M74HC390B1R Datasheet

Counter Shift Registers


The M74HC390B1R is a high speed CMOS DUAL DECADE COUNTER fabricated in silicon gateC2MOS technology. It has the same highspeed performance of LSTTL combined with true CMOS low power consumption. This dual decade counter contains two independent ripple carry counters. Each counter is composed of a divide-by-two and divide-by-five counter. The divide-by-two and divide-by-five counters can be cascaded to form dual decade, dual biquinary, or various combinations up to a single divide-by-100 counter. Each 4-bit counter is incremented on the high to low transition (negative edge) of the clock input, and each has an independent clear input. When clear is set low all four bits of each counter are set to low. This enables count truncation and allows the implementation of divide-by-N counter configurations. All inputs are equipped with protection circuits against static discharge and transient excess voltage. M74HC390B1R Features • HIGH SPEED: fMAX = 84 MHz (TYP.) AT VCC =5V• 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 54/74LS390


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