74LCX138TTR

Signal Switches, Multiplexers, Decoders Overview

The 74LCX138TTR is a low voltage CMOS 3-to-8 line decoder manufactured by STMicroelectronics. It features inverting outputs and 5V tolerant inputs, making it suitable for interfacing with 5V signal environments while operating at lower voltages. The device utilizes sub-micron silicon gate and double-layer metal wiring C2MOS technology to achieve high speed and low power consumption. It operates within a supply voltage range of 2.0V to 3.6V. Key electrical parameters include a maximum propagation delay of 6.7ns at VCC = 3V, symmetrical output impedance with minimum currents of ±24mA at VCC = 3V, and balanced propagation delays (tPLH ≈ tPHL).

Signal Switches, Multiplexers, Decoders Feature Summary

• Features 5V tolerant inputs allowing direct interfacing with 5V signal environments.
• Provides three enable inputs (G1, G2A, G2B) to facilitate cascade connections and address decoding.
• Includes power-down protection on both inputs and outputs to prevent excessive current draw during power-off states.
• Offers robust ESD protection with HBM immunity exceeding 2000V.

Signal Switches, Multiplexers, Decoders Applications

• Address decoders for memory systems.
• Low power and high speed 3.3V applications.
• Systems requiring interface between 5V logic signals and lower voltage components.

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'TTR' corresponds to the TSSOP-16 package and tape and reel packaging configuration as listed in official documentation. Confirm that the component meets the required environmental standards, such as ECOPACK lead-free specifications, if applicable to your manufacturing process. Ensure compatibility with recommended operating conditions, particularly the supply voltage range of 2.0V to 3.6V and the operating temperature range of -40°C to +85°C.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when designing circuits that require a 3-to-8 line decoder with inverting outputs in a low voltage environment. It is appropriate for applications needing 5V tolerant inputs to bridge 5V and 3.3V logic levels. Consider its high-speed performance and low power consumption characteristics compared to standard 5V AC/ACT families. Ensure the design accommodates the symmetrical output drive capability and the specific enable logic requirements defined in the truth table.

Signal Switches, Multiplexers, Decoders Part Context

The 74LCX138 belongs to the LCX series of low-voltage CMOS logic devices from STMicroelectronics. This series is designed to provide performance comparable to 5V AC/ACT families but with significantly lower power consumption. The 74LCX138 specifically functions as a 3-to-8 line decoder/demultiplexer with inverting outputs, utilizing advanced sub-micron technology to ensure fast switching speeds and reliable operation in modern electronic systems.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The datasheet indicates pin and function compatibility with the 74 series 138. Verify if other manufacturers' equivalents or different package variants like the SO-16 version (74LCX138MTR) meet the physical and electrical requirements of the existing design without necessitating layout changes.