LM555C Datasheet PDF - National Semiconductor


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LM555C
National Semiconductor

Part Number LM555C
Description Timer
Page 10 Pages

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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 oscilla-
tor the free running 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
Features
Y Direct replacement for SE555 NE555
Y Timing from microseconds through hours
Y Operates in both astable and monostable modes
Y Adjustable duty cycle
Y Output can source or sink 200 mA
Y Output and supply TTL compatible
Y Temperature stability better than 0 005% per C
Y Normally on and normally off output
Applications
Y Precision timing
Y Pulse generation
Y Sequential timing
Y Time delay generation
Y Pulse width modulation
Y Pulse position modulation
Y Linear ramp generator
Schematic Diagram
C1995 National Semiconductor Corporation TL H 7851
TL H 7851 – 1
RRD-B30M115 Printed in U S A



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Absolute Maximum Ratings
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
a18V
Power Dissipation (Note 1)
LM555H LM555CH
LM555 LM555CN
760 mW
1180 mW
Operating Temperature Ranges
LM555C
LM555
0 C to a70 C
b55 C to a 125 C
Storage Temperature Range
b65 C to a150 C
Soldering Information
Dual-In-Line Package
Soldering (10 Seconds)
Small Outline Package
Vapor Phase (60 Seconds)
Infrared (15 Seconds)
260 C
215 C
220 C
See AN-450 ‘‘Surface Mounting Methods and Their Effect
on Product Reliability’’ for other methods of soldering sur-
face mount devices
Electrical Characteristics (TA e 25 C VCC e a5V to a15V unless othewise specified)
Limits
Parameter
Conditions
LM555
LM555C
Min Typ Max Min Typ Max
Supply Voltage
4 5 18 4 5 16
Supply Current
VCC e 5V RL e %
VCC e 15V RL e %
(Low State) (Note 2)
35
10 12
36
10 15
Timing Error Monostable
Initial Accuracy
Drift with Temperature
Accuracy over Temperature
Drift with Supply
RA e 1k to 100 kX
C e 0 1 mF (Note 3)
05
30
15
0 05
1
50
15
01
Timing Error Astable
Initial Accuracy
Drift with Temperature
Accuracy over Temperature
Drift with Supply
RA RB e 1k to 100 kX
C e 0 1 mF (Note 3)
15
90
25
0 15
2 25
150
30
0 30
Threshold Voltage
0 667
0 667
Trigger Voltage
Trigger Current
VCC e 15V
VCC e 5V
48 5
1 45 1 67
0 01
52
19
05
5
1 67
05 09
Reset Voltage
04 05
1 04 05
1
Reset Current
01 04
01 04
Threshold Current
(Note 4)
0 1 0 25
0 1 0 25
Control Voltage Level
Pin 7 Leakage Output High
VCC e 15V
VCC e 5V
9 6 10 10 4 9 10 11
2 9 3 33 3 8 2 6 3 33
4
1 100
1 100
Pin 7 Sat (Note 5)
Output Low
Output Low
VCC e 15V I7 e 15 mA
VCC e 4 5V I7 e 4 5 mA
150
70 100
180
80 200
Units
V
mA
mA
%
ppm C
%
%V
%
ppm C
%
%V
x VCC
V
V
mA
V
mA
mA
V
V
nA
mV
mV
2



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Electrical Characteristics TA e 25 C VCC e a5V to a15V (unless othewise specified) (Continued)
Limits
Parameter
Conditions
LM555
LM555C
Units
Min Typ Max Min Typ Max
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
0 1 0 15
04 05
2 22
25
0 1 0 25
0 1 0 25
0 4 0 75
2 25
25
0 25 0 35
Output Voltage Drop (High) ISOURCE e 200 mA VCC e 15V
12 5
ISOURCE e 100 mA VCC e 15V 13 13 3
VCC e 5V
3 33
12 75
2 75
12 5
13 3
33
Rise Time of Output
100 100
V
V
V
V
V
V
V
V
V
ns
Fall Time of Output
100 100 ns
Note 1 For operating at elevated temperatures the device must be derated above 25 C based on a a150 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 ambient
Note 2 Supply current when output high typically 1 mA less at VCC e 5V
Note 3 Tested at VCC e 5V and VCC e 15V
Note 4 This will determine the maximum value of RA a RB for 15V operation The maximum total (RA a RB) is 20 MX
Note 5 No protection against excessive pin 7 current is necessary providing the package dissipation rating will not be exceeded
Note 6 Refer to RETS555X drawing of military LM555H and LM555J versions for specifications
Connection Diagrams
Metal Can Package
Dual-In-Line and Small Outline Packages
Top View
TL H 7851 – 2
Order Number LM555H or LM555CH
See NS Package Number H08C
Top View
TL H 7851 – 3
Order Number LM555J LM555CJ
LM555CM or LM555CN
See NS Package Number J08A M08A or N08E
3



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Typical Performance Characteristics
Minimuim Pulse Width
Required for Triggering
Supply Current vs
Supply Voltage
High Output Voltage vs
Output Source Current
Low Output Voltage vs
Output Sink Current
Low Output Voltage vs
Output Sink Current
Low Output Voltage vs
Output Sink Current
Output Propagation Delay vs
Voltage Level of Trigger Pulse
Output Propagation Delay vs
Voltage Level of Trigger Pulse
Discharge Transistor (Pin 7)
Voltage vs Sink Current
Discharge Transistor (Pin 7)
Voltage vs Sink Current
TL H 7851 – 4
4




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