LM555 Timer LM555 highly stable device generating accurate time d

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LM555 Timer LM555 highly stable device generating accurate time d

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LM555 Timer
LM555 Timer
LM555 highly stable device generating accurate time delays oscillation. Additional terminals provided triggering resetting desired. time delay mode operation, time precisely controlled external resistor capacitor. astable operation oscillator, free running frequency duty cycle accurately controlled with external resistors capacitor. circuit triggered reset falling waveforms, output circuit source sink 200mA drive circuits.
Features
Direct replacement SE555/NE555 Timing from microseconds through hours Operates both astable monostable modes Adjustable duty cycle Output source sink Output supply compatible Temperature stability better than 0.005% Normally normally output Available 8-pin MSOP package
Applications
Precision timing Pulse generation Sequential timing Time delay generation Pulse width modulation Pulse position modulation Linear ramp generator
Schematic Diagram
DS007851-1
2000 National Semiconductor Corporation
DS007851
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LM555
Connection Diagram
Dual-In-Line, Small Outline Molded Mini Small Outline Packages
DS007851-3
View
Ordering Information
Package 8-Pin SOIC 8-Pin MSOP 8-Pin MDIP Part Number LM555CM LM555CMX LM555CMM LM555CMMX LM555CN Package Marking LM555CM LM555CM LM555CN Media Transport Rails 2.5k Units Tape Reel Units Tape Reel 3.5k Units Tape Reel Rails Drawing M08A MUA08A N08E
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LM555
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. Supply Voltage Power Dissipation (Note LM555CM, LM555CN LM555CMM Operating Temperature Ranges LM555C Storage Temperature Range +18V 1180 +70°C -65°C +150°C
Soldering Information Dual-In-Line Package Soldering Seconds) 260°C Small Outline Packages (SOIC MSOP) Vapor Phase Seconds) 215°C Infrared Seconds) 220°C AN-450 "Surface Mounting Methods Their Effect Product Reliability" other methods soldering surface mount devices.
Electrical Characteristics (Notes
25°C, +15V, unless othewise specified) Parameter Conditions Supply Voltage Supply Current 15V, (Low State) (Note Limits LM555C Units
Timing Error, Monostable Initial Accuracy Drift with Temperature Accuracy over Temperature Drift with Supply Timing Error, Astable Initial Accuracy Drift with Temperature Accuracy over Temperature Drift with Supply Threshold Voltage Trigger Voltage Trigger Current Reset Voltage Reset Current Threshold Current Control Voltage Level Leakage Output High (Note Output Output 15V, 15mA 4.5V, 4.5mA (Note 100k, 0.1µF, (Note 0.30 0.667 1.67 3.33 0.25 2.25 ppm/°C 100k, 0.1µF, (Note ppm/°C
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LM555
Electrical Characteristics (Notes
Parameter
(Continued)
25°C, +15V, unless othewise specified) Conditions Output Voltage Drop (Low) ISINK 10mA ISINK 50mA ISINK 100mA ISINK 200mA ISINK ISINK Output Voltage Drop (High) ISOURCE 200mA, ISOURCE 100mA, Rise Time Output Fall Time Output
Note voltages measured with respect ground pin, unless otherwise specified. Note Absolute Maximum Ratings indicate limits beyond which damage device occur. Operating Ratings indicate conditions which device functional, guarantee specific performance limits. Electrical Characteristics state electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that device within Operating Ratings. Specifications guaranteed parameters where limit given, however, typical value good indication device performance. Note operating elevated temperatures device must derated above 25°C based +150°C maximum junction temperature thermal resistance 106°C/W (DIP), 170°C/W (S0-8), 204°C/W (MSOP) junction ambient. Note Supply current when output high typically less Note Tested 15V. Note This will determine maximum value operation. maximum total 20M. Note protection against excessive current necessary providing package dissipation rating will exceeded. Note Refer RETS555X drawing military LM555H LM555J versions specifications.
Limits LM555C 0.25 0.75
Units
0.25 12.5 12.75 2.75 13.3
0.35
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LM555
Typical Performance Characteristics
Minimuim Pulse Width Required Triggering Supply Current Supply Voltage
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High Output Voltage Output Source Current
Output Voltage Output Sink Current
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Output Voltage Output Sink Current
Output Voltage Output Sink Current
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LM555
Typical Performance Characteristics
Output Propagation Delay Voltage Level Trigger Pulse
(Continued)
Output Propagation Delay Voltage Level Trigger Pulse
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Discharge Transistor (Pin Voltage Sink Current
Discharge Transistor (Pin Voltage Sink Current
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LM555
Applications Information
MONOSTABLE OPERATION this mode operation, timer functions one-shot (Figure external capacitor initially held discharged transistor inside timer. Upon application negative trigger pulse less than flip-flop which both releases short circuit across capacitor drives output high. NOTE: monostable operation, trigger should driven high before timing cycle.
DS007851-7
FIGURE Time Delay ASTABLE OPERATION circuit connected shown Figure (pins connected) will trigger itself free multivibrator. external capacitor charges through discharges through Thus duty cycle precisely ratio these resistors.
DS007851-5
FIGURE Monostable voltage across capacitor then increases exponentially period which time voltage equals VCC. comparator then resets flip-flop which turn discharges capacitor drives output state. Figure shows waveforms generated this mode operation. Since charge threshold level comparator both directly proportional supply voltage, timing internal independent supply.
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FIGURE Astable
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TIME ms/DIV. 9.1k 0.01µF
Trace: Input 5V/Div. Middle Trace: Output 5V/Div. Bottom Trace: Capacitor Voltage 2V/Div.
this mode operation, capacitor charges discharges between VCC. triggered mode, charge discharge times, therefore frequency independent supply voltage.
FIGURE Monostable Waveforms During timing cycle when output high, further application trigger pulse will effect circuit long trigger input returned high least 10µs before timing interval. However circuit reset during this time application negative pulse reset terminal (pin output will then remain state until trigger pulse again applied. When reset function use, recommended that connected avoid possibility false triggering.
Figure nomograph easy determination values various time delays.
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LM555
Applications Information
(Continued)
Figure shows waveforms generated this mode operation.
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TIME 20µs/DIV. 9.1k 0.01µF
Trace: Input 4V/Div. Middle Trace: Output 2V/Div. Bottom Trace: Capacitor 2V/Div.
TIME 20µs/DIV. 3.9k 0.01µF
Trace: Output 5V/Div. Bottom Trace: Capacitor Voltage 1V/Div.
FIGURE Frequency Divider PULSE WIDTH MODULATOR When timer connected monostable mode triggered with continuous pulse train, output pulse width modulated signal applied Figure shows circuit, Figure some waveform examples.
FIGURE Astable Waveforms charge time (output high) given 0.693 discharge time (output low) 0.693 (RB) Thus total period 0.693 +2RB) frequency oscillation
Figure used quick determination these values. duty cycle
DS007851-12
FIGURE Pulse Width Modulator
DS007851-13 DS007851-10
FIGURE Free Running Frequency FREQUENCY DIVIDER monostable circuit Figure used frequency divider adjusting length timing cycle. Figure shows waveforms generated divide three circuit.
Trace: Modulation 1V/Div. TIME ms/DIV. Bottom Trace: Output Voltage 2V/Div. 9.1k 0.01µF
FIGURE Pulse Width Modulator
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LM555
Applications Information
PULSE POSITION MODULATOR
(Continued)
This application uses timer connected astable operation, Figure with modulating signal again applied control voltage terminal. pulse position varies with modulating signal, since threshold voltage hence time delay varied. Figure shows waveforms generated triangle wave modulation signal.
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FIGURE
Figure shows waveforms generated linear ramp. time interval given
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FIGURE Pulse Position Modulator
0.6V
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TIME ms/DIV. 3.9k 0.01µF
Trace: Modulation Input 1V/Div. Bottom Trace: Output 2V/Div.
Trace: Input 3V/Div. TIME 20µs/DIV. Middle Trace: Output 5V/Div. Bottom Trace: Capacitor Voltage 1V/Div. 100k 0.01
FIGURE Linear Ramp
FIGURE Pulse Position Modulator LINEAR RAMP When pullup resistor, monostable circuit replaced constant current source, linear ramp generated. Figure shows circuit configuration that will perform this function.
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LM555
Applications Information
DUTY CYCLE OSCILLATOR
(Continued)
duty cycle, resistors connected Figure time period output high same previous, 0.693 output
Thus frequency oscillation
DS007851-18
FIGURE Duty Cycle Oscillator Note that this circuit will oscillate greater 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. Lower comparator storage time long 10µs when driven fully ground triggering. This limits monostable pulse width 10µs minimum. Delay time reset output 0.47µs typical. Minimum reset pulse width must 0.3µs, typical. current switches within 30ns output (pin voltage.
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LM555
Physical Dimensions
inches (millimeters) unless otherwise noted
Small Outline Package Package Number M08A
8-Lead (0.118" Wide) Molded Mini Small Outline Package Package Number MUA08A
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LM555 Timer
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
Molded Dual-In-Line Package Package Number N08E
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: 180-530 Email: europe.support@nsc.com Deutsch Tel: 9508 6208 English Tel: 2171 Tel: 8790
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com
National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LM555 Timer LM555 highly stable device generating accurate time d

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