100390QC

Overview

The Fairchild Semiconductor 100390QC is a PECL to TTL translator featuring six functional channels with true output polarity. It operates within the ECL logic family and provides three-state outputs. The device is housed in a 28-lead Plastic Quad Flat Package (PQCC) with a body size of 0.450 x 0.450 inches, identified as LCC-28 under MO-047 standards. It exhibits a maximum propagation delay of 6.6 ns and supports an operating temperature range up to 85 °C.

Feature Summary

• Translates PECL signals to TTL levels for interface compatibility
• Provides six independent translation functions with true output polarity
• Features three-state outputs for bus line management
• Designed for high-speed ECL logic applications

Applications

• PECL to TTL signal level conversion
• High-speed digital interface circuits
• ECL logic system interfacing

Procurement Notes

Verify the component authenticity by checking the manufacturer marking against the official datasheet specifications. Confirm the package type matches the 28-lead PQCC/LCC-28 form factor. Ensure the device meets the required RoHS compliance status if applicable to your manufacturing process. Cross-reference the date code and lot number with supplier documentation to guarantee traceability and quality assurance.

Selection Notes

Select this component when direct interfacing between PECL sources and TTL destinations is required without external discrete components. Consider the six-function capacity for multi-channel designs. Evaluate the 6.6 ns delay against system timing requirements. Verify that the 85 °C maximum operating temperature aligns with the environmental conditions of the target application.

Part Context

This part belongs to the 100K series of ECL logic devices manufactured by Fairchild Semiconductor. It serves as a specialized interface solution bridging high-speed emitter-coupled logic families with transistor-transistor logic standards. The device integrates multiple translation functions into a single compact package, reducing board space compared to discrete solutions.

Replacement Considerations

Consult official replacement guides for equivalent PECL-to-TTL translators from Fairchild or other manufacturers. Verify pinout compatibility and electrical characteristics such as propagation delay and output drive strength before substitution.