MB95310L/370L Series
Document Number: 002-07519 Rev. *A
Page 23 of 80
(Continued)
9. Notes On Device Handling
■
Preventing latch-ups
When using the device, ensure that the voltage applied does not exceed the maximum voltage rating.
In a CMOS IC, if a voltage higher than V
CC
or a voltage lower than V
SS
is applied to an input/output pin that is neither a
medium-withstand voltage pin nor a high-withstand voltage pin, or if a voltage out of the rating range of power supply voltage
mentioned in “18.1 Absolute Maximum Ratings” of “
” is applied to the V
CC
pin or the V
SS
pin, a latch-up may
occur.
When a latch-up occurs, power supply current increases significantly, which may cause a component to be thermally destroyed.
■
Stabilizing supply voltage
Supply voltage must be stabilized.
A malfunction may occur when power supply voltage fluctuates rapidly even though the fluctuation is within the guaranteed
operating range of the V
CC
power supply voltage.
As a rule of voltage stabilization, suppress voltage fluctuation so that the fluctuation in V
CC
ripple (p-p value) at the commercial
frequency (50 Hz/60 Hz) does not exceed 10% of the standard V
CC
value, and the transient fluctuation rate does not exceed 0.1
V/ms at a momentary fluctuation such as switching the power supply.
■
Notes on using the external clock
When an external clock is used, oscillation stabilization wait time is required for power-on reset, wake-up from subclock mode or
stop mode.
Type
Circuit
Remarks
Q
■
CMOS output
■
LCD output
■
Hysteresis input
R
■
CMOS output
■
LCD power supply
■
Hysteresis input
N-ch
P-ch
Digital output
Digital output
LCD output
LCD control
Hysteresis input
Standby control
External interrupt
control
N-ch
P-ch
Digital output
Digital output
LCD control
Standby control
Hysteresis input
LCD internal divider
resistor I/O
