M74HCT138RM13TR

Overview

The M74HCT138RM13TR is a high-speed CMOS 3-to-8 line decoder manufactured by STMicroelectronics. It features three binary select inputs (A, B, C) and three enable inputs (G1, G2A, G2B). The device provides eight active-low data outputs (Y0 to Y7). It operates within a supply voltage range of 4.5V to 5.5V. Typical propagation delay is 16ns at VCC = 4.5V. Quiescent supply current is 4μA maximum at 25°C. High-level input voltage is 2.0V minimum, and low-level input voltage is 0.8V maximum. Symmetrical output impedance ensures |IOH| = IOL = 4mA minimum.

Feature Summary

• Provides decoding function for memory systems and address decoders using three binary select inputs.
• Includes three enable inputs to facilitate cascade connection and application control.
• Features balanced propagation delays and symmetrical output impedance for reliable signal integrity.

Applications

• Address decoders for memory systems
• Cascaded logic circuit configurations
• High-speed digital decoding applications

Procurement Notes

Verify the specific ordering suffix RM13TR corresponds to the SOP-16 tape and reel packaging configuration. Confirm that the component meets RoHS compliance requirements for the intended manufacturing process. Ensure the supply voltage aligns with the specified 4.5V to 5.5V operating range to maintain functional specifications.

Selection Notes

Select this component when a 3-to-8 inverting decoder is required with TTL-compatible input thresholds. Consider the HCT series for compatibility with standard TTL logic levels while utilizing CMOS power characteristics. Evaluate the package size and thermal dissipation capabilities against the system's physical constraints and operating temperature range.

Part Context

This part belongs to the M74HCT138 family of 3-to-8 line decoders. It is pin and function compatible with the standard 74 series 138 logic devices. The device utilizes silicon gate C2MOS technology to achieve high speed and low power dissipation. It serves as a fundamental building block for complex digital addressing and decoding tasks.

Replacement Considerations

Compatible replacements include other manufacturers' versions of the 74HCT138 logic decoder. Verify pinout compatibility and electrical specifications such as propagation delay and supply voltage range before substitution. Ensure the replacement device supports the required SOP-16 package or an equivalent footprint.