Datasheet

Section 23 Clock Pulse Generator
Rev. 4.00 Jun 06, 2006 page 673 of 1004
REJ09B0301-0400
Table 23.3 Crystal Resonator Parameters
Frequency (MHz)24810121620
R
S
max (Ω) 500 120 80 70 60 50 40
C
0
max (pF) 7777777
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 23.4.
When designing the board, place the crystal resonator and its load capacitors as close as possible
to the XTAL and EXTAL pins.
C
L2
Signal A Signal B
C
L1
H8S/2138 Group or
H8S/2134 Group
chip
XTAL
EXTAL
Avoid
Figure 23.4 Example of Incorrect Board Design