3
ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 913-782-7787 800-237-1041 FAX 913-782-6991 WWW.ECSXTAL.COM
CRYSTALS CRYSTALS
3.1
Max.
0.35
1.1
8.2 Max.
10
ECS tuning fork type crystals are used as a
clock source in communication equipment,
measuring instruments, microprocessors and
other time management applications. Their
low power consumption makes these crystals
ideal for portable equipment.
FEATURES
Cost effective
Tight tolerance
Long term stability
Excellent resistance and environmental characteristics
ECS-3X8, 2X6, 1X5
32.768 KHz TUNING FORK CRYSTALS
OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS
PACKAGE DIMENSIONS (mm)
PARAMETERS
ECS-3X8
ECS-2X6
ECS-1X5
UNITS
NOMINAL FREQUENCY
Fo
32.768
32.768
32.768
KHz
FREQUENCY TOLERANCE
f/fo
20
20
20
PPM
LOAD CAPACITANCE (typ.)
C
L
12.5
12.5
8.0
pF
DRIVE LEVEL (max.)
D
L
1
1
1
W
RESISTANCE
AT SERIES RESONANCE
R
1
35 (max.)
35 (max.)
40 (max.)
K
Q-FACTOR
Q
90,000 (typ.)
70,000 (typ.)
80,000 (typ.)
TURNOVER TEMPERATURE
T
M
+25 5
+25 5
+25 5
C
TEMPERATURE COEFFICIENT
-0.040ppm/C
2
max.
-0.040ppm/C
2
max.
-0.040ppm/C
2
max.
PPM/(
C)
SHUNT CAPACITANCE
C
o
1.60 (typ.)
1.35 (typ.)
1.00 (typ.)
pF
CAPACITANCE RATIO
460 (typ.)
450 (typ.)
400 (typ.)
OPERATING TEMP. RANGE
T
OPR
-10~+60
C
STORAGE TEMP. RANGE
T
STG
-40~+85
C
SHOCK RESISTANCE
Drop test 3 times on hard wooden board from height of 75cm / 5 PPM max.
PPM
INSULATION RESISTANCE
IR
500M
min./DC100V
M
AGING (FIRST YEAR)
f/fo
3 PPM max. @ +25C 3C
PPM
MOTIONAL CAPACITANCE
C
1
0.0035 (typ.)
0.0030 (typ.)
0.0025 (typ.)
pF
PART NUMBERING GUIDE
"EXAMPLE"
FREQUENCY
LOAD CAPACITANCE
PACKAGE TYPE*
ECS
.327
12.5
8
ECS
.327
12.5
13
ECS
.327
8
14
Figure 1) ECS-3X8
2.1 Max
0.26
0.7
6.2 Max.
10
Figure 2) ECS-2X6
1.5 Max
0.2
0.45
5.1 Max.
4.3
Figure 3) ECS-1X5
* Package type examples (8=3x8, 13=2x6, 14=1x5)
Note: Contact factory for optional load capacitance.
Rf
Rd
C
2
C
1
ELECTRICAL CHARACTERISTICS
IC: TC 4069P
Rf: 10M
Rd: 330K
(As required)
C
1
= 22pF, C
2
= 22pF
V
DD
= 3.0V
RECOMMENDED OSCILLATION
CIRCUIT
PARABOLIC TEMPERATURE CURVE
In this circuit, low drive level with a maximum of
1W is recommended. If excessive drive is
applied, irregular oscillation or quartz element
fractures may occur.
-20
-10
-20
-30
-40
-50
-60
-10
0
10
20
30
40 50
60
70
f/f (PPM)
T (C)
To determine frequency stability, use parabolic
curvature. For example: What is the stability at 45C?
1) Change in T (C) = 45 -25 = 20C
2) Change in frequency = -0.04 PPM x (
T)
2
= -0.04 PPM x (20)
2
= -16.0 PPM
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