NSC LM555J-883, LM555H-883, LM555H-MLS, LM555CMX, LM555CMMX Datasheet
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LM555
Timer
General Description
The LM555 is a highly stable device for generating accurate
time delays or oscillation. Additional terminals are provided
for triggeringor 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 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 200mA or drive
TTL circuits.
Features
n Direct replacement for SE555/NE555
n Timing from microseconds through hours
n Operates in both astable and monostable modes
n Adjustable duty cycle
n Output can source or sink 200 mA
n Output and supply TTL compatible
n Temperature stability better than 0.005% per ˚C
n Normally on and normally off output
n Available in 8-pin MSOP package
Applications
n Precision timing
n Pulse generation
n Sequential timing
n Time delay generation
n Pulse width modulation
n Pulse position modulation
n Linear ramp generator
Schematic Diagram
DS007851-1
February 2000
LM555 Timer
© 2000 National Semiconductor Corporation DS007851 www.national.com
Connection Diagram
Ordering Information
Package Part Number Package Marking Media Transport NSC Drawing
8-Pin SOIC LM555CM LM555CM Rails
M08A
LM555CMX LM555CM 2.5k Units Tape and Reel
8-Pin MSOP LM555CMM Z55 1k Units Tape and Reel
MUA08A
LM555CMMX Z55 3.5k Units Tape and Reel
8-Pin MDIP LM555CN LM555CN Rails N08E
Dual-In-Line, Small Outline
and Molded Mini Small Outline Packages
DS007851-3
Top View
LM555
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Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage +18V
Power Dissipation (Note 3)
LM555CM, LM555CN 1180 mW
LM555CMM 613 mW
Operating Temperature Ranges
LM555C 0˚C to +70˚C
Storage Temperature Range −65˚C to +150˚C
Soldering Information
Dual-In-Line Package
Soldering (10 Seconds) 260˚C
Small Outline Packages
(SOIC and MSOP)
Vapor Phase (60 Seconds) 215˚C
Infrared (15 Seconds) 220˚C
See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering
surface mount devices.
Electrical Characteristics (Notes 1, 2)
(TA= 25˚C, VCC= +5V to +15V, unless othewise specified)
Parameter Conditions Limits Units
LM555C
Min Typ Max
Supply Voltage 4.5 16 V
Supply Current V
CC
= 5V, RL=
∞
VCC= 15V, RL=
∞
(Low State) (Note 4)
3
10
6
15 mA
Timing Error, Monostable
Initial Accuracy 1%
Drift with Temperature R
A
= 1k to 100kΩ, 50 ppm/˚C
C = 0.1µF, (Note 5)
Accuracy over Temperature 1.5 %
Drift with Supply 0.1 %/V
Timing Error, Astable
Initial Accuracy 2.25 %
Drift with Temperature R
A,RB
= 1k to 100kΩ, 150 ppm/˚C
C = 0.1µF, (Note 5)
Accuracy over Temperature 3.0 %
Drift with Supply 0.30 %/V
Threshold Voltage 0.667 x V
CC
Trigger Voltage VCC= 15V 5 V
V
CC
= 5V 1.67 V
Trigger Current 0.5 0.9 µA
Reset Voltage 0.4 0.5 1 V
Reset Current 0.1 0.4 mA
Threshold Current (Note 6) 0.1 0.25 µA
Control Voltage Level V
CC
= 15V
V
CC
=5V
9
2.6
10
3.33
11
4
V
Pin 7 Leakage Output High 1 100 nA
Pin 7 Sat (Note 7)
Output Low V
CC
= 15V, I7= 15mA 180 mV
Output Low V
CC
= 4.5V, I7= 4.5mA 80 200 mV
LM555
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Electrical Characteristics (Notes 1, 2) (Continued)
(TA= 25˚C, VCC= +5V to +15V, unless othewise specified)
Parameter Conditions Limits Units
LM555C
Min Typ Max
Output Voltage Drop (Low) V
CC
= 15V
I
SINK
= 10mA 0.1 0.25 V
I
SINK
= 50mA 0.4 0.75 V
I
SINK
= 100mA 2 2.5 V
I
SINK
= 200mA 2.5 V
V
CC
=5V
I
SINK
= 8mA V
I
SINK
= 5mA 0.25 0.35 V
Output Voltage Drop (High) I
SOURCE
= 200mA, VCC= 15V 12.5 V
I
SOURCE
= 100mA, VCC= 15V 12.75 13.3 V
V
CC
= 5V 2.75 3.3 V
Rise Time of Output 100 ns
Fall Time of Output 100 ns
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevice may occur.OperatingRatingsindicateconditionsforwhichthedeviceisfunc-
tional, but do not guarantee specific performance limits. Electrical Characteristics state DC andACelectricalspecificationsunderparticulartestconditionswhichguarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is
given, however, the typical value is a good indication of device performance.
Note 3: Foroperatingatelevatedtemperatures the device must be derated above 25˚C based on a +150˚C maximum junction temperature and a thermal resistance
of 106˚C/W (DIP), 170˚C/W (S0-8), and 204˚C/W (MSOP) junction to ambient.
Note 4: Supply current when output high typically 1 mA less at V
CC
=5V.
Note 5: Tested at V
CC
= 5V and VCC= 15V.
Note 6: This will determine the maximum value of R
A+RB
for 15V operation. The maximum total (RA+RB)is20MΩ.
Note 7: No protection against excessive pin 7 current is necessary providing the package dissipation rating will not be exceeded.
Note 8: Refer to RETS555X drawing of military LM555H and LM555J versions for specifications.
LM555
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