LTC4314 Pin-Selectable, 4-Channel, 2-Wire Multiplexer with Bus Buffers FEATURES DESCRIPTION n The LTC 4314 is a hot-swappable 4-channel 2-wire bus 1:4 Multiplexer/Switch for 2-Wire Bus n multiplexer that allows one upstream bus to connect to Bidirectional Buffer for SDA and SCL Lines n any combination of downstream busses or channels. High Noise Margin with V = 0.3V IL CC n An individual enable pin controls each connection. The ENABLE Pins Connect SDA and SCL Lines n LTC4314 provides bidirectional buffering, keeping the up- Selectable Rise Time Accelerator Current and stream bus capacitance isolated from the downstream bus Activation Voltage capacitances. The high noise margin allows the LTC4314 n Level Shift 1.5V, 1.8V, 2.5V, 3.3V and 5V Busses 2 to be interoperable with I C devices that drive a high V n Prevents SDA and SCL Corruption During Live Board OL (> 0.4V). The LTC4314 supports level translation between Insertion and Removal from Backplane 1.5V, 1.8V, 2.5V, 3.3V and 5V busses. The hot-swappable n Stuck Bus Disconnect and Recovery 2 2 nature of the LTC4314 allows I/O card insertion into, and n Compatible with I C, I C Fast Mode and SMBus removal from, a live backplane without corruption of the n 4kV Human Body Model (HBM) ESD Ruggedness data and clock busses. n 20-Lead SSOP and 3mm 4mm QFN Packages If both data and clock are not simultaneously high at least once in 45ms and DISCEN is high, a FAULT signal is APPLICATIONS generated indicating a stuck bus low condition, the input n Telecommunications Systems Including ATCA is disconnected from all enabled output channels, and up n Address Expansion to 16 clocks are generated on the enabled downstream n Level Translator busses. A three state ACC pin enables input and output n Capacitance Buffers/Bus Extender side rise time accelerators of varying strengths and sets n Live Board Insertion the V voltage. IL,RISING n PMBus 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 APPLICATION 3.3V 3.3V Rising Edge from Asserted Low with Level Translation 0.01F 0.01F 10k 10k V V 10k 10k 6V CC CC2 C + C = 100pF SCLOUT1 SCLOUT4 C = 50pF SCLIN SCLOUT4 SCLIN SCLIN 5V SDAIN SDAIN ENABLE1 ENABLE1 SCLOUT1 SCLOUT1 SCLOUT1 ENABLE2 ENABLE2 SDAOUT1 SDAOUT1 3.3V ENABLE3 ENABLE3 SCLIN ENABLE4 ENABLE4 5V 3.3V LTC4314 10k 10k 10k ACC SCLOUT4 SCLOUT4 0V DISCEN SDAOUT4 SDAOUT4 200ns/DIV 4314 TA01b FAULT FAULT GND 4314 TA01a 4314f 1 1V/DIVLTC4314 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Supply Voltages Output DC Sink Currents V , V ................................................. 0.3V to 6V FAULT ................................................................. 50mA CC CC2 Input Voltages Operating Ambient Temperature Range ACC, DISCEN, ENABLE1-4 ....................... 0.3V to 6V LTC4314C ................................................ 0C to 70C Input/Output Voltages LTC4314I..............................................40C to 85C SDAIN, SCLIN, SCLOUT1-4, Storage Temperature Range ..................65C to 150C SDAOUT1-4, FAULT ................................. 0.3V to 6V Lead Temperature (Soldering, 10 sec) SSOP ............................................................... 300C PIN CONFIGURATION TOP VIEW TOP VIEW DISCEN 1 20 ACC 20 19 18 17 V 2 19 GND CC SCLOUT1 1 16 SDAOUT4 SCLOUT1 3 18 SDAOUT4 SDAOUT1 2 15 SCLOUT4 SDAOUT1 4 17 SCLOUT4 SDAIN 3 14 V CC2 SDAIN 5 21 16 V CC2 SCLIN 4 13 FAULT SCLIN 6 15 FAULT SCLOUT2 5 12 SDAOUT3 SCLOUT2 7 14 SDAOUT3 SDAOUT2 6 11 SCLOUT3 SDAOUT2 8 13 SCLOUT3 7 8 9 10 ENABLE4 9 12 ENABLE1 ENABLE3 10 11 ENABLE2 GN PACKAGE UDC PACKAGE 20-LEAD PLASTIC SSOP 20-LEAD (3mm s 4mm) PLASTIC QFN T = 150C, = 90C/W, = 30C/W JMAX JA JC T = 150C, = 68C/W, = 4.2C/W JMAX JA JC EXPOSED PAD (PIN 21) PCB CONNECTION TO GND IS OPTIONAL ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4314IUDC PBF LTC4314IUDC TRPBF LFMR 20-Lead (3mm 4mm) QFN 40C to 85C LTC4314IGN PBF LTC4314IGN TRPBF LTC4314GN 20-Lead Plastic SSOP 40C to 85C LTC4314CUDC PBF LTC4314CUDC TRPBF LFMR 20-Lead (3mm 4mm) QFN 0C to 70C LTC4314CGN PBF LTC4314CGN TRPBF LTC4314GN 20-Lead Plastic SSOP 0C to 70C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: