參數(shù)資料
型號(hào)： QT78R-10-FREQ1
廠商： Q-TECH CORP
元件分類： XO, clock
英文描述： CRYSTAL OSCILLATOR, CLOCK, 0.125 MHz - 15 MHz, LVHCMOS OUTPUT
封裝： ROHS COMPLIANT, HERMETIC SEALED, MINIATURE, CERAMIC, J-LEAD, SMD, 4 PIN
文件頁(yè)數(shù)： 5/6頁(yè)
文件大?。?/td> 248K
代理商： QT78R-10-FREQ1
55
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
Q-TECH
CORPORATION
QT78 SERIES
HIGH-RELIABILITY MINIATURE CLOCK OSCILLATORS
1.8 to 5.0Vdc
-
15kHz to 150MHz
QT78 (RevisionC,July2008)(ECO#9380)
Vdd
GND
0.1xVdd
0.9xVdd
VOH
VOL
Tr
Tf
TH
T
0.5xVdd
SYMMETRY =
x 100%
TH
T
OutputWaveform(Typical)
Frequencyvs.TemperatureCurve
TestCircuit
-
Output
Ground
4
3
2
0.1F
15pF
1
Tristate Function
Power
supply
10k
mA
Vdc
+
(*)
or
0.01F
QT78
(*) CL includes probe and jig capacitance
Typical test circuit for CMOS logic
Frequency-Temperature Curves QT78RD-70MHz 1.8Vdc
-40
-30
-20
-10
10
20
30
40
-55 -50 -45 -40 -35 -30 -25 -20 -15 -10
-5
05
10
15
20
25
30
35
Temp (C)
P
M
40
45
50
55
60
65
70
75
80
85
90
95
100 105 110 115 120 125
0
45
Hybrid Case
Substrate
Die
D/A epoxy
Heat
Die
R1
D/A epoxy
Substrate
D/A epoxy
Hybrid Case
R2
R3
R4
R5
ThermalCharacteristics
JA
JC
CA
Die
T
C
A
J
CA
JC
(Figure1)
(Figure2)
TheTristatefunctiononpin1hasabuilt-inpull-upresistortypical50k,soit
canbeleftfloatingortiedtoVddwithoutdeterioratingtheelectricalperformance.
Theheattransfermodelinahybridpackageisdescribedin
figure1.
Heatspreadingoccurswhenheatflowsintoamateriallayerof
increasedcross-sectionalarea. Itisadequatetoassumethat
spreadingoccursata45°angle.
Thetotalthermalresistanceiscalculatedbysummingthe
thermalresistancesofeachmaterialinthethermalpath
betweenthedeviceandhybridcase.
RT=R1+R2+R3+R4+R5
ThetotalthermalresistanceRT(seefigure2)betweentheheat
source(die)tothehybridcaseistheThetaJunctiontoCase
(ThetaJC)in°C/W.
Thetajunctiontocase(ThetaJC)forthisproductis30°C/W.
Thetacasetoambient(ThetaCA)forthispartis100°C/W.
ThetaJunctiontoambient(ThetaJA)is130°C/W.
MaximumpowerdissipationPDforthispackageat25°Cis:
PD(max)=(TJ(max)–TA)/ThetaJA
WithTJ=175°C(Maximumjunctiontemperatureofdie)
PD(max)=(175–25)/130=1.15W
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