DESCRIPTION
The CX-2 quartz crystal is a high quality extensional mode
resonator. The CX-2 is hermetically sealed in a rugged,
miniature ceramic package, one-fourth the size of an eight-
pin mini-DIP. The CX-2 crystal is manufactured using the
STATEK-developed photolithographic process, and was
designed utilizing the experience acquired by producing
millions of crystals for industrial, commercial, military and
medical applications.
FEATURES
Extensional mode
Ideal for use with microprocessors
Designed for low power applications
Compatible with hybrid or PC board packaging
Low aging
Full military testing available
Ideal for battery operated applications
Designed and manufactured in the USA
PACKAGE HANDLING
The CX crystal is hermetically sealed in a ceramic package.
Normal handling and soldering precautions for small, low
thermal mass parts are adequate when installing or testing CX
crystals. CX crystals may be wave soldered, with proper
precaution taken to avoid desoldering the leads. A slow
machine rate or too high a pre-heat temperature or solder bath
temperature can damage the crystals. Lead to package
solder interface temperature should not exceed 175
o
C,
glass lid to package seal rim temperature should not
exceed 210
o
C. If the seal rim reaches temperatures above the
maximum specified, the package may lose its hermeticity. Loss
of hermeticity results in a frequency decrease and motional
resistance increase.
CX-2 CRYSTAL
760 kHz to 1.35 MHz
Miniature Quartz Crystal
10139 - Rev C
actual size
C
0
C
1
R
1
2
1
L
1
EQUIVALENT CIRCUIT
R
1
Motional Resistance L
1
Motional Inductance
C
1
Motional Capacitance C
0
Shunt Capacitance
Notes:
1.Terminal 1 is electrically connected
internally to terminal 3.
2.Lead dimensions
Width: .013" (.33mm) Typical
Thickness: .007" (.18mm) Typical
3.A = Glass Lid .080 (2.03) max.
Ceramic Lid .095 (2.41) max.
.260
(6.60)
.200
(5.08)
.260
(6.60)
.205
(5.21)
.050(1.27)
.260
(6.60)
.100
(2.54)
1
2
2
2
1
3
A
A
3
1
3
-04 Side Lead
-03 Side Lead
INCHES (mm)
-02 End Lead
.094
(2.39)
.210
(5.33)
.094
(2.39)
.094
(2.39)
.210
(5.33)
A
PACKAGE DIMENSIONS
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
TM
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
10139 - Rev C
SPECIFICATIONS
Specifications are typical at 25
O
C unless otherwise noted.
Specifications are subject to change without notice.
Frequency Range
760 kHz - 1.35 MHz
Functional Mode
Extensional
Calibration Tolerance*
A
0.05% ( 500ppm)
B
0.1%
C 1.0%
Load Capacitance
7 pF
Motional Resistance (R
1
)
5 k
MAX
Motional Capacitance (C
1
)
1.2fF
Quality Factor (Q)
150 k
Shunt Capacitance (C
0
)
1.0 pF
Drive Level
3 W MAX.
Turning Point (T
O
)**
35
O
C
Temperature Coefficient (k) -0.035 ppm/
O
C
2
Note: Frequency (f) deviation from frequency (f
O
) @ turning
point temperature (T
O
);
Aging, first year
5ppm MAX.
Shock
1000g peak, 0.3 msec.,1/2 sine
Vibration, survival
10g rms, 20-1,000 Hz random
Operating Temperature
-10
O
C to +70
O
C Commercial
-40
O
C to +85
O
C Industrial
-55
O
C to +125
O
C Military
Storage Temperature
-55
O
C to +125
O
C
Max Process Temperature
See package handling
* Tighter frequency calibration available.
** Other turning point available.
+
_
+
_
+
_
+
_
PACKAGING
CX-2-Leaded -Tray Pack (Standard)
f-f
O =
k(T-T
O
)
2
f
O
HOW TO ORDER CX-2-LEADED CRYSTALS
CX-2
-03
1.0 MHz
( A /
I
)
"S" if special
Leads
Frequency
Calibration
Temp. Range:
or custom
-02
Tolerance* C = Commercial
design.
-03
@ 25
0
C
I = Industrial
Blank if Std.
-04
(A)
M = Military
(B)
S = Specify
(C)
*Other calibration fill in ppm.
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
The low profile CX miniature leaded crystal is ideal for
small, high density, battery operated portable products.
The CX crystal designed in a Pierce oscillator (single
inverter) circuit provides very low current consumption
and high stability. A conventional CMOS Pierce oscillator
circuit is shown below. The crystal is effectively inductive
and in a PI-network circuit with C
D
and C
G
provides the
additional phase shift necessary to sustain oscillation.
The oscillation frequency (f
O
) is 15 to 150 ppm above
the crystal's series resonant frequency (f
s
).
Drive Level
R
A
is used to limit the crystal's drive level by forming a
voltage divider between R
A
and C
D
. R
A
also stabilizes
the oscillator against changes in the amplifiers output
resistance (R
0
). R
A
should be increased for higher
voltage operation.
Load Capacitance
The CX crystal calibration tolerance is influenced by the
effective circuit capacitances, specified as the load
capacitance (C
L
). C
L
is approximately equal to:
NOTE: C
D
and C
G
include stray layout to ground and C
s
is the stray shunt capacitance between the crystal
terminal. In practice, the effective value of C
L
will be less
than that calculated from C
D
, C
G
and C
S
values because
of the effect of the amplifier output resistance. C
S
should
be minimized.
The oscillation frequency (f
O
) is approximately equal to:
AMPLIFIER
BUFFER
C
G
C
D
R
A
CX-1
Contact factory for
design guidelines
OSC
Freq (f )
O
R
f
C
S
CX-2
f
O
=
f
S
[
1
+
C
1
]
2(C
0
+ C
L
)
(2)
Where f
S
= Series resonant frequency of the crystal
C
1
= Motional Capacitance
C
0
= Shunt Capacitance
C
L
=
C
D
x C
G
+
C
S
C
D
+ C
G
(1)
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