PCA9601DPZ datasheet(18/31 Pages) NXP

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NXP Semiconductors

PCA9601

Dual bidirectional bus buffer

100 × 2 mV = 200 mV. So for zero current we need to specify -0.35 V and we publish -0.3

V just to have some extra margin.

Remark: You should not be concerned about the transients generated on the wiring

by a PCA9601 in normal applications and that is input to the TX/RX or TY/RY pins of

another PCA9601. Because not all ICs that may be driven by PCA9601 are designed to

tolerate negative transients, in Section 10.2.1 we show they can be managed if required.

002aaf063

voltage (V)

- 2.0

- 0.5

- 1.5

- 1.0

- 10

- 103

- 102

- 10- 1

- 1

- 104

diode current

(mA)

Figure 23. Diode characteristic curve

10.2.1 Example with questions and answers

Question: On a falling edge of TX we measure undershoot at -800 mV at the linked

TX, RX pins of the PCA9601 that is generating the LOW, but the PCA9601 data sheet

specifies minimum -0.3 V. Does this mean that we violate the data sheet absolute

value?

Answer: For PCA9601 the -0.3 V Absolute Maximum rating is not intended to apply

to transients, it is a DC rating. As shown in Figure 24, there is no theoretical reason

for any undershoot at the IC that is driving the bus LOW and no significant undershoot

should be observed when using reasonable care with the ground connection of the

‘scope. It is more likely that undershoot observed at a driving PCA9601 is caused

by local stray inductance and capacitance in the circuit and by the oscilloscope

connections. As shown, undershoot will be generated by PCB traces, wiring, or

cables driven by a PCA9601 because the allowed value of the I2C-bus pull-up resistor

generally is larger than that required to correctly terminate the wiring. In this example,

with no IC connected at the end of the wiring, the undershoot is about 2 V.

PCA9601

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

Product data sheet

Rev. 3.1 — 4 January 2022

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