Philips Semiconductors

Product data sheet

PCA9513; PCA9514

2004 Oct 05

8

Hot Swapping and Capacitance Buffering

Application

Figures 9 through 12 illustrate the usage of the PCA9513 and

PCA9514 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

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 PCA9513 or PCA9514 drives the capacitance of

everything on the card and the backplane must drive only the 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.

C1

0.01

µF

R4

10 k

Ω

R5

10 k

Ω

POWER SUPPLY

HOT SWAP

I/O PERIPHERAL CARD 1

R6

10 k

Ω

ENABLE

SDAIN

SCLIN

SDAOUT

SCLOUT

READY

GND

CARD1_SDA

CARD1_SCL

R1

10 k

Ω

R2

10 k

Ω

SDA

SCL

BD_SEL

BACKPLANE

BACKPLANE

CONNECTOR

C3

0.01

µF

R8

10 k

Ω

R9

10 k

Ω

POWER SUPPLY

HOT SWAP

I/O PERIPHERAL CARD 2

R10

10 k

Ω

ENABLE

SDAIN

SCLIN

SDAOUT

SCLOUT

GND

CARD2_SDA

CARD2_SCL

C5

0.01

µF

R12

10 k

Ω

R13

10 k

Ω

POWER SUPPLY

HOT SWAP

I/O PERIPHERAL CARD N

R14

10 k

Ω

ENABLE

SDAIN

SCLIN

SDAOUT

SCLOUT

GND

CARDN_SDA

CARDN_SCL

SW02126

R11

10 k

Ω

R7

10 k

Ω

R3

10 k

Ω

READY

READY

Figure 9. Hot swapping multiple I/O cards into a backplane using the PCA9514 in a CompactPCI, VME, and AdvancedTCA system