Ne555

NEwww.fairchildsemi.com

LM555/NE555/SA555
Single Timer
Features

Description
Description

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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 accuratelycontrolled by two external resistors and one capacitor.

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
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8-DIP

Precision Timing
Pulse Generation
Time Delay Generation
Sequential Timing

1

8-SOP

1

Internal Block Diagram

R

GND

Trigger

RR
8

Output

Reset

3

OutPut
Stage

Threshold

5

Comp.

Discharge

6

2

Vcc

7

1

Control
Voltage

Discharging Tr.

F/F

4

Vref

Comp.

Rev. 1.0.3
©2002 Fairchild Semiconductor Corporation

LM555/NE555/SA555

25
Absolute Maximum Ratings (TA = 25°C)
Parameter

Symbol

Value

Unit

VCC

16

V

TLEAD

300

°C

PD

600

mWOperating Temperature Range
LM555/NE555
SA555

TOPR

0 ~ +70
-40 ~ +85

°C

Storage Temperature Range

TSTG

-65 ~ +150

°C

Supply Voltage
Lead Temperature (Soldering 10sec)
Power Dissipation

2

LM555/NE555/SA555

Electrical Characteristics
(TA = 25°C, VCC = 5 ~ 15V, unless otherwise specified)
Parameter

Symbol

Conditions

Min.

Typ.

Max.

UnitSupply Voltage

VCC

-

4.5

-

16

V

Supply Current (Low Stable) (Note1)

ICC

VCC = 5V, RL = ∞

-

3

6

mA

VCC = 15V, RL = ∞

-

7.5

15

mA

ACCUR
∆t/∆T
∆t/∆VCC

RA = 1kΩ to100kΩ
C = 0.1µF

-

1.0
50
0.1

3.0

%
ppm/°C
%/V

ACCUR
∆t/∆T
∆t/∆VCC

RA = 1kΩ to 100kΩ
C = 0.1µF

-

2.25
150
0.3

-

%
ppm/°C
%/V

TimingError (Monostable)
Initial Accuracy (Note2)
Drift with Temperature (Note4)
Drift with Supply Voltage (Note4)
Timing Error (Astable)
Intial Accuracy (Note2)
Drift with Temperature (Note4)
Drift with Supply Voltage (Note4)

0.5

VCC = 15V

9.0

10.0

11.0

V

VCC = 5V

2.6

3.33

4.0

V

VCC = 15V

-

10.0

-

V

VCC = 5V

-

3.33

-

V

-

0.10.25

µA

VCC = 5V

1.1

1.67

2.2

V

VCC = 15V

4.5

Control Voltage

VC

Threshold Voltage

VTH

Threshold Current (Note3)

ITH

Trigger Voltage

VTR

Trigger Current

ITR

Reset Voltage

VRST

-

Reset Current

IRST

-

-

5.6

V

2.0

µA

0.7

1.0

V

0.1

0.4

5
0.01

VTR = 0V

0.4

mA

High Output Voltage

VOLVOH

-

0.06
0.3

0.25
0.75

V
V

VCC = 5V
ISINK = 5mA

Low Output Voltage

VCC = 15V
ISINK = 10mA
ISINK = 50mA

-

0.05

0.35

V

12.5
13.3

-

12.75

V
V

2.75

3.3

-

V

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

Rise Time of Output (Note4)

tR

-

-

100

-

ns

Fall Time of Output (Note4)

tF-

-

100

-

ns

Discharge Leakage Current

ILKG

-

-

20

100

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 = 20MΩ, and for 5V operation, the max.
total R = 6.7MΩ.
4. These parameters,although guaranteed, are not 100% tested in production.

3

LM555/NE555/SA555

Application Information
Table 1 below is the basic operating table of 555 timer:
Table 1. Basic Operating Table
Threshold Voltage
Trigger Voltage
Discharging Tr.
Reset(PIN 4)
Output(PIN 3)
(Vth)(PIN 6)
(Vtr)(PIN 2)
(PIN 7)
Don't care
Don't care
Low
Low
ON
Vth > 2Vcc / 3
High
Low
ON
Vth > 2Vcc /...