LTC4313IDD-3#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4313IDD-3#PBF is a hot swappable 2-wire bus buffer designed for I2C, SMBus, and PMBus applications. It provides bidirectional buffering with high noise margin (VIL = 0.3•VCC) and supports level translation between 3.3V and lower voltages including 1.5V, 1.8V, and 2.5V. The device operates with a supply voltage range of 2.9V to 5.5V and supports clock frequencies up to 400kHz. Key electrical characteristics include an input supply current of typically 8.1mA, input capacitance of 10pF, and ±4kV HBM ESD ruggedness. It features precharge circuitry to minimize bus disturbances during insertion and automatic stuck bus recovery.

Signal Buffers, Repeaters, Splitters Feature Summary

• Supports level translation to 1.5V, 1.8V, and 2.5V busses in addition to 3.3V and 5V
• Provides high noise margin compatible with non-compliant I2C devices driving high VOL
• Includes precharge circuitry to minimize bus disturbances during live board insertion
• Features automatic stuck bus disconnect and recovery logic

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffering to increase fanout on I2C/SMBus networks
• Live board insertion and removal from backplanes in telecommunications systems
• Level translation between different voltage domains (e.g., 3.3V to 1.8V)
• Capacitance buffering for bus extenders in ATCA and server architectures

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix #PBF indicates lead-free packaging when sourcing. Confirm the IDD suffix corresponds to the industrial temperature range of –40°C to 85°C. Ensure the DFN package dimensions match the design footprint. Check for RoHS compliance documentation if required by local regulations. Validate that the supplier provides genuine Analog Devices components to avoid counterfeit risks.

Signal Buffers, Repeaters, Splitters Selection Notes

Select the LTC4313-3 variant specifically when level translation to voltages below 2.9V, such as 1.8V or 1.5V, is required. Unlike the -1 and -2 variants, this version does not include Rise Time Accelerators (RTAs), making it suitable for applications where RTA functionality is unnecessary or potentially disruptive. Ensure the bus supply voltage meets the minimum requirements defined by the VIL threshold equation for stable operation at lower voltages.

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 architecture as the LTC4313-1 and LTC4313-2 but differs in its level translation capabilities and absence of rise time accelerators. The family is designed for hot swap applications, providing robust protection against bus corruption during card insertion and removal in complex multi-master environments.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4313CDD-3#PBF: Commercial grade version with 0°C to 70°C operating temperature range.