LTC4305 2-Channel, 2-Wire Bus Multiplexer with Capacitance Buffering FEATURES DESCRIPTIO 1:2 2-Wire Multiplexer/Switch The LTC 4305 is a 2-channel, 2-wire bus multiplexer with Connect SDA and SCL Lines with 2-Wire Bus bus buffers to provide capacitive isolation between the Commands upstream bus and downstream buses. Through software Supply Independent Bidirectional Buffer for SDA control, the LTC4305 connects the upstream 2-wire bus and SCL Lines Increases Fan-Out to any desired combination of downstream channels. Programmable Disconnect from Stuck Bus Each channel can be pulled up to a supply voltage ranging 2 Compatible with I C and SMBus Standards from 2.2V to 5.5V, independent of the LTC4305 supply Rise Time Accelerator Circuitry voltage. The downstream channels are also provided with SMBus Compatible ALERT Response Protocol an ALERT1ALERT2 inputs for fault reporting. Prevents SDA and SCL Corruption During Live Board Programmable timeout circuitry disconnects the down- Insertion and Removal from Backplane stream buses if the bus is stuck low. When activated, rise 10kV Human Body Model ESD Ruggedness time accelerators source currents into the 2-wire bus pins 16-Lead (4mm 5mm) DFN and SSOP Packages to reduce rise time. Driving the ENABLE pin low restores all features to their default states. Three address pins U provide 27 distinct addresses. APPLICATIO S The LTC4305 is available in 16-lead (4mm 5mm) DFN Nested Addressing and SSOP packages. 5V/3.3V Level Translator , LTC and LT are registered trademarks of Linear Technology Corporation. All other Capacitance Buffer/Bus Extender trademarks are the property of their respective owners. Patent Pending. TYPICAL APPLICATIO A Level-Shifting and Nested Addressing Application 2 I C Bus Waveforms 2.5V 3.3V V = 3.3V 0.01F CC VBACK = 2.5V 10k 10k 10k 10k 10k 10k SCLIN 2V/DIV V CC SCL1 SCLIN MICRO- SFP SDA1 VCARD1 = 3.3V SDAIN CONTROLLER MODULE 1 SCL1 ALERT1 ALERT 2V/DIV ADDRESS = 1111 000 5V LTC4305 VCARD2 = 5V SCL2 10k 10k 10k ADR2 2V/DIV ADR1 SCL2 SFP 4305 TA01b ADR0 SDA2 500ns/DIV MODULE 2 GND ALERT2 4305 TA01 ADDRESS = 1111 000 ADDRESS = 1000 100 4305f 1 U ULTC4305 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage (V ) ................................... 0.3V to 7V Operating Temperature Range CC Input Voltages (ADR0, ADR1, ADR2, LTC4305C ............................................... 0C to 70C ENABLE, ALERT1, ALERT2) .................... 0.3V to 7V LTC4305I............................................. 40C to 85C Output Voltages (ALERT, READY) ............... 0.3V to 7V Storage Temperature Range Input/Output Voltages (SDAIN, SCLIN, DHD Package .................................... 65C to 125C SCL1, SDA1, SCL2, SDA2) ...................... 0.3V to 7V GN Package ....................................... 65C to 150C Output Sink Current (SDAIN, SCLIN, SCL1, Lead Temperature (Soldering, 10 sec) SDA1, SCL2, SDA2, ALERT, READY) ............... 10mA GN Package ...................................................... 300C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW ALERT2 1 16 SCL2 1 16 SCL2 ALERT2 ALERT 2 15 SDA2 2 15 SDA2 ALERT SDAIN 3 14 ALERT1 3 14 ALERT1 SDAIN GND 4 13 SDA1 17 4 13 SDA1 GND 12 SCLIN 5 SCL1 5 12 SCL1 SCLIN ENABLE 6 11 READY 6 11 READY ENABLE V 7 10 ADR2 CC 7 10 ADR2 V CC ADRO 8 9 ADR1 8 9 ADR1 ADR0 DHD PACKAGE GN PACKAGE 16-LEAD (4mm 5mm) PLASTIC DFN 16-LEAD NARROW PLASTIC SSOP EXPOSED PAD (PIN 17) PCB CONNECTION OPTIONAL T = 125C, = 135C/W MUST BE CONNECTED TO PCB TO OBTAIN JMAX JA = 43C/W OTHERWISE = 140C/W. T = 125C JA JA JMAX ORDER PART NUMBER DHD PART MARKING ORDER PART NUMBER GN PART MARKING LTC4305CDHD 4305 LTC4305CGN 4305 LTC4305IDHD 4305 LTC4305IGN 4305I Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marketing: