LTC4313-1/LTC4313-2/ LTC4313-3 2-Wire Bus Buffers with High Noise Margin Fea T Descrip T n Bidirectional Buffer Increases Fanout The LTC 4313 is a hot swappable 2-wire bus buffer n High Noise Margin with V = 0.3V that provides bidirectional buffering while maintain- IL CC 2 n Compatible with Non-Compliant I C Devices That ing a low offset voltage and high noise margin up to 0.3 V . The high noise margin allows the LTC4313 to be Drive a High V CC OL n interoperable with devices that drive a high V (>0.4V) and Strong (LTC4313-1) and 2.5mA (LTC4313-2) OL allows multiple LTC4313s to be cascaded. The LTC4313-1 Rise Time Accelerator Current n and LTC4313-2 support level translation between 3.3V and Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses n 5V busses. In addition to these voltages, the LTC4313-3 Prevents SDA and SCL Corruption During Live Board also supports level translation to 1.5V, 1.8V and 2.5V. Insertion and Removal from Backplane n Stuck Bus Disconnect and Recovery During insertion, the SDA and SCL lines are pre-charged to 2 2 n Compatible with I C, I C Fast Mode and SMBus 1V to minimize bus disturbances. Connection is established n 4kV Human Body Model ESD Ruggedness between the input and output after ENABLE is asserted n High Impedance SDA, SCL Pins When Unpowered high and a stop bit or bus idle condition has been detected n 8-Lead MSOP and 8-Lead (3mm 3mm) DFN on the SDA and SCL pins. Packages If both data and clock are not simultaneously high at least once in 45ms, the input is disconnected from the output. Up to 16 clock pulses are subsequently generated to free a T the stuck bus. Rise time accelerators (RTAs) provide pull-up n Capacitance Buffers/Bus Extender currents on SDA and SCL rising edges to meet rise time n Live Board Insertion specifications in heavily loaded systems. The RTAs are n Telecommunications Systems Including ATCA configured as slew limited switches in the LTC4313-1 and n Level Translation 2.5mA current sources in the LTC4313-2. The LTC4313-3 n PMBus does not have RTAs. n Servers L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6356140, 6650174, 7032051, 7478286. Typical a T 400kHz Operation 3.3V 5V R = 2.7k, C = 50pF BUS IN BUS IN R = 1.3k, C = 100pF 0.01F BUS OUT BUS OUT V CC 2.7k 2.7k 10k 1.3k 1.3k SCLOUT ENABLE LTC4313-1 SCLIN READY READY SCL1 SCLIN SCLOUT SCL2 SDA1 SDAIN SDAOUT SDA2 GND 4313123 TA01b 4313123 TA01a 500ns/DIV 4313123f 1 1V/DIV ion pplica ions pplica ion uresLTC4313-1/LTC4313-2/ LTC4313-3 a Te Maxi Mu M r a T (Notes 1, 2) Supply Voltage V ...................................... 0.3V to 6V Operating Ambient Temperature Range CC Input Voltage ENABLE .................................. 0.3V to 6V LTC4313C ................................................ 0C to 70C Input/Output Voltages SDAIN, SDAOUT, LTC4313I.............................................. 40C to 85C SCLIN, SCLOUT ........................................... 0.3V to 6V Storage Temperature Range .................. 65C to 150C Output Voltage READY ................................. 0.3V to 6V Lead Temperature (Soldering, 10 sec) Output Sink Current READY ...................................50mA MS Package ...................................................... 300C p in c F T TOP VIEW TOP VIEW ENABLE 1 8 V CC ENABLE 1 8 V CC SCLOUT 2 7 SDAOUT SCLOUT 2 7 SDAOUT 9 SCLIN 3 6 SDAIN SCLIN 3 6 SDAIN GND 4 5 READY GND 4 5 READY MS8 PACKAGE 8-LEAD PLASTIC MSOP DD8 PACKAGE T = 150C, = 163C/W JMAX JA 8-LEAD (3mm 3mm) PLASTIC DFN T = 150C, = 39.7C/W JMAX JA EXPOSED PAD (PIN 9) PCB CONNECTION TO GND IS OPTIONAL o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4313CDD-1 PBF LTC4313CDD-1 TRPBF LFYZ 8-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC4313IDD-1 PBF LTC4313IDD-1 TRPBF LFYZ 8-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC4313CMS8-1 PBF LTC4313CMS8-1 TRPBF LTFYZ 8-Lead Plastic MSOP 0C to 70C LTC4313IMS8-1 PBF LTC4313IMS8-1 TRPBF LTFYZ 8-Lead Plastic MSOP 40C to 85C LTC4313CDD-2 PBF LTC4313CDD-2 TRPBF LFZB 8-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC4313IDD-2 PBF LTC4313IDD-2 TRPBF LFZB 8-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC4313CMS8-2 PBF LTC4313CMS8-2 TRPBF LTFZC 8-Lead Plastic MSOP 0C to 70C LTC4313IMS8-2 PBF LTC4313IMS8-2 TRPBF LTFZC 8-Lead Plastic MSOP 40C to 85C LTC4313CDD-3 PBF LTC4313CDD-3 TRPBF LGDD 8-Lead (3mm 3mm) Plastic DFN 0C to 70C LTC4313IDD-3 PBF LTC4313IDD-3 TRPBF LGDD 8-Lead (3mm 3mm) Plastic DFN 40C to 85C LTC4313CMS8-3 PBF LTC4313CMS8-3 TRPBF LTGDF 8-Lead Plastic MSOP 0C to 70C LTC4313IMS8-3 PBF LTC4313IMS8-3 TRPBF LTGDF 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. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: