SN74LS191DR

Counter Dividers Overview

The SN74LS191DR 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 positive-edge triggering and includes an asynchronous reset function. It is housed in a 16-SOIC surface-mount package with a wide operating temperature range from 0°C to 70°C.

Counter Dividers Feature Summary

• Synchronous four-bit binary counting capability with simultaneous up or down direction control via a single clock line.
• Positive-edge triggered flip-flops ensure precise timing synchronization across all stages.
• Asynchronous master reset allows immediate clearing of the counter state independent of the clock signal.

Counter Dividers Applications

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

Counter Dividers Procurement Notes

Verify the specific suffix 'DR' confirms the SOIC-16 surface mount package and tape-and-reel shipping format. Confirm RoHS3 compliance status for environmental regulations. Ensure the 4.75 V to 5.25 V supply requirement matches the target system design constraints before integration.

Counter Dividers Selection Notes

Select this component when a synchronous 4-bit counter with up/down functionality is required in a standard 5V logic environment. The LS series offers higher speed than standard TTL but consumes more power than HC variants. Verify that the 16-SOIC footprint fits the PCB layout and that the 25 MHz maximum frequency meets the application's timing requirements.

Counter Dividers Part Context

This part belongs to the SN54/74LS190/191 family of synchronous counters. It serves as a digital logic building block for sequential circuit designs. The device integrates four D-type flip-flops with decoding logic to manage binary counting operations efficiently within integrated circuits.

Counter Dividers Replacement Considerations

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