74LCX139MTR

Signal Switches, Multiplexers, Decoders Overview

The STMicroelectronics 74LCX139MTR is a low-voltage CMOS dual 2-to-4 line decoder and demultiplexer. It operates within a supply voltage range of 2.0V to 3.6V, with truth table functionality guaranteed down to 1.5V. The device features 5V tolerant inputs capable of interfacing with 5.5V signals. Propagation delay from address inputs (A, B) to outputs (Y) is 6.2ns maximum at 3.0V to 3.6V. Output drive capability is symmetrical at ±24mA minimum at 3.0V to 3.6V. It is housed in an SO-16 package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Features 5V tolerant inputs for direct interfacing with 5V signal environments while operating at lower voltages.
• Provides high-speed performance with balanced propagation delays suitable for low-power applications.
• Includes power-down protection on all inputs and outputs to prevent excessive current draw during power-off states.

Signal Switches, Multiplexers, Decoders Applications

• Low-power and high-speed 3.3V logic applications
• Address decoding in memory systems
• Demultiplexing data streams using active low enable inputs

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'MTR' corresponds to the SO-16 tape and reel packaging configuration. Confirm that the required operating temperature range aligns with the industrial specifications defined in the datasheet. Ensure input voltage levels do not exceed the absolute maximum ratings to maintain device reliability.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a dual decoder or demultiplexer is required with 5V tolerant inputs. It serves as a pin-compatible replacement for standard 74 series 139 devices but offers significantly lower power consumption and higher speed at 3.3V. Verify that the load capacitance requirements are met by the specified output drive capabilities.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to the 74LCX family of low-voltage CMOS logic devices manufactured by STMicroelectronics. The LCX series is designed to provide AC/ACT family speed performance combined with low power dissipation. The 74LCX139 specifically implements the dual 2-to-4 decoder function within this technology node.

Signal Switches, Multiplexers, Decoders Replacement Considerations

The datasheet indicates pin and function compatibility with the standard 74 series 139. Designers should verify that the voltage levels and drive currents of the legacy component match the LCX specifications before substitution.

Signal Switches, Multiplexers, Decoders FAQ

What is the maximum input voltage allowed for the 74LCX139MTR?

The device supports 5V tolerant inputs, allowing an input voltage up to 5.5V even when the supply voltage is lower.

How does the enable input affect the outputs?

When the active low enable input is held high, all four outputs remain in a high state regardless of the address inputs.