DM74ALS151N

Overview

The DM74ALS151N is an octal multiplexer belonging to the Advanced Low-power Schottky (ALS) logic family. It features eight data inputs, three address select lines, and complementary outputs. The device operates within a standard TTL voltage range and utilizes a 16-pin DIP package. Key electrical parameters include a propagation delay of 20 ns at 5V with 50pF load, input clamp current of -18 mA, and output high/low currents of 400 µA and 8 mA respectively. It functions as a single 8-line-to-1 line selector.

Feature Summary

• Provides eight independent data inputs selectable via three address bits for routing specific signals to the output.
• Offers both true and inverted output states simultaneously to support diverse logic requirements.
• Utilizes advanced oxide-isolated ion-implanted Schottky process for improved switching speed and lower power consumption compared to standard LS devices.

Applications

• Data routing in microprocessor systems
• Waveform generation circuits
• Parallel-to-serial data conversion

Procurement Notes

Verify the manufacturer origin, as Fairchild Semiconductor has undergone corporate restructuring and acquisitions. Confirm that the component matches the original National Semiconductor or Fairchild specifications rather than a generic equivalent. Ensure the package type corresponds to the requested 16-pin DIP configuration and check for lead-free compliance if required by project standards.

Selection Notes

Select this component when an 8-channel multiplexing function is required with low power dissipation and moderate speed. It serves as a functional replacement for older 74LS151 designs where power efficiency is prioritized over maximum speed. Ensure the system voltage aligns with standard TTL levels and verify that the 16-pin DIP footprint fits the target PCB layout constraints.

Part Context

This part belongs to the 74ALS series, designed to bridge the performance gap between standard Low-power Schottky (LS) and High-speed Schottky (HS) logic families. It maintains pin compatibility with previous generations while offering reduced power consumption and faster switching characteristics. The 'N' suffix specifically denotes the 16-lead plastic dual-in-line package format.

Replacement Considerations

The DM74ALS151N is functionally compatible with the SN74ALS151 and MC10151. Verify pinout consistency when substituting with 74LS151 variants, noting the difference in power consumption and switching speeds. Cross-reference datasheets to ensure voltage thresholds match the application environment.