DM74ALS251MX

Overview

The DM74ALS251MX is a 3-state 1-of-8 line data selector/multiplexer manufactured by onsemi. It features full on-chip decoding to select one of eight data sources based on a three-bit binary code at the Select inputs. The device provides two complementary outputs for both inverting and non-inverting buffer operation. An Output Control input places both outputs in a high impedance OFF-State when high. It operates within a supply voltage range of 4.5 V to 5.5 V, with propagation delays ranging from 2 ns to 24 ns depending on the signal path.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process
• Switching performance guaranteed over full temperature and VCC supply range
• Pin and functional compatible with LS family counterpart
• Output control circuitry incorporates power-up 3-STATE feature

Applications

• Data routing in digital systems
• Signal selection in multiplexed architectures
• Bus interface applications requiring tri-state outputs

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package type M16A (SOIC) matches design requirements. Check RoHS compliance status as indicated in official documentation. Ensure storage conditions adhere to specified limits to maintain device integrity prior to assembly.

Selection Notes

Select this component for designs requiring 8-channel data selection with complementary outputs. Verify that the 4.5 V to 5.5 V operating voltage aligns with system power rails. Consider the 16-lead SOIC package dimensions for PCB layout constraints. Evaluate propagation delay specifications against timing requirements for critical paths.

Part Context

This device belongs to the 74ALS logic family, known for advanced low-power Schottky technology. It serves as a digital multiplexer providing high-speed switching capabilities. The part is functionally equivalent to other industry-standard 1-of-8 multiplexers but offers specific performance characteristics defined by the ALS series guidelines.

Replacement Considerations

DM74ALS251M

FAQ

What is the function of the Output Control input?

When the Output Control input is at a high level, it places both the Y and W outputs into a high impedance OFF-State.

How does the device handle invalid output transients during select input changes?

The Select input buffers incorporate internal overlap features to ensure that select input changes do not cause invalid output transients.