LTC4307CDD-1#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4307CDD-1#PBF is a bidirectional 2-wire bus buffer designed for HDMI Display Data Channel (DDC) applications. It provides capacitance buffering with sub-10pF input capacitance to meet the HDMI specification requirement of less than 50pD on DDC lines. The device performs level translation between 3.3V and 5V systems, allowing lower voltage components to interface with the 5V DDC bus. It features a 60mV buffer offset independent of load and ±5kV Human Body Model ESD protection. The part operates within a supply voltage range of 2.3V to 5.5V and supports I²C, I²C Fast Mode, and SMBus protocols. It is housed in an 8-lead (3mm × 3mm) Plastic DFN package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Capacitance buffering isolates internal bus capacitance from HDMI connector requirements
• Level shifting enables communication between 3.3V and 5V DDC busses
• READY open-drain output indicates connection status for HPD control

Signal Buffers, Repeaters, Splitters Applications

• HDMI receiver channels for capacitance buffering
• HDMI transmitter channels for capacitance buffering
• Level shifting between 3.3V EEPROMs and 5V DDC buses

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. The C suffix denotes commercial temperature range (0°C to 70°C). Confirm lead-free finish compliance if required by assembly specifications. Ensure the DFN package footprint aligns with PCB layout guidelines provided in the datasheet.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when HDMI DDC capacitance limits must be met without adding external buffers. Choose the C variant for standard commercial environments. Consider the IDD-1 variant if operation below 0°C is required. Verify that the system does not require hot-swappable bus recovery features, as these are excluded in the -1 version.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4307-1 family, which is optimized specifically for HDMI applications compared to the general-purpose LTC4307. Key differences include the removal of stuck bus disconnect/recovery and rise time accelerators, while adding level-shifting functionality. This specialization ensures compliance with HDMI Specification Version 1.3 DDC capacitance requirements.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4307IDD-1#PBF offers the same functionality with an extended industrial temperature range (-40°C to 85°C). LTC4307CMS8-1#PBF provides identical electrical performance in an 8-Lead Plastic MSOP package.