CX4VSM CRYSTAL
30 kHz to 250 kHz
Ultra-Miniature Low Profile
Surface Mount Quartz Crystal
DESCRIPTION
STATEK’s ultra-miniature CX4VSM quartz crystals are
hermetically sealed in surface mount ceramic packages and
custom laser-tuned to frequencies ranging from 30 kHz to
250 kHz. This high quality tuning fork resonator is intended
for use in Pierce (single inverter) oscillators with a maximum
process temperature not to exceed 260
O
C.
FEATURES
Glass Lid Shown
PACKAGE DIMENSIONS
D
Ultra-miniature, surface mount design
Available with glass or ceramic lid
Hermetically sealed ceramic package
Quartz crystal tuning fork design
High shock and vibration survival
Excellent aging characteristics
Designed for low power applications
Full military testing available
Designed and manufactured in the USA
APPLICATIONS
B
C
D
E
A
TOP
F
BOTTOM
TYP.
DIM
A
B
C
D
E
F
inches
0.197
0.072
-
0.036
0.020
0.025
mm
5.00
1.83
-
0.91
0.51
0.64
inches
0.210
0.085
0.046
-
-
MAX.
mm
5.33
2.16
1.16
-
-
Medical Implantable and Non-Implantable Devices
Military Devices
Smart Card
Transponder / Animal Migration
Space Limited Devices
Handheld Battery Operated Devices
Down Hole / Industrial Instrumentation
Computer / Computer Peripherals
see below
THICKNESS (DIM C)
Lid
Ceramic
Termination
inches
SM1
SM2/SM4
SM3/SM5
SM1
SM2/SM4
SM3/SM5
0.050
0.051
0.053
0.045
0.046
0.048
Maximum
mm
1.27
1.30
1.35
1.14
1.17
1.22
SUGGESTED LAND PATTERN
EQUIVALENT CIRCUIT
0.059 (1.5)
C
0
1
L
1
C
1
R
1
2
0.092 (2.3)
R
1
Motional Resistance L
1
Motional Inductance
C
1
Motional Capacitance C
0
Shunt Capacitance
Glass
0.160 (4.0)
inches (mm)
10103 - Rev E
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.
Parameters
Fundamental
Overtone
Frequency, (kHz)
Motional Resistance R
1
(kΩ)
Motional Capacitance C
1
(fF)
Quality Factor Q (k)
Shunt Capacitance C
0
(pF)
Load Capacitance (pF)
1
Turning Point (
o
C)
1
32.768
50
2.3
40
1.1
9
25
100
18
1.07
85
0.7
8
10
200
2.4
2.2
140
1.2
5
29
The CX4 family of surface mount crystals are ideal for
small, high density, battery operated portable products. The
CX4 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
0
) is 50 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 CX4 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
Standard Calibration Tolerance for 32.768 kHz
2
Glass Lid:
Ceramic Lid:
Drive Level
30 ppm
(0.003%)
+
_
+
_
+
_
100 ppm
(0.01%)
1000 ppm
(0.1%)
+
_
1000 ppm
(0.1%)
10000 ppm
(1.0%)
100 ppm
(0.01%)
+
_
+
_
0.5
µW
MAX
Temperature Coefficient (k) -0.035 ppm/
O
C
2
Note: Frequency f at temperature T is related to frequency f
0
at
turning point temperature T
0
by: f-f
0
2
=
k(T-T
0
)
f
0
Aging, first year
3 ppm
Shock, survival
3
Vibration, survival
Operating Temp. Range
5,000 g, 0.3 ms, 1/2 sine
20 g RMS, 10-2,000 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 C to +125 C
O
O
(1)
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
0
) is approximately equal to:
f
0
=
f
S
1
+
Where f
S
C
1
C
0
Storage Temp. Range
Max Process Temperature
1. Other values available
2. Tighter tolerances available
[
C
1
2(C
0
+ C
L
)
]
(2)
260
O
C for 20 sec.
3. Higher shock available
TERMINATIONS
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
Designation
SM1
SM2
SM3
SM4
SM5
CX4VSM
Termination
Gold Plated
Solder Plated
Solder Dipped
Solder Plated (Pb Free)
Solder Dipped (Pb Free)
- Tray Pack
- 16mm tape, 7” or 13” reels
(Reference tape and reel data sheet 10109)
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
R
f
BUFFER
OSC
Freq (f
O
)
PACKAGING OPTIONS
AMPLIFIER
R
A
HOW TO ORDER CX4VSM CRYSTALS
CX4V
S
C
C = Ceramic Lid
Blank = Glass Lid
“S” if special or
custom design.
Blank if standard
SM1
32.768K , 100
Frequency
K = kHz
Calibration
Tolerance
@25
O
C
(in ppm)
/
I
SM1 = Gold Plated (Pb Free)
SM2 = Solder Plated
SM3 = Solder Dipped
SM4 = Solder Plated (Pb Free)
SM5 = Solder Dipped (Pb Free)
Operating Temp. Range:
C = -10
O
C to +70
O
C
I
= -40
O
C to +85
O
C
M = -55
O
C to +125
O
C
S = Customer Specified
C
G
CX4
XTAL
C
D
10103 - Rev E
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256
www.statek.com
FPGA/CPLD
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