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74HC191 - 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS

Description

The ’HC191 devices are 4-bit synchronous, reversible, up/down binary counters.

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.

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Full PDF Text Transcription

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SN54HC191, SN74HC191 4ĆBIT SYNCHRONOUS UP/DOWN BINARY COUNTERS D Wide Operating Voltage Range of 2 V to 6 V D Outputs Can Drive Up To 10 LSTTL Loads D Low Power Consumption, 80-µA Max ICC D Typical tpd = 13 ns D ±4-mA Output Drive at 5 V D Low Input Current of 1 µA Max D Single Down/Up Count-Control Line D Look-Ahead Circuitry Enhances Speed of Cascaded Counters D Fully Synchronous in Count Modes D Asynchronously Presettable With Load Control description/ordering information The ’HC191 devices are 4-bit synchronous, reversible, up/down binary counters. 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.
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