74HC191

The 74HC191 is a high-speed synchronous counter from Semiconductor Components, utilizing advanced silicon-gate CMOS technology. It offers the high noise immunity and low power consumption characteristic of CMOS, combined with the speeds of low power Schottky TTL.

This device functions as a 4-bit binary counter that is presettable and reversible, capable of counting both up and down. Synchronous operation is achieved by clocking all flip-flops simultaneously, ensuring that outputs change at the same time, which eliminates output counting spikes. The operating voltage ranges from 2V to 6V, with a typical quiescent current of 8µA and a maximum supply current of 50mA.

Key electrical specifications include a maximum frequency of 13MHz and a propagation delay of 60ns. The counter triggers on the positive edge of the clock signal. It is designed for surface mounting and comes in an SOP package. The operating temperature range is from -40°C to 125°C.

This counter is suitable for various digital logic applications requiring precise counting and control. Its reversible counting capability and synchronous operation make it a versatile component for state machines, frequency division, and other sequential logic circuits.