M54/M74HC190 M54/M74HC191 4 BIT SYNCHRONOUS UP/DOW.
M74HC190 - 4 BIT SYNCHRONOUS UP/DOWN COUNTERS
M54/M74HC190 M54/M74HC191 4 BIT SYNCHRONOUS UP/DOWN COUNTERS . . . . . . . . HIGH SPEED fMAX = 48 MHz (TYP.) AT VCC = 5 V LOW POWER DISSIPATION ICC .MM74HC190 - Synchronous Decade Up/Down Counters
MM54HC190 MM74HC190 MM54HC191 MM74HC191 January 1988 MM54HC190 MM74HC190 Synchronous Decade Up Down Counters with Mode Control MM54HC191 MM74HC191.