参数资料
型号: FXO-LC335R-0.75
厂商: FOX ELECTRONICS
元件分类: XO, clock
英文描述: CRYSTAL OSCILLATOR, CLOCK, 0.75 MHz, LVDS OUTPUT
封装: ROHS COMPLIANT, HERMETIC SEALED, CERAMIC PACKAGE-6
文件页数: 7/16页
文件大小: 589K
代理商: FXO-LC335R-0.75
FXO-LC33 Series
Page 15 of 16
2009 FOX ELECTRONICS | ISO9001:2000 Certified
Products are grouped together by process for MTTF calculations.
(All XpressO output and package types are manufactured with the same process)
Number of Parts Tested:
360 (120 of each output type: HCMOS, LVDS, LVPECL)
Number of Failures: 0
Test Temperature:
125°C
Number of Hours:
2000
MTTF was calculated using the following formulas:
[1.] Device Hours (devhrs) = (number of devices) x (hours at elevated temperature in °K)
[2.]
2
χ
×
=
af
devhrs
MTTF
[3.] FITS =
MTTF
1
* 10
9
Where:
Label
Name
Formula/Value
af
Acceleration Factor
e
t
k
eV
)
1
(
)
(
2
1
×
eV
Activation Energy
0.40 V
k
Bolzman’s Constant
8.62 X 10
-5 eV/°K
t1
Operating Temperature (°K)
t2
Accelerated Temperature (°K)
Θ
Theta
Confidence Level (60% industry standard)
r
Failures
Number of failed devices
χ
2
Chi-Square
statistical significance for bivariate tabular analysis [table look-
up] based on assumed
Θ (Theta – confidence) and number of
failures (r)
For zero failures (60% Confidence):
χ
2 = 1.830
DEVICE-HOURS = 360 x 2000 HOURS = 720,000
ACCELERATION FACTOR =
e
)
398
1
298
1
(
)
625
.
8
40
.
0
(
×
= 49.91009
MTTF =
833
.
1
2
91009
.
49
000
,
720
×
= 39,209,238 Hours
Failure Rate =
2
91009
.
49
000
,
720
833
.
1
×
= 2.55E-8
FITS = Failure Rate *1E9 = 26
MTTF / FITS Calculations
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