PCA9525

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Product data sheet

Rev. 1 — 25 February 2011

7 of 22

NXP Semiconductors

PCA9525

Simple 2-wire bus buffer

9.1 Bidirectional data buffer

that side of the buffer control over the direction of the buffer. For the purpose of this one

LOW-going pulse, that side now becomes the ‘input’ (be it SDA_IN or SDA_OUT).

‘output’ is released and will rise as fast as it is permitted by the load and pull-up to which it

is attached. (Assuming, of course, that the ‘output’ is not otherwise held LOW by some

other device on the bus on that side of the buffer.)

immediately gain control and now become the ‘input’. What was the ‘input’ will now

become the ‘output’, and the process will repeat as above, but in the opposite direction.

Fig 5.

Typical input levels versus supply voltage

Fig 6.

voltage

Fig 7.

Typical LOW-level output voltage versus

pull-up resistance

Fig 8.

Typical LOW-level output voltage versus

ambient temperature

2

3

1

4

5

(V)

0

26

5

34

002aaf333

400

600

200

800

1000

(V)

0

26

5

34

002aaf334

+25

°C

−40 °C

40

60

20

80

100

(mV)

0

010

8

46

2

002aaf335

2.7 V

100

200

300

(mV)

0

−50

150

100

050

002aaf336

2.7 V