LTC4309CGN#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4309CGN#PBF 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 backplane and card capacitances. The device operates with supply voltages (VCC) ranging from 2.3V to 5.5V and input side 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 and functions within an operating temperature range of 0°C to 70°C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Prevents data and clock bus corruption during live board insertion and removal
• Provides level shifting capability between 2.5V, 3.3V, and 5V busses
• Includes optional disconnect functionality when the bus is detected as stuck low
• Features rise time accelerators to support 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 matches the required package type and temperature grade. Confirm that the lead-free finish aligns with environmental compliance requirements. Ensure the pin configuration corresponds to the 16-lead SSOP format before finalizing procurement orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when isolation between backplane and card capacitances is required. Consider the VCC and VCC2 supply voltage ranges to ensure compatibility with system power rails. Evaluate the need for automatic bus recovery features versus manual control via the DISCEN pin based on system fault tolerance requirements.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4304/LTC4305/LTC4309 family of hot swappable bus buffers. While sharing similar interface protocols, the LTC4309 specifically offers level shifting and low offset characteristics suitable for cascading multiple devices. It differs from multiplexer variants by providing dedicated bidirectional buffering rather than switching capabilities.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Consult manufacturer documentation for direct substitutes. Verify functional equivalence regarding bus isolation, voltage levels, and package dimensions if considering alternative components.