LTC4306IGN#TRPBF

Specialized Overview

The LTC4306IGN#TRPBF is a 4-channel, 2-wire bus multiplexer with bus buffers providing capacitive isolation between upstream and downstream buses. It operates on a single supply voltage (VCC) ranging from 2.7V to 5.5V. The device supports I2C and SMBus standards, featuring nested addressing via three address pins for 27 distinct addresses. Electrical characteristics include an input supply current of up to 8mA when downstream connected, and an ENABLE pin falling threshold voltage between 0.8V and 1.2V. The component is housed in a 24-lead SSOP package and is rated for an operating temperature range of -40°C to +85°C.

Specialized Feature Summary

• Provides capacitive isolation between upstream and downstream 2-wire buses using bidirectional buffer circuitry.
• Features programmable timeout circuitry that automatically disconnects downstream buses if the bus remains stuck low.
• Includes rise time accelerator circuitry to source currents into bus pins, reducing signal rise times on heavily loaded lines.
• Supports SMBus compatible ALERT response protocol with dedicated fault reporting inputs for each channel.

Specialized Applications

• Nested addressing systems requiring multiple I2C or SMBus segments
• Live board insertion and removal from backplanes without data corruption
• Level shifting applications between different voltage domains such as 5V and 3.3V

Specialized Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging and lead-free compliance. Confirm the IGN designation corresponds to the industrial temperature grade (-40°C to +85°C) and SSOP package type. Ensure the ordering information matches the manufacturer's current datasheet specifications for this exact part number.

Specialized Selection Notes

Select this component when capacitive isolation is required between I2C/SMBus segments. Consider the 2.7V to 5.5V VCC range and independent downstream pull-up capabilities. Evaluate the need for nested addressing and the specific package constraints of the 24-lead SSOP form factor for the target design.

Specialized Part Context

This part belongs to the LTC4306 family of 2-wire bus multiplexers. It shares core functionality with other variants like the LTC4306IUFD but differs in package style and temperature rating. The IGN suffix specifically denotes the SSOP package and industrial temperature range, distinguishing it from QFN or commercial grade alternatives.

Specialized Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

Specialized FAQ

How does the LTC4306 handle bus capacitance?

The device provides bus buffers that offer capacitive isolation between the upstream and downstream buses, effectively extending the bus capacitance limits.

What happens if a downstream bus is stuck low?

The programmable timeout circuitry monitors the bus state and will disconnect the downstream buses from the upstream bus if a stuck low condition persists beyond the programmed timeout period.

Can the downstream channels operate at different voltages?

Yes, each channel can be pulled up to a supply voltage ranging from 2.2V to 5.5V, independent of the LTC4306's own VCC supply voltage.