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UPC1934 Datasheet(Fiches technique) 19 Page - NEC

Numéro de pièce UPC1934
Description  DC-DC CONVERTER CONTROL IC
Télécharger  20 Pages
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Fabricant  NEC [NEC]
Site Internet  http://www.nec.com/
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Data Sheet G13567EJ3V0DS00
19
µµµµ PC1934
NOTES FOR BiCMOS DEVICES
1
PRECAUTION AGAINST ESD FOR SEMICONDUCTORS
Note:
Strong electric field, when exposed to a 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.
2
HANDLING OF UNUSED INPUT PINS
Note:
No connection for 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. Input levels of devices must be fixed high or low by using a pull-up or pull-
down circuitry.
Each unused pin should be connected to VDD 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.
3
STATUS BEFORE INITIALIZATION OF BiCMOS DEVICES
Note:
Power-on does not necessarily define initial status of device. Production process of BiCMOS 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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