DM74LS251N

Overview

The DM74LS251N is a 3-STATE 1-of-8 Line Data Selector/Multiplexer manufactured by onsemi. It features full on-chip binary decoding to select one of eight data sources and includes a strobe-controlled output. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports an operating temperature range of 0 °C to +70 °C. Propagation delay from data inputs (D) to outputs (Y/W) ranges from 15 ns to 38 ns depending on load conditions.

Feature Summary

• Features complementary true and inverted outputs for versatile logic generation
• Includes full on-chip binary decoding for direct selection of eight data lines
• Strobe-controlled 3-STATE outputs allow direct connection to common system buses

Applications

• Parallel-to-serial data conversion
• Multiplexing multiple signal lines into a single transmission path
• Universal function generator for four-variable logic functions

Procurement Notes

Verify the specific package configuration, as the DM74LS251N designation corresponds to the 16-Lead Plastic Dual-In-Line Package (PDIP). Confirm RoHS compliance status with the manufacturer or distributor, as legacy LS series components may vary in environmental certification. Ensure the application environment remains within the specified 0 °C to +70 °C operating temperature range.

Selection Notes

Select this component when a TTL-compatible multiplexer with high-speed switching and bus isolation is required. The device provides both assertion and negation outputs, simplifying circuit design for complex logic applications. Verify that the system power supply strictly adheres to the 4.75 V to 5.25 V limits to maintain electrical characteristics.

Part Context

This component belongs to the 74LS logic family, utilizing Low Power Schottky technology to balance speed and power consumption. It serves as the 3-STATE variant of the standard DM74LS151 multiplexer, adding bus interface capabilities while maintaining similar functional decoding architecture.

Replacement Considerations

Direct pin-compatible substitutes include SN74LS251N from Texas Instruments and other manufacturers offering the standard 74LS251 specification.