參數(shù)資料
型號(hào)： MB90F549G
廠商： Fujitsu Limited
英文描述： Octal Bus Transceivers And Registers With 3-State Outputs 24-CDIP -55 to 125
中文描述： 16位微控制器專有
文件頁(yè)數(shù)： 15/56頁(yè)
文件大?。?/td> 757K
代理商： MB90F549G
MB90540/545 Series
15
I
HANDLING DEVICES
(1)
Preventing latch-up
CMOS IC chips may suffer latch-up under the following conditions:
A voltage higher than Vcc or lower than Vss is applied to an input or output pin.
A voltage higher than the rated voltage is applied between Vcc and Vss.
The AVcc power supply is applied before the Vcc voltage.
Latch-up may increase the power supply current drastically, causing thermal damage to the device.
For the same reason, care must also be taken in not allowing the analog power-supply voltage (AVcc, AVRH,
DVcc) to exceed the digital power-supply voltage.
(2)
Handling unused input pins
Leaving unused input pins open may result in misbehavior or latch up and possible permanent damage of the
device. Therefor they must be pulled up or pulled down through resistors. In this case those resistors should be
more than 2 k
.
Unused bi-directional pins should be set to the output state and can be left open, or the input state with the
above described connection.
(3)
Using external clock
To use external clock, drive X0 pin only and leave X1 pin unconnected.
Below is a diagram of how to use external clock.
(4)
Not using subclock mode
Oscillations must be connected to the X0A and X1A, even when a subclock is not used.
(5)
Power supply pins (Vcc/Vss)
In products with multiple V
CC
or V
SS
pins, the pins of a same potential are internally connected in the device to
avoid abnormal operations including latch-up. However you must connect the pins to an external power 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 current rating.
Make sure to connect V
CC
and V
SS
pins via the lowest impedance to power lines.
It is recommended to provide a bypass capacitor of around 0.1
μ
F between V
CC
and V
SS
pins near the device.
X0
X1
MB90540/545 Series
Open
Vcc
Vss
Vss
Vcc
Vss
Vcc
MB90540/545
Series
Vcc
Vss
Vcc
Vss
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