SE555D Fast Delivery |IC PHOENIX CO.,LIMITED

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SE555D
GENERAL PURPOSE SINGLE BIPOLAR TIMERS
July 1998
DIP8
(Plastic Package)
SO8
(Plastic Micropackage) 1- GND- Trigger- Output- Reset- Control voltage- Threshold- Discharge VCC
PIN CONNECTIONS (top view) LOW TURN OFF TIME. MAXIMUM OPERATING FREQUENCY
GREATER THAN 500kHz. TIMING FROM MICROSECONDS TO HOURS. OPERATES IN BOTH ASTABLE AND
MONOSTABLE MODES. HIGH OUTPUT CURRENT CAN SOURCE OR
SINK 200mA. ADJUSTABLE DUTY CYCLE. TTL COMPATIBLE. TEMPERATURE STABILITY OF 0.005%
PERoC
ORDER CODES
Part
Number
Temperature
Range
Package
NE555 0oC,70oC ••
SA555 –40oC, 105oC ••
SE555 –55oC, 125oC ••
DESCRIPTION
The NE555monolithictiming circuitisahighlystable
controllercapableofproducingaccuratetime delays oscillation.In the time delay modeof operation,
the timeis precisely controlledby one external re-
sistorandcapacitor.For astableoperationasanos-
cillator, the free running frequency and the duty cy-
cle are both accurately controlled with two external
resistors and one capacitor.The circuit maybe trig-
gered and reseton falling waveforms, and theout-
put structure can sourceor sinkupto 200mA. The
NE555is availablein plastic and ceramic minidip
packageandina 8-lead micropackageandin metal
can package version.
NE555
SA555- SE555
GENERAL PURPOSE SINGLE BIPOLAR TIMERS
1/10
THRESHOLD
COMP
5kΩ
5kΩ
5kΩ
TRIGGER
FLIP-FLOP
DISCHARGE
OUT
INHIBIT/
RESET
RESET
COMP-8086
CONTROLVOLTAGE
VCC
BLOCK DIAGRAM
OUTPUT
CONTROL
VOLTAGE
THRESHOLD
COMPARATOR
VCC
4.7kΩ
830Ω Q6 Q7 Q8 Q9
4.7kΩ R41kΩR85kΩ Q3
Q10
Q11Q12
Q13
THRESHOLD
TRIGGER
RESET
DISCHARGE
GND
Q14
Q15
10kΩ
100kΩ
100kΩ R105kΩ
Q17
Q16 Q185kΩ D2
R16100Ω R154.7kΩ
R14220Ω
Q24
Q23
R174.7kΩ
Q22
Ρ13
Q19
Q20
Q21
R126.8kΩ
TRIGGER COMPARATOR FLIPFLOP
R11
5kΩ
3.9kΩ
SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vcc Supply Voltage 18 V
Toper Operating FreeAir Temperature Range for NE555
for SA555
for SE555
0to70
–40to 105
–55to 125C Junction Temperature 150 oC
Tstg Storage Temperature Range –65to 150 oC
NE555/SA555/SE555
2/10
ELECTRICAL CHARACTERISTICS
Tamb= +25oC, VCC= +5Vto +15V (unless otherwise specified)
Symbol Parameter SE555 NE555- SA555 Unit
Min. Typ. Max. Min. Typ. Max.
ICC Supply Current (RL∞)(- note1)
Low State VCC =+5V
VCC= +15V
High State VCC =5V
Timing Error (monostable)
(RA=2kto 100kΩ,C= 0.1μF)
Initial Accuracy- (note2)
Drift with Temperature
Drift with Supply Voltage
ppm/°C
%/V
Timing Error (astable)
(RA,RB =1kΩto 100kΩ,C= 0.1μF,
VCC= +15V)
Initial Accuracy- (note2)
Drift with Temperature
Drift with Supply Voltage
ppm/°C
%/V
VCL Control Voltage level
VCC= +15V
VCC =+5V
Vth Threshold Voltage
VCC= +15V
VCC =+5V
Ith Threshold Current- (note3) 0.1 0.25 0.1 0.25 μA
Vtrig Trigger Voltage
VCC= +15V
VCC =+5V
Itrig Trigger Current (Vtrig= 0V) 0.5 0.9 0.5 2.0 μA
Vreset Reset Voltage- (note4) 0.4 0.7 1 0.4 0.7 1 V
Ireset Reset Current
Vreset= +0.4V
Vreset =0V
VOL Low Level Output Voltage
VCC= +15V, IO(sink)= 10mA
IO(sink)= 50mA
IO(sink)= 100mA
IO(sink)= 200mA
VCC= +5V, IO(sink)= 8mA
IO(sink)= 5mA
VOH High Level Output Voltage
VCC= +15V, IO(source)= 200mA
IO(source)= 100mA
VCC= +5V, IO(source)= 100mA
Notes: 1. Supply current when outputis highis typically 1mA less. Testedat VCC= +5V andVCC= +15V. Thiswill determinethe maximum valueofRA +RBfor +15V operationthe max totalisR= 20MΩ andfor5V operation
the max totalR= 3.5MΩ.
OPERATING CONDITIONS
Symbol Parameter SE555 NE555- SA555 Unit
VCC Supply Voltage 4.5to18 4.5to18 V
Vth,Vtrig,Vcl,Vreset Maximum Input Voltage VCC VCC V
NE555/SA555/SE555
3/10
ELECTRICAL CHARACTERISTICS (continued)
Symbol Parameter SE555 NE555- SA555 UnitMin. Typ. Max. Min. Typ. Max.
Idis(off) Discharge Pin Leakage Current
(output high) (Vdis= 10V) 100 20 100 nA
Vdis(sat) Dischargepin Saturation Voltage
(output low)- (note5)
VCC= +15V,Idis= 15mA
VCC= +5V,Idis= 4.5mA
Output Rise Time
Output Fall Time
toff Turnoff Time- (note6) (Vreset =VCC) 0.5 0.5 μs
Notes: 5.No protection against excessivePin7 currentis necessary, providingthe package dissipation ratingwillnotbe exceeded. Time mesaured froma positive going input pulse from0to 0.8x VCCintothe thresholdtothe drop from hightolowofthe
output triggeristiedto treshold.
Figure1: Minimum Pulse Width Required for
Trigering
Figure2: Supply Current versus Supply Voltage
Figure3: Delay Time versus Temperature Figure4: Low Output Voltage versus Output
SinkCurrent
NE555/SA555/SE555
4/10
Figure5: Low Output Voltage versus Output
SinkCurrent
Figure6: Low Output Voltage versus Output
SinkCurrent
Figure7: High Output Voltage Drop versus
Output
Figure8: Delay Time versus Supply Voltage
Figure9: PropagationDelay versusVoltage
Levelof Trigger Value
NE555/SA555/SE555
5/10
CAPACITOR VOLTAGE= 2.0V/div=0.1ms/div
INPUT= 2.0V/div
OUTPUT VOLTAGE= 5.0V/div= 9.1kΩ, C1= 0.01μF,R= 1kΩL
Figure11
Reset
Trigger
Output
Control Voltage
0.01μF
NE555 to15VVCC
Figure10
(μF)
0.001 100 1.0 10 100 10 (t)dμs μs ms ms ms sΩ1M10kΩ10Ω
R1=kΩ
Figure12
APPLICATION INFORMATION
MONOSTABLE OPERATION the monostable mode, the timer functionsasa
one-shot.Referringto figure10 the external capaci-
toris initially held dischargedbya transistorinside
the timer.
Thecircuit triggersona negative-goinginput signal
when thelevel reaches1/3 Vcc. Once triggered,the
circuit remainsin this state until the set time has
elapsed, evenifitis triggered again during thisin-
terval.The durationof theoutputHIGHstateis givent= 1.1 R1C1 andis easily determinedby
figure 12.
Notice that since the charge rate and the threshold
levelof thecomparatorarebothdirectly proportional supply voltage, the timing intervalis independent
ofsupply. Applyinga negativepulse simultaneously the reset terminal (pin4) and the trigger terminal
(pin2) during the timing cycle discharges the exter-
nalcapacitor and causes thecycleto start over.The
timing cycle now startson the positive edgeof the
reset pulse. During the time the reset pulsein ap-
plied, the outputis driventoits LOW state.
When anegativetriggerpulseisappliedto pin2, the
flip-flopis set, releasing the short circuit across the
externalcapacitor anddriving the outputHIGH. The
voltage across the capacitor increases exponen-
tially with the time constantτ =R1C1. When the volt-
age across the capacitorequals2/3Vcc, thecompa-
ratorresetsthe flip-flop whichthendischargethe ca-
pacitor rapidly and drivers the outputtoits LOW
state.
Figure11 shows theactualwaveforms generatedin
thismodeof operation.
When Resetis not used,it shouldbe tied highto
avoid any possiblyor false triggering.
ASTABLE OPERATION
When the circuitis connectedas shownin figure13
(pin 2and6 connected)it triggers itself andfreerunsa multivibrator. The external capacitor charges
throughR1 andR2 and discharges throughR2only.
Thus the dutycycle may beprecisely setby theratio these two resistors. the astable modeof operation,C1 charges and
discharges between 1/3 Vcc and 2/3 Vcc. Asin the
triggeredmode,the chargeanddischargetimes and
therefore frequency are independentof the supply
voltage.
NE555/SA555/SE555
6/10

Partno	Mfg	Dc	Qty	Available	Descript
SE555D		N/a	5	avai	GENERAL PURPOSE SINGLE BIPOLAR TIMERS