Datasheet 555

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 free running frequency and duty cycle areaccurately
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

Applications
Y
Y
Y

Features
Y
Y
Y

Y

Direct replacement for SE555 NE555
Timing from microseconds through hours
Operates in both astable and monostable modesAdjustable duty cycle
Output can source or sink 200 mA
Output and supply TTL compatible
Temperature stability better than 0 005% per C
Normally on and normally off output

Y
Y
Y

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

Schematic Diagram

TL H 7851 – 1

C1995 NationalSemiconductor Corporation

TL H 7851

RRD-B30M115 Printed in U S A

LM555 LM555C Timer

February 1995

Absolute Maximum Ratings
Storage Temperature Range

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
LM555LM555CN
Operating Temperature Ranges
LM555C
LM555

a 18V

260 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

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

Electrical Characteristics (TA e 25 C

b 65 C to a 150 C

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

VCC e a 5V to a 15V unless othewise specified)
Limits

Parameter

Conditions

LM555
Min

Supply Voltage
Supply Current

Timing Error Monostable
Initial Accuracy
Drift with Temperature

3
10

45

5
12

Typ

Units
Max
16

3
10

V

6
15

mA
mA

%
ppm C

15
01

%
%V

15
902 25
150

%
ppm C

25
0 15

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

1
50

15
0 05

Threshold Voltage

30
0 30

%
%V

0 667

x VCC

5
1 67

V
V

0 667
VCC e 15V
VCC e 5V

48
1 45
04

Reset Current
Threshold Current

(Note 4)

Control Voltage Level

VCC e 15V
VCC e 5V

52
19
05

05

1

01

Reset Voltage

5
1 67
0 01

TriggerCurrent

04

05

09

05

1

V

01

04

mA

01

04

mA

0 25

mA

10
3 33

11
4

V
V

01

2

10 4
38
100

1

100

nA

150
70

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

0 25

10
3 33
1

96
29

Pin 7 Leakage Output High
Pin 7 Sat (Note 5)
Output Low
Output Low

Min

05
30

RA e 1k to 100 kX
C e 0 1 mF (Note 3)Accuracy over Temperature
Drift with Supply
Trigger Voltage

LM555C
Max
18

45
VCC e 5V RL e %
VCC e 15V RL e %
(Low State) (Note 2)

Accuracy over Temperature
Drift with Supply
Timing Error Astable
Initial Accuracy
Drift with Temperature

Typ

100

180
80

200

mV
mV

9
26

Electrical Characteristics TA e 25 C

VCC e a 5V to a 15V (unless othewise specified)(Continued)
Limits

Parameter

Conditions

LM555
Min

Output Voltage Drop (Low)

Output Voltage Drop (High)

LM555C

Typ
01
04
2
25

Units

0 25

12 5
13 3
33

13
3

Min

Max

01
04
2
25

12 75
2 75

Typ

0 25
0 75
25

0 25

ISOURCE e 200 mA VCC e 15V
ISOURCE e 100 mA VCC e 15V
VCC e 5V

0 15
05
22

01

VCC e 15V
ISINK e 10 mA
ISINK e 50...