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LTC4305 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4305 Datasheet(HTML) 1 Page - Linear Technology |
1 / 20 page LTC4305 1 4305f APPLICATIO S TYPICAL APPLICATIO FEATURES DESCRIPTIO The LTC ®4305 is a 2-channel, 2-wire bus multiplexer with bus buffers to provide capacitive isolation between the upstream bus and downstream buses. Through software control, the LTC4305 connects the upstream 2-wire bus to any desired combination of downstream channels. Each channel can be pulled up to a supply voltage ranging from 2.2V to 5.5V, independent of the LTC4305 supply voltage. The downstream channels are also provided with an ALERT1–ALERT2 inputs for fault reporting. Programmable timeout circuitry disconnects the down- stream buses if the bus is stuck low. When activated, rise time accelerators source currents into the 2-wire bus pins to reduce rise time. Driving the ENABLE pin low restores all features to their default states. Three address pins provide 27 distinct addresses. The LTC4305 is available in 16-lead (4mm × 5mm) DFN and SSOP packages. ■ Nested Addressing ■ 5V/3.3V Level Translator ■ Capacitance Buffer/Bus Extender ■ 1:2 2-Wire Multiplexer/Switch ■ Connect SDA and SCL Lines with 2-Wire Bus Commands ■ Supply Independent Bidirectional Buffer for SDA and SCL Lines Increases Fan-Out ■ Programmable Disconnect from Stuck Bus ■ Compatible with I2C and SMBus Standards ■ Rise Time Accelerator Circuitry ■ SMBus Compatible ALERT Response Protocol ■ Prevents SDA and SCL Corruption During Live Board Insertion and Removal from Backplane ■ ±10kV Human Body Model ESD Ruggedness ■ 16-Lead (4mm × 5mm) DFN and SSOP Packages 2-Channel, 2-Wire Bus Multiplexer with Capacitance Buffering , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patent Pending. A Level-Shifting and Nested Addressing Application 10k 0.01 µF 10k 10k 10k 10k 10k ADDRESS = 1000 100 SFP MODULE #1 10k 10k 10k ADDRESS = 1111 000 MICRO- CONTROLLER SFP MODULE #2 ADDRESS = 1111 000 2.5V 5V 3.3V 4305 TA01 SCLIN SDAIN ALERT ADR2 ADR1 ADR0 GND SCL1 SDA1 ALERT1 SCL2 SDA2 ALERT2 VCC LTC4305 4305 TA01b VCC = 3.3V VCARD1 = 3.3V VCARD2 = 5V VBACK = 2.5V SCL2 2V/DIV 500ns/DIV SCL1 2V/DIV SCLIN 2V/DIV I2C Bus Waveforms |
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