![](http://datasheet.mmic.net.cn/Linear-Technology/LTC4314IGN-PBF_datasheet_98040/LTC4314IGN-PBF_17.png)
LTC4314
17
4314f
APPLICATIONS INFORMATION
Figure 11. SDA, SCL Hot Swap and Operation with a Non-Compliant I2C Device
LTC4314
GND
VCC
VCC2
4314 F12
SCLOUT1
SDAOUT1
SCLOUT4
SDAOUT4
SCLOUT1
SDAOUT1
SCLOUT4
SDAOUT4
SCLIN
SDAIN
ENABLE1
ENABLE2
ENABLE3
ENABLE4
ACC
DISCEN
FAULT
SCLIN
SDAIN
ENABLE1
ENABLE2
ENABLE3
ENABLE4
3.3V
FAULT
R3
10k
R2
10k
R1
10k
C1
0.01μF
C2
0.01μF
3.3V
1.8V
R5
10k
R4
10k
C3
0.01μF
5V
R7
10k
R6
10k
Figure 12. Level Shifting Down to 1.8V Using the LTC4314. VCC2 Is Grounded to Disable the Rise Time Accelerator
on the Low Voltage Bus. ENABLE2-4 Must Be Low Whenever ENABLE1 Is High
3.3V to 1.8V is illustrated in Figure 12, where a 3.3V input
voltage level is translated to a 1.8V output voltage level on
channel 1. Tying VCCto3.3Vsatisesequation5.Grounding
VCC2 disables the RTA on the low voltage channel. VMIN
defaults to VCC under these conditions, making the buf-
fer turn off voltage 0.99V. Channels 2-4 must be disabled
when channel 1 is enabled. A similar voltage translation
can also be performed going from a 3.3V bus supply on
the output side to a 1.8V bus supply on the input side if
ACC is tied high to disable the input RTA and if VCC and
VCC2 are tied to the output side bus supply.
LTC4314
GND
VCC
VCC2
4314 F11
SCLOUT1
SDAOUT1
SCLOUT4
SDAOUT4
SCLIN
SDAIN
ENABLE1
ENABLE2
ENABLE3
ENABLE4
ACC
DISCEN
FAULT
ENABLE1
ENABLE2
ENABLE3
ENABLE4
3.3V
FAULT
R3
10k
R2
10k
R1
10k
C1
0.01μF
C2
0.01μF
3.3V
R5
10k
R4
10k
5V
R7
10k
R6
10k
I2C
DEVICE
VOL = 0.6V
I2C
DEVICE
IO CARD
CONNECTOR
I2C
DEVICE
IO CARD
CONNECTOR