2- & 4-Channel Hot Swap I2C Multiplexers with Capacitive Buffering Supercapacitors

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A pair of 2-wire bus multiplexers provides individual enable pins to connect an upstream I2C bus to any combination of downstream buses or cards. The LTC4312 and LTC4314 from Linear Technology are pin-selectable multiplexers with bus buffers that reduce component count while promoting ideal I2C signal integrity. The LTC4312 multiplexes two channels, while the LTC4314 multiplexes four channels. These devices allow easy I2C address expansion, providing the ability to address one of multiple identical devices, thus resolving address conflict issues. Bidirectional capacitive buffering allows extension of the I2C bus size well beyond the 400pF I2C bus specification and prevents I2C signal corruption during live board insertion or removal.

The LTC4312 and LTC4314 are suitable for a wide range of applications, including radial architectures in telecommunications systems such as ATCA, address expansion and level translators. Many I2C and SMBus devices operate at different supply voltage levels, yet must communicate in the same application. The LTC4312 and LTC4314 support level translation for bus voltages ranging from 1.5V to 5.5V. This enables the powering of devices from different supply voltages while maintaining fully bidirectional communications between all devices in the system. Pricing for the LTC4312 and LTC4314 starts at $1.95 and $2.65 each, respectively, for 1,000-piece quantities. 

Linear Technology, Milpitas, CA. (408) 432-1900. [].