LTC4300-2CMS8#TRPBF

Overview

The LTC4300-2CMS8#TRPBF is a hot swappable 2-wire bus buffer designed for I2C and SMBus applications. It supports bidirectional buffering with rise time accelerators, allowing the use of weaker DC pull-up currents while meeting timing requirements. The device features a 1V precharge circuit to minimize bus disturbances during insertion. It provides level shifting between 3.3V and 5V systems, supporting supply voltages from 2.7V to 5.5V on both VCC and VCC2 pins. Operating frequency reaches 400kHz, with propagation delay typically at 75ns. Input capacitance is 10pF. It is housed in an 8-lead MSOP package and operates within a commercial temperature range of 0°C to 70°C.

Feature Summary

• Hot swappable 2-wire bus buffering isolates backplane and card capacitances
• Rise time accelerator circuitry enables weaker DC pull-up currents
• Level shifting capability between 3.3V and 5V systems
• 1V precharge minimizes bus disturbances during live board insertion

Applications

• Bidirectional buffering for SDA and SCL lines
• Preventing data corruption during live board insertion and removal
• Servers and desktop computer hot swap applications
• Capacitance buffering and bus extending

Procurement Notes

Verify the specific suffix CMS8#TRPBF confirms the commercial temperature range (0°C to 70°C) and tape and reel packaging format. Ensure compatibility with the target system's voltage levels and bus capacitance requirements before finalizing procurement orders.

Selection Notes

Select this model when level shifting between disparate supply voltages is required. The LTC4300-2 variant replaces the ENABLE pin with a dedicated VCC2 supply pin, making it suitable for systems where the card side requires independent power control compared to the backplane.

Part Context

This component belongs to the LTC4300 series of hot swappable bus buffers. The -2 designation indicates the inclusion of a dedicated card-side supply pin (VCC2) and an ACC input for controlling rise time accelerators, distinguishing it from the -1 variant which uses an ENABLE pin.

Replacement Considerations

LTC4300-2IMS8#TRPBF offers the same functionality but with an extended industrial temperature range (-40°C to 85°C). Verify if the wider operating temperature range is necessary for the specific application environment.