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UPD70F3218 Datasheet(PDF) 3 Page - NEC

No. de Pieza. UPD70F3218
Descripción  32-Bit Single-Chip Microcontrollers
Descarga  884 Pages
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Fabricante  NEC [NEC]
Página de inicio  http://www.nec.com/
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UPD70F3218 Datasheet(HTML) 3 Page - NEC

 
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User’s Manual U16889EJ1V0UD
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VOLTAGE APPLICATION WAVEFORM AT INPUT PIN
Waveform distortion due to input noise or a reflected wave may cause malfunction. If the input of the
CMOS device stays in the area between VIL (MAX) and VIH (MIN) due to noise, etc., the device may
malfunction. Take care to prevent chattering noise from entering the device when the input level is fixed,
and also in the transition period when the input level passes through the area between VIL (MAX) and
VIH (MIN).
HANDLING OF UNUSED INPUT PINS
Unconnected CMOS device inputs can be cause of malfunction. If an input pin is unconnected, it is
possible that an internal input level may be generated due to noise, etc., causing malfunction. CMOS
devices behave differently than Bipolar or NMOS devices. Input levels of CMOS devices must be fixed
high or low by using pull-up or pull-down circuitry. Each unused pin should be connected to VDD or GND
via a resistor if there is a possibility that it will be an output pin. All handling related to unused pins must
be judged separately for each device and according to related specifications governing the device.
PRECAUTION AGAINST ESD
A 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 when it has occurred.
Environmental control must be
adequate. When it is dry, a humidifier should be used. It is recommended to avoid using insulators that
easily build up 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
benches and floors should be grounded.
The operator should be grounded using a wrist strap.
Semiconductor devices must not be touched with bare hands. Similar precautions need to be taken for
PW boards with mounted semiconductor devices.
STATUS BEFORE INITIALIZATION
Power-on does not necessarily define the initial status of a MOS device. Immediately after the power
source is turned ON, devices with reset functions have not yet been initialized. Hence, power-on does
not guarantee output pin levels, I/O settings or contents of registers. A device is not initialized until the
reset signal is received. A reset operation must be executed immediately after power-on for devices
with reset functions.
NOTES FOR CMOS DEVICES
Purchase of NEC Electronics I
2C components conveys a license under the Philips I2C Patent Rights to
use these components in an I
2C system, provided that the system conforms to the I2C Standard
Specification as defined by Philips.
Caution:
µPD70F3217H, 70F3217HY, 70F3218H, and 70F3218HY use SuperFlash® technology
licensed from Silicon Storage Technology, Inc.
Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in
the United States and/or other countries.
PC/AT is a trademark of International Business Machines Corporation.
SPARCstation is a trademark of SPARC International, Inc.
Solaris and SunOS are trademarks of Sun Microsystems, Inc.
SuperFlash is a registered trademark of Silicon Storage Technology, Inc. in several countries
including the United States and Japan.


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