
MB91350A Series
DS07-16503-5E
93
(Continued)
*7 :
Relevant pins : Ports 2, 3, 4, 5, 6, 8, 9, A, H, I, K, M, N, O and AN (A/D input) : MB91F353A/353A/352A/351A
Ports 2, 3, 4, 5, 6, 8, 9, A, B, C, G, H, I, J, K, M, N, O, P and AN (A/D input) :
MB91F355A/F356B/F357B/355A/354A
Use within recommended operating conditions.
Use at DC voltage (current).
+ B signals are input signals that exceed the VCC voltage.
A limiting resistance should always be applied to +B signals by connecting the resistance between the +B
signal and the microcontroller.
The value of the limiting resistance should be set so that when the + B signal is applied the input current to
the microcontroller pin does not exceed rated values, either instantaneously or for prolonged periods.
Note that when the microcontroller drive current is low, such as in low power consumption mode, the + B
input potential can increase the potential at the VCC pin via a protective diode, possibly affecting other
devices.
Note that if a + B input is applied when the microcontroller is off (not fixed at 0 V), power is supplied
through the pin, possibly causing the microcontroller to partially operate.
Note that if a + B input is applied when the power supply is turned on, power is supplied through the pin,
possibly resulting in a power-supply voltage at which power-on reset does not work.
Ensure that a + B input pin does not form an open circuit.
Note that analog I/O pins other than the A/D input pins (such as the LCD drive and comparator input pins)
cannot input
+ B.
Sample recommended circuits :
*8 : VI must not exceed the rated voltage. However, If the maximum current to/from an input is limited by some
means using external components, the ICLAMP rating supersedes the VI rating.
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.
Vcc
P-ch
R
N-ch
Protective diode
Limiting
resistance
+ B input (0 V to 16 V)
Input/output equivalent circuits