参数资料
型号: OR4E062BM680-DB
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: FPGA
英文描述: FPGA, 2024 CLBS, 515000 GATES, PBGA680
封装: PLASTIC, FBGA-680
文件页数: 50/151页
文件大小: 2680K
代理商: OR4E062BM680-DB
Lattice Semiconductor
143
Data Sheet
September, 2002
ORCA Series 4 FPGAs
Θ
ΘJC
Thisisthethermalresistancefromjunctiontocase.Itismostoftenusedwhenattachingaheatsinktothetopof
thepackage.Itisdefinedby:
Theparametersinthisequationhavebeendefinedabove.However,themeasurementsareperformedwiththe
caseofthepartpressedagainstawater-cooledheatsinktodrawmostoftheheatgeneratedbythechipoutthe
topofthepackage.ItisthisdifferenceinthemeasurementprocessthatdifferentiatesΘJCfromψJC.ΘJCisatrue
thermalresistanceandisexpressedinunitsof°C/W.
Θ
ΘJB
Thisisthethermalresistancefromjunctiontoboard(ΘJL).Itisdefinedby:
whereTBisthetemperatureoftheboardadjacenttoaleadmeasuredwithathermocouple.Theotherparameters
ontheright-handsidehavebeendefinedabove.Thisisconsideredatruethermalresistance,andthemeasure-
mentismadewithawater-cooledheatsinkpressedagainsttheboardtodrawmostoftheheatoutoftheleads.
NotethatΘJBisexpressedinunitsof
°C/W,andthatthisparameterandthewayitismeasuredarestillinJEDECcommittee.
ΘJC
TJ
TC
Q
--------------------
=
ΘJB
TJ
TB
Q
--------------------
=
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