Data Sheet

3
ECS, INC. INTERNATIONAL 1105 S. RIDGEVIEW, OLATHE, KS 66062 • 913-782-7787 • 800-237-1041 • FAX [phone] • WWW.ECSXTAL.COM
CRYSTALS CRYSTALS
Ø
3.1 Max.
ø 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
• PbFree/RoHS Compliant
ECS-3X8X, 2X6X, 1X5X
32.768 KHz TUNING FORK
PACKAGE DIMENSIONS (mm)
OPERATING CONDITIONS/ELECTRICAL CHARACTERISTICS
PARAMETERS ECS-3X8X ECS-2X6X ECS-1X5X UNITS
NOMINAL FREQUENCY Fo 32.768 32.768 32.768 KHz
FREQUENCY TOLERANCE Δf/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 µW
RESISTANCE
AT SERIES RESONANCE
R
1
35 (max.) 35 (max.) 40 (max.) KΩ
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 ß -0.040ppm/˚C
2
max. -0.040ppm/˚C
2
max. -0.040ppm/˚C
2
max. PPM/(ΔC˚)
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 500MΩ min./DC100V MΩ
AGING (FIRST YEAR) Δf/fo ±3 PPM max. @ +25˚C ±3˚C PPM
MOTIONAL CAPACITANCE C
1
0.0035 (typ.) 0.0030 (typ.) 0.0025 (typ.) pF
PART NUMBERING GUIDE “EXAMPLE”
MANUFACTURER FREQUENCY LOAD CAPACITANCE PACKAGE TYPE*
ECS – .327 – 12.5 – 8X
ECS – .327 – 12.5 – 13X
ECS – .327 – 8 – 14X
Figure 1) ECS-3X8X
ø 2.1 Max
ø 0.26
0.7
6.2 Max.
6.1
Figure 2) ECS-2X6X
ø 1.5 Max
ø 0.2
0.45
5.1 Max. 4.3
Figure 3) ECS-1X5X
* Package type examples (8X=3x8, 13X=2x6, 14X=1x5)
Note: Contact factory for optional load capacitance.
RECOMMENDED OSCILLATION
CIRCUIT
ELECTRICAL CHARACTERISTICS
IC: TC 4069P
Rf: 10MΩ
Rd: 330KΩ (As required)
C
1
= 22pF, C
2
= 22pF
V
DD
= 3.0V
Rf
Rd
C
2
C
1
In this circuit, low drive level with a maximum of 1µW is rec-
ommended. If excessive drive is applied, irregular oscillation
or quartz element fractures may occur.
PARABOLIC TEMPERATURE CURVE
-20
-10
-20
-30
-40
-50
-60
-10 010 20304050 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 (
Δ
T)
2
= -0.04 PPM x (20)
2
= -16.0 PPM