Datasheet Summary
DATA SHEET .onsemi.
Dual 4-Stage Binary Ripple Counter with 2 and 5 Sections
High- Performance Silicon- Gate CMOS
The MC74HC390A is identical in pinout to the LS390. The device inputs are patible with standard CMOS outputs; with pullup resistors, they are patible with LSTTL outputs.
This device consists of two independent 4- bit counters, each posed of a divide- by- two and a divide- by- five section. The divide- by- two and divide- by- five counters have separate clock inputs, and can be cascaded to implement various binations of 2 and/or 5 up to a 100 counter.
Flip- flops internal to the counters are triggered by high- to- low transitions of the clock input. A...
