General Description

The MM74C925, MM74C926, MM74C927 and MM74C928 CMOS counters consist of a 4-digit counter, an internal output latch, NPN output sourcing drivers for a 7-segment display, and an internal multiplexing circuitry with four multiplexing outputs. The multiplexing circuit has its own free-running oscillator, and requires no external clock. The counters advance on negative edge of clock.

Features

■ Wide supply voltage range: 3V to 6V

■ Guaranteed noise margin: 1V

■ High noise immunity: 0.45 VCC (typ.)

■ High segment sourcing current: 40 mA @ VCC − 1.6V, VCC = 5V

■ Internal multiplexing circuitry