UPD78F9234MC-5A4-A Datasheet, PDF (411/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

APPENDIX D LIST OF CAUTIONS
Function
Details of
Function
Cautions
(20/20)
Page
Electrical
specifica-
tions ((A2)
grade
product)
Recom-
mended
soldering
conditions
Absolute
maximum ratings
Product quality may suffer if the absolute maximum rating is exceeded even p.356
momentarily for any parameter. That is, the absolute maximum ratings are
rated values at which the product is on the verge of suffering physical
damage, and therefore the product must be used under conditions that ensure
that the absolute maximum ratings are not exceeded.
X1 oscillator
When using the X1 oscillator, wire as follows in the area enclosed by the
broken lines in the above figures to avoid an adverse effect from wiring
capacitance.
p.358
• Keep the wiring length as short as possible.
• Do not cross the wiring with the other signal lines.
• Do not route the wiring near a signal line through which a high fluctuating
current flows.
• Always make the ground point of the oscillator capacitor the same potential
as VSS.
• Do not ground the capacitor to a ground pattern through which a high current
flows.
• Do not fetch signals from the oscillator.
A/D converter
The conversion accuracy may be degraded if the analog input pin is used as _p.365
an alternate I/O port or if a port is changed during A/D conversion.
Lead-free
products
Products with –A or –AX at the end of the part number are lead-free products. p.373
−
For soldering methods and conditions other than those recommended below, _p.373
contact an NEC Electronics sales representative.
Do not use different soldering methods together (except for partial heating). pp.
373, 374
Only the pins of the THD are heated when performing wave soldering.
Make sure that flow solder does not come in contact with the package.
p.374
User’s Manual U17446EJ5V0UD
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