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UPD78323LP Datasheet(PDF) 35 Page - Renesas Technology Corp

Part # UPD78323LP
Description  MOS INTEGRATED CIRCUIT
PDF  88 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD78323LP Datasheet(HTML) 35 Page - Renesas Technology Corp

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33
µPD78323, 78324
Figure 3-2. Externally-Mounted System Clock Generator
(a) Crystal oscillator
Cautions 1. When the system clock oscillator is used, the following points should be noted concerning wiring
within broken lines shown in Figure 3-2, in order to prevent the effects of wiring capacitance, etc.
•
Keep the wiring as short as possible.
•
Do not cross any other signal lines, and keep clear of lines in which a high fluctuating current
flows.
•
Ensure that oscillator capacitor connection points are always at the same potential as VSS. Do not
ground in a ground pattern in which a high current flows.
•
Do not take a signal from the oscillator.
2. When an external clock is input to the X1 pin and the X2 pin is left open, ensure that no loads such
as wiring capacitance are connected to the X2 pin.
(b) External clock
(i) When the inverted phase of an
external clock to be input to the
X1 pin is input to the X2 pin
(ii) When X2 pin is left open
X2
X1
VSS
PD78324
µ
X1
X2
External
Clock
PD78324
µ
X1
X2
Open
External
Clock
PD78324
µ



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