UPD75218 NEC, UPD75218 Datasheet - Page 61

• Manufacturer Part Number: UPD75218
• Description: 4-BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

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Countermeasures against static electricity for all MOSs
Caution
CMOS-specific handling of unused input pins
Caution
Statuses of all MOS devices at initialization
Caution
When handling MOS devices, take care so that they are not electrostatically charged.
Strong static electricity may cause dielectric breakdown in gates. When transporting or
storing MOS devices, use conductive trays, magazine cases, shock absorbers, or metal
cases that NEC uses for packaging and shipping. Be sure to ground MOS devices during
assembling. Do not allow MOS devices to stand on plastic plates or do not touch pins.
Also handle boards on which MOS devices are mounted in the same way.
Hold CMOS devices at a fixed input level.
Unlike bipolar or NMOS devices, if a CMOS device is operated with no input, an
intermediate-level input may be caused by noise. This allows current to flow in the CMOS
device, resulting in a malfunction. Use a pull-up or pull-down resistor to hold a fixed input
level. Since unused pins may function as output pins at unexpected times, each unused
pin should be separately connected to the V
If handling of unused pins is documented, follow the instructions in the document.
The initial status of a MOS device is unpredictable when power is turned on.
Since characteristics of a MOS device are determined by the amount of ions implanted
in molecules, the initial status cannot be determined in the manufacture process. NEC
has no responsibility for the output statuses of pins, input and output settings, and the
contents of registers at power on. However, NEC assures operation after reset and items
for mode setting if they are defined.
When you turn on a device having a reset function, be sure to reset the device first.
Cautions on CMOS Devices
DD
or GND pin through a resistor.
PD75218
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