Update: 30 September, 2023
The M74HC191 is a high speed CMOS 4-bit synchronous up/down counter fabricated with silicon gate C2MOS technology. State changes of the counter are synchronous with the LOW-to-HIGH transition of the Clock Pulse Input. An asynchronous parallel load input overrides counting and loads the data present on the DATA inputs into the flip-flops, which makes it possible to use the circuits as programmable counters. A count enable input serves as the carry/borrow input in multi-stage counters. Control input, Down/ Up, determines whether a circuit counts up or down. A MAX/MIN output and a Ripple Clock output provide overflow/underflow indication and make possible a variety of methods for generating carry/borrow signals in multi-stage counter applications. All inputs are equipped with protection circuits against static discharge and transient excess voltage.
File format: PDF
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MD5 Checksum: 49A10081B49AF67A319E2BFD0885E105
Publication date: 10 August, 2012
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PDF Link: ST M74HC191 handbook PDF