DM74ALS157M

Overview

The DM74ALS157M 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 features buffered inputs and outputs for improved line receiving characteristics. The device selects a 4-bit word from one of two sources and routes it to four outputs, presenting true data at the output gates. It includes a separate strobe input for control. Typical propagation delay time is 9 ns, with typical power dissipation of 49 mW.

Feature Summary

• Contains inverters and drivers to supply full on-chip data selection to the four output gates
• Features buffered inputs and outputs for improved performance
• Provides a separate strobe input for data routing control

Applications

• Data selection in digital circuits
• Routing 4-bit words from multiple sources
• Multiplexing applications requiring low power consumption

Procurement Notes

Verify the specific ordering suffix 'M' corresponds to the 16-lead Small Outline Integrated Circuit (SOIC) package as defined in official Fairchild documentation. Confirm that the component meets the required ALS series specifications regarding propagation delay and power dissipation for your design constraints. Ensure compatibility with standard TTL logic levels.

Selection Notes

Select this component when a quad multiplexer with buffered I/O is required within an ALS logic system. The 9 ns propagation delay and 49 mW power dissipation make it suitable for applications balancing speed and power efficiency. Verify that the SOIC-16 package format fits the target PCB layout requirements.

Part Context

This part is part of the DM74ALS157 series, which also includes variants like the DM74ALS158. It is designed to expand any data input point in a circuit. The device is housed in a 16-lead Small Outline Integrated Circuit (SOIC) package, specifically JEDEC MS-012, 0.150 inch narrow width, identified by package number M16A.

Replacement Considerations

Check for direct equivalents within the same ALS family or compatible LS series devices if pin-out and electrical characteristics match. Verify package compatibility for surface-mount installation.