pca9601 NXP Semiconductors, pca9601 Datasheet - Page 23

• Manufacturer Part Number: pca9601
• Description: Dual Bidirectional Bus Buffer
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCA9601_1
Product data sheet
Fig 26. Wiring transients limited by a Schottky diode
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
the wiring undershoot to a value that will not cause conduction of the IC’s internal
diodes.
All information provided in this document is subject to legal disclaimers.
voltage
SX
(V)
5 V
Rev. 01 — 28 May 2010
−2
RX
PCA9601
TX
6
4
2
0
horizontal scale = 62.5 ns/div
send
send
5 V
300 Ω
2 meter
cable
receive
5 V
1 / 2 BAT54A
300 Ω
receive
time (ns)
Dual bidirectional bus buffer
GND
RX
TX
002aaf080
5 V
SX
Figure 26
PCA9601
© NXP B.V. 2010. All rights reserved.
will clamp
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