74LCXH2245MTCX

Overview

The 74LCXH2245MTCX is a low-voltage bidirectional transceiver from the 74LCXH series, manufactured by Fairchild Semiconductor. It integrates eight non-inverting buffers with three-state outputs in a 20-TSSOP package. The device operates within a supply voltage range of 2V to 3.6V and features 5V-tolerant control inputs. Key specifications include an output drive current of 24mA for both high and low states, and an operating temperature range of -40°C to +85°C.

Feature Summary

• Integrates active bus-hold circuitry on data inputs to eliminate the need for external pull-up resistors for unused or floating lines.
• Incorporates 26-ohm series resistors in the B port outputs to reduce signal overshoot and undershoot during transmission.
• Provides five-volt tolerant control inputs, enabling seamless interfacing between 3.3V systems and 5V environments.

Applications

• Bus-oriented applications requiring bidirectional data transfer.
• Low-voltage (2.5V/3.3V) system interfacing with 5V logic environments.
• High-density memory and flash card interfaces.

Procurement Notes

Verify the specific suffix against official datasheets to confirm pinout and electrical characteristics. Ensure the component meets RoHS compliance requirements if applicable to your manufacturing standards. Confirm the manufacturer origin, as production may have transitioned to onsemi following corporate restructuring. Validate package dimensions against JEDEC MO-153 standards for PCB footprint compatibility.

Selection Notes

Select this component when designing low-voltage systems that require robust noise immunity and simplified input handling. The integrated bus-hold feature reduces bill-of-materials complexity by removing external pull-up components. The inclusion of series resistors aids in signal integrity management for high-speed buses. Ensure the application voltage remains within the specified 2V to 3.6V range for optimal performance.

Part Context

This part belongs to the 74LCXH family, which extends the standard LCX logic capabilities with enhanced features like bus-hold and series resistors. It serves as a specialized variant within the broader 74LCX/LVC/Z series ecosystem, designed specifically for complex bus architectures where signal quality and input state management are critical constraints.

Replacement Considerations

The 74LCXH2245SJ is a documented substitute offering identical logical functionality in a 20-SOP package. Verify mechanical footprint differences between TSSOP and SOP variants before substitution. Other family members like the 74LCX245 lack the specific bus-hold and resistor features, requiring design adjustments if used as replacements.