LTC4309CGN#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4309CGN#TRPBF is a hot swappable 2-wire bus buffer manufactured by Analog Devices Inc. It supports bidirectional buffering for I2C, SMBus, and Fast-Mode protocols while isolating input and output capacitances. The device operates with supply voltages (VCC) ranging from 2.3V to 5.5V and input accelerator supplies (VCC2) from 1.8V to 5.5V. It features a typical 60mV offset voltage independent of load, a 30ms bus stuck low timeout, and optional automatic disconnect with clock pulse generation. The component is housed in a 16-lead narrow plastic SSOP package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Prevents data and clock bus corruption during live board insertion and removal
• Provides bidirectional buffering to isolate backplane and card capacitances
• Includes automatic bus stuck low recovery with optional disconnect functionality
• Features rise time accelerators for high capacitively loaded buses

Signal Buffers, Repeaters, Splitters Applications

• Servers
• RAID Systems
• ATCA
• Live Board Insertion
• Capacitance Buffer/Bus Extender

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm that the CGN designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure compatibility with the required 16-lead SSOP footprint during procurement planning.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this model for applications requiring isolation between backplane and card-side I2C or SMBus lines. The CGN variant is suitable for commercial environments operating between 0°C and 70°C. Consider the 16-lead SSOP package constraints and verify that the system design accommodates the necessary pull-up resistor calculations for the rise time accelerators.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4309 family of hot swappable bus buffers designed for 2-wire communication systems. It serves as an interface solution for protecting sensitive bus lines during hardware changes. The device ensures signal integrity by managing capacitance differences and handling fault conditions automatically.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4309CGN#PBF

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4309 prevent bus corruption during live insertion?

It precharges the SDA and SCL lines to 1V before connection, minimizing voltage differentials and disturbances when the I/O card contacts the backplane.

What happens if the bus remains stuck low for more than 30ms?

The FAULT pin pulls low, and if DISCEN is tied high, the device breaks the connection and generates up to 16 clock pulses followed by a stop bit to attempt bus recovery.

Can multiple LTC4309 devices be cascaded on the same bus?

Yes, the low offset voltage and high VOL tolerance allow for cascading multiple devices on the clock and data busses.