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參數(shù)資料
| 型號： | UPD75P216ACW |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT SINGLE-CHIP MICROCOMPUTER |
| 中文描述： | 4位單片機(jī) |
| 文件頁數(shù)： | 27/28頁 |
| 文件大?。?/td> | 281K |
| 代理商： | UPD75P216ACW |
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μ
PD75P216A
27
NOTES FOR CMOS DEVICES
PRECAUTION AGAINST ESD FOR SEMICONDUCTORS
Note:
Strong electric field, when exposed to a MOS device, can cause destruction of the gate
oxide and ultimately degrade the device operation. Steps must be taken to stop generation
of static electricity as much as possible, and quickly dissipate it once, when it has
occurred. Environmental control must be adequate. When it is dry, humidifier should be
used. It is recommended to avoid using insulators that easily build static electricity.
Semiconductor devices must be stored and transported in an anti-static container, static
shielding bag or conductive material. All test and measurement tools including work
bench and floor should be grounded. The operator should be grounded using wrist strap.
Semiconductor devices must not be touched with bare hands. Similar precautions need
to be taken for PW boards with semiconductor devices on it.
HANDLING OF UNUSED INPUT PINS FOR CMOS
Note:
No connection for CMOS device inputs can be cause of malfunction. If no connection is
provided to the input pins, it is possible that an internal input level may be generated due
to noise, etc., hence causing malfunction. CMOS devices behave differently than Bipolar
or NMOS devices. Input levels of CMOS devices must be fixed high or low by using a pull-
up or pull-down circuitry. Each unused pin should be connected to V
DD
or GND with a
resistor, if it is considered to have a possibility of being an output pin. All handling related
to the unused pins must be judged device by device and related specifications governing
the devices.
STATUS BEFORE INITIAIZATION OF MOS DEVICES
Note:
Power-on does not necessarily define initial status of MOS device. Production process of
MOS does not define the initial operation status of the device. Immediately after the
power source is turned ON, the devices with reset function have not yet been initialized.
Hence, power-on does not guarantee out-pin levels, I/O settings or contents of registers.
Device is not initialized until the reset signal is received. Reset operation must be
executed immediately after power-on for devices having reset function.
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