DM74ALS138N

Overview

The DM74ALS138N is a 3-to-8 line decoder/demultiplexer manufactured by onsemi, utilizing an Advanced Oxide-Isolated Schottky TTL process. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a free air operating temperature from 0 °C to +70 °C. The device features three binary select inputs (A, B, C) and three enable inputs (G1, G2A, G2B). Propagation delays are specified with maximum values of 8 ns for HIGH-to-LOW transitions and 2 ns for LOW-to-HIGH transitions at VCC = 4.5V to 5.5V. It is housed in a 16-Lead Plastic Dual-In-Line Package (PDIP).

Feature Summary

• Incorporates three enable inputs to simplify cascading and data reception without external gates.
• Features fully buffered inputs presenting only one normalized load to the driving circuit.
• Inputs are clamped with high-performance Schottky diodes to suppress line-ringing.

Applications

• High-performance memory decoding systems
• Data routing applications requiring short propagation delay times
• Expansion of decoders to implement 24-line or 32-line configurations

Procurement Notes

Verify the specific manufacturer origin, as the datasheet indicates Fairchild Semiconductor Corporation authorship while current branding may differ. Confirm package integrity for the PDIP-16 configuration upon receipt. Ensure compliance with the life support policy restrictions if intended for critical implant or life-sustaining systems. Validate RoHS status through official documentation prior to integration.

Selection Notes

Select this component when low power dissipation and high-speed switching are required for memory decoding. The ALS logic family offers superior performance compared to standard TTL. Verify that the system voltage remains within the 4.5 V to 5.5 V range. Consider the PDIP-16 package constraints for through-hole mounting requirements in the target design.

Part Context

This device belongs to the 74ALS logic family, characterized by advanced oxide-isolated ion-implanted Schottky technology. It serves as a direct functional equivalent to other industry-standard 3-to-8 decoders within the same logic family. The N suffix specifically denotes the 16-Lead Plastic Dual-In-Line Package format.

Replacement Considerations

SN74ALS138AN