74LCX540MTCX

Overview

The Fairchild Semiconductor 74LCX540MTCX is a low-voltage CMOS octal buffer and line driver featuring inverting logic with three-state outputs. It operates within a supply voltage range of 2V to 3.6V, utilizing the 74LCX series technology for high-speed performance and low power consumption. The device integrates eight independent channels, each providing an inverting buffer function with controlled output impedance. Packaged in a 20-lead Thin Shrink Small Outline Package (TSSOP), it supports surface-mount assembly. The component includes ESD protection circuits and is designed for applications requiring signal buffering and level shifting between different voltage domains.

Feature Summary

• Octal configuration with inverting buffer functionality
• Three-state output capability for bus-oriented systems
• Low voltage operation compatible with 2V to 3.6V supplies
• High-speed performance with low static power consumption

Applications

• Memory module data buffering
• Clock distribution networks
• Consumer electronics signal processing
• Portable equipment interface circuits

Procurement Notes

Verify the manufacturer designation as Fairchild Semiconductor or onsemi, noting that onsemi acquired Fairchild's semiconductor business. Confirm the package type is TSSOP-20 and the logic family is 74LCX. Ensure RoHS compliance documentation is available. Check for any specific suffix variations that might indicate tape-and-reel packaging versus bulk quantities. Validate the operating temperature range matches industrial standards if required for your application.

Selection Notes

Select this component when an octal inverting buffer with three-state outputs is required for low-voltage digital systems. It is suitable for designs needing high-speed signal integrity with minimal power dissipation. Consider the 2V to 3.6V supply range compatibility with modern microcontrollers and memory devices. The TSSOP-20 package offers a compact footprint for space-constrained PCB layouts. Ensure input voltage levels are compatible with the driving source within the specified limits.

Part Context

The 74LCX540 belongs to the 74LCX series of low-voltage CMOS logic devices, which succeeded earlier 74LVC and 74HC families. This series is characterized by its ability to operate at lower voltages while maintaining fast switching speeds. The '540' designation specifically indicates an octal buffer with inverting logic and three-state outputs. Fairchild Semiconductor was a primary producer of this logic family before its acquisition by onsemi, establishing it as a standard component in mixed-signal and digital circuit designs.

Replacement Considerations

Equivalent parts include MM74HC540MTCX from onsemi, though HC series specifications differ slightly. Other potential substitutes may include variants from Texas Instruments or NXP within the same logic family. Verify pinout compatibility and electrical characteristics such as propagation delay and output current drive capabilities before substitution.