LTC4317_15 Datasheet, PDF (1/14 Pages) Linear Technology – Dual I2C/SMBus Address Translator

LTC4317
Dual I²C/SMBus
Address Translator
Features
nn _{Allows Multiple Slaves with the Same Address to}
Coexist on the Same Bus
nn _{Resistor Configurable Address Translation}
nn _{No Software Programming Required}
nn _{Compatible with SMBus, I}²_{C and I}²_{C Fast Mode}
nn _{Pass-Through Mode Allows General Call Addressing}
nn _{±4kV HBM ESD Ruggedness}
nn _{Level Translation for 2.5V, 3.3V and 5V Buses}
nn _{Stuck Bus Timeout}
nn _{Prevents SDA and SCL Corruption During Live Board}
Insertion and Removal
nn _{Support Bus Hot Swap™}
nn _{16-Lead DFN 5mm × 3mm Package}
Applications
nn _I²_{C, SMBus Address Expansion}
nn _{Address Translation}
nn _Servers
nn _Telecom
Description
The LTC^®4317 enables the hardwired address of one or more
I²C or SMBus slave device to be translated to a different ad-
dress. This allows slaves with the same hardwired address to
coexist on the same bus. Only discrete resistors are needed
to select the new address and no software programming is
required. Up to 127 different address translations are available.
The LTC4317 incorporates a pass-through mode which dis-
ables the address translation and allows general call address-
ing by the master. The LTC4317 is designed to automatically
recover from abnormal bus conditions like bus stuck low or
premature STOP bits.
The LTC4317 has two output channels for two different sets
of slaves. The input channels are tied together to a com-
mon set of pins to reduce the pin count and package size.
PART NUMBER
NUMBER OF INPUT NUMBER OF OUTPUT
CHANNELS
CHANNELS
LTC4316
1
1
LTC4317
1
2
LTC4318
2
2
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. Patent pending.
Typical Application
3.3V
SCL
MASTER
SDA
SENDS
ADDRESS 0x34
3.3V
SCLIN
V_CC
SCLOUT1
TRANSLATES
BY 0x02
LTC4317
SDAIN SDAOUT1
ENABLE1 READY1
ENABLE2 READY2
SCLOUT2
TRANSLATES
BY 0x04
SDAOUT2
XORH2
GND
XORH1
XORL2 XORL1
5V
SCL
SLAVE# 1
ADDRESS
0x36
SDA
RECEIVES
ADDRESS 0x36
START
ADDRESS BITS
R/W ACK
BIT BIT
a6
a5
a4
a3
a2
a1
a0
SCLIN
5V
SCL
SLAVE# 2
ADDRESS
0x36
SDA
RECEIVES
ADDRESS 0x30
SDAIN
TRANSLATION
BYTE
SDAOUT1
0
0
1
1
0
1
0
0 = 0x34
0
0
0
0
0
0
1
0 = 0x02
0
0
1
1
0
1
1
0 = 0x36
4317 TA01b
3.3V
845k 61.9k 93.1k
4317 TA01a
4317f
For more information www.linear.com/LTC4317
1