74LCXZ245MTC

Overview

The Fairchild Semiconductor 74LCXZ245MTC is an octal bus transceiver belonging to the LCX logic family. It features eight non-inverting bidirectional buffers with three-state outputs, designed for low-voltage applications operating between 2.3V and 3.6V. The device provides 5V tolerant inputs and outputs, enabling safe interfacing with 5V signal environments while maintaining CMOS low power dissipation. Packaged in a 20-pin TSSOP (TSSOP14 equivalent code PDSO20), it supports live insertion and withdrawal. Key electrical characteristics include a maximum propagation delay of 7.0 ns at VCC = 3.3V and output drive capabilities of ±24 mA.

Feature Summary

• Provides bidirectional data transmission across eight channels with non-inverting logic functionality.
• Features five-volt tolerant inputs and outputs for direct interface with legacy 5V systems.
• Supports live insertion and withdrawal operations without causing bus contention or glitches.
• Maintains high-impedance states during power-up and power-down conditions.

Applications

• Bus-oriented memory and disk controller architectures
• High-density data acquisition systems
• Consumer products requiring low voltage operation

Procurement Notes

Verify the specific suffix 'Z' against official Fairchild documentation, as standard datasheets typically list '74LCX245MTC'. Confirm RoHS compliance status and lead-free designation directly from the manufacturer's current ordering information. Ensure the package type matches the required 20-pin TSSOP footprint for your PCB layout.

Selection Notes

Select this component when designing systems that require bidirectional data transfer between 3.3V logic domains and 5V peripherals. The LCX series offers superior speed compared to older LVC families while maintaining low power consumption. Verify that the load capacitance requirements do not exceed the specified limits to ensure signal integrity at the target clock speeds.

Part Context

This part belongs to the Fairchild LCX logic family, which utilizes advanced CMOS technology for high-speed operation. It serves as a successor to earlier LVC devices, offering improved performance metrics. The 74LCX245 variant specifically addresses the need for robust bus transceivers in portable and battery-powered electronics where power efficiency is critical.

Replacement Considerations

Equivalent parts include MC74LCX245DT from ON Semiconductor and TC74LCX245F from Toshiba. These alternatives share identical logical functions and pinouts but may differ in specific electrical parameters or packaging options. Always consult individual datasheets before substitution.