SN74AHCT138DBR

Signal Switches, Multiplexers, Decoders Overview

The SN74AHCT138DBR is a 3-line to 8-line decoder/demultiplexer from the Texas Instruments AHCT logic family, housed in a 16-pin SSOP package. It operates on a single supply voltage ranging from 4.5 V to 5.5 V and supports an operating temperature range of -40°C to +85°C. The device features TTL-compatible inputs with high-level input voltage (VIH) at 2 V and low-level input voltage (VIL) at 0.8 V. It provides outputs capable of sourcing and sinking up to 8 mA. Propagation delays are specified as a maximum of 12 ns at 15 pF load and 13 ns at 50 pF load when powered at 5 V.

Signal Switches, Multiplexers, Decoders Feature Summary

• Incorporates three enable inputs to simplify cascading and data reception
• Designed for high-speed memory decoding and data-routing applications requiring short propagation delay times
• Inputs are compatible with TTL-voltage levels

Signal Switches, Multiplexers, Decoders Applications

• High-performance memory decoding systems
• Data-transmission systems
• Data-routing applications

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the specific orderable part number matches the required SSOP-16 package configuration. Confirm the operating temperature range aligns with system requirements, as catalog versions may differ from military or enhanced product variants. Ensure proper handling precautions are observed due to electrostatic discharge sensitivity ratings.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when TTL voltage compatibility is required alongside CMOS performance characteristics. The inclusion of two active-low and one active-high enable inputs facilitates expansion into larger decoding schemes without external inverters. Verify that the output current capabilities meet the load requirements of the connected circuitry.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the SNx4AHCT138 series of 3-line to 8-line decoders and demultiplexers. The 'AHCT' designation indicates advanced high-speed CMOS technology with TTL-compatible inputs. The 'D' suffix denotes the SOIC/SSOP package style, while 'BR' indicates tape and reel packaging. This series is engineered to minimize system decoding effects in high-speed environments.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SN74AHCT138DR

Signal Switches, Multiplexers, Decoders FAQ

How many enable inputs does the SN74AHCT138DBR have?

The device incorporates three enable inputs: one active-high (G1) and two active-low (G2A and G2B).

What is the recommended bypass capacitor value for power supply stability?

A 0.1 μF capacitor is recommended for each VCC terminal to prevent power disturbance.