www.德州仪器.com
可调整的 voltage version fixed voltage version
重置
逻辑
计时器
+
−
90k
V
DD
V
DD
地
0.4v
V
REF
SENSE
MR
C
T
重置
TPS3808G01
可调整的 电压
重置
逻辑
计时器
+
−
90k
V
DD
V
DD
地
0.4v
V
REF
SENSE
MR
C
T
重置
R
1
R
2
R
1
+ R
2
= 4M
Ω
PINASSIGNMENTS
DBV 包装
SOT23
(顶 视图)
V
DD
SENSE
C
T
重置
地
MR
1
2
3
6
5
4
重置
地
MR
6
5
4
V
DD
SENSE
C
T
1
2
3
DRV 包装
2mm x 2mm QFN
(顶 视图)
电源
垫子
TPS3808
SBVS050E–MAY2004–REVISEDOCTOBER2005
FUNCTIONALBLOCKDIAGRAMS
figure1.adjustableandfixedvoltageversions
TERMINALFUNCTIONS
终端
sot23(dbv)
namepinno.描述
reset1resetisanopendrainoutputthatisdriventoalowimpedancestatewhenresetisasserted(eitherthe
senseinputislowerthanthethresholdvoltage(v
它
)orthemrpinissettoalogiclow).resetwillremain
低(asserted)fortheresetperiodafterbothsenseisabovev
它
andmrissettoalogichigh.apull-向上
resistorfrom10k
Ω
to1M
Ω
shouldbeusedonthispin,andallowstheresetpintoattainvoltageshigherthan
V
DD
.
GND2Ground
mr3drivingthemanualresetpin(mr)lowassertsreset.mrisinternallytiedtov
DD
bya90k
Ω
拉-向上
电阻.
C
T
4resetperiodprogrammingpin.connectingthispintov
DD
througha40k
Ω
to200k
Ω
resistororleavingit
openresultsinfixeddelaytimes(看
ElectricalCharacteristics
).connectingthispintoagroundreferenced
电容
≥
100pfgivesauser-programmabledelaytime.看
SelectingTheResetDelayTime
inthe
DeviceOperation
sectionformoreinformation.
sense5thispinisconnectedtothevoltagetobemonitored.ifthevoltageatthisterminaldropsbelowthethreshold
voltageV
它
,thenresetisasserted.
V
DD
6supplyvoltage.itisgoodanalogdesignpracticetoplacea0.1
µ
fceramiccapacitorclosetothispin.
powerpadpowerpad.connecttogroundplanetoenhancethermalperformanceofpackage.
4
: 点此下载
