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74HC191 Datasheet 4-bit Synchronous Up/down Counters

Manufacturer: STMicroelectronics

Overview: M54/M74HC190 M54/M74HC191 4 BIT SYNCHRONOUS UP/DOWN COUNTERS . 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 .

This datasheet includes multiple variants, all published together in a single manufacturer document.

General Description

The M54/74HC190/191 are high speed CMOS 4-BIT SYNCHRONOUS UP/DOWN COUNTERS fabricated in silicon gate C2MOS technology.

They have the same high speed performance of LSTTL combined with true CMOS low power consumption.

State changes of the counter are synchronous with the LOW-to-HIGH transition of the Clock Pulse input.

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