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packagethermalresistanceforrgz(qfn)包装
(1)(2)
packagethermalresistanceforzva(bga)包装
(1)
RECOMMENDEDOPERATINGCONDITIONS
TIMINGREQUIREMENTS
CDCM7005
SCAS793A–JUNE2005–REVISEDJUNE2005
airflow(lfm)
θ
JA
(
°
c/w)
θ
JC
(
°
c/w)
θ
JP
(
°
c/w)
(3)
ψ
JT
(
°
c/w)
029.922.41.50.2
15024.70.2
25023.20.2
50021.50.3
(1)thepackagethermalimpedanceiscalculatedinaccordancewithjesd51andjedec2s2p(高-kboard).
(2)connectedtogndwithninethermalvias(0,3mmdiameter).
(3)
θ
JP
(junctionpad)isusedfortheqfnpackage,becausethemainheatflowisfromthejunctiontothegndpadoftheqfn.
airflow(m/s)
θ
JA
(
°
c/w)
θ
JC
(
°
c/w)
θ
JB
(
°
c/w)
(2)
ψ
JT
(
°
c/w)
0m/s53.928.338.60.7
1m/s49.80.7
2m/s48.50.8
(1)thepackagethermalimpedanceiscalculatedinaccordancewithjesd51andjedec2s2p(高-kboard).
(2)
θ
JB
(junctionboard)isusedforthebgapackage,becausethemainheatflowisfromjunctiontotheboard.
MINNOMMAXUNIT
V
CC
,av
CC
33.33.6
SupplyvoltageV
V
cc_cp
2.3v
CC
V
IL
低-levelinputvoltagelvcmos,看
(1)
0.3v
CC
V
V
IH
高-levelinputvoltagelvcmos,看
(1)
0.7v
CC
V
I
OH
高-leveloutputcurrentlvcmos(includesallstatuspins)–8ma
I
OL
低-leveloutputcurrentlvcmos(includesallstatuspins)8ma
V
I
inputvoltagerangelvcmos03.6v
V
IL
低-levelinputvoltagelvpeclv
CC
–1.81v
CC
–1.475v
V
IH
高-levelinputvoltagelvpeclv
CC
–1.26v
CC
–0.88v
V
INPP
inputamplitudelvpecl(v
vcxo_在
–V
vcxo_在
)
(2)
0.51.3v
V
IC
一般-modeinputvoltagelvpecl1v
CC
–0.3v
T
一个
operatingfree-airtemperature–4085
°
C
(1)v
IL
andV
IH
arerequiredtomaintainacspecifications;theactualdevicefunctiontoleratesasmallerinputlevelof1v,ifanac-couplingto
V
CC
/2isprovided.
(2)v
INPP
minimumandmaximumisrequiredtomaintainacspecifications;theactualdevicefunctiontoleratesataminimumv
INPP
of150mv.
overrecommendedrangesofsupplyvoltage,loadandoperatingfreeairtemperature
PARAMETERMINTYPMAXUNIT
pri_ref/秒_ref_inrequirements
f
ref_在
LVCMOSprimaryorsecondaryreferenceclockfrequency
(1)(2)
0200MHz
t
r
/t
f
riseandfalltimeofpri_reforsec_refsignalsfrom20%to80%ofv
CC
4ns
dutyrefdutycycleofpri_reforsec_refatv
CC
/240%60%
vcxo_在,vcxo_inrequirements
f
vcxo_在
VCXOclockfrequency
(3)
02200MHz
(1)在
ReferenceClock
lessthan2mhz,thedevicestaysinnormaloperationmodebutthefrequencydetectioncircuitryresetsthe
状态_refsignaltolow.inthiscase,thestatusofthestatus_refisnolongerrelevant.
(2)f
ref_在
canbeupto250mhzintypicaloperatingmode(25
°
c/3.3-vv
CC
).
(3)ifthe
FeedbackClock
(derivesfromvcxoinput)islessthan2mhz,thedevicestaysinnormaloperationmodebutthefrequency
detectioncircuitryresetsthestatus_vcxosignalandpll_locksignaltolow.bothstatussignalsarenolongerrelevant.这个
effectsthehold-overfunctionaswell,asthepll_locksignalisnolongervalid!
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