Circuito Integrado 555

LM555 LM555C Timer

February 1995

LM555 LM555C Timer
General Description
The LM555 is a highly stable device for generating accurate time delays or oscillation Additional terminals are provided for triggering or resetting if desired In the time delay mode of operation the time is precisely controlled by one external resistor and capacitor For astable operation as an oscillator the freerunning frequency and duty cycle are accurately controlled with two external resistors and one capacitor The circuit may be triggered and reset on falling waveforms and the output circuit can source or sink up to 200 mA or drive TTL circuits
Y Y Y Y Y

Adjustable duty cycle Output can source or sink 200 mA Output and supply TTL compatible Temperature stability better than 0 005% per C Normally onand normally off output

Applications
Y Y Y

Features
Y Y Y

Y Y Y Y

Direct replacement for SE555 NE555 Timing from microseconds through hours Operates in both astable and monostable modes

Precision timing Pulse generation Sequential timing Time delay generation Pulse width modulation Pulse position modulation Linear ramp generator

Schematic Diagram

TL H 7851 – 1

C1995National Semiconductor Corporation

TL H 7851

RRD-B30M115 Printed in U S A

Absolute Maximum Ratings
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Power Dissipation (Note 1) LM555H LM555CH LM555 LM555CN Operating Temperature Ranges LM555C LM555
a 18V

StorageTemperature Range Soldering Information Dual-In-Line Package Soldering (10 Seconds) Small Outline Package Vapor Phase (60 Seconds) Infrared (15 Seconds)

b 65 C to a 150 C

260 C

760 mW 1180 mW 0 C to a 70 C b 55 C to a 125 C

215 C 220 C See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ for other methods of soldering surface mount devices

ElectricalCharacteristics (TA e 25 C
Parameter Conditions

VCC e a 5V to a 15V unless othewise specified) Limits LM555 Min Typ Max 18 3 10 5 12 Min 45 3 10 LM555C Typ Max 16 6 15 V mA mA Units

Supply Voltage Supply Current VCC e 5V RL e % VCC e 15V RL e % (Low State) (Note 2)

45

Timing Error Monostable Initial Accuracy Drift with Temperature Accuracy over Temperature Drift with Supply Timing Error AstableInitial 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 Pin 7 Leakage Output High Pin 7 Sat (Note 5) Output Low Output Low

RA e 1k to 100 kX C e 0 1 mF (Note 3)

05 30 15 0 05 15 90 25 0 15 0 667

1 50 15 01 2 25 150 30 0 30 0 667 52 19 05 1 04 025 10 4 38 100 9 26 04 5 1 67 05 05 01 01 10 3 33 1 180 80 09 1 04 0 25 11 4 100

% ppm C % % V % ppm C % % V x VCC V V mA V mA mA V V nA mV mV

RA RB e 1k to 100 kX C e 0 1 mF (Note 3)

VCC e 15V VCC e 5V

48 1 45 04

5 1 67 0 01 05 01 01

(Note 4) VCC e 15V VCC e 5V 96 29

10 3 33 1

VCC e 15V I7 e 15 mA VCC e 4 5V I7 e 4 5 mA

150 70

100

200

2

ElectricalCharacteristics TA e 25 C
Parameter Conditions

VCC e a 5V to a 15V (unless othewise specified) (Continued) Limits LM555 Min Typ 01 04 2 25 01 12 5 13 3 33 100 100 Max 0 15 05 22 Min LM555C Typ 01 04 2 25 Max 0 25 0 75 25 V V V V V V V V V ns ns Units

Output Voltage Drop (Low)

VCC e 15V ISINK e 10 mA ISINK e 50 mA ISINK e 100 mA ISINK e 200 mA VCC e 5V ISINK e 8 mA ISINK e 5 mA ISOURCE e 200 mA VCCe 15V ISOURCE e 100 mA VCC e 15V VCC e 5V 13 3

0 25 0 25 12 75 2 75 12 5 13 3 33 100 100 0 35

Output Voltage Drop (High)

Rise Time of Output Fall Time of Output

Note 1 For operating at elevated temperatures the device must be derated above 25 C based on a a 150 C maximum junction temperature and a thermal resistance of 164 c w (T0-5) 106 c w (DIP) and 170 c w (S0-8) junction to...