C0402C0G1C010C020BC Datasheet, PDF (22/35 Pages) TDK Electronics – Commercial Grade ( General (Up to 50V) )

BR25G128-3
Datasheet
Noise Countermeasures
1. Vcc Noise (bypass capacitor)
When noise or surge gets in the power source line, malfunction may occur, therefore, for removing these, it is
recommended to attach a bypass capacitor (0.1µF) between IC Vcc and GND. At that time, attach it as close to IC as
possible.
And, it is also recommended to attach a bypass capacitor between board Vcc and GND.
2. SCK Noise
When the rise time of SCK (t_RC) is long, and a certain degree or more of noise exists, malfunction may occur owing to
clock bit displacement. To avoid this, a Schmitt trigger circuit is built in SCK input. The hysteresis width of this circuit is set
about 0.2V, if noises exist at SCK input, set the noise amplitude 0.2Vp-p or below. And it is recommended to set the rise
time of SCK (t_RC) 100ns or below. In the case when the rise time is 100ns or higher, take sufficient noise
countermeasures. Make the clock rise, fall time as small as possible.
3. WPB Noise
During execution of write status register command, if there exist noises on WPB pin, mistake in recognition may occur
and forcible cancellation may result. To avoid this, a Schmitt trigger circuit is built in WPB input. In the same manner, a
Schmitt trigger circuit is built in CSB input, SI input and HOLDB input too.
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19.Mar.2014 Rev.001