PCA9601DP datasheet(20/31 Pages) NXP

20 / 31 page

NXP Semiconductors

PCA9601

Dual bidirectional bus buffer

002aaf079

time (ns)

voltage

(V)

- 2

horizontal scale = 62.5 ns/div

send

receive

5 V

PCA9601

send

300 Ω

5 V

2 meter

cable

5 V

300 Ω

GND

receive

5 V

Figure 25. Wiring transients limited by the diodes in PCA9601

Question: If we input 800 mV undershoot at TX, RX pins, what kind of problem is

expected?

Answer: When that undershoot is generated by another PCA9601 and is simply the

result of the system wiring, then there will be no problems.

Question: Will we have any functional problem or reliability problem?

Answer: No.

Question: If we add 100 Ω to 200 Ω at signal line, the overshoot becomes slightly

smaller. Is this a good idea?

Answer: No, it is not necessary to add any resistance. When the logic signal

generated by TX or TY of PCA9601 drives long traces or wiring with ICs other than

PCA9601 being driven, then adding a Schottky diode (BAT54A) as shown in Figure 26

will clamp the wiring undershoot to a value that will not cause conduction of the IC’s

internal diodes.

PCA9601

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

Product data sheet

Rev. 3.1 — 4 January 2022

20 / 31

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