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| Item number:
CIEN7-21670679 Manufacturer no.:
SN74LS390N EAN/GTIN:
5053606527360 |
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| Description for the SN74LS390
Each of these monolithic circuits contains eight master-slave flip-flops and additional gating to implement two individual four-bit counters in a single package. The '390 and 'LS390 incorporate dual divide-by-two and divide-by-five counters, which can be used to implement cycle lengths equal to any whole and/or cumulative multiples of 2 and/or 5 up to divide-by-100. When connected as a bi-quinary counter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage. The '393 and 'LS393 each comprise 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 '390, 'LS390, '393, and 'LS393 have parallel outputs from each counter stage so that any submultiple of the input count frequency is available for system-timing signals. Series 54 and Series 54LS circuits are characterized for operation over the full military temperature range of -55°C to 125°C; Series 74 and Series 74LS circuits are characterized for operation from 0°C to 70°C. More information: Weight & dimensions | Width | 21.34 mm | | Depth | 7.62 mm | | Width (with pins) | 21.34 mm | | Height (with pins) | 8.38 mm | | Package depth | 506 mm | | Package width | 13.97 mm | | Package height | 11.23 mm | Features | Type | Decade counter | | Number of pins | 16 | | Operating temperature (T-T) | 0 - 70 °C |
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