DM74LS253N

Overview

The DM74LS253N is a 3-STATE Data Selector/Multiplexer manufactured by onsemi, formerly Fairchild Semiconductor. It features two independent four-line-to-one-line sections with common address inputs A and B. The device utilizes Schottky-clamped transistors for high-speed operation and includes separate output control inputs (strobe) for each section. It operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0 °C to +70 °C. The component is housed in a 16-Lead Plastic Dual-In-Line Package (PDIP).

Feature Summary

• Features 3-STATE outputs that interface directly with bus-organized systems.
• Contains inverters and drivers for complementary binary decoding data selection.
• Includes separate strobe/output control inputs for each multiplexer section.

Applications

• Multiplexing from N-lines to one line.
• Parallel-to-serial conversion.
• Bus-organized system data line interfacing.

Procurement Notes

Verify the package type matches the specific suffix; 'N' indicates a 16-Lead PDIP. Confirm RoHS compliance status as original datasheets may predate modern regulations. Check for obsolescence or lifecycle changes, as this part was originally produced by Fairchild Semiconductor before acquisition by onsemi. Ensure the application environment stays within the specified 0 °C to +70 °C temperature range.

Selection Notes

Select this component when a dual 4-to-1 multiplexer with tri-state outputs is required. It serves as a 3-STATE version of the DM74LS153 with identical pinout compatibility. Consider the typical propagation delay of 12 ns for data-to-output paths when designing timing-critical circuits. Verify that the load capacitance requirements align with the switching characteristics provided in the datasheet.

Part Context

This device belongs to the 74LS logic family, characterized by Schottky diode clamping to prevent saturation and improve switching speed. It is functionally similar to the DM74LS153 but offers high-impedance states for bus sharing. The DM74LS253N specifically denotes the through-hole PDIP variant, distinct from the surface-mount SOIC version designated by the 'M' suffix.

Replacement Considerations

Direct substitutes include the DM74LS153N if tri-state outputs are not required, though pinouts differ. Other compatible 74LS series multiplexers should be verified against the electrical characteristics and package dimensions. Cross-reference with Texas Instruments SN74LS253N equivalents for potential sourcing alternatives.