2 I C/SMBus Address Translators The LTC4316/LTC4317/LTC4318 are I2C/SMBus address translators that bridge two or more segments of an I2C bus, reading incoming addresses on the master side and transmitting a different 7-bit I2C address to the slave side to avoid address conflicts. Only discrete resistors are needed to select the new address and no software programming is required. Up to 127 different address translations are available. Features n n n n n n n n n Allows Multiple Slaves with the Same Address to Coexist on the Same Bus Resistor Configurable Address Translation No Software Programming Required SMBus, I2C and I2C Fast Mode Compatible Pass-Through Mode Allows General Call Addressing ±4kV HBM ESD Level Translation for 2.5V, 3.3V and 5V Buses Stuck Bus Timeout Prevents SDA and SCL Corruption During Live Board Insertion and Removal Part Selection Number of Input Channels Number of Output Channels Packages LTC4316 1 1 3mm × 3mm DFN-10, MSOP-10 LTC4317 1 2 5mm × 3mm DFN-16 LTC4318 2 2 4mm × 4mm QFN-20 Part Number Timing Diagram Example START BIT ADDRESS BITS R/W BIT ACK BIT a6 a5 a4 a3 a2 a1 a0 SDAIN 0 0 1 1 0 1 0 0 = 0x34 TRANSLATION BYTE 0 0 0 0 0 0 1 0 = 0x02 SDAOUT 0 0 1 1 0 1 1 0 = 0x36 SCLIN L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Configurations Two Independent Address Translations SCLIN SCL SCL SCLOUT LTC4316 #1 SDAIN SLAVE #1 00110010 00000110 00110100 SLAVE #2 SDA SDA SDAOUT SLAVE #1 INPUT ADDRESS 0x32 TRANSLATION BYTE 0x06 Two Slaves Sharing One LTC4316 HARDWIRED ADDRESS 0x34 SCL SCLIN MASTER SCLIN SCLOUT LTC4316 #2 SDAIN SCL SDAIN 00110110 00000010 00110100 SLAVE #1 HARDWIRED ADDRESS 0x34 SLAVE #1 INPUT ADDRESS 0x36 SCL SLAVE #3 SLAVE #3 INPUT ADDRESS 0x32 MASTER 00110010 00000010 00110000 SDA HARDWIRED ADDRESS 0x30 SCL SDA 00110110 00000010 00110100 SDA SDAOUT TRANSLATION BYTE 0x02 SDA HARDWIRED ADDRESS SLAVE #3 0x34 INPUT ADDRESS 0x36 TRANSLATION BYTE 0x02 SCL SCL SCLOUT LTC4316 SDA SLAVE #3 SDAOUT HARDWIRED ADDRESS 0x34 SLAVE #2 SDA HARDWIRED ADDRESS 0x34 Part Comparison SINGLE LTC4316 Y CONNECTED DUAL LTC4317 VCC DUAL LTC4318 VCC VCC SCLIN SCLIN SCLOUT SCLOUT SCLIN SCLIN SCLOUT SCLOUT1 SCLIN1 SCLIN SCLOUT SCLOUT1 SDAIN SDAIN SDAOUT SDAOUT SDAIN SDAIN SDAOUT SDAOUT1 SDAIN1 SDAIN SDAOUT SDAOUT1 XORH XORH READY XORH1 XORH READY1 XORH1 XORH XORL XORL XORL1 XORL XORL1 XORL ENABLE READY ENABLE ENABLE1 GND READY ENABLE1 ENABLE CHANNEL1 SCLIN READY READY1 ENABLE CHANNEL1 SCLOUT SCLOUT2 SCLIN2 SCLIN SCLOUT SCLOUT2 SDAIN SDAOUT SDAOUT2 SDAIN2 SDAIN SDAOUT SDAOUT2 XORH2 XORH READY2 XORH2 XORH READY2 XORL2 XORL XORL2 XORL ENABLE2 GND READY ENABLE CHANNEL2 ENABLE2 GND READY ENABLE CHANNEL2 www.linear.com/4316 n 1-800-4-LINEAR 0315A