SN74ALS138ADBR

Signal Switches, Multiplexers, Decoders Overview

The SN74ALS138ADBR is a decoder/demultiplexer from the Texas Instruments ALS logic family. It features three address inputs and eight active-low outputs, enabling one of eight lines to be selected based on input states. The device operates within a supply voltage range of 4.5 V to 5.5 V and includes two active-low and one active-high enable inputs for system expansion. Packaged in a 16-pin SOIC, it offers a propagation delay of 22 ns and supports through-hole or surface-mount installation styles with a maximum power dissipation of 200 mW.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides decoding functionality by converting three binary address inputs into one of eight mutually exclusive active-low output signals.

Signal Switches, Multiplexers, Decoders Applications

• Address decoding in microprocessor-based systems
• Demultiplexing data streams to specific channels
• Generating control signals for peripheral selection

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the package type matches the design requirements, as the 'D' suffix indicates an SOIC package. Confirm that the operating temperature range aligns with the application environment. Ensure the logic family compatibility is suitable for the target circuit interface. Check for any specific ordering suffixes that may affect RoHS compliance or packaging format.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a high-speed decoder with Schottky-clamped inputs is required. The ALS series provides faster switching speeds compared to standard LS logic while maintaining lower power consumption. Consider the SOIC package size for space-constrained PCB layouts. Verify that the enable pin configuration meets the system's control logic requirements.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the SN74ALS138A series of decoders and demultiplexers. It is designed for use in digital logic circuits requiring efficient address decoding. The ALS technology ensures improved performance over earlier generations. It is commonly used in computer memory addressing and I/O port selection applications.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Compatible substitutes include the SN74ALS138AN and SN74ALS138NSR. These parts share identical logical functions but differ in package types such as PDIP or SOIC. Verify pinout compatibility and electrical specifications before substitution.