100311QC

Overview

The Fairchild Semiconductor 100311QC is a high-speed ECL logic component belonging to the 100K series. It functions as a dual 2-input Exclusive-OR (XOR) gate with open-emitter outputs. The device is housed in a 28-pin Plastic Quad Flatpack (PQCC) package, specifically identified as LCC-28 with dimensions of 0.450 x 0.450 inches. It supports five functional units within the broader family context but operates as a dual XOR in this specific configuration. The component features voltage compensated operation suitable for ECL power supplies ranging from -4.2V to -5.7V. It is designed for industrial temperature ranges and includes internal pull-down resistors on inputs to minimize loading effects.

Feature Summary

• Dual 2-input Exclusive-OR logic functionality optimized for high-speed switching applications
• Open-emitter output structure compatible with standard ECL termination requirements
• Voltage compensated design ensuring stable performance across specified ECL supply variations
• Integrated input pull-down resistors to reduce signal loading and improve noise immunity

Applications

• High-speed digital data processing circuits requiring exclusive-logic operations
• ECL-based communication interface systems for parity checking and error detection
• Complex logic gate implementations in military or aerospace-grade computing hardware

Procurement Notes

Verify the authenticity of the 100311QC by checking manufacturer markings against official Fairchild Semiconductor documentation. Confirm the package type matches the specified PQCC28/LCC-28 form factor. Ensure the component meets the required industrial temperature specifications if deployed in harsh environments. Cross-reference the datasheet revision to confirm pinout compatibility with existing board designs.

Selection Notes

Select the 100311QC when designing systems that require dual XOR gates within an ECL architecture. This component is appropriate for applications needing low propagation delay and high fan-out capabilities typical of the 100K series. Consider the plastic LCC-28 package for surface-mount assembly processes. Evaluate thermal management requirements based on the open-emitter output characteristics and operating voltage range.

Part Context

The 100311QC is part of Fairchild's extensive 100K ECL logic family, which provides standardized high-speed digital components. This series is widely used in telecommunications and computing infrastructure where speed and reliability are critical. The 100K family offers various logic functions, including gates, flip-flops, and drivers, all sharing common electrical characteristics and pinouts for system flexibility.

Replacement Considerations

Check for direct pin-compatible equivalents from National Semiconductor or other manufacturers producing 100K-series ECL devices. Verify that any substitute maintains the same XOR functionality, open-emitter outputs, and voltage compensation characteristics. Ensure the replacement package matches the 28-pin LCC footprint to fit existing PCB layouts without modification.