Lm55

July 2006
LM555
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 cycleare 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 sink200 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
00785101
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LM555 Timer
Connection Diagram
Dual-In-Line, Small Outline and Molded Mini Small Outline Packages
00785103
Top View
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
MUA08ALM555CMMX
Z55
3.5k Units Tape and Reel
8-Pin MDIP
LM555CN
LM555CN
Rails
N08E
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LM555
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
Soldering Information Dual-In-Line Package
Soldering (10 Seconds) Small Outline Packages(SOIC and MSOP) Vapor Phase (60 Seconds) Infrared (15 Seconds)
260 ̊C
215 ̊C
Supply Voltage Power Dissipation (Note 3)
LM555CM, LM555CN
LM555CMM Operating Temperature Ranges
LM555C Storage Temperature Range
+18V
1180 mW 613 mW
0 ̊C to +70 ̊C −65 ̊C to +150 ̊C
220 ̊C See AN-450 “Surface Mounting Methods and Their Effect
on Product Reliability” for other methods of soldering surface mountdevices.
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
VCC =5V,RL =∞ VCC =15V,RL =∞ (Low State) (Note 4)
3 10
6 15
mA
Timing Error, Monostable Initial Accuracy Drift with Temperature
Accuracy over Temperature Drift with Supply
RA = 1kto 100kΩ, C = 0.1μF, (Note 5)
1 50
1.5 0.1
% ppm/ ̊C
% %/V
Timing Error, Astable Initial Accuracy Drift with Temperature
Accuracy over Temperature Drift with Supply
RA, RB = 1k to 100kΩ, C = 0.1μF, (Note 5)
2.25 150
3.0 0.30
% ppm/ ̊C
% %/V
Threshold Voltage
0.667
x VCC
Trigger Voltage
VCC = 15V VCC = 5V
5 1.67
V V
Trigger Current
0.5
0.9
μA
Reset Voltage
0.4
0.5
1
VReset Current
0.1
0.4
mA
Threshold Current
(Note 6)
0.1
0.25
μA
Control Voltage Level
VCC = 15V VCC = 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 Output Low
VCC = 15V, I7 = 15mA VCC = 4.5V, I7 = 4.5mA
180 80
200
mV mV
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LM555
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)
VCC = 15V ISINK = 10mA ISINK = 50mA ISINK = 100mA ISINK = 200mA VCC = 5V ISINK = 8mA ISINK = 5mA
0.1 0.4 2 2.5
0.25
0.25 0.75 2.5
0.35
V V V V
V V
Output Voltage Drop (High)
ISOURCE = 200mA, VCC = 15V ISOURCE = 100mA, VCC = 15V VCC = 5V
12.75 2.75
12.5 13.3 3.3
V V V
Rise...