PCA9512ADP Просмотр технического описания (PDF) - Philips Electronics

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PCA9512ADP

Level shifting hot swappable I2C-bus and SMBus bus buffer

Philips Electronics 

Philips Semiconductors

PCA9512A

Level shifting hot swappable I2C-bus and SMBus bus buffer

30

RPU

(kΩ)

20

10

002aab582

Rmax = 24 kΩ

rise time > 300 ns

recommended

pull-up

20

RPU

(kΩ)

15

10

5

002aab583

Rmax = 16 kΩ

rise time > 300 ns

recommended

pull-up

0

0

100

200

300

400

Cb (pF)

Fig 5. Bus requirements for 3.3 V systems

0

0

100

200

300

400

Cb (pF)

Fig 6. Bus requirements for 5 V systems

8.8 Hot swapping and capacitance buffering application

Figure 7 through Figure 9 illustrate the usage of the PCA9512A 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 time 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

PCA9512A drives 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.

PCA9512A_1

Product data sheet

Rev. 01 — 7 October 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

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