LTC4301L Hot Swappable 2-Wire Bus Buffer with Low Voltage Level Translation FEATURES DESCRIPTIO Level Translates 1V Signals to Standard 3.3V and The LTC 4301L hot swappable, 2-wire bus buffer allows 5V Logic Rails I/O card insertion into a live backplane without corruption Allows Bus Pull-Up Voltages as Low as 1V on of the data and clock busses. In addition, the LTC4301L SDAIN and SCLIN SDAIN and SCLIN pins are compatible with systems with Bidirectional Buffer* for SDA and SCL Lines pull-up voltages as low as 1V. Control circuitry prevents Increases Fanout the backplane from being connected to the card until a Prevents SDA and SCL Corruption During Live Board stop bit or a bus idle is present. When the connection is Insertion and Removal from Backplane made, the LTC4301L provides bidirectional buffering, Isolates Input SDA and SCL Line from Output keeping the backplane and card capacitances isolated. 10kV Human Body Model ESD Protection When driven low, the CS input pin allows the part to Supports Clock Stretching, Arbitration and connect after a stop bit or bus idle occurs. Driving CS high Synchronization breaks the connection between SCLIN and SCLOUT and High Impedance SDA, SCL Pins for V = 0V CC between SDAIN and SDAOUT. A logic high on READY CS Gates Connection from Input to Output indicates that the backplane and card sides are connected TM 2 2 Compatible with I C , I C Fast Mode and SMBus together. Standards (Up to 400kHz Operation) The LTC4301L is offered in 8-pin DFN (3mm 3mm) and Small 8-Pin MSOP and DFN (3mm 3mm) Packages U MSOP packages. APPLICATIO S , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Hot Board Insertion Protected by U.S. Patents including 7032051. Servers Capacitance Buffer/Bus Extender Desktop Computers TYPICAL APPLICATIO Input-Output Connection 1.2V 3.3V 0.01F 2k 2k 10k 10k V V CC CC SDA SDAIN SDAOUT SDA OUTPUT INPUT SIDE SIDE P LTC4301L 20pF 55pF SCL SCLIN SCLOUT SCL 0.5V/DIV CS READY GND GND 4301l TA01a 4301 TA01b 1s/DIV 4301lfa 1 U ULTC4301L ABSOLUTE MAXIMUM RATINGS (Note 1) V to GND ................................................. 0.3V to 7V Storage Temperature Range CC SDAIN, SCLIN, SDAOUT, SCLOUT, CS ........ 0.3V to 7V MSOP ............................................... 65C to 150C READY ........................................................ 0.3V to 6V DFN .................................................. 65C to 125C Operating Temperature Range Lead Temperature (Soldering, 10 sec).................. 300C LTC4301LC ............................................. 0C to 70C LTC4301LI.......................................... 40C to 85C PACKAGE/ORDER INFORMATION TOP VIEW CS 1 8 V CC TOP VIEW SCLOUT 2 7 SDAOUT CS 1 8 V CC 9 SCLOUT 2 7 SDAOUT SCLIN SDAIN 3 6 SCLIN 3 6 SDAIN GND 4 5 READY GND 4 5 READY MS8 PACKAGE DD PACKAGE 8-LEAD PLASTIC MSOP 8-LEAD (3mm 3mm) PLASTIC DFN T = 125C, = 200C/W JMAX JA T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 9) IS GND PCB CONNECTION OPTIONAL ORDER PART NUMBER DD PART MARKING ORDER PART NUMBER MS8 PART MARKING LTC4301LCDD LBHS LTC4301LCMS8 LTBHQ LTC4301LIDD LTC4301LIMS8 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: