The DM74LS393 by National Semiconductor is a Dual 4-Bit Binary Counter. Below is the official datasheet preview.
| Part number | DM74LS393 |
|---|---|
| Manufacturer | National Semiconductor |
| File Size | 99.10 KB |
| Description | Dual 4-Bit Binary Counter |
| Datasheet |
 DM74LS393-NationalSemiconductor.pdf
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Each of these monolithic circuits contains eight masterslave flip-flops and additional gating to implement two individual four-bit counters in a single package The ’LS393 comprises two independent four-bit binary counters each having a clear and a clock input N-bit binary counters can be implemented with each package providing the capability of divide-by-256 The LS393 has parallel outputs from each counter stage so that any submultiple of the input count freqency is available for system-timing s
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