MC74LCX245DTR2

Overview

The MC74LCX245DTR2 is an octal bidirectional transceiver from the onsemi 74LCX logic family. It operates within a supply voltage range of 2.0 V to 5.5 V and features five-volt tolerant inputs and outputs, enabling safe interfacing with 5 V devices even when the device supply is lower. The component provides balanced output sink and source current capabilities of 24 mA at both A and B ports. It includes Transmit/Receive direction control and Output Enable functions, supporting live insertion and withdrawal applications while maintaining high impedance states.

Feature Summary

• Features five-volt tolerant inputs and outputs for direct interface with 5 V TTL logic
• Provides balanced 24 mA output drive capability at both A and B ports
• Supports live insertion and withdrawal operations through controlled high-impedance states
• Maintains near-zero static supply current across all three logic states

Applications

• Memory address driving in low-voltage systems
• TTL level bus oriented transceiver applications
• Interface between 2.0 V to 5.5 V logic domains and 5 V peripherals
• Systems requiring live insertion and withdrawal support

Procurement Notes

Verify that the specific suffix matches the required tape-and-reel packaging configuration, as package variants may differ. Confirm RoHS compliance status and material declarations against the latest manufacturer documentation. Ensure the ordering part number aligns with the intended operating temperature range and pinout requirements for your specific PCB layout design.

Selection Notes

Select this component when bidirectional data transfer is required between low-voltage logic domains and 5 V tolerant interfaces. The 24 mA drive strength supports moderate capacitive loads without external buffering. Consider the 2.0 V minimum supply voltage for battery-powered or low-power system designs where power conservation is critical alongside signal integrity requirements.

Part Context

This device belongs to the MC74LCX series of low-voltage CMOS octal transceivers manufactured by onsemi. The LCX family is designed to bridge legacy TTL logic levels with modern low-voltage CMOS standards. The DTR2 suffix indicates a specific surface-mount tape-and-reel packaging variant suitable for automated assembly processes in high-volume manufacturing environments.

Replacement Considerations

MC74LCX245DTG

FAQ

How does the device handle voltage translation between different logic levels?

The MC74LCX245DTR2 utilizes five-volt tolerant inputs and outputs, allowing it to be safely driven by 5 V devices even when its own VCC supply is less than 5.0 V.

What is the maximum output current capability of the transceiver?

The device offers a balanced output sink and source current capability of 24 mA at both the A and B port terminals.