MC74LCX245MG

Overview

The MC74LCX245MG is a low-voltage CMOS octal bus transceiver manufactured by onsemi. It operates from a 2.0 V to 5.5 V supply and features non-inverting, three-state outputs with 5 V tolerance. The device provides balanced output sink and source current capabilities of 24 mA at both A and B ports. It includes an Output Enable input that disables ports when HIGH and a Transmit/Receive input that controls data flow direction.

Feature Summary

• Provides bidirectional data transmission between two 8-bit buses using a single control signal for direction selection.
• Features five-volt tolerant inputs and outputs, allowing safe interfacing between 3.3 V devices and 5 V systems.
• Includes an IOFF specification to guarantee high-impedance states during power-off conditions, supporting live insertion.

Applications

• Memory address driving in embedded systems
• TTL level bus oriented transceiver applications
• Interface capability between 5 V TTL logic and low-voltage CMOS circuits

Procurement Notes

Verify the specific suffix 'MG' against official datasheets to confirm package type and tape-and-reel versus tube packaging variations. Ensure compatibility with required operating temperatures and voltage levels before procurement. Cross-reference RoHS compliance status as manufacturing processes may evolve over time.

Selection Notes

Select this component for designs requiring robust interface between mixed voltage domains. The 24 mA drive strength supports moderate capacitive loads without external buffering. Consider the 5 V tolerance feature if the system involves legacy 5 V peripherals alongside modern low-voltage processors.

Part Context

This part belongs to the LCX series of low-voltage CMOS logic devices. It serves as a standard solution for expanding bus width or bridging voltage gaps in digital communication architectures. The octal configuration reduces board space compared to individual bit-level transceivers.

Replacement Considerations

Direct substitutes include MC74LCX245DTG and MC74LCX245DTR2G. Verify pinout compatibility and package dimensions (SOIC vs TSSOP) when replacing. Ensure electrical characteristics match the original design requirements.