LTC4309IDE#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4309IDE#PBF is a hot swappable 2-wire bus buffer manufactured by Analog Devices Inc. It supports I2C, SMBus, and I2C Fast-Mode protocols with a maximum operating frequency of 600 kHz. The device operates within an input voltage range of 2.3 V to 5.5 V for VCC and 1.8 V to 5.5 V for VCC2. It features a typical supply current of 71 mA when enabled and 900 µA when disabled at 5.5 V. The component provides bidirectional buffering with a low offset voltage of 60 mV and includes rise time accelerators controlled via the ACC pin. It utilizes a 12-lead DFN (4mm x 3mm) package and functions across an industrial temperature range of -40°C to +85°C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Prevents data corruption during live board insertion through 1V precharge circuitry on SDA and SCL lines
• Provides automatic stuck bus recovery by generating clock pulses and stop bits when DISCEN is active
• Isolates backplane and card capacitances while allowing cascading of multiple devices via low offset design
• Features optional rise time accelerators to support high capacitively loaded busses

Signal Buffers, Repeaters, Splitters Applications

• Servers requiring hot swappable I/O card insertion
• RAID systems needing bus isolation and fault recovery
• AdvancedTCA (ATCA) backplane interfaces
• Capacitance buffering and bus extending applications

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature grade. Ensure the procurement channel sources genuine components from authorized distributors or the manufacturer directly. Cross-reference the part marking with the datasheet specifications to validate authenticity before integration into production systems.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this model for applications requiring robust protection against bus stuck-low conditions and live insertion events. The IDE suffix indicates suitability for the -40°C to +85°C industrial temperature range. Consider the 12-lead DFN package for space-constrained designs where thermal performance and compact footprint are prioritized over alternative SSOP options.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4309 family of hot swappable 2-wire bus buffers designed by Analog Devices. It serves as a specialized interface solution for isolating system buses during maintenance or expansion. The device ensures protocol compliance while managing electrical disturbances associated with connecting and disconnecting peripheral cards in active environments.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4309CGN#PBF: Same function with commercial temperature range (0°C to 70°C).

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4309 prevent bus corruption during live insertion?

It uses a 1V precharge circuit that forces the SDA and SCL pins to 1V before contact, minimizing voltage differentials and disturbances.

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

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

Can the LTC4309 be used to extend bus length?

Yes, it can isolate capacitance between segments, allowing two systems separated by distance to connect effectively without violating rise/fall time specifications.