74LCXH2245MTC

Overview

The Fairchild Semiconductor 74LCXH2245MTC is a low-voltage bidirectional transceiver housed in a 20-TSSOP package. It integrates eight non-inverting buffers with three-state outputs, designed for bus-oriented applications. The device operates within a supply voltage range of 2V to 3.6V and features active bus-hold circuitry on data inputs. It includes 26-ohm series resistors in the B port outputs to reduce signal overshoot and undershoot. The component supports surface mount installation and functions reliably across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates active bus-hold circuitry to maintain valid logic levels without external pull-up resistors
• Includes internal series resistors in B port outputs to minimize signal overshoot and undershoot
• Provides bidirectional data flow control via dedicated direction input pin
• Features three-state outputs for effective bus management in parallel systems

Applications

• Bus-oriented memory and command address multiplexing
• Clock drivers and buffered oscillators
• Capacitive loading bus drivers

Procurement Notes

Verify the specific manufacturer designation, as Fairchild Semiconductor operations were acquired by onsemi. Confirm RoHS compliance status, as legacy stock may differ from current production runs. Ensure the 20-TSSOP package matches the design footprint requirements. Validate that the active bus-hold feature meets the system's floating input handling needs.

Selection Notes

Select this component when designing low-voltage systems requiring bidirectional data transfer between buses. The integrated bus-hold functionality simplifies board layout by eliminating external pull-up components. The inclusion of output series resistors aids in signal integrity management for high-speed digital interfaces operating at 3.3V or 2.5V logic levels.

Part Context

This part belongs to the 74LCXH family of low-voltage CMOS logic devices. It serves as a specialized variant of the standard 74HC2245, optimized for lower power consumption and enhanced signal stability through built-in termination resistors. The device complements other LCX logic gates by providing robust interface capabilities for mixed-voltage environments.

Replacement Considerations

The 74LCXH2245MTCX is a tape-and-reel version of the same functional device. Verify if the 74LVC2245 offers sufficient performance upgrades for higher speed requirements while maintaining pin compatibility.