LTC4300A-3CMS8#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4300A-3CMS8#TRPBF is a hot swappable 2-wire bus buffer manufactured by Analog Devices Inc. in an 8-lead MSOP package. It supports bidirectional buffering for SDA and SCL lines with operation up to 400 kHz. The device provides level translation between VCC and VCC2 supplies ranging from 2.7V to 5.5V. Electrical characteristics include a precharge voltage of 1V, shutdown supply current of 20 µA, and typical operating currents of 4.1 mA (VCC) and 2.9 mA (VCC2). It operates within a temperature range of 0°C to 70°C.

Signal Buffers, Repeaters, Splitters Feature Summary

• Hot swap controller isolates backplane and card capacitances during live insertion
• Rise time accelerator circuitry enables use of weaker DC pull-up currents
• SDA and SCL lines are precharged to 1V to minimize bus disturbances
• CMOS threshold ENABLE pin forces low current mode and isolates the card

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffer for SDA and SCL lines
• Servers and desktop computer I/O card insertion
• Capacitance buffer and bus extender
• Level shifting between 3.3V and 5V supplies

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix CMS8 corresponds to the MSOP package and commercial temperature grade. Confirm RoHS compliance status through official documentation. Ensure ordering information matches the required lead-free finish and tape and reel specifications provided by the manufacturer.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when hot swapping capability and capacitance isolation are required for I2C or SMBus systems. Verify that the system rise times meet the 1.25V/µs activation requirement for the boost circuitry. Ensure supply voltages remain within the 2.7V to 5.5V range for both VCC and VCC2 pins.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4300A family of hot swappable 2-wire bus buffers. Variants such as LTC4300A-1 and LTC4300A-2 offer similar buffering features but may differ in addressability or specific interface control mechanisms. The A-series designation indicates enhanced performance characteristics over previous generations.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4300A-1IMS8#TRPBF and LTC4300A-2IMS8#TRPBF are related parts within the same family offering comparable hot swap and buffering functions. Verify functional equivalence regarding enable logic and level shifting requirements before substitution.

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4300A-3 handle live board insertion?

It uses a start-up circuit that waits for a stop bit or bus idle condition before connecting the input and output buses, preventing data corruption.

What is the function of the ENABLE pin?

Grounding the ENABLE pin disconnects the backplane from the card, disables accelerators, and puts the device in a low current state. Driving it to VCC enables normal operation.

How does the rise time accelerator work?

During positive transitions, the device switches in approximately 2mA of current to quickly slew the SDA and SCL lines once their DC voltages exceed 0.6V.