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• When using external clock
Even when an external clock is used, the oscillation stabilization wait time is required at the power-on reset
sub-clock mode or the cancellation of the stop mode. Also, as shown in Figure 1.6, when using the
external clock, drive the X0 pin only and leave the X1 pin open.
• Power pins
When plural V
pins and V
CC
internally connected to the device to prevent malfunctions such as latch up. However, always connect all
same electric potential pins to power supply and ground outside the device to prevent decrease of
unnecessary radiation, the malfunction of the strobe signal due to a rise of ground level, and follow the
standards of total output current, etc.
As shown in Figure 1.7, always set all V
pins in the same way as V
normally even in the assured operation range.
Also, consider to connecting the pins to V
the current supply source. It is recommended to connect a bypass capacitor of about 0.1 µF to between
V
and V
of this device near the pins.
CC
SS
GENERAL
Fig. 1.6 Example of using External Clock
pins are provided, pins designed to be at the same electric potential are
SS
power pins to the same potential. Also, handle all V
CC
power pins. If there are plural V
CC
V
CC
V
SS
V
CC
V
SS
Fig. 1.7 Power Input Pins (V
and V
CC
X0
X1
OPEN
MB90420/425 series
or V
CC
SS
V
SS
V
CC
V
SS
V
CC
/V
)
CC
SS
of this device at as low impedance as possible from
SS
1-17
systems, devices will not operate
V
CC
V
SS
power
SS
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