SN74ALS191ANSRE4

Counter Dividers Overview

The SN74ALS191ANSRE4 is a synchronous 4-bit reversible up/down binary counter from the Texas Instruments ALS series. It operates on a positive-edge clock transition and supports both up and down counting directions controlled by a dedicated input. The device features asynchronous parallel preset capability via the LOAD control, allowing outputs to be set independently of the clock signal. It includes look-ahead circuitry for cascading applications and buffered inputs to reduce driver loading.

Counter Dividers Feature Summary

• Synchronous operation with simultaneous flip-flop clocking eliminates output counting spikes associated with ripple-clock counters.
• Asynchronously programmable preset function allows data loading to outputs without requiring a clock transition.
• Look-ahead circuitry provides MAX/MIN outputs to enhance speed during cascaded counter configurations.

Counter Dividers Applications

• Cascaded binary counting systems
• Modulo-N frequency dividers
• Digital timing and sequencing circuits

Counter Dividers Procurement Notes

Verify that the RE4 suffix corresponds to the specific lead finish and environmental compliance requirements mandated by your assembly process. Confirm package dimensions against the SOIC drawing in the datasheet to ensure PCB footprint compatibility. Check current product status as legacy variants may have limited availability or obsolescence risks.

Counter Dividers Selection Notes

Select this component when synchronous counting behavior is required to prevent race conditions common in asynchronous designs. The ALS logic family offers higher speed than standard LS counterparts while maintaining compatible pinouts. Ensure the operating temperature range meets the application environment, as the '74' variant is rated for commercial temperatures only.

Counter Dividers Part Context

This part belongs to the SN54/74ALS191A family of synchronous 4-bit reversible counters. The SN74 variant is designed for commercial temperature ranges, distinguishing it from the military-grade SN54 version. It utilizes Advanced Low-Power Schottky technology to balance power consumption with switching speed.

Counter Dividers Replacement Considerations

SN74ALS191ADR