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參數(shù)資料
| 型號： | MB90583CA |
| 廠商： | Fujitsu Limited |
| 英文描述： | Octal Bus Transceivers With 3-State Outputs 20-CDIP -55 to 125 |
| 中文描述： | 16位微控制器專有 |
| 文件頁數(shù)： | 19/124頁 |
| 文件大小： | 2639K |
| 代理商： | MB90583CA |
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MB90580C Series
19
I
HANDLING DEVICES
1.
Preventing Latchup
CMOS ICs may cause latchup in the following situations:
When a voltage higher than Vcc or lower than Vss is applied to input or output pins.
When a voltage exceeding the rating is applied between Vcc and Vss.
When AVcc power is supplied prior to the Vcc voltage.
If latchup occurs, the power supply current increases rapidly, sometimes resulting in thermal breakdown of the
device. Use meticulous care not to let it occur.
For the same reason, also be careful not to let the analog power-supply voltage exceed the digital power-supply
voltage.
Handling unused input pins
2.
Unused input pins left open may cause abnormal operation, or latch-up leading to permanent damage. Unused
input pins should be pulled up or pulled down through at least 2 k
resistance.
Unused input/output pins may be left open in output state, but if such pins are in input state they should be
handled in the same way as input pins.
Treatment of the TX and RX pins with the IEBus
TM
unused
3.
When the IEBus is not used, connect a pull-down resistor to the TX pin and a pull-down/pull-up resistor to the
RX pin.
Use of the external clock
4.
When the device uses an external clock, drive only the X0 pin while leaving the X1 pin open (See the illustration
below).
5.
Power Supply Pins (V
CC
/V
SS
)
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, connect the pins external power and ground lines 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 lowest impedance to power lines.
X0
X1
MB90580C series
Open
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