all stages. The RC outputs propagate the carry.
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..
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