TDP20MB421IRUAT

Overview

The TDP20MB421 is a four-channel linear redriver with an integrated 2:1 multiplexer, designed for DisplayPort 2.1 and AC-coupled HDMI 2.1 applications. It supports data rates up to 24 Gbps per channel, accommodating UHBRx modes for DP 2.1 and 12Gbps for HDMI 2.1. The device operates on a single 3.3V supply, consuming 720mW in active mode across all channels. Key electrical specifications include a propagation delay of 90 ps, 19dB equalization boost at 10GHz, and low additive random jitter of 70fs. It features configurable CTLE settings via pin control or SMBus/I2C interface.

Feature Summary

• Integrates a 2:1 multiplexer to select between two source ports for four independent signal channels.
• Employs continuous time linear equalizers (CTLE) to compensate for high-frequency loss in passive interconnects.
• Supports configuration through strap pins or an SMBus/I2C secondary interface for flexible system integration.
• Maintains transparency to DisplayPort and HDMI link training protocols while preserving transmit preset characteristics.

Applications

• Desktop PC and motherboard display interfaces
• PC, notebooks, and tablets with external display connectivity
• Docking stations requiring signal extension
• TV, gaming consoles, and home theater entertainment systems

Procurement Notes

Verify the specific ordering suffix RUAT corresponds to the WQFN-42 package variant when sourcing. Confirm that the I2C pull-up resistor values align with the bus capacitance requirements specified in the datasheet. Ensure the design accounts for the exposed pad thermal connection to maintain junction temperature within recommended operating limits during high-speed operation.

Selection Notes

Select this component for designs requiring protocol-agnostic linear redriving up to 24Gbps. The integrated 2:1 MUX simplifies switching logic between dual video sources. Consider the 5-level input pin architecture for hardware-based configuration if software control is unavailable. Verify that the PCB trace length necessitates the 19dB EQ boost capability provided by the maximum setting.

Part Context

The TDP20MB421 belongs to Texas Instruments' family of high-speed interface redrivers. It complements other signal integrity solutions by providing both amplification and source selection in a single package. The device addresses the increasing bandwidth demands of next-generation display standards like DisplayPort 2.1 and HDMI 2.1.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate alternative TI redrivers based on channel count and supported data rates if substitution is required.

FAQ

How is the device configured for SMBus/I2C control?

Configuration requires setting the MODE pin to L2. The ADDR pin then determines the 7-bit secondary address for the respective channel banks, allowing an external controller to write to shared and channel-specific registers.

What is the maximum equalization boost provided by the CTLE?

The receiver CTLE provides up to 19dB of equalization boost at 10GHz when set to the maximum index (EQ Index 19), compensating for significant insertion loss in the transmission channel.

Does the device support HDMI 2.1 signals?

Yes, the TDP20MB421 supports AC-coupled HDMI 2.1 Source signals up to 12Gbps, in addition to DisplayPort 2.1 signals up to 20Gbps.