SN74LS191DE4

Counter Dividers Overview

The SN74LS191DE4 is a synchronous 4-bit binary up/down counter manufactured by Texas Instruments. It operates within a supply voltage range of 4.75 V to 5.25 V and supports a maximum counting rate of 25 MHz. The device features positive-edge triggered flip-flops and allows for bidirectional counting (up or down) controlled by separate clock inputs. It includes asynchronous master reset and synchronous parallel load capabilities. The component is housed in a 16-SOIC surface-mount package with an operating temperature range of 0°C to 70°C.

Counter Dividers Feature Summary

• Synchronous four-bit binary counting architecture supporting both up and down directions
• Asynchronous master reset function for immediate output clearing
• Synchronous parallel load capability for direct data entry into the counter
• Dual clock input configuration for independent control of count direction

Counter Dividers Applications

• Digital frequency division circuits
• Position control systems requiring bidirectional tracking
• Timing sequence generation logic
• Event counting applications

Counter Dividers Procurement Notes

Verify that the SN74LS191DE4 is no longer in production, as indicated by manufacturer end-of-life notices. Confirm availability of recommended substitutes such as the SN74LS191D or SN74LS191DR from Texas Instruments. Ensure compliance with RoHS3 specifications and check for any specific handling requirements related to the obsolete status before finalizing procurement plans.

Counter Dividers Selection Notes

Select this component when a synchronous 4-bit binary counter with bidirectional capability is required. The LS series offers standard TTL compatibility and moderate speed suitable for general-purpose digital logic. Consider the 16-SOIC package for surface-mount assembly needs. Verify that the 25 MHz maximum counting rate meets the system timing requirements and that the 4.75 V to 5.25 V supply range aligns with the design power rails.

Counter Dividers Part Context

The SN74LS191DE4 belongs to the Texas Instruments 74LS family of logic integrated circuits. It is part of the broader 74LS19x series, which includes various counters and shift registers. This specific variant is the lead-free version of the SN74LS191DE, adhering to environmental standards. It serves as a fundamental building block in digital electronics for sequential logic operations.

Counter Dividers Replacement Considerations

The SN74LS191D and SN74LS191DR are listed as manufacturer-recommended alternatives. These parts share the same logical functionality but may differ in packaging or manufacturing lot details. Verify pin compatibility and electrical characteristics before substitution.