LTC4315 2-Wire Bus Buffer with High Noise Margin FEATURES DESCRIPTION n Bidirectional Buffer Increases Fanout The LTC4315 is a hot-swappable 2-wire bus buffer n High Noise Margin with V = 0.3 V 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 Drive a High V 0.3 V . The high noise margin allows the LTC4315 to be OL CC n Selectable Rise Time Accelerator Current interoperable with devices that drive a high V (>0.4V) OL n Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses and allows multiple LTC4315s to be cascaded. The LTC4315 n Prevents SDA and SCL Corruption During Live Board supports level translation between 1.5V, 1.8V, 2.5V, 3.3V Insertion and Removal from Backplane and 5V busses. n Stuck Bus Disconnect and Recovery During insertion, the SDA and SCL lines are precharged 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 12-Lead (4mm 3mm) DFN and 12-Lead MSOP on the SDA and SCL pins. Packages If both data and clock are not simultaneously high at least once in 45ms and DISCEN is high, a FAULT signal APPLICATIONS is generated indicating a stuck bus low condition and the n input is disconnected from the output. Up to 16 clock Capacitance Buffers/Bus Extender n pulses are subsequently generated to free the stuck bus. Live Board Insertion n A three state ACC pin enables input and output side rise Telecommunications Systems Including ATCA n time accelerators of various strengths. Level Translation n L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot Swap PMBus is a trademark of Linear Technology Corporation. All other trademarks are the property of their n Servers respective owners. Protected by U.S. patents, including 6356140, 6650174, 7032051, 7478286. TYPICAL APPLICATION 400kHz Operation 3.3V 5V R = 2.7k, C = 50pF BUS IN BUS IN R = 1.3k, C = 400pF, ACC = 0V BUS OUT BUS OUT V V 0.01F 2.7k 2.7k 10k 1.3k 1.3k 10k CC CC2 SCLOUT DISCEN ENABLE SCLIN LTC4315 READY READY SCLOUT SCL2 SCL1 SCLIN SDAOUT SDA2 SDA1 SDAIN 4315 TA01b 500ns/DIV FAULT FAULT ACC GND 4315 TA01a 4315f 1 1V/DIVLTC4315 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages V , V ........................... 0.3V to 6V Operating Ambient Temperature Range CC CC2 Input Voltages ACC, DISCEN, ENABLE ......... 0.3V to 6V LTC4315C ................................................ 0C to 70C Input/Output Voltages SDAIN, SCLIN, SCLOUT, LTC4315I.............................................. 40C to 85C SDAOUT ....................................................... 0.3V to 6V Storage Temperature Range .................. 65C to 150C Output Voltages FAULT, READY ................... 0.3V to 6V Lead Temperature (Soldering, 10 sec) Output Sink Currents MSOP ...............................................................300C FAULT, READY ...................................................50mA PIN CONFIGURATION TOP VIEW TOP VIEW ENABLE 1 12 V CC 1 12 V ENABLE CC DISCEN 2 11 V CC2 DISCEN 2 11 V CC2 SCLOUT 3 10 SDAOUT SCLOUT 3 10 SDAOUT 13 SCLIN 4 9 SDAIN SCLIN 4 9 SDAIN ACC 5 8 FAULT GND 6 7 READY ACC 5 8 FAULT GND 6 7 READY MS PACKAGE 12-LEAD PLASTIC MSOP DE PACKAGE T = 150C, = 135C/W JMAX JA 12-LEAD (4mm 3mm) PLASTIC DFN T = 150C, = 43C/W JMAX JA EXPOSED PAD (PIN 13) PCB CONNECTION TO GND IS OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4315CDE PBF LTC4315CDE TRPBF 4315 12-Lead (4mm 3mm) DFN 0C to 70C LTC4315IDE PBF LTC4315IDE TRPBF 4315 12-Lead (4mm 3mm) DFN 40C to 85C LTC4315CMS PBF LTC4315CMS TRPBF 4315 12-Lead Plastic MSOP 0C to 70C LTC4315IMS PBF LTC4315IMS TRPBF 4315 12-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: