PCA9511A Просмотр технического описания (PDF) - Philips Electronics
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PCA9511A Datasheet PDF : 23 Pages
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Philips Semiconductors
PCA9511A
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
8.9 Hot swapping and capacitance buffering application
Figure 7 through Figure 10 illustrate the usage of the PCA9511A 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
PCA9511A 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.
9397 750 13269
Product data sheet
Rev. 01 — 15 August 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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