Introduced the design features of 2-channel and 4-channel pin-selectable I2C multiplexers with high noise margin, capacitance buffering, level translation and stuck bus recovery.
The LTC4312 and LTC4314 are pin-selectable 2-channel and 4-channel I2C multiplexers designed to address practical problems in large systems, such as address expansion, noise immunity, and stuck bus recovery. These devices feature high noise margin, capacitance buffering, level translation, and rise time accelerators (RTAs). They allow for the partitioning of bus capacitance and support communication between buses with different voltage levels ranging from 1.5V to 5.5V.
The device operates from 2.9V to 5.5V, with output voltages ranging from 2.25V to 5.5V.
It disconnects the upstream bus and generates up to 16 clock pulses and a stop bit to convince the stuck device to release high.
The buffer turn-off voltage is 1.089V, ensuring logic low noise margin of greater than 0.4V.