MM74HC393 Dual 4-Bit Binary Counter September 1983 Revised February 1999 MM74HC393 Dual 4-Bit Binary Counter General Description The MM74HC393 counter circuits contain independent ripple carry counters and utilize advanced silicon-gate CMOS technology.
The MM74HC393 contains two 4-bit ripple carry binary counters, which can be cascaded to create a single divide-by-256 counter.
Each of the two 4-bit counters is incremented on the HIGHto-LOW transition (negative edge) of the clock input, and each has an independent clear input.
When clear is set HIGH all four bits of each counter are set to a low level.
This enables count truncation and allows the implementation of divide-by-N counter config...

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