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74LS390 Datasheet Dual 4-Bit Decade Counter

Manufacturer: Fairchild (now onsemi)

Overview: DM74LS390 Dual 4-Bit Decade Counter August 1986 Revised March 2000 DM74LS390 Dual 4-Bit Decade.

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General Description

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 DM74LS390 incorporates dual divide-by-two and divideby-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.

Key Features

  • s Dual version of the popular DM74LS90 s DM74LS390individual clocks for A and B flip-flops provide dual ÷ 2 and ÷ 5 counters s Direct clear for each 4-bit counter s Dual 4-bit version can significantly improve system densities by reducing counter package count by 50% s Typical maximum count frequency35 MHz s Buffered outputs reduce possibility of collector commutation Ordering Code: Order Number DM74LS390M DM74LS390N Package Number M16A N16E Package.

More Datasheets from Fairchild (now onsemi)

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74LS38 Quad 2-Input NAND Buffer
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