PCA9600DP datasheet(18/32 Pages) NXP

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NXP Semiconductors

PCA9600

Dual bidirectional bus buffer

- 1

VCC

(V)

time (ns)

900

002aac933

200

100

300 400 500 600 700 800

(1)

(2)

(1)

(2)

1. TX/RX output.

2. SX input.

Figure 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

VCC

(V)

time (ns)

900

002aac934

200

100

300 400 500 600 700 800

(1)

(2)

(1)

(2)

1. RX input.

2. SX output.

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

10.2 Negative undershoot below absolute minimum value

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

testing but it was not damaged. Whenever there is current flowing in any of these diodes

PCA9600

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 6.1 — 20 December 2021

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