CX-2-SM CRYSTAL
760 kHz to 1.35 MHz
TM
Low Profile Miniature
Surface Mount Quartz Crystal
DESCRIPTION
actual size
The CX-2-SM quartz crystals are leadless devices designed
for surface mounting on printed circuit boards or hybrid
substrates. They are hermetically sealed in a rugged,
miniature ceramic package. They are manufactured using
the STATEK-developed photolithographic process, and
were designed utilizing the experience acquired by
producing millions of crystals for industrial, commercial,
military and medical applications. Maximum process
temperature should not exceed 260
O
C.
FEATURES
side view
PACKAGE DIMENSIONS
B
1
Extensional mode
Ideal for use with microprocessors
Designed for low power applications
Compatible with hybrid or PC board
Low aging
Full military testing available
Ideal for battery operated applications
Designed and manufactured in the USA
EQUIVALENT CIRCUIT
C
D
E
3
F
2
I
G
H
A
TYP.
DIM
A
B
INCHES
.260
.094
-
.035
.059
.050
.105
.155
.210
mm
6.60
2.39
-
0.89
1.50
1.27
2.67
3.94
5.33
.275
.108
.045
.069
.060
.115
.165
.220
MAX.
INCHES
mm
6.99
2.74
1.14
1.75
1.52
2.92
4.19
5.59
C
0
1
L
1
C
1
R
1
2
C
D
E
F
G
H
I
see below
R
1
Motional Resistance L
1
Motional Inductance
C
1
Motional Capacitance C
0
Shunt Capacitance
SUGGESTED LAND PATTERN
DIM “C”
.105[2.67]
GLASS LID
INCHES
.065
.067
.070
mm
1.65
1.70
1.78
CERAMIC LID
INCHES
.075
.077
.080
mm
1.91
1.96
2.03
MAX
SM1
SM2
SM3
.113
[2.87]
. 060[1.52]
INCHES (mm)
GRID
COURTYARD
1
2
.060[1.52]
Note: Terminal 1 is electrically connected internally to terminal 3
10135 - Rev A
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
SPECIFICATIONS
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
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
+
_
0.05% (
+
500ppm)
_
Calibration Tolerance*
A
+
_
0.1%
B
+
_
1.0%
C
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
f-f
O =
k(T-T )
2
point temperature (T
O
);
O
f
O
Aging, first year
Shock
Vibration, survival
Operating Temperature
5ppm MAX.
1000g peak, 0.3 msec.,1/2 sine
10g rms, 20-1,000 Hz random
-10
O
C to +70
O
C Commercial
-40
O
C to +85
O
C Industrial
-55
O
C to +125
O
C Military
-55
O
C to +125
O
C
260
O
C for 20 sec.
The low profile CX miniature surface mount 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:
C
L =
C
D
x C
G
C
D
+ C
G
+
C
S
(1)
Storage Temperature
Max Process Temperature
* Tighter frequency calibration available.
** Other turning point available.
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:
f
O =
f
S
1
+
Where f
S
C
1
C
0
[
C
1
2(C
0
+ C
L
)
]
(2)
TERMINATIONS
Designation
SM1
SM2
SM3
Termination
Gold Plated
Nickel, Solder Plated
Nickel, Solder Plated and Solder Dipped
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
PACKAGING
R
f
BUFFER
OSC
Freq (f
O
)
Contact factory for
design guidelines
CX-2-SM - Tray Pack (Standard)
-16mm tape, 7” or 13” reels (Optional)
Per EIA 481 (see data sheet 10109)
AMPLIFIER
C
S
R
A
HOW TO ORDER CX-2-SM CRYSTALS
CX-2
“S” if special
or custom
design.
Blank if Std.
-SM1
SM1
SM2
SM3
Blank = Glass Lid
C=Ceramic Lid
1.0 MHz
(
A
/
I
)
Calibration
Tolerance*
@ 25
0
C
Frequency (A)
(B)
(C)
Temp. Range:
C = Commercial
I = Industrial
M = Military
S = Specify
C
G
CX-1
CX-2
C
D
*Other calibration fill in ppm.
10135 - Rev A
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
Industrial Control Electronics
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