LTC4300A-3 Level-Shifting Hot Swappable 2-Wire Bus Buffer with Enable Fea T Descrip T n Bidirectional Buffer* for SDA and SCL Lines The LTC 4300A-3 hot swappable 2-wire bus buffer allows Increases Fanout I/O card insertion into a live backplane without corruption n Prevents SDA and SCL Corruption During Live of the data and clock busses. When the connection is made, Board Insertion and Removal From Backplane the LTC4300A-3 provides bidirectional buffering, keeping n Logic Threshold ENABLE Input the backplane and card capacitances isolated. Rise time n Isolates Input SDA and SCL Lines From Output accelerator circuitry allows the use of weaker DC pull-up 2 2 n Compatible with I C, I C Fast Mode and SMBus currents while still meeting rise time requirements. During Standards (Up to 400kHz Operation) insertion, the SDA and SCL lines are precharged to 1V to n 1V Precharge on all SDA and SCL Lines minimize bus disturbances. n Supports Clock Stretching, Arbitration and The LTC4300A-3 provides level translation between Synchronization 3.3V and 5V supplies. The backplane and card can both 5V to 3.3V Level Translation be powered with supplies ranging from 2.7V to 5.5V. High Impedance SDA, SCL Pins for V = 0V, CC The LTC4300A-3 also incorporates a CMOS threshold V = 0V CC2 ENABLE pin which forces the part into a low current mode Small 8-Lead DFN and MSOP Packages and isolates the card from the backplane. When driven to V , the ENABLE pin sets normal operation. CC a T The LTC4300A-3 is available in the MSOP and 3mm 3mm n Hot Board Insertion DFN packages. n Servers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Capacitance Buffer/Bus Extender Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Patent pending. n Desktop Computer Typical a T V CC InputOutput Connection V CC2 3.3V 0.01F 0.01F 10k 10k 10k 10k 8 1 INPUT OUTPUT SIDE 3 2 SIDE SCLIN SCLOUT 150pF 50pF 0.5V/DIV 6 7 SDAIN SDAOUT 4300a3 TA01b 200ns/DIV LTC4300A-3 5 OFF ON ENABLE GND 4300a3 TA01 4 4300a3fa 1 ion pplica ions pplica ion uresLTC4300A-3 a Te Maxi Mu M r a T (Note 1) V to GND ..................................................0.3V to 7V Storage Temperature Range CC V to GND ................................................. 0.3V to 7V MSOP ................................................ 65C to 150C CC2 SDAIN, SCLIN, SDAOUT, SCLOUT ................ 0.3V to 7V DFN .................................................... 65C to 125C ENABLE ........................................................ 0.3V to 7V Lead Temperature (Soldering, 10 sec) Operating Temperature Range MSOP Only .......................................................300C LTC4300A-3C ......................................... 0C to 70C LTC4300A-3I........................................40C to 85C p c F T TOP VIEW TOP VIEW V 1 8 V CC2 CC V 1 8 V SCLOUT 2 7 SDAOUT CC2 CC 9 SCLOUT 2 7 SDAOUT SCLIN SDAIN 3 6 SCLIN 3 6 SDAIN GND 4 5 ENABLE GND 4 5 ENABLE MS8 PACKAGE 8-LEAD PLASTIC MSOP DD PACKAGE T = 125C, = 200C/W 8-LEAD (3mm 3mm) PLASTIC DFN JMAX JA T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 9), PCB CONNECTION IS OPTIONAL o r D i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4300A-3CDD PBF LTC4300A-3CDD TRPBF LBHG 8-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC4300A-3IDD PBF LTC4300A-3IDD TRPBF LBHG 40C to 85C 8-Lead (3mm 3mm) Plastic DFN LTC4300A-3CMS8 PBF LTC4300A-3CMS8 TRPBF LTBHD 8-Lead Plastic MSOP 0C to 70C LTC4300A-3IMS8 PBF LLTC4300A-3IMS8 TRPBF LTBHF 8-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: