(b)
(a)
C,
C
'
0-R
EXTAL . .
..
S .XTAL
5 ~ 6
AT - Cut Parallel Resonance Crystal
C
o
=7
pF
Max
Freq.=4.0
MHz @
CL
=24
pF
R S =
50
ohms Max.
Piezoelectric ceramic resonators which
have the
equivalent specifications may
be
used instead
of
crystal oscillators. Follow
ceramic resonator manufacturer's· sug-
gestions for
CO,
C"
and
RS
values.
(e)
NOTE:
Keep
crystal leads and circuit connections
as
short
as
possible.
Figure
7-5.
Crystal
Motional-Arm
Parameters
and
Suggest~d
PC
Board
Layout
B.O
,...-...--------""---.,...---------,
7.0
~
6.0
g 5.0
Q)
::J
g 4.0
U::
o 3.0
~
.5l
2.0
o
'.0
0
0
10
20
VCC=5.25V
TA=25°C
30
40
50
Resistance
(kOl
60
70
Figure
7-:-6.
Typical
Frequency
Selection
for
Resistor
(RC
Oscillator
Option)
7-4
BO
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