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HD74LS191

Renesas
Part Number HD74LS191
Manufacturer Renesas
Description Synchronous Up / Down 4-bit Binary Counter
Published Dec 4, 2017
Detailed Description HD74LS191 Synchronous Up / Down 4-bit Binary Counter (single clock line) REJ03D0453–0200 Rev.2.00 Feb.18.2005 Synchrono...
Datasheet PDF File HD74LS191 PDF File

HD74LS191
HD74LS191

Overview
HD74LS191 Synchronous Up / Down 4-bit Binary Counter (single clock line) REJ03D0453–0200 Rev.
2.
00 Feb.
18.
2005 Synchronous operation is provided by having all flip-flops clocked simultaneously so that the steering logic.
This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters.
The outputs of the four master-slave flip-flops are triggered on a low-to-high-level transition of the clock input if the enable input is high.
The direction of the count is determined by the level of the down / up input.
When low, the counter counts up and when high, it counts down.
Level changes at the down / up input should be made only when the cloc...


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