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ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX 913-782-6991 • WWW.ECSXTAL.COM
SMD CRYSTALS SMD CRYSTALS
1.3 1.3
4.2
1.9 1.3 1.9
FEATURES
•
Low profile
•
Long term stability
•
Industry standard footprint
• Excellent shock resistance
• Excellent environmental
characteristics
• Tape and Reel (3,000 pcs)
• PbFree/RoHS Compliant
ECX-306X/306IX SMD TUNING FORK CRYSTAL
PACKAGE DIMENSIONS (mm)
Figure 1) ECX-306 - Top, Side and End views
with pin connections
Figure 3) ECX-306/306I Land Pattern - Top view
Housing for the ECX-306X/306IX crystal
is made from the same thermoplastic
that is industry standard for integrated
circuits. This ruggedized molded pack-
age is excellent for SMD applications.
OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS
PARAMETERS ECX-306/306
I
UNITS
NOMINAL FREQUENCY Fo 32.768 KHz
LOAD CAPACITANCE CL 12.5 Standard (6.0 Optional) pF
DRIVE LEVEL DL 1 max. µW
CALIBRATION TOLERANCE @ 25˚C ±20 PPM
EQUIVALENT SERIES RESISTANCE R1 50 max. KΩ
TEMPERATURE COEFFICIENT -0.040 PPM/˚C2 max. PPM/(ΔC˚)
OPERATING TEMPERATURE RANGE TOPR -10 ~ +60 ˚C
MAX. OPERATING TEMPERATURE RANGE
-40 ~ +85 °C
Q FACTOR Q 50,000 min.
TURNOVER TEMPERATURE TO +25 ± 5 °C
STORAGE TEMPERATURE RANGE TSTG -55 ~ +125 °C
INSULATION RESISTANCE IR 500MΩ min./ DC 100V MΩ
SHUNT CAPACITANCE Co 1.35 typical pF
MOTIONAL CAPACITANCE C1 0.003 pF typical pF
AGING (FIRST YEAR) Δf/fo ±3 PPM max. @ +25˚C PPM
PART NUMBERING GUIDE
“EXAMPLE”
MANUFACTURER FREQUENCY LOAD CAPACITANCE PACKAGE TYPE**
ECS – .327 – 12.5 – 17X
3.8 Max.2.5 Max.
#4
#1
(0.9 Typical)
0.5 0.5
#3
#2
8.0 Max.
5.5
#3
#2
#4
#1
Figure 2) ECX-306I - Top, Side and End views
with pin connections
3.7 Max.
2.5 Max.
#4
#1
0.5 0.5 1.15
#3
#2
8.7 Max.
5.5
#3
#2
#4
#1
PARABOLIC TEMPERATURE CURVE
-20
-10
-20
-30
-40
-50
-60
-10 01020304050 60 70
f/f (PPM)
T (˚C)
To determine frequency stability, use parabolic
curvature. For example:
What is the stability at 45˚C?
1) Change in T (˚C) = 45 -25 = 20˚C
2) Change in frequency = -0.04 PPM x (ΔT) 2
= -0.04 PPM x (20) 2
= -16.0 PPM
** Package Type examples (-17X= ECX-306,X 17IX= ECX-306IX)
RECOMMENDED OSCILLATION CIRCUIT
ELECTRICAL CHARACTERISTICS
IC: TC 4069P
Rf: 10MΩ
Rd: 330KΩ (As required)
C1 = 22pF, C2 = 22pF
VDD = 3.0V
Rf
Rd
C
2
C
1
In this circuit, low drive level with a maximum
of 1µW is recommended. If excessive drive is
applied, irregular oscillation or quartz element
fractures may occur.
