DM74ALS253MX

Overview

The DM74ALS253MX is a 3-STATE Dual 1-of-4 Line Data Selector/Multiplexer manufactured by onsemi. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a free air operating temperature from 0 °C to +70 °C. The device features two independent multiplexer circuits with common address inputs A and B, separate data and output control inputs, and non-inverting outputs. Propagation delay times range from 2 ns to 21 ns depending on the signal path. It is housed in a 16-Lead Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Contains full on-chip decoding to select one-of-four data sources based on a unique two-bit binary code at the Select Inputs.
• Output control circuitry incorporates a power-up 3-STATE feature to prevent bus access conflicts during initialization.
• Select input buffers incorporate internal overlap features to ensure that select input changes do not cause invalid output transients.

Applications

• Data routing in digital systems requiring dual channel selection
• Bus interface applications utilizing 3-STATE outputs
• Logic circuits requiring non-inverting multiplexing

Procurement Notes

Verify component authenticity through authorized distribution channels. Confirm the specific ordering suffix matches the required SOIC package configuration. Review the manufacturer datasheet for absolute maximum ratings and recommended operating conditions prior to integration. Ensure compliance with RoHS directives if applicable to the target assembly process.

Selection Notes

This component is suitable for designs requiring dual 1-of-4 multiplexing with high-speed switching characteristics. It offers pin and functional compatibility with LS family counterparts. Consider the propagation delay specifications when designing timing-critical paths. Verify that the load capacitance requirements align with the guaranteed switching performance across the full temperature and supply voltage range.

Part Context

The DM74ALS253 belongs to the 74ALS logic series, which utilizes an advanced oxide-isolated, ion-implanted Schottky TTL process. This technology provides improved switching performance and reduced power consumption compared to standard TTL families. The device represents a legacy component originally developed by Fairchild Semiconductor, now managed under the onsemi portfolio.

Replacement Considerations

SN74ALS253N Texas Instruments

FAQ

How does the device handle output disable times relative to enable times?

In order to prevent bus access conflicts, the output disable times are shorter than the output enable times.

What is the function of the Output Control inputs?

When at the high level, the Output Control inputs place the corresponding output in the high impedance OFF-State.