LTC4300A-3CDD#TRPBF

Overview

The LTC4300A-3CDD#TRPBF is a hot swappable 2-wire bus buffer manufactured by Analog Devices Inc. It supports bidirectional buffering for SDA and SCL lines, allowing I/O card insertion into live backplanes without data corruption. The device operates with supply voltages (VCC and VCC2) ranging from 2.7V to 5.5V and supports frequencies up to 400kHz. It features a 1V precharge circuit to minimize bus disturbances during connection and includes rise time accelerators that provide approximately 2mA of transient boost current. The part is housed in an 8-lead (3mm × 3mm) plastic DFN package and operates within a temperature range of 0°C to 70°C.

Feature Summary

• Provides bidirectional buffering while isolating backplane and card capacitances to prevent signal corruption during live board insertion.
• Incorporates a 1V precharge mechanism on SDA and SCL lines to minimize voltage differentials and disturbances at the moment of connection.
• Features rise time accelerator circuitry that supplies transient boost current to meet system rise time requirements with weaker DC pull-ups.
• Includes a CMOS threshold ENABLE pin that forces the device into a low current mode and isolates the card from the backplane when grounded.

Applications

• Hot board insertion for I/O cards into live backplanes
• Servers requiring safe I2C or SMBus connectivity
• Capacitance buffering and bus extension applications
• Desktop computer peripheral interfaces

Procurement Notes

Verify the specific ordering suffix #TRPBF indicates tape and reel packaging. Confirm the C suffix corresponds to the commercial temperature range of 0°C to 70°C. Ensure the DDD package designation matches the required 8-lead (3mm × 3mm) plastic DFN footprint for your PCB layout.

Selection Notes

Select this component when designing systems that require hot swapping capabilities for 2-wire buses. Ensure the design accommodates separate VCC and VCC2 supplies within the 2.7V to 5.5V range if level translation between different logic voltages is needed. Verify that the pull-up resistor values allow the bus to achieve a positive slew rate of at least 1.25V/µs to activate the rise time accelerators effectively.

Part Context

This part belongs to the LTC4300A family of hot swappable 2-wire bus buffers. It shares functional similarities with the LTC4300A-1 and LTC4300A-2 but is distinguished by its specific package type and temperature grade. The device is designed to work alongside other interface components like the LTC4301 or LTC4302 to manage complex bus topologies safely.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices marketing for parts specified with wider operating temperature ranges or alternative package options such as MSOP.