LTC4313IDD-2#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4313IDD-2#TRPBF is a hot swappable 2-wire bus buffer from Analog Devices, operating within an industrial temperature range of -40°C to 85°C. It provides bidirectional buffering for I2C and SMBus signals with a high noise margin defined by VIL = 0.3 • VCC. The device supports level translation between 3.3V and 5V busses and operates on a supply voltage (VCC) ranging from 2.9V to 5.5V. It features a 2.5mA rise time accelerator current source to meet rise time specifications in heavily loaded systems. The component includes automatic stuck bus disconnect and recovery logic, precharging SDA and SCL lines to 1V during insertion to minimize bus disturbances. It is housed in an 8-lead (3mm × 3mm) plastic DFN package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Provides bidirectional buffering with high noise margin for interoperability with non-compliant I2C devices
• Includes 2.5mA rise time accelerator current sources to reduce bus rise times in heavily loaded systems
• Features automatic stuck bus disconnect and recovery logic generating up to sixteen clock pulses
• Precharges SDA and SCL pins to 1V during live board insertion to prevent bus corruption

Signal Buffers, Repeaters, Splitters Applications

• Bidirectional buffering to increase fanout in I2C networks
• Live board insertion and removal from backplanes in telecommunications systems
• Level translation between 3.3V and 5V busses
• Capacitance buffering and bus extending in servers and PMBus applications

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix #TRPBF confirms tape and reel packaging rather than tube packaging when sourcing components. Confirm the IDD suffix indicates the industrial temperature grade (-40°C to 85°C) required for your application environment. Ensure compatibility with the 8-lead DFN footprint and exposed pad thermal requirements during assembly.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this model over the LTC4313-1 variant if a fixed 2.5mA rise time accelerator current is preferred over the slew-limited switch mode. This part is suitable for systems requiring level translation specifically between 3.3V and 5V busses. Verify that the system bus capacitance and pull-up resistor values align with the RTA activation thresholds specified in the datasheet.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4313 family of 2-wire bus buffers designed for hot swap applications. The 'IDD' designation specifies the industrial temperature range and DFN package, while the '#TRPBF' suffix indicates tape and reel packaging with lead-free finish. It serves as a bridge between upstream and downstream bus segments, isolating capacitances and managing signal integrity during dynamic system changes.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4313CDD-2#TRPBF: Commercial temperature grade version (0°C to 70°C).

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4313 handle a stuck low bus condition?

If both data and clock are not simultaneously high at least once in 45ms, the input disconnects from the output. The device then generates up to sixteen clock pulses on the SCLOUT pin and a stop bit to attempt to free the stuck bus.

What is the function of the ENABLE pin during operation?

Driving ENABLE low isolates the input from the output and disables the rise time accelerators. Driving ENABLE high allows connection establishment after a stop bit or bus idle condition is detected on both SDA and SCL pins.

Why are SDA and SCL pins precharged to 1V?

During insertion, the precharge circuit forces a nominal 1V on the SDA and SCL pins to minimize disturbances to the live backplane bus before the card makes full electrical contact.