GENERAL PURPOSE SINGLE BIPOLAR TIMERS TURN TIME MAXIMUM OPERATING
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NE555 SA555 SE555
GENERAL PURPOSE SINGLE BIPOLAR TIMERS
TURN TIME MAXIMUM OPERATING FREQUENCY GREATER THAN 500kHz TIMING FROM MICROSECONDS HOURS OPERATES BOTH ASTABLE MONOSTABLE MODES HIGH OUTPUT CURRENT SOURCE SINK 200mA ADJUSTABLE DUTY CYCLE COMPATIBLE TEMPERATURE STABILITY 0.005% PERoC
DIP8 (Plastic Package) (Plastic Micropackage)
DESCRIPTION NE555 monolithic timing circuit highly stable controller capable producing accurate time delays oscillation. time delay mode operation, time precisely controlled external resistor capacitor. stable operation oscillator, free running frequency duty cycle both accurately controlled with external resistors capacitor. circuit triggered reset falling waveforms, output structure source sink 200mA. NE555 available plastic ceramic minidip package 8-lead micropackage metal package version. CONNECTIONS (top view)
ORDER CODES
Part Number NE555 SA555 SE555 Temperature Range 0oC, 70oC -55oC, 125oC
Package
Trigger Output Reset Control voltage Threshold Discharge
July 1998
1/10
NE555/SA555/SE555
BLOCK DIAGRAM
VCC+
COMP THRESHOLD CONTROL VOLTAGE FLIP-FLOP COMP TRIGGER
DISCHARGE
INHIBIT/ RESET
RESET
8086
SCHEMATIC DIAGRAM
CONTROL VOLTAGE THRESHOLD COMPARATOR 4.7kW 830W 4.7kW 6.8kW THRESHOLD TRIGGER RESET DISCHARGE 10kW 100kW 100kW 100W 4.7kW 4.7kW 3.9kW 220W OUTPUT
TRIGGER COMPARATOR
FLIP FLOP
ABSOLUTE MAXIMUM RATINGS
Symbol Toper Supply Voltage Operating Free Temperature Range NE555 SA555 SE555 Parameter Value Unit
Tstg
Junction Temperature Storage Temperature Range
2/10
NE555/SA555/SE555
OPERATING CONDITIONS
Symbol Vth, Vtrig, Vcl, Vreset Supply Voltage Maximum Input Voltage Parameter SE555 NE555 SA555 Unit
ELECTRICAL CHARACTERISTICS Tamb +25oC, +15V (unless otherwise specified)
Symbol Parameter Supply Current note State +15V High State Timing Error (monostable) 100k, 0.1µF) Initial Accuracy (note Drift with Temperature Drift with Supply Voltage Timing Error (astable) (RA, 100k, 0.1µF, +15V) Initial Accuracy (note Drift with Temperature Drift with Supply Voltage Control Voltage level +15V Threshold Voltage +15V Threshold Current (note Trigger Voltage +15V Trigger Current (Vtrig Reset Voltage (note Reset Current Vreset +0.4V Vreset Level Output Voltage +15V, IO(sink) 10mA IO(sink) 50mA IO(sink) 100mA IO(sink) 200mA +5V, IO(sink) IO(sink) High Level Output Voltage +15V, IO(source) 200mA IO(source) 100mA +5V, IO(source) 100mA 0.05 12.5 13.3 0.15 0.25 0.25 12.5 13.3 0.25 0.75 0.35 12.75 2.75 1.45 SE555 Min. Typ. Max. NE555 SA555 Min. Typ. Max. Unit
0.05
ppm/°C
0.15 3.33 3.33 1.67 10.4 10.6 0.25
2.25 3.33 3.33 1.67
ppm/°C
11.2 0.25
Vtrig
Itrig Vreset Ireset
Notes
Supply current when output high typically less. Tested +15V. This will determine maximum value +15V operation total operation total 3.5M.
3/10
NE555/SA555/SE555
ELECTRICAL CHARACTERISTICS (continued)
Symbol Idis(off) Vdis(sat) Parameter Discharge Leakage Current (output high) (Vdis 10V) Discharge Saturation Voltage (output low) (note +15V, Idis 15mA +5V, Idis 4.5mA Output Rise Time Output Fall Time Turn Time (note (Vreset VCC) SE555 Min. Typ. Max. NE555 SA555 Min. Typ. Max. Unit
toff
Notes
protection against excessive current necessary, providing package dissipation rating will exceeded. Time mesaured from positive going input pulse from 0.8x into threshold drop from high output trigger tied treshold.
Figure Minimum Pulse Width Required Trigering
Figure Supply Current versus Supply Voltage
Figure Delay Time versus Temperature
Figure Output Voltage versus Output Sink Current
4/10
NE555/SA555/SE555
Figure Output Voltage versus Output Sink Current Figure Output Voltage versus Output Sink Current
Figure High Output Voltage Drop versus Output
Figure Delay Time versus Supply Voltage
Figure Propagation Delay versus Voltage Level Trigger Value
5/10
NE555/SA555/SE555
APPLICATION INFORMATION MONOSTABLE OPERATION monostable mode, timer functions one-shot. Referring figure external capacitor initially held discharged transistor inside timer. Figure
OUTPUT VOLTAGE 5.0V/div
Figure
INPUT 2.0V/div
Reset
Trigger
NE555
Output
CAPACITOR VOLTAGE 2.0V/div
Control Voltage 0.01µF
9.1k, 0.01µF,
Figure
circuit triggers negative-going input signal when level reaches Vcc. Once triggered, circuit remains this state until time elapsed, even triggered again during this interval. duration output HIGH state given R1C1 easily determined figure Notice that since charge rate threshold level comparator both directly proportional supply voltage, timing interval independent supply. Applying negative pulse simultaneously reset terminal (pin trigger terminal (pin during timing cycle discharges external capacitor causes cycle start over. timing cycle starts positive edge reset pulse. During time reset pulse applied, output driven state. When negative trigger pulse applied flip-flop set, releasing short circuit across external capacitor driving output HIGH. voltage across capacitor increases exponentially with time constant R1C1. When voltage across capacitor equals Vcc, comparator resets flip-flop which then discharge capacitor rapidly drivers output state. Figure shows actual waveforms generated this mode operation. When Reset used, should tied high avoid possibly false triggering.
6/10
(µF)
0.01 0.001
ASTABLE OPERATION When circuit connected shown figure (pin connected) triggers itself free runs multivibrator. external capacitor charges through discharges through only. Thus duty cycle precisely ratio these resistors. astable mode operation, charges discharges between Vcc. triggered mode, charge discharge times therefore frequency independent supply voltage.
NE555/SA555/SE555
Figure
Figure Free Running Frequency versus
Output
(µF)
NE555
Control Voltage 0.01µF
0.01 0.001
Figure shows actual waveforms generated this mode operation. charge time (output HIGH) given 0.693 discharge time (output LOW) 0.693 (R2) Thus total period given 0.693 2R2) frequency ofoscillation them 1.44 2R2) easily found figure duty cycle given
(Hz)
PULSE WIDTH MODULATOR When timer connected monostable mode triggered with continuous pulse train, output pulse width modulated signal applied Figure shows circuit. Figure Pulse Width Modulator.
Figure
Trigger
NE555
OUTPUT VOLTAGE 5.0V/div
Output
Modulation Input
CAPACITOR VOLTAGE 1.0V/div
4.8k, 0.1µF,
7/10
NE555/SA555/SE555
LINEAR RAMP When pullup resistor, monostable circuit replaced constant current source, linear ramp generated. Figure shows circuit configuration that will perform this function. Figure DUTY CYCLE OSCILLATOR duty cycle resistors connected figure time preriod output high same previous, 0.693 output [(RARB) RB)] Note that this circuit will oscillate greater Figure Duty Cycle Oscillator.
2N4250 equiv.
Output
Trigger
Thus frequency oscillation
NE555
0.01µF
NE55
Figure shows waveforms generator linear ramp. time interval given (2/3 (R1+ 0.6V (R1+ Figure Linear Ramp.
0.01µF
0.01µF
than because junction cannot bring down trigger lower comparator. ADDITIONAL INFORMATION Adequate power supply bypassing necessary protect associated circuitry. Minimum recommended 0.1µF parallel with electrolytic.
Time 20µs/DIV 100k 2.7k 0.01µF
trace input 3V/DIV Middle trace output 5V/DIV Bottom trace output 5V/DIV Bottom trace capacitor voltage 1V/DIV
8/10
NE555/SA555/SE555
PACKAGE MECHANICAL DATA PINS PLASTIC
Dimensions
Min. 0.51 1.15 0.356 0.204 7.95
Millimeters Typ. 3.32
Max.
Min. 0.020 0.045 0.014 0.008 0.313
Inches Typ. 0.131
Max.
1.65 0.55 0.304 10.92 9.75 2.54 7.62 7.62 5.08 3.81 1.52
0.065 0.022 0.012 0.430 0.384 0.100 0.300 0.300 0260 0.200 0.150 0.060
9/10
DIP8.TBL
3.18
0.125
PM-DIP8.EPS
NE555/SA555/SE555
PACKAGE MECHANICAL DATA PINS PLASTIC MICROPACKAGE (SO)
Dimensions
Min. 0.65 0.35 0.19 0.25
Millimeters Typ.
Max. 1.75 0.25 1.65 0.85 0.48 0.25 (typ.)
Min. 0.004 0.026 0.014 0.007 0.010 0.189 0.228
Inches Typ.
Max. 0.069 0.010 0.065 0.033 0.019 0.010 0.020 0.197 0.244
1.27 3.81 1.27 (max.) 0.150 0.016
0.050 0.150 0.157 0.050 0.024
Information furnished believed accurate reliable. However, STMicroelectronics assumes responsibility consequences such information infringement patents other rights third parties which result from use. license granted implication otherwise under patent patent rights STMicroelectronics. Specifications mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. STMicroelectronics products authorized critical components life support devices systems without express written approval STMicroelectronics. logo trademark STMicroelectronics 1998 STMicroelectronics Printed Italy Rights Reserved STMicroelectronics GROUP COMPANIES Australia Brazil Canada China France Germany Italy Japan Korea Malaysia Malta Mexico Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thailand United Kingdom U.S.A.
ORDER CODE
10/10
SO8.TBL
PM-SO8.EPS
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