LTC4300-2IMS8#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4300-2IMS8#TRPBF is a hot swappable 2-wire bus buffer designed for I2C and SMBus applications. It supports bidirectional buffering with supply voltages ranging from 2.7V to 5.5V on both VCC and VCC2 pins, enabling level shifting between 3.3V and 5V systems without voltage constraints. The device features rise time accelerator circuitry that provides up to 2mA of transient boost current to meet signal integrity requirements while allowing weaker DC pull-ups. It includes a 1V precharge function to minimize bus disturbances during live insertion. Operating frequencies are guaranteed up to 400kHz, with a typical propagation delay skew of ±75ns. The component is housed in an 8-lead MSOP package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering for SDA and SCL lines while isolating backplane and card capacitances.
• Enables hot swapping by precharging SDA and SCL lines to 1V before connection to minimize data corruption.
• Features integrated rise time accelerators that inject transient current to maintain signal slew rates with lower DC pull-up currents.
• Supports level translation between disparate supply voltages (e.g., 5V backplane to 3.3V card) via independent VCC and VCC2 supplies.

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffering for I2C and SMBus SDA and SCL lines
• Hot board insertion into live backplanes
• Capacitance buffering and bus extension
• Level translation between 5V and 3.3V systems

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when ordering. Confirm the IMS8 variant corresponds to the industrial temperature range of -40°C to +85°C. Ensure the design accounts for the distinct pinout differences between the LTC4300-1 and LTC4300-2 models, particularly regarding the ENABLE versus VCC2/ACC pin configurations.

Signal Buffers, Repeaters, Splitters Selection Notes

Select the LTC4300-2 over the LTC4300-1 when independent supply rails are required for the backplane and card sides, or when level shifting between different voltage domains is necessary. The ACC pin allows external control of the rise time accelerators, which is useful for lightly loaded buses. Ensure the system pull-up resistors are selected to provide a positive slew rate of at least 1.25V/µs to activate the boost currents effectively.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4300 series of hot swappable 2-wire bus buffers manufactured by Analog Devices Inc. The series includes variants like the LTC4300-1, which uses an ENABLE pin for low-current shutdown, and the LTC4300-2, which utilizes separate VCC and VCC2 supplies for level shifting capabilities. The family is designed to protect I2C and SMBus networks during live insertion events.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The LTC4300-1IMS8#TRPBF is a functional substitute if level shifting is not required and an ENABLE pin is preferred. Other members of the LTC4300 family may be considered based on specific temperature ranges or package availability, but pin compatibility must be verified due to differences between the -1 and -2 variants.