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Fairchild Semiconductor
Fairchild Semiconductor

LM555CN Datasheet

Single Timer


LM555CN Datasheet Preview


LM555/NE555/SA555
Single Timer
www.fairchildsemi.com
Features
• High Current Drive Capability (200mA)
• Adjustable Duty Cycle
• Temperature Stability of 0.005%/°C
• Timing From µSec to Hours
• Turn off Time Less Than 2µSec
Applications
• Precision Timing
• Pulse Generation
• Time Delay Generation
• Sequential Timing
Description
The LM555/NE555/SA555 is a highly stable controller
capable of producing accurate timing pulses. With a
monostable operation, the time delay is controlled by one
external resistor and one capacitor. With an astable
operation, the frequency and duty cycle are accurately
controlled by two external resistors and one capacitor.
8-DIP
1
8-SOP
1
Internal Block Diagram
GND 1
R
Trigger 2
Comp.
RR
8 Vcc
Discharging Tr.
7 Discharge
Output 3
OutPut
Stage
F/F
Reset 4
Vref
Comp.
6 Threshold
Control
5
Voltage
©2002 Fairchild Semiconductor Corporation
Rev. 1.0.3
Page 1

LM555/NE555/SA555
Absolute Maximum Ratings (TA = 25°C)
Parameter
Supply Voltage
Lead Temperature (Soldering 10sec)
Power Dissipation
Operating Temperature Range
LM555/NE555
SA555
Storage Temperature Range
Symbol
VCC
TLEAD
PD
TOPR
TSTG
Value
16
300
600
0 ~ +70
-40 ~ +85
-65 ~ +150
Unit
V
°C
mW
°C
°C
2
Page 2

LM555/NE555/SA555
Electrical Characteristics
(TA = 25°C, VCC = 5 ~ 15V, unless otherwise specified)
Parameter
Supply Voltage
Supply Current (Low Stable) (Note1)
Timing Error (Monostable)
Initial Accuracy (Note2)
Drift with Temperature (Note4)
Drift with Supply Voltage (Note4)
Symbol
VCC
ICC
Conditions
-
VCC = 5V, RL =
VCC = 15V, RL =
ACCUR
t/T
t/VCC
RA = 1kto100k
C = 0.1µF
Min. Typ. Max.
4.5 - 16
- 36
- 7.5 15
Unit
V
mA
mA
- 1.0 3.0
%
50 ppm/°C
0.1 0.5 %/V
Timing Error (Astable)
Intial Accuracy (Note2)
Drift with Temperature (Note4)
Drift with Supply Voltage (Note4)
Control Voltage
Threshold Voltage
Threshold Current (Note3)
Trigger Voltage
Trigger Current
Reset Voltage
Reset Current
Low Output Voltage
High Output Voltage
Rise Time of Output (Note4)
Fall Time of Output (Note4)
Discharge Leakage Current
ACCUR
t/T
t/VCC
VC
VTH
ITH
VTR
ITR
VRST
IRST
VOL
VOH
tR
tF
ILKG
RA = 1kto 100k
C = 0.1µF
VCC = 15V
VCC = 5V
VCC = 15V
VCC = 5V
-
VCC = 5V
VCC = 15V
VTR = 0V
-
-
VCC = 15V
ISINK = 10mA
ISINK = 50mA
VCC = 5V
ISINK = 5mA
VCC = 15V
ISOURCE = 200mA
ISOURCE = 100mA
VCC = 5V
ISOURCE = 100mA
-
-
-
- 2.25 -
%
150 ppm/°C
0.3 %/V
9.0 10.0 11.0
V
2.6 3.33 4.0
V
- 10.0 -
V
- 3.33 -
V
- 0.1 0.25 µA
1.1 1.67 2.2
V
4.5 5 5.6
V
0.01 2.0
µA
0.4 0.7 1.0
V
0.1 0.4
mA
- 0.06 0.25
0.3 0.75
- 0.05 0.35
V
V
V
12.5
12.75 13.3
2.75 3.3
- 100
- 100
- 20
-
-
-
-
100
V
V
V
ns
ns
nA
Notes:
1. When the output is high, the supply current is typically 1mA less than at VCC = 5V.
2. Tested at VCC = 5.0V and VCC = 15V.
3. This will determine the maximum value of RA + RB for 15V operation, the max. total R = 20M, and for 5V operation, the max.
total R = 6.7MΩ.
4. These parameters, although guaranteed, are not 100% tested in production.
3
Page 3

LM555/NE555/SA555
Application Information
Table 1 below is the basic operating table of 555 timer:
Table 1. Basic Operating Table
Threshold Voltage
(Vth)(PIN 6)
Trigger Voltage
(Vtr)(PIN 2)
Reset(PIN 4) Output(PIN 3)
Discharging Tr.
(PIN 7)
Don't care
Don't care
Low Low
ON
Vth > 2Vcc / 3
Vth > 2Vcc / 3
High
Low
ON
Vcc / 3 < Vth < 2 Vcc / 3 Vcc / 3 < Vth < 2 Vcc / 3
High
-
-
Vth < Vcc / 3
Vth < Vcc / 3
High
High
OFF
When the low signal input is applied to the reset terminal, the timer output remains low regardless of the threshold voltage or
the trigger voltage. Only when the high signal is applied to the reset terminal, the timer's output changes according to
threshold voltage and trigger voltage.
When the threshold voltage exceeds 2/3 of the supply voltage while the timer output is high, the timer's internal discharge Tr.
turns on, lowering the threshold voltage to below 1/3 of the supply voltage. During this time, the timer output is maintained
low. Later, if a low signal is applied to the trigger voltage so that it becomes 1/3 of the supply voltage, the timer's internal
discharge Tr. turns off, increasing the threshold voltage and driving the timer output again at high.
1. Monostable Operation
Trigger
RL
4
RESET
2 TRIG
8
Vcc
DISCH 7
THRES 6
3 OUT
GND
1
CONT 5
+Vcc
RA
C1
C2
Figure 1. Monoatable Circuit
102
101
100
10-1
10-2
10-3
10-5 10-4 10-3 10-2 10-1 100 101 102
Time Delay(s)
Figure 2. Resistance and Capacitance vs.
Time delay(td)
Figure 3. Waveforms of Monostable Operation
4
Page 4
Part Number LM555CN
Manufactur Fairchild Semiconductor
Description Single Timer
Total Page 14 Pages
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LM555CN datasheet
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