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74HC191 - Presettable synchronous 4-bit binary up/down counter

General Description

The 74HC191 is an asynchronously presettable 4-bit binary up/down counter.

It contains four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation.

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📁 Similar Datasheet

Part Number Description Manufacturer
74HC191 4-BIT SYNCHRONOUS UP/DOWN BINARY COUNTERS Texas Instruments
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The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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74HC191 Presettable synchronous 4-bit binary up/down counter Rev. 3 — 3 January 2017 Product data sheet 1. General description The 74HC191 is an asynchronously presettable 4-bit binary up/down counter. It contains four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation. Asynchronous parallel load capability permits the counter to be preset to any desired value. Information present on the parallel data inputs (D0 to D3) is loaded into the counter and appears on the outputs when the parallel load (PL) input is LOW. This operation overrides the counting function. Counting is inhibited by a HIGH level on the count enable (CE) input.