PCA9600 datasheet(18/30 Pages) NXP

Part #	PCA9600

Description	Dual bidirectional bus buffer

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Manufacturer	NXP [NXP Semiconductors]

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18 / 30 page

PCA9600_4

Product data sheet

Rev. 04 — 11 November 2009

18 of 30

NXP Semiconductors

PCA9600

Dual bidirectional bus buffer

10.2 Negative undershoot below absolute minimum value

The reason why the IC pin reverse voltage on pins TX and RX in Table 5 “Limiting values”

is speciﬁed at such a low value,

−0.3 V, is not that applying larger voltages is likely to

cause damage but that it is expected that, in normal applications, there is no reason why

larger DC voltages will be applied. This ‘absolute maximum’ speciﬁcation is intended to be

a DC or continuous ratings and the nominal DC I2C-bus voltage LOW usually does not

even reach 0 V. Inside PCA9600 at every pin there is a large protective diode connected

to the GND pin and that diode will start to conduct when the pin voltage is more than

about

−0.55 V with respect to GND at 25 °C ambient.

Figure 22 shows the measured characteristic for one of those diodes inside PCA9600.

The plot was made using a curve tracer that applies 50 Hz mains voltage via a series

resistor, so the pulse durations are long duration (several milliseconds) and are reaching

peaks of over 2 A when more than

−1.5 V is applied. The IC becomes very hot during this

(1) TX output.

(2) SX input.

(1) TX/RX output.

(2) SX input.

Fig 19. Propagation SX to TX with VRX =VCC = 3.3 V

(SX pull-up to 3.3 V; TX pull-up to 5.7 V)

Fig 20. Propagation SX to TX with RX tied to TX;

VCC = 3.3 V (SX pull-up to 3.3 V; TX pull-up to

5.7 V)

(1) RX input.

(2) SX output.

Fig 21. Propagation RX to SX (SX pull-up to 3.3 V; VCC = 3.3 V; RX pull-up to 4.6 V)

−1

5

3

1

7

VCC

(V)

time (ns)

0

900

002aac932

200

100

300 400 500 600 700 800

0

2

4

6

(1)

(2)

(1)

(2)

−1

5

3

1

7

VCC

(V)

time (ns)

0

900

002aac933

200

100

300 400 500 600 700 800

0

2

4

6

(1)

(2)

(1)

(2)

−1

5

3

1

7

VCC

(V)

time (ns)

0

900

002aac934

200

100

300 400 500 600 700 800

0

2

4

6

(1)

(2)

(1)

(2)

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