PCA9511 PHILIPS [NXP Semiconductors], PCA9511 Datasheet - Page 8

• Manufacturer Part Number: PCA9511
• Description: Hot swappable I2C and SMBus bus buffer
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
Hot Swapping and Capacitance Buffering
Application
Figures 9 through 11 illustrate the usage of the PCA9510 and
PCA9511 in applications that take advantage of both its hot
swapping and capacitance buffering features. In all of these
applications, note that if the I/O cards were plugged directly into the
backplane, all of the backplane and card capacitances would add
directly together, making rise- and fall-time requirements difficult to
NOTE: The PCA9510 and PCA9511 can be used in any combination depending on the number of rise time accelerators that are needed by the
system. Normally only one PCA9511 would be required per bus.
2004 Oct 05
BD_SEL
Hot swappable I
V
SDA
SCL
CC
10 k
Figure 9. Hot swapping multiple I/O cards into a backplane using the PCA9510 and PCA9511 in a CompactPCI, VME, and
R1
BACKPLANE
R2
10 k
CONNECTOR
BACKPLANE
2
C and SMBus bus buffer
AdvancedTCA system
POWER SUPPLY
POWER SUPPLY
POWER SUPPLY
8
HOT SWAP
HOT SWAP
HOT SWAP
meet. Placing a bus buffer on the edge of each card, however,
isolates the card capacitance from the backplane. For a given I/O
card, the PCA9510 and PCA9511 drive the capacitance of
everything on the card and the backplane must drive only the
capacitance of the bus buffer, which is less than 10 pF, the
connector, trace, and all additional cards on the backplane.
See Application Note AN10160, Hot Swap Bus Buffer for more
information on applications and technical assistance.
ENABLE
SDAIN
SCLIN
ENABLE
SDAIN
SCLIN
ENABLE
SDAIN
SCLIN
R3
10 k
R7
10 k
R11
10 k
V
V
V
GND
GND
GND
I/O PERIPHERAL CARD 1
I/O PERIPHERAL CARD 2
I/O PERIPHERAL CARD N
CC
CC
CC
0.01 F
0.01 F
0.01 F
C1
C3
C5
SDAOUT
SDAOUT
SDAOUT
SCLOUT
SCLOUT
SCLOUT
READY
READY
READY
PCA9510; PCA9511
R4
10 k
R8
10 k
R12
10 k
10 k
10 k
10 k
R5
R9
R13
Product data sheet
10 k
10 k
10 k
R6
R10
R14
CARD1_SDA
CARD1_SCL
CARD2_SDA
CARD2_SCL
CARDN_SDA
CARDN_SCL
SW02126