LTC4307IDD-1#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4307IDD-1#TRPBF is a bidirectional 2-wire bus buffer designed for High Definition Multimedia Interface (HDMI) Display Data Channel (DDC) applications. It provides capacitance buffering and level translation between 3.3V and 5V systems. The device features sub-10pF input capacitance to meet HDMI DDC requirements, ±5kV HBM ESD protection, and a READY open-drain output for hot plug detect control. Operating voltage ranges from 2.3V to 5.5V with a typical supply current of 81µA at 5.5V. It supports I²C Fast Mode up to 600kHz and operates within a temperature range of –40°C to 85°C in an 8-lead DFN package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Capacitance buffering isolates internal bus capacitance from the HDMI connector to ensure compliance with the 50pD DC specification.
• Level shifting enables safe communication between 3.3V devices and 5V DDC buses without requiring additional components.
• READY digital output indicates connection status and can control the HDMI hot plug detect signal to prevent erroneous source attempts.

Signal Buffers, Repeaters, Splitters Applications

• HDMI receiver channels for capacitance buffering and level shifting
• HDMI transmitter channels for DDC signal integrity
• Systems requiring isolation between high-capacitance internal buses and HDMI ports

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the ordering suffix #TRPBF confirms tape and reel packaging rather than tube. Confirm the IDD-1 designation matches the required industrial temperature range of –40°C to 85°C. Ensure the specific lot traceability meets project requirements before finalizing procurement orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this part when HDMI DDC capacitance compliance is critical and level shifting between 3.3V and 5V domains is necessary. It is suitable for designs requiring hot plug detect control via the READY pin. Consider the exposed pad thermal performance if operating near maximum temperature limits.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4307-1 family, specifically optimized for HDMI applications compared to the general-purpose LTC4307. It lacks stuck bus recovery but includes level shifting. The IDD-1 variant specifies the industrial temperature grade and DFN-8 package configuration.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4307CDD-1#TRPBF offers identical functionality with a commercial temperature range (0°C to 70°C). Verify that the reduced temperature range meets system environmental requirements before substitution.

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4307-1 handle HDMI hot plug detect?

The READY pin pulls low when ENABLE is low or during startup. It goes high only after VCC rises above UVLO thresholds and both busses are idle, allowing it to control the HPD signal safely.

What is the maximum operating frequency supported?

The device supports I²C Fast Mode with a maximum operating frequency of 600kHz under specified conditions.

Does the device support hot swapping on the DDC lines?

No, the LTC4307-1 is not designed for hot-swapping DDC lines as it lacks pre-charge and stuck bus recovery features found in other variants like the LTC4307.