SN74LS684DWR

Overview

The SN74LS684DWR is an octal binary or BCD magnitude comparator manufactured by Texas Instruments. It operates within a supply voltage range of 4.85 V to 5.25 V and features active low outputs. The device supports a maximum propagation delay of 30 ns and functions across an operating temperature range of 0°C to 70°C. Packaged in a 20-pin SOIC (DW) format, it draws a maximum supply current of 19 mA. This component is designed for digital logic applications requiring precise magnitude comparison.

Feature Summary

• Octal binary or BCD magnitude comparison capability
• Active low output configuration
• Standard 74LS series logic performance

Applications

• Digital data processing systems
• BCD code conversion circuits
• Magnitude decision logic in control systems

Procurement Notes

Verify the specific ordering suffix DWR corresponds to the large tape-and-reel packaging variant when sourcing. Confirm that the active low output polarity matches system requirements. Ensure the 20-pin SOIC footprint aligns with PCB layout constraints. Validate that the 4.85 V to 5.25 V supply range is compatible with existing power rails. Check for lead-free compliance if environmental regulations apply.

Selection Notes

Select this component for applications requiring octal magnitude comparison with standard TTL-compatible inputs. Consider the 30 ns propagation delay for timing-sensitive designs. The active low outputs may simplify logic inversion in certain circuit topologies. Evaluate the 20-pin SOIC package size against available board space. Ensure the 74LS series speed and power characteristics fit the overall system design goals.

Part Context

This part belongs to the Texas Instruments 74LS family of logic comparators. It provides eight-bit comparison functionality within a single integrated circuit. The device is suitable for general-purpose digital logic applications where binary or BCD magnitude determination is required. It complements other components in the 74LS series for complex digital system construction.

Replacement Considerations

Direct substitutes include the SN74LS684N for through-hole mounting. Verify pinout compatibility before replacing surface-mount variants with DIP packages. Cross-reference with other 74LS magnitude comparators if pin configurations differ.