Device Handling Precautions - Fujitsu F2MC-8FX Hardware Manual

CHAPTER 2 HANDLING DEVICES
2.1

Device Handling Precautions

This section summarizes the precautions on the device's power supply voltage and pin
treatment.
Device Handling Precautions
Preventing Latch-up
Care must be taken to ensure that maximum voltage ratings are not exceeded when they are used.
Latch-up may occur on CMOS ICs if voltage higher than V
output pins other than medium- and high-withstand voltage pins or if higher than the rating voltage is
applied between V
When latch-up occurs, power supply current increases rapidly and might thermally damage elements.
Stable Supply Voltage
Supply voltage should be stabilized.
A sudden change in power-supply voltage may cause a malfunction even within the guaranteed operating
range of the Vcc power-supply voltage.
For stabilization, in principle, keep the variation in Vcc ripple (p-p value) in a commercial frequency range
(50/60 Hz) not to exceed 10% of the standard Vcc value and suppress the voltage variation so that the
transient variation rate does not exceed 0.1 V/ms during a momentary change such as when the power
supply is switched.
Precautions for Use of External Clock
Even when an external clock is used, oscillation stabilization wait time is required for power-on reset,
wake-up from subclock mode or stop mode.
22
pin and V pin.
CC SS
or lower than V is applied to input and
CC SS