74ACT138SJX

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74ACT138SJX is a high-speed 1-of-8 decoder/demultiplexer belonging to the 74ACT logic family. It accepts three binary weighted address inputs (A0, A1, A2) and provides eight mutually exclusive active-LOW outputs (O0-O7). The device operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -40°C to +85°C. It features TTL-compatible inputs and includes multiple input enables for parallel expansion capabilities.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features TTL-compatible inputs for direct interface with standard logic families
• Provides demultiplexing capability by utilizing enable inputs as data strobes
• Includes multiple input enables allowing easy parallel expansion to larger decoding configurations

Signal Switches, Multiplexers, Decoders Applications

• High-speed bipolar memory chip select address decoding
• Parallel expansion to 1-of-24 or 1-of-32 decoders using multiple devices
• General-purpose 1-of-8 decoding in digital systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific package variant against the ordering information table, as the datasheet lists SOIC-16 and TSSOP-16 options. Confirm that the requested part number matches the exact suffix required for the desired shipping configuration. Ensure compatibility with the specified 4.5 V to 5.5 V supply voltage range during system design validation.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL-compatible inputs are required alongside AC speed performance. The ACT series offers reduced ICC compared to standard AC devices. Consider the available package types, such as SOIC-16 or TSSOP-16, based on board space constraints. Verify that the application requires active-LOW outputs and supports the specified operating temperature range.

Signal Switches, Multiplexers, Decoders Part Context

This device is part of the broader 74AC/ACT138 family manufactured by onsemi. It shares functional similarities with other 1-of-8 decoders but is distinguished by its ACT logic characteristics, specifically the TTL-compatible input thresholds. The family supports various packaging options including surface-mount technologies suitable for automated assembly processes.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The MC74ACT138DG is listed as a potential replacement option. Verify pinout compatibility and electrical specifications before substitution.