LTC4302CMS-2#PBF

Signal Buffers, Repeaters, Splitters Overview

The LTC4302CMS-2#PBF is an addressable I²C bus and SMBus compatible buffer manufactured by Analog Devices Inc. It supports supply voltages from 2.7V to 5.5V with a maximum operating frequency of 600 kHz. The device features a 10-pin MSOP package and includes a dedicated VCC2 pin for level shifting between systems with different supply voltages, such as translating between 5V and 3.3V domains. It provides electrical isolation until commanded to connect, utilizing a 1V precharge on SDA and SCL lines to minimize disturbances during live board insertion.

Signal Buffers, Repeaters, Splitters Feature Summary

• Enables safe hot-swapping of peripheral boards into live backplanes without corrupting the two-wire bus data or clock lines.
• Provides bidirectional buffering for SDA and SCL lines while maintaining electrical isolation until explicitly connected via bus commands.
• Translates logic levels between systems operating at different supply voltages through the dedicated VCC2 pin.

Signal Buffers, Repeaters, Splitters Applications

• Live board insertion and removal in server backplane architectures
• Level translation between 5V and 3.3V I²C/SMBus systems
• Capacitance buffering and bus extension for heavy capacitive loads

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify that the specific suffix CMS-2 corresponds to the commercial temperature range and the variant with the VCC2 pin rather than GPIO2. Confirm the package type matches the required PCB footprint. Ensure the ordering information aligns with the manufacturer's current datasheet specifications to avoid functional mismatches regarding the pin configuration.

Signal Buffers, Repeaters, Splitters Selection Notes

Select the LTC4302CMS-2#PBF when the design requires voltage translation between distinct power domains, specifically between 5V and 3.3V systems. This variant replaces one general-purpose I/O pin with a second supply rail (VCC2), making it suitable for nested addressing scenarios where level shifting is necessary. Ensure the application does not require the dual GPIO functionality found in the -1 variant.

Signal Buffers, Repeaters, Splitters Part Context

This component belongs to the LTC4302 family of addressable 2-wire bus buffers. The -2 suffix denotes the version equipped with a secondary supply voltage pin (VCC2) for level shifting, distinguishing it from the -1 version which offers two general-purpose input/output pins instead. Both variants share the same core hot-swap protection and addressable control mechanisms within the 10-lead MSOP package.

Signal Buffers, Repeaters, Splitters Replacement Considerations

LTC4302IMS-2#PBF serves as the industrial temperature range equivalent. Verify that the temperature rating meets the system requirements before substitution.