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HD74LS190

Part Number	HD74LS190
Manufacturer	Renesas
Description	Synchronous Up / Down Decade Counter
Published	Dec 4, 2017
Detailed Description	HD74LS190 Synchronous Up / Down Decade Counter (signal clock line) REJ03D0452–0200 Rev.2.00 Jul.15.2005 Synchronous ope...
Datasheet	HD74LS190 PDF File

Overview

HD74LS190 Synchronous Up / Down Decade Counter (signal clock line) REJ03D0452–0200 Rev.
2.
00 Jul.
15.
2005 Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by 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 low.
A high at the enable input inhibits counting.
Level changes at the enable input should be made only when the clock input is high.
The direction of th...

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