LTC4300A-1CMS8#TRPBF

Overview

The LTC4300A-1CMS8#TRPBF is a hot swappable 2-wire bus buffer manufactured by Analog Devices Inc. It operates within a supply voltage range of 2.7V to 5.5V and supports data rates up to 400kHz. The device features bidirectional buffering for SDA and SCL lines, isolating backplane and card capacitances during live insertion. It includes rise-time accelerator circuitry that provides transient boosted pull-up currents to meet timing requirements with weaker DC pull-ups. The part incorporates a CMOS threshold ENABLE input for low current shutdown (<1μA) and an open-drain READY output indicating connection status. It is housed in an 8-lead plastic MSOP package.

Feature Summary

• Provides bidirectional buffering while isolating backplane and card capacitances during live board insertion
• Features rise-time accelerator circuitry allowing the use of weaker DC pull-up currents
• Includes precharge circuitry to minimize bus disturbances during connection
• Offers low current chip disable mode via digital CMOS threshold input

Applications

• Bidirectional buffer for SDA and SCL lines to increase fanout
• Preventing SDA and SCL corruption during live board insertion and removal from backplane
• Capacitance buffering and bus extending applications
• Servers and desktop computer I/O card interfaces

Procurement Notes

Verify the specific suffix CMS8 corresponds to the commercial temperature range (0°C to 70°C) and TRPBF indicates tape and reel packaging. Confirm lead-free finish compliance and ensure the ordering information matches the required package type and operating conditions before finalizing procurement.

Selection Notes

Select this component when hot swapping capabilities are required for 2-wire buses. Ensure the system operates within the 2.7V to 5.5V supply range. Verify that the commercial temperature range meets environmental requirements. Consider the ENABLE pin functionality for power management if lower standby current is needed compared to fixed supply variants.

Part Context

This part belongs to the LTC4300A series of hot swappable 2-wire bus buffers. It is distinct from the LTC4300A-2 variant, which replaces the ENABLE pin with a dedicated VCC2 supply pin for level shifting between different voltage systems. The LTC4300A-1 retains the READY output flag for connection status indication.

Replacement Considerations

LTC4300A-1IMS8#TRPBF offers the same electrical functions but supports an extended industrial temperature range (-40°C to 85°C). LTC4300A-2CMS8#TRPBF provides level shifting capabilities but lacks the ENABLE and READY pins.