LTC4313CDD-3#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4313CDD-3#TRPBF is a hot swappable 2-wire bus buffer from Analog Devices, designed for I2C and SMBus applications. It provides bidirectional buffering with high noise margin (VIL = 0.3•VCC) and supports level translation to 1.5V, 1.8V, and 2.5V busses in addition to 3.3V and 5V. The device operates within a supply voltage range of 2.9V to 5.5V for VCC and 1.4V to 5.5V for the bus. Key electrical parameters include a maximum clock frequency of 400 kHz, input capacitance of 10 pF, and typical propagation delay of 130 ns. It features precharge circuitry to minimize bus disturbances during insertion.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering for 2-wire buses while maintaining high noise margin up to 0.3 • VCC
• Supports level translation between 3.3V/5V busses and lower voltages including 1.5V, 1.8V, and 2.5V
• Pre-charges SDA and SCL lines to 1V during insertion to minimize bus disturbances
• Includes stuck bus disconnect and recovery logic that generates clock pulses to free stuck buses

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffer to increase fanout on I2C/SMBus networks
• Live board insertion and removal from backplanes without corruption
• Level translation between different voltage domains (e.g., 3.3V to 1.8V)
• Telecommunications systems such as ATCA where capacitance buffering is required

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm the temperature grade 'C' corresponds to the commercial range of 0°C to 70°C. Ensure the DFN package dimensions match the design constraints. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm availability and lead times before finalizing procurement plans.

Signal Buffers, Repeaters, Splitters Selection Notes

Select the LTC4313CDD-3 variant specifically when level translation to sub-3V buses like 1.8V or 1.5V is required, as opposed to the -1 or -2 variants which are optimized for 3.3V/5V. Note that this version lacks Rise Time Accelerators (RTAs), so external pull-up resistor values must be calculated based on bus capacitance to meet rise time specifications. Verify that the system does not require the strong pull-up currents provided by the RTA features found in other family members.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4313 family of 2-wire bus buffers manufactured by Analog Devices. It shares the same pinout and core functionality with the LTC4313-1 and LTC4313-2 but differs in its support for lower voltage levels and the absence of internal rise time accelerators. The CDD-3 designation specifies the commercial temperature range and the 8-lead DFN package configuration.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4313CDD-3#PBF is the tube-packaged equivalent of this part. For designs requiring rise time acceleration, consider the LTC4313CDD-2#TRPBF, though it lacks support for 1.5V/1.8V translation. The LTC4313CDD-1#TRPBF offers stronger RTA currents but also lacks low-voltage support.