CFS-308, CFS-206, CFS-145
FEATURES:
z
Because of their excellent shock resistance and low power
consumption, the units are ideal for portable equipment.
z
Features superior characteristics indigenous to tuning fork-type quartz
crystal units.
APPLICATIONS:
z
Used as a clock source for communication equipment, AV equipment,
OA equipment, measuring instruments and various types of clocks
STANDARD SPECIFICATIONS
Item CFS-308 CFS-206 CFS-145 Conditions
Nominal frequency
f
0
32.768KHz
Frequency tolerance
delta
f/f
0
±20ppm
(25°C)
Reference temperature
Frequency
vs.Temperature
Characteristics
delta
f/f
0
See drawing -10°C to +60°C
Turnover Temperature Tm 25°C ± 5°C
Temperature
coefficient
beta -0.034 ± 0.006ppm/°C
2
Operating temperature
range
T
opr
-10°C to +60°C
Storage temperature
range
T
stg
-40°C to +85°C
Quality factor Q 90,000 TYP. 70,000 TYP 80,000 TYP.
Equivalent series
resistance
R
1
35K ohm MAX.
40K ohm
MAX.
Reference temperature
(25°C)
Load capacitance
C
L
12.5pF TYP. 8.0pF TYP. Please specify
Motional capacitance
C
1
0.0035pF TYP.
0.0030pF
TYP.
0.0025pF
TYP.
Shunt capacitance
C
0
1.60pF TYP 1.35pF TYP. 1.00pF TYP.
Capacitance ratio gamma 460 TYP. 450 TYP. 400 TYP.
Drive level
DL
1 µ W MAX.
Insulation resistane
IR
500M ohm MIN. DC100V ± 15V
Aging (First year)
delta
f/f
0
± 3ppm MAX. 25°C ± 3° C
Hermeticity of seal
1 x 10-2 µ Pa·m3 /s MAX.
Shock resistance
± 5ppm MAX.
Drop test of 3 times on a board from 75cm height or shock test of 3000G x 0.3ms x
1/2sin wave x 3 directions
FREQUENCY vs TEMPERATURE CURVE
Pa
e 1 of 2Citizen Cr
stals and Oscillators - CFS
4/2/2003htt
://www.citizencr
stal.com/
uartz/cr
stals/cfs
d.htm
