Datasheet

LTC4315
12
4315f
APPLICATIONS INFORMATION
LIVE INSERTION, CAPACITANCE BUFFERING AND
LEVEL TRANSLATION APPLICATION
Figures 6 illustrates an application of the LTC4315 that
takes advantage of the LTC4315’s Hot Swap, capacitance
buffering and level translation features. If the I/O cards
were plugged directly into the backplane without LTC4315
buffers, all of the backplane and card capacitances would
directly add together, making rise time requirements dif-
ficult to meet. Placing an LTC4315 on the edge of each
card isolates the card capacitance from the backplane.
For a given I/O card, the LTC4315 drives the capacitance
of everything on the card and devices on the backplane
must drive only the small capacitance of the LTC4315
which is <10pF.
Figure 6. LTC4315 in an I
2
C Hot Swap Application with a Staggered Connector
R7
10k
R5
10k
R6
10k
LTC4315
GND
V
CC
V
CC2
ACC
SCLOUT
SDAOUT
DISCEN
READY
FAULT
SCLIN
SDAIN
ENABLE
C2
0.01µF
CARD 1_SCL
CARD 1_SDA
CARD N_SCL
CARD N_SDA
C1
0.01µF
R10
10k
4315 F06
R8
10k
I/O PERIPHERAL CARD N
I/O PERIPHERAL CARD 1
CARD
CONNECTOR
BACKPLANE
CONNECTOR
R9
10k
LTC4315
GND
V
CC
V
CC2
ACC
SCLOUT
SDAOUT
DISCEN
READY
FAULT
SCLIN
SDAIN
ENABLE
C4
0.01µF
C3
0.01µF
sss
R3
10k
R4
10k
R1
10k
R2
10k
READY
FAULT
SCL
SDA
ENABLE 1
5V
3.3V
ENABLE N
sss