SN74LS191D

Counter Dividers Overview

The SN74LS191D is a synchronous 4-bit up/down binary counter manufactured by Texas Instruments. It operates within a supply voltage range of 4.75 V to 5.25 V and supports a counting rate of 25 MHz. The device features an asynchronous master reset, synchronous parallel load capability, and dual clock inputs for independent up or down counting operations. Designed for surface-mount applications, it is housed in a 16-pin SOIC package with a wide operating temperature range from 0°C to 70°C.

Counter Dividers Feature Summary

• Synchronous four-bit binary counting architecture supporting both increment and decrement operations via dedicated clock inputs.
• Asynchronous master reset function that forces all outputs to a low state regardless of other input conditions.
• Synchronous parallel load feature allowing data entry into the counter on the rising edge of the appropriate clock pulse.

Counter Dividers Applications

• Digital frequency division circuits
• Programmable timing sequences
• Event counting systems

Counter Dividers Procurement Notes

Verify the specific suffix against the manufacturer datasheet to confirm package type and temperature rating. Ensure the component matches the required logic family specifications for your circuit design. Confirm RoHS compliance status if environmental regulations apply to your manufacturing process.

Counter Dividers Selection Notes

Select this component when a synchronous bidirectional counter is required for digital logic designs. It is suitable for applications needing precise count control with parallel loading capabilities. Consider the 25 MHz maximum counting rate and standard TTL voltage levels when integrating with other system components.

Counter Dividers Part Context

This part belongs to the SN74LS191 series of synchronous up/down counters. It is distinct from the HC and ALS variants regarding speed and power consumption characteristics. The device provides a standard interface for binary counting tasks within industrial and consumer electronic equipment.

Counter Dividers Replacement Considerations

SN74LS169BD is listed as a parameter-equivalent substitute by the distributor.