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MM54HC190 Datasheet PDF - National ->Texas Instruments

Part NameDescriptionManufacturer
MM54HC190 Synchronous Decade Up/Down Counters with Mode Control, Synchronous Binary Up/Down Counters with Mode Control National-Semiconductor
National ->Texas Instruments National-Semiconductor
Other PDF  no available.
MM54HC190 Datasheet PDF : MM54HC190 pdf   
MM74HC191 image

General Description
These high speed synchronous counters utilize advanced silicon-gate CMOS technology. They possess the high noise immunity and low power consumption of CMOS technology, along with the speeds of low power Schottky TTL. These circuits are synchronous, reversible, up/down counters. The MM54HC191/MM74HC191 are 4-bit binary counters and the MM54HC190/MM74HC190 are BCD counters.
Synchronous operation is provided by having all flip-flops clocked simultaneously, so that the outputs change simultaneously when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters.
The outputs of the four master-slave flip-flops are triggered on a low-to-high level transition of the clock input, if the enable input is low. A high at the enable input inhibits counting. The direction of the count is determined by the level of the down/up input. When low, the counter counts up and when high, it counts down.

Features
■ Level changes on Enable or Down/Up can be made re gardless of the level of the clock input
■ Wide power supply range: 2–6V
■ Low quiescent supply current: 80 μA maximum  (74HC Series)
■ Low input current: 1 μA maximum

 

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