DM74LS258BM

Overview

The DM74LS258BM is a quadruple 2-line to 1-line data selector/multiplexer manufactured by National Semiconductor. It features four independent multiplexers, each selecting one of two data inputs based on an address line. The device provides three-state outputs for bus-oriented systems. It operates within the LS TTL logic family and is housed in a 16-pin Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Contains four independent 2-to-1 multiplexers
• Provides three-state output capability for bus isolation
• Compatible with standard LS TTL logic levels

Applications

• Data routing in microprocessor systems
• Address decoding circuits
• Bus switching applications

Procurement Notes

Verify the manufacturer designation matches National Semiconductor or its successors. Confirm the suffix 'BM' corresponds to the SOIC-16 package. Check RoHS compliance status as original specifications may predate modern environmental directives. Ensure the component is sourced from authorized distributors to avoid counterfeit parts.

Selection Notes

Select this component when four independent 2:1 multiplexing functions are required in a single package. The three-state outputs make it suitable for shared bus architectures. Verify that the LS TTL speed and power consumption meet system requirements compared to faster ALS or lower power LSTTL alternatives.

Part Context

This part belongs to the 74LS series of digital logic components. The 74LS258 is a standard multiplexer function. National Semiconductor was a primary producer before its semiconductor division was acquired by Texas Instruments. The DM prefix typically denotes military or extended temperature grade origins, though commercial variants exist.

Replacement Considerations

Equivalent parts include SN74LS258BD from Texas Instruments. Other compatible devices include the N74LS258AD from Signetics. Ensure pin compatibility and electrical characteristics match before substitution.