Datenblatt

CX6SM CRYSTAL
800 kHz to 1.35 MHz
Ultra-Low Profile (1mm)
Miniature Surface Mount Quartz Crystal
DESCRIPTION
actual size
The CX6SM 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 are
designed utilizing the experience acquired by producing
millions of crystals for industrial, commercial, military and
medical applications. Maximum process temperature should
not exceed 260OC.
side view
Glass Lid Shown
PACKAGE DIMENSIONS
D
FEATURES
Ultra-low profile (1mm)
Extensional mode
TOP
A
BOTTOM
Ideal for use with microprocessors
Designed for low power applications
Low aging
D
Full military testing available
C
B
Ideal for battery operated applications
Designed and manufactured in the USA
TYP.
EQUIVALENT CIRCUIT
C0
1
L1
C1
R1
2
DIM
inches
mm
inches
mm
A
0.265
6.73
0.280
7.11
B
0.103
2.62
0.114
2.90
C
-
-
D
0.050
1.27
DIM “C“
R1 Motional Resistance L1 Motional Inductance
C1 Motional Capacitance C0 Shunt Capacitance
SUGGESTED LAND PATTERN
MAX.
GLASS LID
see below
0.060
1.52
CERAMIC LID
MAX
inches
mm
inches
mm
SM1
0.039
0.99
0.053
1.35
SM2/SM4
0.041
1.04
0.055
1.40
SM3/SM5
0.044
1.12
0.058
1.47
0.070 (1.78)
0.120 (3.05)
inches (mm)
0.215 (5.46)
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
10133 - Rev C
TYPICAL APPLICATION
FOR A PIERCE OSCILLATOR
SPECIFICATIONS
Specifications are typical at 25OC unless otherwise noted.
Specifications are subject to change without notice.
Frequency Range
800 kHz - 1.35 MHz
Functional Mode
Calibration Tolerance1
Extensional
+
_ 500 ppm (0.05%)
+
_ 1000 ppm (0.1%)
+
_ 10000 ppm (1.0%)
Load Capacitance
7 pF (Unless specified by customer)
Motional Resistance (R1)
5 kΩ MAX
Motional Capacitance (C1) 1.2fF
Quality Factor (Q)
150 k
Shunt Capacitance (C0)
1.0 pF
Drive Level
3 µW MAX
Turning Point (T0)2
35OC
Temperature Coefficient (k) -0.035 ppm/OC2
Aging, first year
5 ppm MAX
Shock, survival
1,000 g, 0.3 ms,1/2 sine
Vibration, survival
10 g RMS, 20-1,000 Hz random
Operating Temp. Range
-10OC to +70OC (Commercial)
-40OC to +85OC (Industrial)
-55OC to +125OC (Military)
Storage Temp. Range
-55OC to +125OC
Max Process Temperature 260OC for 20 sec.
Note: Frequency f at temperature T is related to frequency f0
at turning point temperature T0 by: f-f0
2
= k(T-T0)
f
0
1. Tighter tolerances available.
2. Other values available.
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 CD and CG provides the additional
phase shift necessary to sustain oscillation. The oscillation
frequency (f0) is 15 to 150 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 =
[
f0 = fS 1 +
- Tape and Reel
(Reference tape and reel data sheet 10109)
TERMINATIONS
Termination
Gold Plated
Solder Plated
Solder Dipped
Solder Plated (Lead Free)
Solder Dipped (Lead Free)
Where f
S
C1
C0
C1
2(C0 + CL)
S
C
Blank = Glass Lid
C = Ceramic Lid
“S” if special or
custom design.
Blank if Srd.
SM1
1.0M
Frequency
K = kHz
M=MHz
,
500
Calibration
Tolerance
@ 25OC
(in ppm)
SM1 = Gold Plated
SM2 = Solder Plated
SM3 = Solder Dipped
SM4 = Solder Plated (Lead Free)
SM5 = Solder Dipped (Lead Free)
]
(2)
= Series resonant frequency of the crystal
= Motional Capacitance
= Shunt Capacitance
CONVENTIONAL CMOS
PIERCE OSCILLATOR CIRCUIT
Rf
BUFFER
HOW TO ORDER CX6SM CRYSTALS
CX6
(1)
+ CS
The oscillation frequency (f0) is approximately equal to:
- Tray Pack
Designation
SM1
SM2
SM3
SM4
SM5
CD + CG
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.
PACKAGING
CX6SM
CD x CG
/
I
Operating Temp. Range:
C = -10OC to +70OC
I = -40OC to +85OC
M = -55OC to +125OC
S = Customer Specified
AMPLIFIER
CG
CX6
RA
OSC
Freq (fO )
CD
STATEK CORPORATION 512 N. MAIN ST., ORANGE, CA 92868 714-639-7810 FAX: 714-997-1256 www.statek.com
10133 - Rev C
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