LTC4304IMS#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4304IMS#PBF is a hot swappable 2-wire bus buffer designed for I/O card insertion into live backplanes without data corruption. It provides bidirectional buffering for SDA and SCL lines, isolating backplane and card capacitances. The device features automatic stuck bus recovery by generating up to 16 clock pulses if the bus remains low for ≥30ms. It supports I²C, Fast-Mode, and SMBus standards with operation up to 400kHz. Key electrical parameters include a supply voltage range of 2.7V to 5.5V, a typical precharge voltage of 1V on all SDA/SCL lines, and ±15kV Human Body Model ESD protection. The component is housed in a 10-lead MSOP package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Automatic disconnection and fault flagging when the bus is stuck low for extended periods
• Bidirectional buffering that increases fanout while isolating input and output capacitances
• Prevents signal corruption during live board insertion and removal from backplanes
• Allows bus pull-up voltages to operate above or below the VCC supply level

Signal Buffers, Repeaters, Splitters Applications

• Servers
• RAID Systems
• Hot Board Insertion
• Capacitance Buffer/Bus Extender

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and standard tube packaging. Confirm the IMS designation corresponds to the industrial temperature grade (-40°C to +85°C). Ensure the ordering information matches the exact manufacturer part number to avoid functional discrepancies related to package type or thermal rating.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component for applications requiring isolation between backplane and card-side I2C buses during hot swapping. It is suitable for systems needing automatic recovery from stuck bus conditions without external microcontroller intervention. Consider the MSOP package constraints and ensure the system rise times meet the accelerator activation requirements.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4304 family of hot swappable 2-wire bus buffers. It shares functionality with variants like the LTC4304CDD but differs in operating temperature range and package style. The IMS variant specifically utilizes the MSOP-10 package, distinguishing it from the DFN-based counterparts within the same product line.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4304CMS#PBF

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4304 handle a stuck bus condition?

If SDAOUT or SCLOUT is low for ≥30ms, the device breaks the connection, pulls FAULT low, and automatically generates up to 16 clock pulses on SCLOUT to attempt to free the bus.

What is the function of the ACC pin?

The ACC pin controls the rise-time accelerators. A logic low enables them, while a logic high disables them, allowing SDA and SCL bus pull-up voltages to be lower than VCC.

Does the device support different voltage levels for input and output?

Yes, the LTC4304 allows bus pull-up voltages above and below VCC, making it compatible with supply-independent applications where backplane and card voltages differ.