74HC138DTR2G

Signal Switches, Multiplexers, Decoders Overview

The onsemi 74HC138DTR2G is a high-performance silicon-gate CMOS 1-of-8 decoder/demultiplexer housed in a TSSOP-16 package. It decodes three-bit address inputs (A0, A1, A2) to one of eight active-low outputs (Y0-Y7). The device operates within a supply voltage range of 2.0 V to 6.0 V and supports an operating temperature from -55°C to +125°C. Propagation delays vary by input source: up to 135 ns for address inputs at 2.0 V, decreasing to 23 ns at 6.0 V; chip select inputs exhibit delays up to 120 ns at 2.0 V and 20 ns at 6.0 V. Output drive capability supports 10 LSTTL loads.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features three chip select inputs (CS1, CS2, CS3) to facilitate demultiplexing, cascading, and chip-selecting functions.
• Outputs directly interface with CMOS, NMOS, and TTL logic families.
• Inputs are compatible with standard CMOS outputs and LSTTL outputs when pullup resistors are used.
• Provides high noise immunity characteristic of CMOS devices.

Signal Switches, Multiplexers, Decoders Applications

• Demultiplexing applications using address inputs to select specific outputs.
• Cascading multiple decoder units for expanded decoding capabilities.
• Chip-selecting functions in digital circuit architectures.

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the package suffix 'DT' corresponds to the TSSOP-16 configuration as specified in the ordering information. Confirm RoHS compliance status and lead-free packaging details via the manufacturer's current documentation. Ensure the component matches the Datasheet publication number 74HC138/D for accurate electrical parameter validation.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for designs requiring a single 3-to-8 line decoder with active-low outputs in a surface-mount format. Consider the wide operating voltage range of 2.0 V to 6.0 V for compatibility with various logic levels. Evaluate propagation delay specifications against system timing requirements, noting that delays decrease significantly at higher supply voltages.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices manufactured by onsemi. It shares pinout compatibility with the LS138 variant while offering CMOS performance characteristics. The device is designed for general-purpose digital decoding tasks within industrial and consumer electronic applications.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The datasheet notes pinout identity with the LS138. Verify functional equivalence if substituting with other 74HC138 variants from different manufacturers, ensuring voltage ranges and output drive capabilities meet design specifications.