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MC74HC393A - Dual 4-Stage Binary Ripple Counter

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MOTOROLA SEMICONDUCTOR TECHNICAL DATA Product Preview Dual 4-Stage Binary Ripple Counter High–Performance Silicon–Gate CMOS The MC54/74HC393A is identical in pinout to the LS393. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LSTTL outputs. This device consists of two independent 4–bit binary ripple counters with parallel outputs from each counter stage. A ÷ 256 counter can be obtained by cascading the two binary counters. Internal flip–flops are triggered by high–to–low transitions of the clock input. Reset for the counters is asynchronous and active–high. State changes of the Q outputs do not occur simultaneously because of internal ripple delays.
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