DESCRIPTION

· The 74HC191 is a presettable 4-bit binary up/down counter with asynchronous parallel load capability.

· It features four master/slave flip-flops with internal gating for synchronous counting and asynchronous preset operations.

· The counter direction is controlled by the up/down (U/D) input, and counting is enabled by the count enable (CE) input.

· It includes terminal count (TC) and ripple clock (RC) outputs for overflow/underflow indications.

FEATURES

· Wide supply voltage range from 2.0 to 6.0 V.

· CMOS technology ensures low power dissipation and high noise immunity.

· Latch-up performance exceeds 100 mA per JESD 78 Class II Level B.

· Synchronous reversible counting with a single up/down control input.

· Asynchronous parallel load and count enable control for synchronous expansion.

APPLICATIONS

· Suitable for use in multistage counter configurations.

· Ideal for applications requiring precise counting and preset operations.

· Used in systems where synchronous and reversible counting is necessary.

· Effective in designs needing overflow/underflow detection and control.