DM74ALS137N

Overview

The DM74ALS137N is a 3-to-8 line decoder/demultiplexer with address latches, manufactured by onsemi in a 16-pin PDIP package. It operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range of 0°C to +70°C. The device features three enable inputs (G1, G2, GL) for independent control and cascading. Propagation delays from select inputs A, B, C to outputs Y are specified between 5ns and 20ns depending on transition direction.

Feature Summary

• Combines a 3-to-8 decoder with 3-bit address latches for glitch-free strobed applications
• Incorporates three enable inputs to simplify system cascading
• Utilizes advanced oxide-isolated, ion-implanted Schottky TTL process

Applications

• Bus-oriented systems requiring stored-address decoding
• Glitch-free decoder implementations
• Strobed application environments

Procurement Notes

Verify the specific ordering code suffix against current manufacturer documentation to confirm package type and availability status. Confirm RoHS compliance details directly with the supplier or official datasheet as regulatory requirements may vary by production lot. Ensure the component meets the required environmental specifications for the intended deployment environment before finalizing procurement decisions.

Selection Notes

Select this component when a decoder requires address storage capabilities to prevent output glitches during address transitions. The ALS logic family offers low power dissipation compared to standard TTL variants. Verify that the 16-pin PDIP package fits the target PCB layout constraints and that the operating temperature range aligns with the system's thermal design requirements.

Part Context

This part belongs to the 74ALS logic family, characterized by advanced Schottky technology for improved speed and lower power consumption. The DM74ALS137 specifically integrates latch functionality into the decoding path, distinguishing it from standard decoders like the 74ALS138 which lack address storage. This integration simplifies bus interface designs where stable decoding is critical during address changes.

Replacement Considerations

DM74ALS137M

FAQ

How does the latch-enable input (GL) function?

When GL is LOW, the device acts as a standard decoder. When GL transitions from LOW to HIGH, the address present at inputs A, B, and C is stored in the internal latches, ignoring further address changes until GL goes LOW again.

What is the typical power dissipation of the DM74ALS137N?

The typical power dissipation is 28 mW, reflecting the low-power characteristics of the Advanced Low-power Schottky (ALS) process.