LTC4304IMS - Hot Swappable 2-Wire Bus Buffer

The LTC4304IMS from Linear Technology is a robust hot swappable 2-wire bus buffer that significantly enhances the capabilities and performance of I2C bus systems. Designed to allow insertion or removal of cards in a live backplane without disrupting the communication of the bus, this device is ideal for advanced server, telecom, and networking applications where system maintenance and expansion need to be executed with minimal downtime.

The LTC4304IMS provides capacitive isolation between the backplane and the cards, even when the cards are not powered. This is achieved through Linear Technology's strong buffer design that allows extension of the I2C bus size beyond the traditional 400pF bus capacitance limit. It supports bus capacitance of up to 3000pF, thus enabling a higher number of nodes and longer bus lengths.

With its rise time accelerator circuits, the LTC4304IMS enhances both the rise and fall times of the SDA and SCL lines, which ensures that the I2C bus standard speed requirements are met, even with large capacitive loads. This feature is particularly important in ensuring the integrity and speed of communication in complex systems.

The LTC4304IMS also includes an under-voltage lockout feature that disables the device's output when the card supply voltage is below a certain threshold, thus preventing incorrect operation during power-up or power-down. Additionally, the built-in fault protection circuitry guards the bus against stuck-low conditions, which can occur if a card is incorrectly inserted or removed.

Available in a compact 10-lead MSOP package, the LTC4304IMS operates over the commercial and industrial temperature ranges. Its small footprint, combined with the high level of integration, makes it an excellent choice for space-constrained applications that require reliable and continuous 2-wire bus communication.

Overall, the LTC4304IMS is a powerful solution for creating more reliable and flexible I2C bus systems, offering both protection and performance enhancements that are critical for modern electronic systems.