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SCLS748 – MARCH 2014 SN54HC191-DIE 4-Bit Synchronous Up/Down Binary Counter
1 1 Features Wide Operating Voltage Range
Low Power Consumption
Low Input Current
Single Down/Up Count-Control Line
Look-Ahead Circuitry Enhances Speed of
Cascaded Counters
Fully Synchronous in Count Modes
Asynchronously Presettable With Load Control 2 Description
The SN54HC191-DIE is a 4-bit synchronous,
reversible, up/down binary counter. Synchronous
counting operation is provided by having all flip-flops
clocked simultaneously so that the outputs change
coincident with each other when instructed by the
steering logic. This mode of operation eliminates the
output counting spikes normally associated with
asynchronous (ripple-clock) counters. …