Datasheet

Section 5 Clock Pulse Generators
Rev. 2.00 Sep. 23, 2005 Page 66 of 444
REJ09B0068-0200
5.1.1 Connecting Crystal Resonator
Figure 5.3 shows a typical method of connecting a crystal resonator. An AT-cut parallel-resonance
crystal resonator should be used. Figure 5.4 shows the equivalent circuit of a crystal resonator. A
resonator having the characteristics given in table 5.1 should be used.
1
2
C
1
C
2
OSC
OSC
C = C = 12 pF ±20%
1
2
Figure 5.3 Typical Connection to Crystal Resonator
C
S
C
0
R
S
OSC
1
OSC
2
L
S
Figure 5.4 Equivalent Circuit of Crystal Resonator
Table 5.1 Crystal Resonator Parameters
Frequency (MHz) 2 4 8 10 16 20
R
S
(max) 500 Ω 120 Ω 80 Ω 60 Ω 50 Ω 40 Ω
C
0
(max) 7 pF 7 pF 7 pF 7 pF 7 pF 7 pF