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CHAPTER 1 OVERVIEW
1.7 Handling of Device
1.7
Handling of Device
This section describes the precautions when handling devices.
■ Precautions when Handling Devices
●
Preventing Latch-up, Turning on Power Supply
Latch-up may occur on CMOS IC under the following conditions:
• If a voltage higher than V
• If a voltage higher than the rated voltage is applied between V
• If the AV
Ensure that you apply a voltage to the analog power supply at the same time as V
digital power supply (when you perform power-off, turn off the analog power supply first or at the same
time as V
When latch-up occurs, power supply current increases rapidly and might thermally damage elements. When
using CMOS IC, take great care to prevent the occurrence of latch-up.
●
Handling of power supply pin (V
To prevent malfunctions of strobe signals due to the rise in the ground level, lower unnecessary
electromagnetic emission level, and prevent latch-up in designing devices if multiple V
exist, ensure that you must connect all power supply pins to an external power or a ground line in order to
conform with the total output current rating. And, pay attention to connecting the power sources through as
low impedance as possible to V
capacitor of around 0.1μF between V
●
Crystal oscillation circuit
Noise around X0/X1 pins may cause the malfunctions of a device. Ensure that you should provide bypass
capacitors via shortest distances from X0/X1 and crystal oscillator (or ceramic oscillator) to ground lines,
and try best to prevent lines of crystal oscillation circuits from crossing the lines of other circuits. It is
highly recommended that you should use a printed circuit board artwork because you can expect stable
operations from it.
Please ask the crystal maker to evaluate the oscillational characteristics of the crystal and this device.
16
or lower than V
CC
power supply is turned on before the V
CC
and the digital power supply).
CC
/V
CC
SS
CC
FUJITSU MICROELECTRONICS LIMITED
is applied to input and output pins,
SS
voltage.
CC
)
/V
of a device. In addition, it is recommended to provide a bypass
SS
/V
pins near the device.
CC
SS
MB90335 Series
pin to V
pin,
CC
SS
or after you turn on the
CC
CM44-10137-6E
or V
pins
CC
SS
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