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ElectricalCharacteristics
(1)
SwitchingCharacteristics
SN74CB3T3245
8-bitfetbusswitch
2.5-v/3.3-vlow-voltagewith5-v-tolerantlevelshifter
SCDS136–OCTOBER2003–REVISEDMARCH2005
overrecommendedoperatingfree-airtemperaturerange(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYP
(2)
MAXUNIT
V
IK
V
CC
=3v,i
I
=–18ma–1.2v
V
OH
SeeFigure3andFigure4
I
在
ControlinputsV
CC
=3.6v,v
在
=3.6vto5.5vorgnd
±
10
µ
一个
V
I
=V
CC
–0.7vto5.5v
±
20
I
I
V
CC
=3.6v,switchon,v
在
=V
CC
orGNDV
I
=0.7vtov
CC
–0.7v–40
µ
一个
V
I
=0to0.7v
±
5
I
OZ
(3)
V
CC
=3.6v,v
O
=0to5.5v,v
I
=0,switchoff,v
在
=V
CC
orGND
±
10
µ
一个
I
止
V
CC
=0,v
O
=0to5.5v,v
I
=0,10
µ
一个
V
I
=V
CC
orGND40
V
CC
=3.6v,i
i/o
=0,
I
CC
µ
一个
switchonoroff,v
在
=V
CC
orGND
V
I
=5.5v40
∆
I
CC
(4)
ControlinputsV
CC
=3vto3.6v,oneinputatv
CC
–0.6v,otherinputsatv
CC
orGND300
µ
一个
C
在
ControlinputsV
CC
=3.3v,v
在
=V
CC
orGND4pF
C
io(止)
V
CC
=3.3v,v
i/o
=5.5v,3.3v,orgnd,switchoff,v
在
=V
CC
orGND5pF
V
i/o
=5.5vor3.3v5
C
io(在)
V
CC
=3.3v,switchon,v
在
=V
CC
orGNDpF
V
i/o
=GND13
I
O
=24ma58.5
V
CC
=2.3v,typatv
CC
=2.5v,v
I
=0
I
O
=16ma58.5
r
在
(5)
Ω
I
O
=64mA57
V
CC
=3v,v
I
=0
I
O
=32mA57
(1)v
在
andI
在
refertocontrolinputs.v
I
,v
O
,i
I
,andi
O
refertodatapins.
(2)alltypicalvaluesareatv
CC
=3.3v(unlessotherwisenoted),t
一个
=25
°
c.
(3)fori/oports,theparameteri
OZ
includestheinputleakagecurrent.
(4)thisistheincreaseinsupplycurrentforeachinputthatisatthespecifiedttlvoltagelevel,ratherthanv
CC
orgnd.
(5)measuredbythevoltagedropbetweenaandbterminalsattheindicatedcurrentthroughtheswitch.在-stateresistanceisdetermined
bythelowerofthevoltagesofthetwo(aorb)terminals.
overrecommendedoperatingfree-airtemperaturerange(unlessotherwisenoted)(seefigure2)
V
CC
=2.5vv
CC
=3.3v
FROMTO
±
0.2v
±
0.3v
PARAMETERUNIT
(输入)(输出)
MINMAXMINMAX
t
pd
(1)
aorbbora0.150.25ns
t
en
oeaorb110.518ns
t
dis
oeaorb15.517.5ns
(1)thepropagationdelayisthecalculatedrctimeconstantofthetypicalon-stateresistanceoftheswitchandthespecifiedload
电容,whendrivenbyanidealvoltagesource(zerooutputimpedance).
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