Product Descriptions

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-quinarycounter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage.

Product Features

Dual Versions of the Popular '90A, 'LS90 and '93A, 'LS93

'390, 'LS390 .. Individual Clocks for A and B Flip-Flops Provide Dual ÷ 2 and ÷ 5 Counters

'393, 'LS393... Dual 4-Bit Binary Counter with Individual Clocks

All Have Direct Clear for Each 4-Bit Counter

Dual 4-Bit Versions Can Significantly Improve System Densities by Reducing Counter Package Count by 50 percent

Typical Maximum Count Frequency ... 35 MHz

Buffered Outputs Reduce Possibility of Collector Commutation

Product Photos

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