upd7566a Renesas Electronics Corporation., upd7566a Datasheet - Page 57

• Manufacturer Part Number: upd7566a
• Description: 4-bit Single-chip Microcomputer
• Manufacturer: Renesas Electronics Corporation.

1 PRECAUTION AGAINST ESD FOR SEMICONDUCTORS
2 HANDLING OF UNUSED INPUT PINS FOR CMOS
3 STATUS BEFORE INITIALIZATION OF MOS DEVICES
Note: Strong electric field, when exposed to a MOS device, can cause destruction of
Note: No connection for CMOS device inputs can be cause of malfunction. If no
Note: Power-on does not necessarily define initial status of MOS device. Production
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.
adequate. When it is dry, humidifier should be used. It is recommended to
avoid using insulators that easily build static electricity.
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.
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
device 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
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.
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 immedi-
ately after power-on for devices having reset function.
NOTES FOR CMOS DEVICES
DD
or GND with a resistor, if it is considered
Environmental control must be
PD7566A, 7566A(A)
Semiconductor
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