LTC4304CDD#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4304CDD#PBF is a hot swappable 2-wire bus buffer designed for I/O card insertion into live backplanes. It provides bidirectional buffering for SDA and SCL lines, isolating backplane and card capacitances to prevent data corruption. The device features automatic stuck bus recovery by generating up to 16 clock pulses if the bus remains low for 30ms. It supports I2C, 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, typical supply current of 8mA, and input capacitance of 10pF. It offers ±15kV HBM ESD protection and includes an ENABLE pin for connection control.

Signal Buffers, Repeaters, Splitters Feature Summary

• Automatic disconnection and recovery from stuck bus conditions via internal timer and clock generation
• Bidirectional buffering that isolates backplane and card capacitances during live insertion
• Rise-time accelerators to support high bus capacitance or large pull-up resistors
• Supply independent operation allowing bus voltages above or below VCC

Signal Buffers, Repeaters, Splitters Applications

• Hot board insertion in CompactPCI systems
• Servers requiring live I/O card replacement
• RAID systems needing bus isolation
• Capacitance buffering and bus extension

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix #PBF confirms lead-free compliance and RoHS status as per manufacturer documentation. Confirm the DD package designation matches the required 10-lead DFN (3mm x 3mm) footprint for PCB layout compatibility. Ensure the C grade temperature rating aligns with the operational environment requirements before finalizing procurement orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when hot swapping capabilities and automatic stuck bus recovery are required for 2-wire buses. It is suitable for applications where backplane and card capacitances must be isolated to maintain signal integrity. Consider the rise-time accelerator feature if the system utilizes large pull-up resistors or exceeds standard bus capacitance limits defined by I2C specifications.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4304 family of hot swappable bus buffers. It is distinct from variants like the LTC4308 which offer level shifting, or the LTC4307 designed for HDMI DDC. The CDD suffix indicates the commercial temperature range and the specific DFN package type. It serves as a specialized interface solution for maintaining bus stability during dynamic hardware configuration changes.

Signal Buffers, Repeaters, Splitters Replacement Considerations

Public confirmed substitutes include other parts within the Analog Devices LTC430x series such as the LTC4300A or LTC4301, provided they meet the specific hot swap and isolation requirements. Verify pinout compatibility and functional equivalence regarding stuck bus recovery mechanisms before substitution.