Data Sheet - Statek Corporation

CX1SM CRYSTAL
530 kHz to 2.1 MHz
Low Profile, Miniature Surface Mount Quartz Crystal
DESCRIPTION
The CX1SM 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. The CX1SM 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.
Maximum process temperature should not exceed 260OC.
FEATURES
Actual size
Side view
Glass Lid Shown
PACKAGE DIMENSIONS
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
EQUIVALENT CIRCUIT
TYP.
DIM
inches
mm
inches
mm
A
0.315
8.00
0.330
8.38
B
0.140
3.56
0.155
3.94
C
-
-
D
0.045
1.14
0.055
1.40
E
0.060
1.52
0.070
1.78
DIM “C”
SUGGESTED LAND PATTERN
MAX.
GLASS LID
see below
CERAMIC LID
MAX
inches
mm
inches
mm
SM1
0.065
1.65
0.070
1.78
SM2/SM4
0.067
1.70
0.072
1.83
SM3/SM5
0.070
1.78
0.075
1.90
10129 - Rev C
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
SPECIFICATIONS
Specifications are typical at 25OC unless otherwise noted.
Specifications are subject to change without notice.
Parameters
Fundamental
Overtone
Frequency Range, (Hz)
555 k 614 k 1.0 M 1.4 M 1.8432 M 2.1M
Motional Resistance,R1(Ω)
600
275
500
300
475
Motional Capacitance,C1 (fF)
2.5
3.6
2.0
1.5
2.8
2.6
Quality Factor, Q (k)
170
260
190
100
110
70
1.2
1.3
1.1
1.0
1.3
1.3
Motional Resistance,R1 MAX
3 kΩ
Shunt Capacitance,C0 (pF)
Calibration Tolerance
1
775
+
_
500 ppm (0.05%)
+
_
1000 ppm (0.1%)
+
_
10000 ppm (1.0%)
3 µW MAX
Drive Level
7 pF
Load Capacitance2
Turning Point (T0)2
35OC
Temperature Coefficient (k) -0.035 ppm/OC2
Note: Frequency f at temperature T is related to frequency f0
f-f0 = k(T-T )2
at turning point temperature T0 by:
0
f0
Function Mode
Aging, first year
Shock, survival
Vibration, survival
Operating Temp. Range
Storage Temp. Range
Max Process Temperature
Extensional
5 ppm MAX
750 g, 0.3 ms, 1/2 sine
10 g RMS, 20-1,000 Hz random
-10OC to +70OC (Commercial)
-40OC to +85OC (Industrial)
-55OC to +125OC (Military)
-55OC to +125OC
260OC 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 PInetwork circuit with CD and CG provides the additional phase
shift necessary to sustain oscillation. The oscillation frequency
(f0) is 15 to 250 ppm above the crystal’s series resonant
frequency (fS).
Drive Level
RA is used to limit the crystal’s drive level by forming a
voltage divider between RA and CD. RA also stabilizes the
oscillator against changes in the amplifiers output resistance
(R0). RA 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 (CL). CL is approximately equal to:
CL =
CD x CG
CD + CG
(1)
+ CS
NOTE: CD and CG include stray layout to ground and CS is
the stray shunt capacitance between the crystal terminal. In
practice, the effective value of CL will be less than that
calculated from CD, CG and CS values because of the effect
of the amplifier output resistance. CS should be minimized.
The oscillation frequency (f0) is approximately equal to:
[
f0 = fS 1 +
C1
2(C0 + CL)
]
(2)
1. Tighter tolerances available.
2. Other values available.
TERMINATIONS
Designation
SM1
SM2
SM3
SM4
SM5
Where f
S
C1
C0
Termination
Gold Plated (Lead Free)
Solder Plated
Solder Dipped
Solder Plated (Lead Free)
Solder Dipped (Lead Free)
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
PACKAGING OPTIONS
CX1SM
- Tray Pack
- Tape and Reel
(Reference tape and reel data sheet 10109)
HOW TO ORDER CX1SM CRYSTALS
CX1
S
C
Blank = Glass Lid
C = Ceramic Lid
“S” if special or
custom design.
Blank if Std.
SM1
1.0M,
500 /
Frequency
K = kHz
M = MHz
SM1 = Gold Plated (Lead Free)
SM2 = Solder Plated
SM3 = Solder Dipped
SM4 = Solder Plated (Lead Free)
SM5 = Solder Dipped (Lead Free)
Calibration
Tolerance
@ 25OC
(in ppm)
I
Operating Temp. Range:
C = -10OC to +70OC
I = -40OC to +85OC
M = -55OC to +125OC
S = Customer Specified
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
10129 - Rev C