ST SA555, SE555 User Manual

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Features

■ 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% per °C

Description

NE555

SA555 - SE555

General purpose single bipolar timers

N

DIP8

(Plastic package)

D

SO8

(Plastic micropackage)

The NE555 monolithic timing circuit is a highly stable controller capab le 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.

The circuit may be triggered and reset on falling wav eforms, and the output structure can source or sink up to 200mA.

Pin connections

(top view)

1 - GND 2 - Trigger 3 - Output 4 - Reset

5 - Control voltage 6 - Threshold 7 - Discharge 8 - V

CC

March 2007 Rev 4 1/20

www.st.com

20

Contents NE555 - SA555 - SE555

Contents

1 Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.1 Monostable operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4.2 Astable operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

4.3 Pulse width modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.4 Linear ramp . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4.5 50% duty cycle oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.6 Additional information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

2/20

NE555 - SA555 - SE555 Schematic diagrams

T

1 Schematic diagrams

Figure 1. Block diagram

+

V

CC

5kΩ

THRESHOLD

CONTROL VOLTAGE

TRIGGER

COMP

5kΩ

COMP

5kΩ

R FLIP-FLOP

S

INHIBIT/ RESET

Q

DISCHARGE

OUT

Figure 2. Schematic diagram

THRESHOLD

COMPARATOR

V

HRESHOLD

TRIGGER

RESET

DISCHARGE

G N D

CC

R1

4.7k

Q5 Q6 Q7 Q8 Q9

Q1

Q2

2

4

Q15

7

Q14

1

R2

R3

830

W

Q3

R5

10k

4.7k

Q4

Q10

W

RESET

W

R6

100k

Q11 Q12

W

S - 8086

R4

1k

W

Q13

100k

S

CONTROL VOLTAGE

5

R8

5k

W

Q19

R11 5k

W

R9

5k

W

R7

W

D2

Q16 Q18

Q17

R10 5k

W

4.7k

R17

R12

6.8k

W

Q20

W

Q23

R16

100

Q21

OUTPUT

Q22

R13

3.9k

W

D1

R14

220

R15

4.7k

W

3

W

Q24

W

TRIGGER COMPARATOR FLIP FLOP

3/20

Absolute maximum ratings and operating conditions NE555 - SA555 - SE555

2 Absolute maximum ratings and operating conditions

Table 1. Absolute maximum ratings

Symbol Parameter Value Unit

V

CC

T

j

T

stg

Table 2. Operating conditions

Supply voltage 18 V Junction temperature 150 °C Storage temperature range -65 to 150 °C

Symbol Parameter Value Unit

Supply voltage

Vth, V

V

trig

CC

, Vcl, V

NE555 SA555 SE555

Maximum input voltage V

reset

4.5 to 16

4.5 to 18

CC

Operating free air temperature range

T

oper

NE555 SA555 SE555

0 to 70

-40 to 105

-55 to 125

V

°C

4/20

NE555 - SA555 - SE555 Electrical characteristics

3 Electrical characteristics

Table 3. T

= +25°C, VCC = +5V to +15V (unless otherwise specified)

amb

Symbol Parameter

Supply current (RL = ∝)

I

Low stage V

CC

High state V

= +5V

CC

VCC = +15V

= 5V

CC

Timing error (monostable) (R

= 2k to 100kΩ, C = 0.1μF)

A

Initial accuracy

(1)

Drift with temperature Drift with supply voltage

Timing error (astable) (R

= 1kΩ to 100kΩ, C = 0.1μF, VCC = +15V)

A, RB

Initial accuracy -

(1)

Drift with temperature Drift with supply voltage

Control voltage level

V

CL

VCC = +15V

= +5V

V

CC

Threshold voltage

V

th

V

CC

= +15V

VCC = +5V

Threshold current

I

th

(2)

Trigger voltage

V

I

trig

reset

trig

VCC = +15V

= +5V

V

CC

Trigger current (V Reset voltage

(3)

= 0V) 0.5 0.9 0.5 2.0 µA

trig

Reset current

I

reset

V V

reset reset

= +0.4V = 0V

Low level output voltage

= +15VI

V

CC

V

OL

VCC = +5V I

O(sink)

I

O(sink)

I

O(sink)

I

O(sink) O(sink)

I

O(sink)

= 10mA = 50mA = 100mA = 200mA = 8mA = 5mA

High level output voltage

V

= +15VI

V

OH

CC

V

CC

= +5V I

O(sink)

I

O(sink) O(sink)

= 200mA = 100mA = 100mA

SE555 NE555 - SA555

Min. Typ. Max. Min. Typ. Max.

3

10

2

0.5 30

0.05

1.5 90

0.15

9.6

2.9103.33

9.4

2.7103.33

5

12

3

10

2

100

0.2

1

50

0.130.5

2.25 150

0.3

10.4

3.892.6103.33114

10.648.8

2.4103.33

6

15

ppm/°C

11.2

4.2

0.1 0.25 0.1 0.25 µA

4.8

1.4551.67

5.2

1.9

4.5

1.151.67

5.6

2.2

0.4 0.7 1 0.4 0.7 1 V

13

0.1

0.4

0.1

0.4

2.5

0.1

0.05

12.5

13.3

3

3.3

0.4 1

0.15

0.5

2

2.2

0.1

0.4

0.1

0.4 2

0.4

1.5

0.25

0.75

2.5

0.25

0.2

0.3

0.25

0.4

0.35

12.5

12.75

2.75

13.3

3.3

Unit

mA

%

%/V

%

%/V

V

mA

V

5/20

Electrical characteristics NE555 - SA555 - SE555

Table 3. T

= +25°C, VCC = +5V to +15V (unless otherwise specified)

amb

SE555 NE555 - SA555

Symbol Parameter

Min. Typ. Max. Min. Typ. Max.

I

dis(off)

V

dis(sat)

t

1. Tested at VCC = +5V and VCC = +15V.

2. This will determine the maximum value of R operation and 3.5MΩ for +5V operation.

3. Specified with trigger input high.

4. No protection against excessive pin 7 current is necessary, providing the package dissipation rating is not exceeded.

5. Time measured from a positive pulse (from 0V to 0.8xV Output pin. Trigger is tied to Threshold.

Discharge pin leakage current (output high) V

Discharge pin saturation voltage (output low)

VCC = +15V, I VCC = +5V, I

t

Output rise time

r

t

Output fall time

f

Turn off time

off

(4)

(5)

dis

(V

= 10V

= 15mA

= 4.5mA

= VCC)0.50.5µs

reset

+ RB for 15V operation. The maximum total (RA + RB) is 20MΩ for 15V

A

) on the Threshold pin to the transition from high to low on the

CC

20 100 20 100 nA

18080480

200

100 100

200 200

18080480

200

100 100

300 300

Unit

mV

ns

6/20

ST SA555, SE555 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual