| Part number | DM74LS191 |
|---|---|
| Manufacturer | National Semiconductor |
| File Size | 125.07 KB |
| Description | Synchronous 4-Bit Up/Down Counters |
| Datasheet |
 DM74LS191 Datasheet
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| Note |
This datasheet PDF includes multiple part numbers: DM74LS191, DM74LS190. Please refer to the document for exact specifications by model. |
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These circuits are synchronous reversible up down counters The LS191 is a 4-bit binary counter and the LS190 is a BCD counter Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously 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 t
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