L
B
H
A
B
t
R
Low-to-highratio
t
R
R
H
B
H
L
A
B
t
R
Outputwaveformdutycycle
1
t
t
R
2R
 
L
B
H
L
A
B
t
R
Outputdriverdutycycle
t
t
R
2R

A
B
1.44
frequency
R
2R C
H
L
A
B
period t
t
0.693 R
2R C
 
L
B
t
0.693 R
C
H
A
B
t
0.693 R
R C
GND
OUT
V
CC
CONT
RESET
DISCH
THRES
TRIG
C
R
B
R
A
Output
R
L
0.01 
m
F
V
CC
(5 V to 15 V)
(see Note A)
NOTE A: : Decoupling CONT voltage to ground with a capacitor can
improve operation. This should be evaluated for individual
applications.
Open
5
8
4
7
6
2
3
1
Pin numbers shown are for the D, JG, P, PS, and PW packages.
Voltage − 1 V/div
Time − 0.5 ms/div
t
H
Capacitor Voltage
Output Voltage
t
L
R
A
= 5 k
R
L
= 1 k
R
B
= 3 k
See Figure 12
C = 0.15 mF
NA555,NE555,SA555,SE555
www.ti.com
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
FeatureDescription(continued)
8.3.2 A-stableOperation
AsshowninFigure12,addingasecondresistor,R
B
,tothecircuitofFigure9andconnectingthetriggerinputto
thethresholdinputcausesthetimertoself-triggerandrunasamulti-vibrator.ThecapacitorCchargesthrough
R
A
andR
B
andthendischargesthroughR
B
only.Therefore,thedutycycleiscontrolledbythevaluesofR
A
and
R
B
.
ThisastableconnectionresultsincapacitorCcharginganddischargingbetweenthethreshold-voltagelevel(≈
0.67×V
CC
) and thetrigger-voltagelevel l (≈ 0.33× V
CC
). Asinthemono-stable circuit, chargeanddischarge
times(and,therefore,thefrequencyanddutycycle)areindependentofthesupplyvoltage.
Figure12.CircuitforAstableOperation
Figure13.TypicalAstableWaveforms
Figure 12shows typical waveformsgeneratedduringastableoperation.Theoutput high-level duration t
H
and
low-leveldurationt
L
canbecalculatedasfollows:
(1)
(2)
Otherusefulrelationshipsareshownbelow:
(3)
(4)
(5)
(6)
(7)
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V
CC
(5 V to 15 V)
DISCH
OUT
V
CC
RESET
R
L
R
A
A5T3644
C
THRES
GND
CONT
TRIG
Input
0.01 
m
F
Output
4
8
3
7
6
2
5
1
Pin numbers shown are shown for the D, JG, P, PS, and PW packages.
NA555,NE555,SA555,SE555
www.ti.com
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
9 ApplicationsandImplementation
NOTE
Information in the following applications sections is not part of the e TI I component
specification,andTIdoes not warrant its accuracy orcompleteness. TI’s customersare
responsiblefordeterminingsuitabilityofcomponentsfortheirpurposes.Customersshould
validateandtesttheirdesignimplementationtoconfirmsystemfunctionality.
9.1 ApplicationInformation
Thexx555 timerdevicesuse resistor and capacitor chargingdelay toprovide aprogrammabletimedelay or
operatingfrequency.Thissectionpresentsasimplifieddiscussionofthedesignprocess.
9.2 TypicalApplications
9.2.1 Missing-PulseDetector
Thecircuit shownin Figure16 canbe used to detect a missing pulse or abnormally longspacing between
consecutivepulsesinatrainofpulses.Thetimingintervalofthemonostablecircuitisre-triggeredcontinuously
by theinput pulsetrainas longas thepulsespacingisless than thetiminginterval.A longerpulsespacing,
missingpulse,orterminatedpulsetrainpermitsthetimingintervaltobecompleted,therebygeneratinganoutput
pulseasshowninFigure17.
Figure16. CircuitforMissing-PulseDetector
9.2.1.1 DesignRequirements
Inputfault(missingpulses)mustbeinputhigh.Inputstucklowwillnotbedetectedbecausetimingcapacitor"C"
willremaindischarged.
9.2.1.2 DetailedDesignProcedure
ChooseR
A
andCsothatR
A
×C>[maximumnormalinputhightime].R
L
improvesV
OH
,butitisnotrequiredfor
TTLcompatibility.
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THRES
GND
C
R
A
R
L
V
CC
(5 V to 15 V)
Output
DISCH
OUT
V
CC
RESET
TRIG
CONT
Modulation
Input
(see Note A)
Clock
Input
NOTE A: : The modulating signal can be direct or capacitively coupled
to CONT. For direct coupling, the effects of modulation source
voltage and impedance on the bias of the timer should be
considered.
4
8
3
7
6
2
5
Pin numbers shown are for the D, JG, P, PS, and PW packages.
1
Time − 0.1 ms/div
Voltage − 2 V/div
V
CC
= 5 V
R
A
= 1 kW
C = 0.1 mF
See Figure 15
Capacitor Voltage
Output Voltage
Input Voltage
NA555,NE555,SA555,SE555
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
www.ti.com
TypicalApplications(continued)
9.2.1.3 ApplicationCurves
Figure17.CompletedTimingWaveformsforMissing-PulseDetector
9.2.2 Pulse-WidthModulation
Theoperationofthetimercanbemodifiedbymodulatingtheinternal thresholdandtriggervoltages, whichis
accomplishedbyapplyinganexternalvoltage(orcurrent)toCONT.Figure18showsacircuit forpulse-width
modulation. A continuous input pulsetraintriggersthemonostable circuit, andacontrol signal modulatesthe
thresholdvoltage.Figure19showstheresultingoutputpulse-widthmodulation.Whileasine-wavemodulation
signalisshown,anywaveshapecouldbeused.
Figure18. CircuitforPulse-WidthModulation
14
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Voltage − 2 V/div
Time − 0.5 ms/div
Capacitor Voltage
Output Voltage
Clock Input Voltage
R
A
= 3 kW
C = 0.02 mF
R
L
= 1 kW
See Figure 18
ÏÏ
Modulation Input Voltage
NA555,NE555,SA555,SE555
www.ti.com
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
TypicalApplications(continued)
9.2.2.1 DesignRequirements
ClockinputmusthaveV
OL
andV
OH
levelsthatarelessthanandgreaterthan1/3VCC.Modulationinputcan
vary from m ground to VCC. . The application must betolerant of a nonlinear transfer function; the relationship
betweenmodulationinputandpulsewidthisnotlinearbecausethecapacitorchargeisbasedRConannegative
exponentialcurve.
9.2.2.2 DetailedDesignProcedure
ChooseR
A
andC sothat R
A
×C =1/4 [clock inputperiod]. R
L
improvesV
OH
, but itis notrequiredfor TTL
compatibility.
9.2.2.3 ApplicationCurves
Figure19.Pulse-Width-ModulationWaveforms
9.2.3 Pulse-PositionModulation
As shown in Figure 20, any of these timers can be used as a pulse-position modulator. This application
modulatesthethreshold voltage and, thereby, thetime delay, ofa free-running oscillator. Figure 21 showsa
triangular-wavemodulationsignalforsuchacircuit;however,anywaveshapecouldbeused.
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R
B
Modulation
Input
(see Note A)
CONT
TRIG
RESET
V
CC
OUT
DISCH
V
CC
(5 V to 15 V)
R
L
R
A
C
GND
THRES
NOTE A: : The modulating signal can be direct or capacitively coupled
to CONT. For direct coupling, the effects of modulation
source voltage and impedance on the bias of the timer
should be considered.
Pin numbers shown are for the D, JG, P, PS, and PW packages.
4
8
3
7
6
2
5
Output
NA555,NE555,SA555,SE555
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
www.ti.com
TypicalApplications(continued)
Figure20. CircuitforPulse-PositionModulation
9.2.3.1 DesignRequirements
BothDCandAC coupledmodulationinputwill changethe upper and lowervoltagethresholds forthetiming
capacitor.Bothfrequencyanddutycyclewillvarywiththemodulationvoltage.
9.2.3.2 DetailedDesignProcedure
ThenominaloutputfrequencyanddutycyclecanbedeterminedusingformulasinA-stableOperationsection.R
L
improvesV
OH
,butitisnotrequiredforTTLcompatibility.
16
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S
V
CC
RESET
V
CC
OUT
DISCH
GND
CONT
TRIG
4
8
3
7
6
1
5
2
THRES
R
C
C
C
0.01
C
C
= 14.7 mF
R
C
= 100 kW
Output C
RESET
V
CC
OUT
DISCH
GND
CONT
TRIG
4
8
3
7
6
1
5
2
THRES
R
B
33 kW
0.001
0.01
mF
C
B
= 4.7 mF
R
B
= 100 kW
Output B
Output A
R
A
= 100 kW
C
A
= 10  mF
mF
0.01
mF
0.001
33 kW
RA
THRES
2
5
1
6
7
3
8
4
TRIG
CONT
GND
DISCH
OUT
V
CC
RESET
mF
mF
C
B
C
A
Pin numbers shown are for the D, JG, P, PS, and PW packages.
NOTE A: : S closes momentarily at t = 0.
Voltage − 2 V/div
R
A
= 3 kW
R
B
= 500 W
R
L
= 1 kW
See Figure 20
Capacitor Voltage
Output Voltage
ÎÎÎÎÎÎ
Modulation Input Voltage
Time − 0.1 ms/div
NA555,NE555,SA555,SE555
www.ti.com
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
TypicalApplications(continued)
9.2.3.3 ApplicationCurves
Figure21.Pulse-Position-ModulationWaveforms
9.2.4 SequentialTimer
Many applications, such as computers, require e signals s for r initializing conditions s during g start-up. . Other
applications,suchastestequipment,requireactivationoftestsignalsinsequence.Thesetimingcircuitscanbe
connected to provide such sequential control. The timers can be usedin various combinations of astable or
monostable circuitconnections,with orwithoutmodulation,for extremelyflexible waveform m control. Figure22
shows a a sequencer r circuit with possible applications in many y systems, , and Figure 23 shows s the output
waveforms.
Figure22. SequentialTimerCircuit
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Voltage − 5 V/div
t − Time − 1 s/div
See Figure 22
Output A
Output B
Output C
t = 0
t
w
C = 1.1 R
C
C
C
t
w
C
t
w
B = 1.1 R
B
C
B
t
w
A = 1.1 R
A
C
A
t
w
A
t
w
B
NA555,NE555,SA555,SE555
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
www.ti.com
TypicalApplications(continued)
9.2.4.1 DesignRequirements
Thesequentialtimerapplicationchainstogethermultiplemono-stabletimers.Thejoiningcomponentsarethe33-
kΩ resistors and d 0.001-µF F capacitors. . The output t high h to low w edge e passes a 10-µs s start t pulse to the next
monostable.
9.2.4.2 DetailedDesignProcedure
Thetimingresistorsandcapacitorscanbechosenusingthisformula.t
w
=1.1×R×C.
9.2.4.3 ApplicationCurves
Figure23.SequentialTimerWaveforms
10 PowerSupplyRecommendations
Thedevices are designedtooperatefrom aninput voltage supply range between4.5V and 16V.(18V for
SE555). A bypass capacitor is highly recommended d from VCC C to ground pin; ceramic 0.1 µF F capacitor is
sufficient.
18
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NA555,NE555,SA555,SE555
www.ti.com
SLFS022I–SEPTEMBER1973–REVISEDSEPTEMBER2014
11 DeviceandDocumentationSupport
11.1 RelatedLinks
The table below lists quick k access s links. Categories include technical l documents, , support and community
resources,toolsandsoftware,andquickaccesstosampleorbuy.
Table2.RelatedLinks
TECHNICAL
TOOLS&
SUPPORT&
PARTS
PRODUCTFOLDER
SAMPLE&BUY
DOCUMENTS
SOFTWARE
COMMUNITY
NA555
Clickhere
Clickhere
Clickhere
Clickhere
Clickhere
NE555
Clickhere
Clickhere
Clickhere
Clickhere
Clickhere
SA555
Clickhere
Clickhere
Clickhere
Clickhere
Clickhere
SE555
Clickhere
Clickhere
Clickhere
Clickhere
Clickhere
11.2 Trademarks
Alltrademarksarethepropertyoftheirrespectiveowners.
11.3 ElectrostaticDischargeCaution
This integrated circuit t can n be e damaged by y ESD. Texas Instruments recommends that t all l integrated circuits be handled d with
appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore
susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
11.4 Glossary
SLYZ022TIGlossary.
Thisglossarylistsandexplainsterms,acronymsanddefinitions.
12 Mechanical,Packaging,andOrderableInformation
The following pages s include e mechanical packaging g and d orderable e information. This information is the most
currentdataavailableforthedesignateddevices.Thisdataissubjecttochangewithoutnoticeandrevisionof
thisdocument.Forbrowserbasedversionsofthisdatasheet,refertothelefthandnavigation.
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PACKAGE OPTION ADDENDUM
www.ti.com
31-Jan-2016
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type
Package
Drawing
Pins
Package
Qty
Eco Plan
(2)
Lead/Ball Finish
(6)
MSL Peak Temp
(3)
Op Temp (°C)
Device Marking
(4/5)
Samples
JM38510/10901BPA
ACTIVE
CDIP
JG
8
1
TBD
A42
N / A for Pkg Type
-55 to 125
JM38510
/10901BPA
M38510/10901BPA
ACTIVE
CDIP
JG
8
1
TBD
A42
N / A for Pkg Type
-55 to 125
JM38510
/10901BPA
NA555D
ACTIVE
SOIC
D
8
75
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 105
NA555
NA555DG4
ACTIVE
SOIC
D
8
75
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 105
NA555
NA555DR
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 105
NA555
NA555DRG4
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
-40 to 105
NA555
NA555P
ACTIVE
PDIP
P
8
50
Pb-Free
(RoHS)
CU NIPDAU | CU SN
N / A for Pkg Type
-40 to 105
NA555P
NA555PE4
ACTIVE
PDIP
P
8
50
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
-40 to 105
NA555P
NE555D
ACTIVE
SOIC
D
8
75
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
NE555
NE555DE4
ACTIVE
SOIC
D
8
75
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
NE555
NE555DG4
ACTIVE
SOIC
D
8
75
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
NE555
NE555DR
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU | CU SN
Level-1-260C-UNLIM
0 to 70
NE555
NE555DRE4
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
NE555
NE555DRG3
PREVIEW
SOIC
D
8
TBD
Call TI
Call TI
0 to 70
NE555
NE555DRG4
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
CU NIPDAU
Level-1-260C-UNLIM
0 to 70
NE555
NE555P
ACTIVE
PDIP
P
8
50
Pb-Free
(RoHS)
CU NIPDAU | CU SN
N / A for Pkg Type
0 to 70
NE555P
NE555PE3
PREVIEW
PDIP
P
8
TBD
Call TI
Call TI
0 to 70
NE555P
NE555PE4
ACTIVE
PDIP
P
8
50
Pb-Free
(RoHS)
CU NIPDAU
N / A for Pkg Type
0 to 70
NE555P
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