LTC4300A-2IMS8#TRPBF

Overview

The LTC4300A-2IMS8#TRPBF is a hot swappable 2-wire bus buffer designed for I/O card insertion into live backplanes without data corruption. It provides bidirectional buffering between SDA and SCL lines, isolating backplane and card capacitances. The device features rise-time accelerator circuitry to support weaker DC pull-up currents while meeting timing requirements. It includes a dedicated VCC2 supply pin for level shifting between 3.3V and 5V systems. Both VCC and VCC2 operate from 2.7V to 5.5V. The part operates within a temperature range of -40°C to +85°C and is housed in an 8-lead MSOP package.

Feature Summary

• Hot swappable 2-wire bus buffering with isolation of input-output capacitances
• Rise-time accelerator circuitry for improved signal slew rates
• Dedicated VCC2 supply pin enabling level translation between disparate voltage domains
• 1V precharge on SDA and SCL lines to minimize bus disturbances during insertion

Applications

• Bidirectional buffering for SDA and SCL lines in I2C and SMBus systems
• Preventing bus corruption during live board insertion and removal from backplanes
• Level translation between 3.3V and 5V systems
• Servers and desktop computer backplane interfaces

Procurement Notes

Verify the specific IMS8 suffix indicates the industrial temperature grade (-40°C to +85°C) and the TRPBF suffix denotes tape and reel packaging. Confirm RoHS compliance status through official manufacturer documentation prior to integration. Ensure the component matches the exact Analog Devices Inc. part number to guarantee electrical characteristics and pinout compatibility.

Selection Notes

Select the LTC4300A-2 variant over the A-1 when independent supply voltages are required for the backplane and card sides, or when level shifting between different logic levels is necessary. The ACC pin allows external control of the rise-time accelerators. Verify that the system's bus capacitance and pull-up resistor values align with the accelerator activation thresholds defined in the datasheet.

Part Context

This component belongs to the LTC4300A series of hot swappable 2-wire bus buffers manufactured by Analog Devices Inc. The series includes variants like the LTC4300A-1 which uses an ENABLE pin for low-current shutdown instead of a second supply rail. The IMS8 designation specifies the plastic MSOP package with industrial temperature rating.

Replacement Considerations

LTC4300A-1IMS8#TRPBF serves as a functional substitute if the system does not require independent VCC2 power or level shifting, utilizing the ENABLE pin for control instead.