100398QC

Overview

The Fairchild Semiconductor 100398QC is a bidirectional mixed-signal translator featuring one circuit with four channels. It operates within an ECL to TTL interface configuration, supporting input signals from ECL logic families and translating them to TTL levels. The device is housed in a 28-pin PLCC package (MO-047) measuring 11.51x11.51 mm. Electrical characteristics specify operation with VEE ranging from -4.2V to -5.7V and GND at 0V across a temperature range of 0°C to +85°C. The maximum propagation delay is 6.6 ns, with 3-state outputs.

Feature Summary

• Bidirectional translation capability between ECL and TTL logic families
• Quad differential channel architecture for high-speed signal conversion
• Three-state output configuration for bus line compatibility

Applications

• ECL to TTL level shifting in mixed-signal systems
• TTL to ECL level shifting interfaces
• High-speed digital communication bridges

Procurement Notes

Verify the specific datasheet revision and RoHS compliance status directly with Fairchild Semiconductor or authorized distributors. Confirm that the 28-PLCC package dimensions match the design footprint requirements. Ensure voltage supply conditions align with the specified -4.2V to -5.7V range for proper operation.

Selection Notes

Select this component when bidirectional translation between ECL and TTL standards is required in a single integrated circuit. The quad-channel design reduces board space compared to discrete solutions. Verify that the 6.6 ns delay meets system timing constraints and that the 3-state outputs are necessary for the target bus topology.

Part Context

This part belongs to the Fairchild 100 series logic family, specifically designed as a mixed-signal translator. It addresses the need for interfacing legacy ECL equipment with modern TTL-based systems. The 28-pin LCC package provides a compact solution for dense PCB layouts requiring multiple translation channels.

Replacement Considerations

Check for direct pin-compatible substitutes within the same logic family. Verify if newer generations from ON Semiconductor offer equivalent bidirectional functionality with improved electrical specifications or updated packaging options.