LTC4314CUDC#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4314CUDC#PBF is a pin-selectable, 4-channel, 2-wire bus multiplexer with integrated bus buffers. It allows one upstream bus to connect to any combination of downstream busses or channels via individual enable pins. The device provides bidirectional buffering for SDA and SCL lines, isolating upstream capacitance from downstream loads. It supports level translation between 1.5V, 1.8V, 2.5V, 3.3V, and 5V busses. Electrical specifications include an input supply voltage range of 2.9V to 5.5V, an output side accelerator supply of 2.25V to 5.5V, and an input supply current of up to 9mA when enabled. It operates within a temperature range of 0°C to 70°C in a 20-lead (3mm × 4mm) QFN package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Pin-selectable 1:4 multiplexing for 2-wire buses with independent channel control
• Bidirectional buffering that isolates upstream bus capacitance from downstream loads
• Integrated rise time accelerators with selectable strength and activation voltage
• Automatic stuck bus disconnect and recovery mechanism with fault signaling

Signal Buffers, Repeaters, Splitters Applications

• Telecommunications systems including ATCA backplanes
• Address expansion for I2C and SMBus networks
• Level translation between different bus voltage domains
• Live board insertion and removal protection
• Capacitance buffering and bus extension

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific suffix #PBF indicates lead-free finish and RoHS compliance as per manufacturer standards. Confirm the C grade designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure the UDC package type matches the required 20-lead QFN footprint for PCB layout compatibility. Cross-reference the ordering information table to validate availability against the specific part number variant.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when a 1:4 multiplexing function with high noise margin is required for I2C or SMBus applications. Consider the VCC and VCC2 supply requirements if level translation between different voltage domains is necessary. Evaluate the ACC pin configuration to determine the appropriate rise time accelerator strength for the specific bus capacitance and slew rate needs. Ensure the operating temperature range meets the system's environmental constraints.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4314 family of hot-swappable 2-wire bus multiplexers. It shares functional similarities with other devices in the series but is distinguished by its specific package and temperature grade. The CUDC variant specifically denotes the commercial temperature range and the plastic QFN package style, differentiating it from industrial grade or SSOP package alternatives within the same product line.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4314IUDC#PBF offers identical functionality with an extended industrial temperature range of -40°C to 85°C. LTC4314IGN#PBF provides the same electrical characteristics in a 20-lead Plastic SSOP package instead of QFN. Verify pinout compatibility and thermal performance when substituting between package types.