MM74HC393M

Revised January 2005 MM74HC393 Dual 4-Bit Binary Counter General Description Features 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. ■ Typical operating frequency: 50 MHz 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 configurations. ■ Low quiescent supply current: 80 µA maximum (74HC Series) ■ Typical propagation delay: 13 ns (Ck to QA) ■ Wide operating supply voltage range: 2–6V ■ Low input current: