SN74FB1650PCA

Specialty Logic Overview

The SN74FB1650PCA is a dual 9-bit TTL-to-BTL transceiver designed for backplane applications. It operates at VCC = 5V (4.5-5.5V) with an operating temperature range of 0°C to 70°C. The device features open-collector B-port outputs capable of sinking 100 mA and includes dedicated BIAS VCC, BG VCC, and BG GND pins to precondition connectors during live insertion. It supports clocked data storage via LEAB/CLKAB and LEBA/CLKBA inputs, ensuring high-impedance states during power-up/down.

Specialty Logic Feature Summary

• Supports IEEE Std 1194.1-1991 compatibility for backplane environments
• Includes biasing networks to minimize signal distortion during live insertion or withdrawal
• Features active clamping on TTL-input structures to aid in line termination
• Maintains high-impedance state on A-port outputs during power-up and power-down

Specialty Logic Applications

• Translating signals between TTL logic and backplane transceiver logic (BTL)
• Backplane systems requiring live insertion and removal capabilities
• High-speed digital interconnects utilizing clocked data storage

Specialty Logic Procurement Notes

Verify the specific package marking 'FB1650' and confirm the PCA plastic quad flatpack housing matches the design requirements. Ensure that the system design accommodates the required external bias generator connections for BIAS VCC, BG VCC, and BG GND to properly support the BTL interface levels and live-insertion specifications.

Specialty Logic Selection Notes

Select this component when interfacing standard TTL circuits with BTL backplane standards. It is suitable for designs requiring robust current sinking on the B-side and precise timing control through separate clock and latch inputs for both directions of data transfer.

Specialty Logic Part Context

This part belongs to the SN74FB series of high-speed bus transceivers. It provides bidirectional data translation specifically engineered for mixed-voltage environments where TTL devices must communicate with BTL-compliant backplane architectures.

Specialty Logic Replacement Considerations

Check for SN74FB1650 variants with different suffixes or packages from Texas Instruments that maintain the same functional pinout and electrical characteristics.