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XTAL
Table 23A-3 Crystal Resonator Parameters
Frequency (MHz) 2
max (Ω)
500
R
S
C
max (pF)
7
0
Note on Board Design: When a crystal resonator is connected, the following points should be
noted:
Other signal lines should be routed away from the oscillator circuit to prevent induction from
interfering with correct oscillation. See figure 23A-4.
When designing the board, place the crystal resonator and its load capacitors as close as possible
to the XTAL and EXTAL pins.
L
Figure 23A-3 Crystal Resonator Equivalent Circuit
4
8
120
80
7
7
Avoid
Signal A Signal B
C
L2
C
L1
Figure 23A-4 Example of Incorrect Board Design
C
L
R
s
EXTAL
AT-cut parallel-resonance type
C
0
12
16
60
50
7
7
H8S/2633 Series
XTAL
EXTAL
20
25
40
40
7
7
963
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