Fourier

NE555
SA555 - SE555

®

GENERAL PURPOSE SINGLE BIPOLAR TIMERS

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LOW TURN OFF TIME
MAXIMUM
OPERATING
FREQUENCY
GREATER THAN 500kHz
TIMING FROM MICROSECONDS TO HOURS
OPERATES IN BOTH ASTABLE AND
MONOSTABLE MODES
HIGH OUTPUT CURRENT CAN SOURCE OR
SINK 200mA
ADJUSTABLE DUTY CYCLE
TTL COMPATIBLE
TEMPERATURE STABILITY OF 0.005%
PERoC

DESCRIPTION
TheNE555 monolithic timing circuit is a highly stable
controller capable of producing accurate time delays
or oscillation. In the time delay mode of operation,
the time is precisely controlled by one external resistor and capacitor. For a stable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled with two external
resistors and one capacitor. Thecircuit may be triggered and reset on falling waveforms, and the output structure can source or sink up to 200mA. The
NE555 is available in plastic and ceramic minidip
package and in a 8-lead micropackage and in metal
can package version.

D
SO8
(Plastic Micropackage)

N
DIP8
(Plastic Package)

ORDER CODES
Part
Number

Package
N

D

0oC, 70oC

NE555

Temperature
Range•

•

SA555

–40 C, 105 C

•

•

SE555

–55oC, 125oC

•

•

o

o

PIN CONNECTIONS ( top view)

1
2

7

3

6

4

July 1998

8

5

1
2
3
4
5
6
7
8

-

GND
Trigger
Output
Reset
Control voltage
Threshold
Discharge
VCC

1/10

NE555/SA555/SE555
BLOCK DIAGRAM
VCC+

5kΩ
COMP
THRESHOLD
CONTROL VOLTAGE

DISCHARGE
R
FLIP-FLOP

Q5kΩ
COMP

OUT

TRIGGER

S
INHIBIT/
RESET
5kΩ

S

RESET

S - 8086

SCHEMATIC DIAGRAM
CONTROL
VOLTAGE

OUTPUT

THRESHOLD
COMPARATOR
5

VCC
R2
830W

R1
4.7kW

R3
4.7kW

R4 R8
1kW 5kW

R12
6.8kW
Q21

Q5

Q6

Q7

Q8

Q19

Q9

Q20

Q22
31R
3.9kW

R11
5kW
THRESHOLD

Q2

Q3

TRIGGER

2

Q23

R9
5kW

Q11 Q12

D2

RESET

4Q24

Q18

R16
100W

R15
4.7kW

Q15

7

Q17
Q14

GND

R14
220W

Q13

Q10

Q16

DISCHARGE

3

D1

R17
4.7kW

Q4

Q1

R5
10kW

R6
100kW

R7
100kW

R10
5kW

1

TRIGGER COMPARATOR

FLIP FLOP

ABSOLUTE MAXIMUM RATINGS
Symbol
Vcc
Toper

Tj
Tstg

2/10

Parameter

Value

Supply Voltage
Operating Free Air Temperature RangeJunction Temperature
Storage Temperature Range

18
for NE555
for SA555
for SE555

Unit
V

0 to 70
–40 to 105
–55 to 125

o

150

o

–65 to 150

o

C

C
C

NE555/SA555/SE555
OPERATING CONDITIONS
Symbol
VCC
Vth, Vtrig, Vcl, Vreset

Parameter

SE555
4.5 to 18

Maximum Input Voltage

4.5 to 18

V

VCC

Supply Voltage

NE555 - SA555

Unit

VCC

VELECTRICAL CHARACTERISTICS
Tamb = +25oC, VCC = +5V to +15V (unless otherwise specified)
Symbol

Parameter

SE555

NE555 - SA555

Vth

Ith
Vtrig

Itrig

Max.

3
10
2

0.5
30
0.05

Timing Error (astable)
(RA, RB = 1kΩ to 100kΩ, C = 0.1µF,
VCC = +15V)
Initial Accuracy - (note 2)
Drift with Temperature
Drift with Supply Voltage
VCL

Typ.

Timing Error (monostable)(RA = 2k to 100kΩ, C = 0.1µF)
Initial Accuracy - (note 2)
Drift with Temperature
Drift with Supply Voltage

ICC

Min.

1.5
90
0.15

Supply Current (RL ∞) (- note 1)
Low State
VCC = +5V
VCC = +15V
High State
VCC = 5V

Min.

Typ.

Max.

5
12

3
10
2

6
15

2
100
0.2

1
50
0.1

3

mA

0.5

2.25
150
0.3

V
9.6
2.9

10
3.33

10.4
3.8

92.6

10
3.33

11
4

Threshold Voltage
VCC = +15V
VCC = +5V

9.4
2.7

10
3.33

10.6
4

8.8
2.4

10
3.33

11.2
4.2

0.1

0.25

0.1

0.25

5
1.67

5.2
1.9

5
1.67

5.6
2.2

0.5

0.9

0.5

2.0

0.7

1

0.7

1

V

Threshold Current - (note 3)
Trigger Voltage
VCC = +15V
VCC = +5V
Reset Voltage - (note 4)

0.4

4.5
1.1...