LTC4314IUDC#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4314IUDC#PBF is a hot-swappable, pin-selectable 4-channel 2-wire bus multiplexer with integrated bidirectional buffers. It allows one upstream I2C or SMBus to connect to any combination of downstream busses while isolating capacitance. The device supports level translation between 1.5V, 1.8V, 2.5V, 3.3V, and 5V logic levels. Key electrical parameters include an input supply voltage range of 2.9V to 5.5V (VCC) and 2.25V to 5.5V (VCC2). It features selectable rise time accelerators controlled by the ACC pin, stuck bus disconnect and recovery mechanisms, and ±4kV HBM ESD ruggedness. The component is housed in a 20-lead 3mm × 4mm QFN package.

Signal Buffers, Repeaters, Splitters Feature Summary

• Bidirectional buffering isolates upstream bus capacitance from downstream loads.
• Pin-selectable enable inputs control individual channel connections.
• Selectable rise time accelerator current and activation voltage via ACC pin.
• Automatic stuck bus detection and recovery with up to sixteen clock pulses.

Signal Buffers, Repeaters, Splitters Applications

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

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm that the lead-free finish designation aligns with environmental compliance requirements. Ensure the tape and reel specification is correct if automated assembly is planned. Cross-reference the manufacturer's latest documentation for any updates to part marking or packaging standards before finalizing orders.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component when a 1:4 multiplexing function with independent channel control is required. Consider the VCC and VCC2 supply voltages to ensure compatibility with the highest and lowest bus levels in the system. Evaluate the need for rise time acceleration based on total bus capacitance and pull-up resistor values. Verify that the operating temperature range meets the application environment specifications.

Signal Buffers, Repeaters, Splitters Part Context

This part belongs to the LTC4314 family of 2-wire bus multiplexers. It shares functional similarities with other models like the LTC4314IGN but differs in physical packaging. The UDC suffix specifically denotes the 20-lead plastic QFN package variant. Other variants in the series may offer different thermal characteristics or footprint dimensions suitable for distinct PCB layout constraints.

Signal Buffers, Repeaters, Splitters Replacement Considerations

The LTC4314IGN#PBF serves as a direct functional replacement offering identical electrical performance in a 20-lead SSOP package. Users must account for the difference in physical dimensions and pinout orientation when switching between the QFN and SSOP packages. No changes to circuit functionality are expected, but mechanical fit verification is necessary.