74LCXH245WM

Overview

The onsemi 74LCXH245WM is an octal bidirectional transceiver featuring non-inverting buffers with three-state outputs. It operates within a supply voltage range of 2.0V to 3.6V and utilizes advanced CMOS technology for high-speed performance while maintaining low power dissipation. The device incorporates patented bushold circuitry on its data inputs, which eliminates the need for external pull-up or pull-down resistors to maintain valid logic levels on unused or floating lines. It provides ±24mA output drive capability at VCC = 3.0V and features 5V tolerant control inputs.

Feature Summary

• Patented bushold input circuitry maintains valid logic states without external resistors
• Five-volt tolerant control inputs allow interfacing with higher voltage systems
• Advanced CMOS fabrication ensures high-speed operation with low power consumption
• Three-state outputs enable bus-oriented applications with effective isolation

Applications

• Bus-oriented communication systems
• Two-way asynchronous data bus transmission
• Voltage level translation between 2.5V and 3.3V domains

Procurement Notes

Verify the exact ordering code against current manufacturer databases, as Fairchild part numbers containing underscores may have been converted to dashes (e.g., 74LCXH245-WM) during system integration. Confirm package availability and lead times directly with authorized distributors, as specific stock levels fluctuate. Ensure compliance with RoHS standards and verify that the component meets all environmental and safety requirements for your intended application before procurement.

Selection Notes

Select this component when designing systems requiring bidirectional data transfer between buses operating at 2.5V or 3.3V logic levels. The integrated bushold feature simplifies PCB layout by removing the requirement for discrete pull-up or pull-down resistors on data lines. Choose this device over standard LCX variants if 5V tolerant inputs are necessary for mixed-voltage environments. Ensure the SOIC-20 package fits the available board space and thermal constraints.

Part Context

This device belongs to the LCXH family of low-voltage CMOS logic ICs, designed specifically for high-speed, low-power applications in portable and battery-operated equipment. It serves as a bridge between different voltage domains, facilitating communication between 2.5V and 3.3V subsystems. The inclusion of bushold technology distinguishes it from standard transceivers by providing inherent input state retention, enhancing reliability in floating bus conditions.

Replacement Considerations

Check for updated part numbers due to the Fairchild-to-onsemi integration, where underscore characters in legacy codes were replaced with dashes. Verify pinout compatibility and electrical specifications against any alternative octal bus transceivers. Ensure that substitute components also support the required 5V tolerant inputs and bushold functionality if those features are critical to the design.