LTC4300A-2IMS8#PBF

Overview

The LTC4300A-2IMS8#PBF 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 backplane and card sides, isolating capacitances. The device features rise-time accelerator circuitry to maintain signal integrity with weaker pull-ups. It supports level shifting between 3.3V and 5V systems via separate VCC and VCC2 supplies (2.7V to 5.5V). Operating frequency reaches 400kHz with a propagation delay of 75ns. Input capacitance is 10pF. It operates from -40°C to +85°C in an 8-lead MSOP package.

Feature Summary

• Hot swappable 2-wire bus buffering prevents SDA and SCL corruption during live board insertion
• Rise-time accelerator circuitry enables use of weaker DC pull-up currents while meeting timing requirements
• SDA and SCL lines are precharged to 1V during insertion to minimize bus disturbances
• Provides level shifting between 3.3V and 5V systems using dedicated VCC2 supply pin

Applications

• Bidirectional buffer for SDA and SCL lines to increase fanout
• Servers and desktop computers requiring hot board insertion capabilities
• Capacitance buffering and bus extending applications

Procurement Notes

Verify the specific IMS8 suffix indicates the industrial temperature range (-40°C to +85°C) rather than commercial grade. Confirm the #PBF designation ensures lead-free compliance and RoHS adherence as per manufacturer standards. Cross-reference the datasheet revision date to ensure compatibility with current design specifications before finalizing procurement orders.

Selection Notes

Select this model over the LTC4300A-1 variant when independent control of the card-side supply voltage is required or when level shifting between disparate voltage domains is necessary. The ACC pin allows external disabling of rise-time accelerators for lightly loaded systems. Ensure the application does not require the READY status flag, which is exclusive to the A-1 version.

Part Context

This component belongs to the LTC4300A series of hot swappable 2-wire bus buffers manufactured by Analog Devices. It shares the core buffering and acceleration architecture with the LTC4300A-1 but replaces the ENABLE and READY pins with a dedicated VCC2 supply and ACC input respectively. This variation facilitates integration into systems with mixed voltage levels.

Replacement Considerations

LTC4300A-1IMS8#PBF serves as a functional substitute if level shifting is unnecessary and the READY output flag is required instead of the ACC input.