DM74ALS157MX

Overview

The DM74ALS157MX is a quad 2-line to 1-line data selector/multiplexer manufactured by Fairchild Semiconductor. It belongs to the Advanced Low-power Schottky (ALS) logic family and operates within a supply voltage range of 4.5 V to 5.5 V. The device features buffered inputs and outputs, ensuring full on-chip data selection for four output gates. It utilizes a 16-lead Small Outline Integrated Circuit (SOIC) package with a JEDEC MS-012 standard footprint. Typical propagation delay is 9 ns, with typical power dissipation at 49 mW.

Feature Summary

• Contains inverters and drivers to supply full on-chip data selection to four output gates
• Features buffered inputs and outputs for signal integrity
• Includes a separate strobe input for control
• Selects a 4-bit word from one of two sources and routes it to the four outputs

Applications

• Routing 4-bit words from multiple sources to common outputs
• Data selection in microprocessor systems
• Multiplexing applications requiring buffered I/O

Procurement Notes

Verify the manufacturer origin, as the DM74ALS157MX designation may be produced by Fairchild Semiconductor or licensed partners such as Rochester Electronics. Confirm the specific suffix 'MX' corresponds to the SOIC-16 surface mount package. Ensure the component meets the required ALS series specifications regarding propagation delay and power dissipation for your circuit design.

Selection Notes

Select this component when a quad multiplexer with buffered I/O is required. The ALS series offers improved switching speed compared to standard LS logic while maintaining low power consumption. Verify that the 4.5 V to 5.5 V operating voltage range aligns with your system's power supply. The 16-lead SOIC package is suitable for surface mount assembly processes.

Part Context

This part is part of the DM74ALS157 series, which includes variants like the DM74LS157M and DM74LS157N. The ALS variant provides faster switching speeds than the standard LS version. The MX suffix typically denotes the SOIC-16 package format. Related parts include the DM74ALS158, which offers similar functionality with lower power dissipation.