LTC4300-1CMS8#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4300-1CMS8#PBF is a hot swappable 2-wire bus buffer designed for I2C, SMBus, and I2C Fast Mode applications. It supports bidirectional buffering with a supply voltage range of 2.7V to 5.5V and operates within a commercial temperature range of 0°C to 70°C. The device features a maximum operating frequency of 400kHz and includes a CMOS threshold ENABLE input pin that forces the part into a low current shutdown mode when driven to ground. It incorporates rise time accelerator circuitry to maintain signal integrity while allowing weaker DC pull-up currents.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering to isolate backplane and card capacitances during live board insertion
• Includes 1V precharge circuitry on SDA and SCL lines to minimize bus disturbances upon connection
• Features an open-drain READY output pin indicating successful connection between backplane and card sides
• Supports clock stretching, arbitration, and synchronization protocols

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffer for SDA and SCL lines in server systems
• Hot board insertion protection for I/O cards in backplanes
• Capacitance buffering and bus extension for desktop computers

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix CMS8 corresponds to the MSOP-8 package and the #PBF indicates lead-free compliance. Confirm the -1 variant designation matches the requirement for the ENABLE control pin rather than the VCC2 level-shifting configuration found in other series members. Ensure the commercial temperature grade aligns with system thermal constraints.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when designing systems requiring safe hot swapping of I/O cards without data corruption. The LTC4300-1 variant is appropriate for single-supply applications where an ENABLE pin controls power-down states. Verify that the system bus capacitance and pull-up resistor values fall within the recommended operating regions defined in the datasheet application graphs.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4300 series of hot swappable 2-wire bus buffers manufactured by Analog Devices Inc. The series includes variants like the LTC4300-2 which replaces the ENABLE pin with a dedicated VCC2 supply for level shifting. The -1 designation specifically denotes the version with the digital ENABLE input and READY output functionality.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4300-1IMS8#PBF offers the same functional specifications but covers an extended industrial temperature range of –40°C to 85°C compared to the commercial range of the CMS8 variant.