LTC4312IDE#PBF

LTC4312 is a hot-swappable 2-channel 2-wire bus multiplexer that allows one upstream bus to connect to any combination of downstream busses or channels. An individual enable pin controls each connection. It provides bidirectional buffering, keeping the upstream bus capacitance isolated from the downstream bus capacitances. The hot-swappable nature of the device allows I/O card insertion into, and removal from, a live backplane without corruption of the data and clock busses. If both data and clock are not simultaneously high at least once in 45ms and DISCEN is high, a FAULT signal is generated indicating a stuck bus low condition, the input is disconnected from each enabled output channel and upto 16 clocks are generated on the enabled downstream busses. It is used in application such as telecommunications systems including ATCA, address expansion, level translator, capacitance buffers/bus extender, live board insertion, PMBus etc.

• 1:2 multiplexer/switch for 2-wire bus
• Bidirectional buffer for SDA and SCL lines
• ENABLE pins connect SDA and SCL lines
• Selectable rise time accelerator current and activation voltage
• Stuck bus disconnect and recovery
• ±4KV human body model (HBM) ESD ruggedness
• Input supply voltage range is 2.9V to 5.5V
• Input supply current is 7.3mA typical at (one or both VENABLE1-2 = VCC = VCC2 = 5.5V)
• Level shift 1.5V, 1.8V, 2.5V, 3.3V and 5V busses
• Operating ambient temperature is -40°C to 85°C, package style is 14-lead DFN

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