74LCX125SJ

Overview

The Fairchild Semiconductor 74LCX125SJ is a low-voltage CMOS quad bus buffer manufactured using sub-micron silicon gate and double-layer metal wiring CMOS technology. It operates within a supply voltage range of 2.0 V to 3.6 V, providing high-speed performance comparable to the 5 V AC/ACT family while maintaining lower power consumption. The device features 5 V tolerant inputs and outputs, allowing direct interfacing with 5 V signal environments. It includes three-state outputs controlled by input G, which must be set high to place outputs in a high-impedance state.

Feature Summary

• Features 5 V tolerant inputs and outputs for seamless interfacing between 3.3 V and 5 V systems.
• Provides high-speed operation with symmetrical output impedance and balanced propagation delay.
• Includes power-down protection on inputs and outputs to prevent excessive current draw during low-power states.

Applications

• Low-power and high-speed 3.3 V applications
• Interfacing 3.3 V systems to 5 V signal environments
• PCI bus level applications

Procurement Notes

Verify the specific suffix 'SJ' against official Fairchild or onsemi documentation to confirm package type and tape/reel specifications. Ensure compatibility with RoHS standards and check for moisture sensitivity levels if required for assembly processes. Confirm availability through authorized distributors as component status may vary.

Selection Notes

Select this component when a quad bus buffer with 5 V tolerance is required for 3.3 V logic systems. It serves as a suitable replacement for older 5 V AC/ACT buffers where lower power consumption is critical. Consider the 14-pin SOP package constraints and ensure the design accommodates the 2.0 V to 3.6 V operating voltage range.

Part Context

The 74LCX125 belongs to the LCX series of low-voltage CMOS logic devices. This series is designed to bridge the gap between traditional 5 V logic families and modern low-voltage applications. The 74LCX125 specifically functions as a non-inverting quad bus buffer with three-state outputs, widely used in digital communication and data transmission lines.

Replacement Considerations

Direct pin-compatible replacements include other manufacturers' 74LCX125 variants such as those from onsemi (e.g., 74LCX125MTCX). Verify electrical characteristics like propagation delay and output drive current to ensure functional equivalence in the target circuit.