Datasheet

V
CC
Time
t
GW
t
GH
V
CC
V
POR
V
PORF
Time
POR
Time
TCA6408A
www.ti.com .............................................................................................................................................................SCPS192C–APRIL2009–REVISEDJULY2009
Glitchesinthepowersupplycanalsoaffectthepower-onresetperformanceofthisdevice.Theglitchwidth(t
GW
)
andheight(t
GH
)aredependentoneachother.Thebypasscapacitance,sourceimpedance,anddevice
impedancearefactorsthataffectpower-onresetperformance.Figure19andTable2providemoreinformation
onhowtomeasurethesespecifications.
Figure19.GlitchWidthandGlitchHeight
V
POR
iscriticaltothepower-onreset.V
POR
isthevoltagelevelatwhichtheresetconditionisreleasedandallthe
registersandtheI
2
C/SMBusstatemachineareinitializedtotheirdefaultstates.ThevalueofV
POR
differsbased
ontheV
CC
beingloweredtoorfrom0.Figure20andTable2providemoredetailsonthisspecification.
Figure20.V
POR
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