DESCRIPTION
The M54/74HC190/191 are high speed CMOS4-BIT SYNCHRONOUS UP/DOWN COUNTERS fabricated in silicon gate C2MOS technology.
   
■ HIGH SPEED
    fMAX = 48 MHz (TYP.) AT VCC = 5 V
■ LOW POWER DISSIPATION
    ICC = 4 µA (MAX.) AT TA = 25 °C
■ HIGH NOISE IMMUNITY
    VNIH = VNIL = 28 % VCC (MIN.)
■ OUTPUT DRIVE CAPABILITY
    10 LSTTL LOADS
■ SYMMETRICAL OUTPUT IMPEDANCE
    |IOH| = IOL = 4 mA (MIN.)
■ BALANCED PROPAGATION DELAYS
    tPLH = tPHL
■ WIDE OPERATING VOLTAGE RANGE
    VCC (OPR) = 2 V TO 6 V
■ PIN AND FUNCTION COMPATIBLE
    WITH 54/74LS190/191