Fujitsu F2MC-8FX Hardware Manual page 37

Pin Connection
Treatment of Unused Pin
Leaving unused input pins unconnected can cause abnormal operation or latch-up, leaving to permanent
damage. Unused input pins should always be pulled up or down through resistance of at least 2 kΩ. Any
unused input/output pins may be set to output mode and left open, or set to input mode and treated the same
as unused input pins. If there is unused output pin, make it open.
Power Supply Pins
In products with multiple V
device to avoid abnormal operations including latch-up. However, you must connect the pins to external
power supply and a ground line to lower the electro-magnetic emission level, to prevent abnormal
operation of strobe signals caused by the rise in the ground level, and to conform to the total output current
rating.
Moreover, connect the current supply source with the V
impedance.
It is also advisable to connect a ceramic bypass capacitor of approximately 0.1 μF between V
pins near this device.
Mode Pin (MOD)
Connect the mode pin directly to V
To prevent the device unintentionally entering test mode due to noise, lay out the printed circuit board so as
to minimize the distance from the mode pins to V
Use a ceramic capacitor or a capacitor with equivalent frequency characteristics. A bypass capacitor of V
pin must have a capacitance value higher than C
diagram below.
or V pins, the pins of the same potential are internally connected in the
CC SS
or V .
CC SS
Figure 2.1-1 C pin connection diagram
C
CS
CHAPTER 2 HANDLING DEVICES
and V
CC SS
or V and to provide a low-impedance connection.
CC SS
. For connection of smoothing capacitor C
S
pins of this device at the low
and V
CC
, see the
S
SS
CC
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