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74HC191 Dataheets PDF



Part Number 74HC191
Manufacturers NXP
Logo NXP
Description Presettable synchronous 4-bit binary up/down counter
Datasheet 74HC191 Datasheet74HC191 Datasheet (PDF)

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 da.

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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. When CE is LOW internal state changes are initiated synchronously by the LOW-to-HIGH transition of the clock input. The up/down (U/D) input signal determines the direction of counting as indicated in the function table. The CE input may go LOW when the clock is i.


QX6107M 74HC191 74LVC1G07-Q100


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