PCA9512BDP datasheet(9/27 Pages) PHILIPS

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PCA9512A_PCA9512B

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Product data sheet

Rev. 6 — 1 March 2013

9 of 27

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.

(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

(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

Cb (pF)

400

300

200

100

002aae782

RPU

Ω)

Rmax = 45 kΩ

rise time = 20 ns

Rmin = 1 kΩ

rise time = 300 ns(2)

(1)

Cb (pF)

400

300

200

100

002aae783

RPU

Ω)

(1)

Rmax = 65.7 kΩ

rise time = 20 ns

Rmin = 1.7 kΩ

rise time = 300 ns(2)

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