DM74LS157N

Overview

The DM74LS157N is a quad 2-line to 1-line data selector/multiplexer manufactured by onsemi, utilizing LS-TTL logic technology. It features a 16-lead Plastic Dual-In-Line Package (PDIP) with a 0.300-inch width. The device operates within a supply voltage range of 4.75V to 5.25V and supports an operating temperature range of 0°C to +70°C. It provides four independent multiplexers, each selecting between two inputs based on a common select line and strobe control.

Feature Summary

• Contains four independent 2-input to 1-output multiplexers for parallel data selection
• Features buffered inputs and outputs to ensure signal integrity
• Includes a separate strobe input for enabling or disabling the output gates

Applications

• Multiplexing dual data buses
• Expanding data input points in digital systems
• Generating functions of two variables where one variable is common

Procurement Notes

Verify component authenticity through authorized distributors. Confirm package type matches the 16-lead PDIP specification. Check RoHS compliance status as original datasheets may indicate non-compliance depending on manufacturing date. Ensure storage conditions adhere to recommended temperature ranges to maintain device reliability.

Selection Notes

Select this component when requiring multiple independent data paths with low propagation delay characteristics typical of LS-TTL families. Consider the DM74LS158 if inverted outputs are preferred to minimize delay. Evaluate power dissipation requirements against system thermal constraints, noting the typical dissipation values specified in the electrical characteristics table.

Part Context

This part belongs to the Fairchild Semiconductor 74LS series, now distributed by onsemi. It is functionally compatible with other standard 74LS logic devices. The 'N' suffix specifically denotes the 16-lead Plastic Dual-In-Line Package (PDIP), distinguishing it from surface mount variants like the SOIC package.

Replacement Considerations

The DM74LS158N serves as a direct functional substitute if inverted outputs are acceptable. Other manufacturers producing equivalent 74LS157 parts in PDIP packages may also be considered, provided they meet the same electrical specifications and pinout compatibility.