LTC4311CSC6#TRPBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4311CSC6#TRPBF is a dual I2C active pull-up accelerator designed to enhance data transmission speed and reliability for bus loading conditions exceeding the standard 400pF specification limit. It operates at supply voltages from 1.6V to 5.5V and is compatible with SMBus. The device provides slew-limited pull-up currents during positive transitions to quickly slew lines, while disabling currents during negative transitions to improve noise margins. It features an auto-detect standby mode reducing current when both SCL and SDA are high, and a low (<5μA) shutdown mode when disabled. The component supports up to 400kHz operation and includes ±8kV HBM ESD ruggedness.

Signal Buffers, Repeaters, Splitters Feature Summary

• Dual active pull-ups accelerate rise times on capacitive buses without compromising low-state noise margins
• Auto-detect standby mode reduces supply current when bus lines remain high
• Low current shutdown mode isolates bus pins when the enable pin is grounded
• Slew-limited output prevents signal reflections on lightly loaded buses

Signal Buffers, Repeaters, Splitters Applications

• Notebook and Palmtop Computers
• Portable Instruments
• Battery Chargers
• Industrial Controls
• TV/Video Products
• ACPI SMBus Interface

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. The CSC6 suffix indicates a 6-lead plastic SC70 package with a commercial operating range of 0°C to 70°C. Confirm that the TRPBF designation corresponds to the tape and reel quantity and lead-free finish requirements for your manufacturing process.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this part when bus capacitance exceeds 400pF or when multiple devices degrade rise times. Ensure the system voltage falls within the 1.6V to 5.5V range. For applications requiring operation below 0°C, choose the IDDC or ISC6 variants instead. Verify that the external pull-up resistor values allow the initial slew rate to exceed the detector threshold for proper activation.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4311 family of low-voltage I2C/SMBus accelerators. It serves as a performance upgrade over passive resistive pull-ups in high-capacitance environments. The device addresses signal integrity issues caused by slow rise times while maintaining compatibility with standard open-drain protocols used in embedded systems.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4311CDC#TRMPBF: Same function but DFN package and commercial temp range. LTC4311IDC#TRPBF: Same function but DFN package and industrial temp range. LTC4311ISC6#TRPBF: Same function and SC70 package but industrial temperature range (-40°C to 85°C).

Signal Buffers, Repeaters, Splitters FAQ

How does the LTC4311 handle negative bus transitions?

During negative transitions or steady DC levels, the internal pull-up currents are disabled. This allows the bus to fall quickly through the resistive pull-down drivers, improving the negative slew rate and enhancing low-state noise margins.

What triggers the auto-detect standby mode?

The device enters standby mode when both BUS1 and BUS2 pins detect a voltage within 400mV of VCC. In this state, the supply current reduces to approximately 26μA.

Can the LTC4311 be used in parallel to increase drive strength?

Yes, two LTC4311 devices may be used in parallel in very heavily loaded systems to increase the total pull-up current and meet stricter rise time requirements.