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PCA9512BD Datasheet PDF : 27 Pages
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NXP Semiconductors
PCA9512A; PCA9512B
Level shifting hot swappable I2C-bus and SMBus bus buffer
In addition, regardless of the bus capacitance, always choose RPU 65.7 k for
VCC = 5.5 V maximum, RPU 45 k for VCC = 3.6 V maximum. The start-up circuitry
requires logic HIGH voltages on SDAOUT and SCLOUT to connect the backplane to the
card, and these pull-up values are needed to overcome the precharge voltage. See the
curves in Figure 5 and Figure 6 for guidance in resistor pull-up selection.
50
RPU
(kΩ)
40
30
20
10
Rmax = 45 kΩ
(1)
rise time = 300 ns(2)
rise time = 20 ns
Rmin = 1 kΩ
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0
0
100
200
300
400
Cb (pF)
(1) Unshaded area indicates recommended pull-up, for rise time < 300 ns, with rise time accelerator turned on.
(2) Rise time accelerator off.
Fig 5. Bus requirements for 3.3 V systems
70
RPU
(kΩ)
60
Rmax = 65.7 kΩ
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50
(1)
40
rise time = 300 ns(2)
30
20
10
0
0
rise time = 20 ns
Rmin = 1.7 kΩ
100
200
300
400
Cb (pF)
(1) Unshaded area indicates recommended pull-up, for rise time < 300 ns, with rise time accelerator turned on.
(2) Rise time accelerator off.
Fig 6. Bus requirements for 5 V systems
PCA9512A_PCA9512B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 1 March 2013
© NXP B.V. 2013. All rights reserved.
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