Datasheet 555

INTEGRATED CIRCUITS

NE/SA/SE555/SE555C
Timer
Product data
Supersedes data of 1994 Aug 31

Philips
Semiconductors

2003 Feb 14

Philips Semiconductors

Product data

Timer

NE/SA/SE555/SE555C

DESCRIPTION

PIN CONFIGURATION

The 555 monolithic timing circuit is a highly stable controller capable
of producing accurate time delays, or oscillation. In the time delay
modeof 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 waveforms, and the output
structure can source or sink up to 200 mA.

D and N Packages
GND1

8

VCC

TRIGGER 2

7

DISCHARGE

OUTPUT 3

6

THRESHOLD

RESET 4

5

CONTROL VOLTAGE

SL00349

FEATURES

• Turn-off time less than 2 µs
• Max. operating frequency greater than 500 kHz
• Timing from microseconds to hours
• Operates in both astable and monostable modes
• High output current
• Adjustable duty cycle
• TTL compatible
• Temperature stability of0.005% per °C

Figure 1. Pin configuration

BLOCK DIAGRAM
VCC
8

R
5
THRESHOLD

6

CONTROL
VOLTAGE

COMPARATOR

R

APPLICATIONS

• Precision timing
• Pulse generation
• Sequential timing
• Time delay generation
• Pulse width modulation

COMPARATOR

2

TRIGGER

R

7
DISCHARGE
4

FLIP FLOP

RESET

OUTPUT
STAGE

3
OUTPUT

1
GND

SL00350

Figure 2.Block Diagram

ORDERING INFORMATION
DESCRIPTION

TEMPERATURE RANGE

ORDER CODE

DWG #

8-Pin Plastic Small Outline (SO) Package

0 to +70 °C

NE555D

SOT96-1

8-Pin Plastic Dual In-Line Package (DIP)

0 to +70 °C

NE555N

SOT97-1

8-Pin Plastic Small Outline (SO) Package

–40 °C to +85 °C

SA555D

SOT96-1

8-Pin Plastic Dual In-Line Package (DIP)

–40 °C to +85°C

SA555N

SOT97-1

8-Pin Plastic Dual In-Line Package (DIP)

–55 °C to +125 °C

SE555CN

SOT97-1

8-Pin Plastic Dual In-Line Package (DIP)

–55 °C to +125 °C

SE555N

SOT97-1

2003 Feb 14

2

Philips Semiconductors

Product data

Timer

NE/SA/SE555/SE555C

EQUIVALENT SCHEMATIC
FM
CONTROL VOLTAGE
VCC
R1
4.7 kΩ

R2
330 Ω

R3
4.7 kΩ

R4
1 kΩ

R7
5kΩ

R12
6.8
kΩ
Q21

Q6

Q5

Q7

Q9
Q22
Q8

THRESHOLD

Q1

Q19

R10
82 kΩ

Q4
Q2

R13
3.9 kΩ

OUTPUT

Q3
Q23
C
R8
5 kΩ

R5
10 kΩ

CB
Q18
E

R11
4.7 kΩ

Q10

Q17

Q13
Q16

Q25

DISCHARGE
Q14
GND

NOTE:

Q20

Q11 Q12

TRIGGER
RESET

B

R14
220 Ω
Q24

Q15
R9
5 kΩ

R6
100 kΩ

R15
4.7 kΩ

R16
100 Ω

Pin numbersare for 8-Pin package

SL00351

Figure 3. Equivalent schematic

ABSOLUTE MAXIMUM RATINGS
SYMBOL

PARAMETER

RATING

UNIT

VCC

Supply voltage
SE555
NE555, SE555C, SA555

+18
+16

V
V

PD

Maximum allowable power dissipation1

600

mW

Tamb
amb

Operating ambient temperature range
NE555
SA555
SE555, SE555C

0 to +70
–40 to +85
–55 to +125

°C
°C
°CTstg

Storage temperature range

–65 to +150

°C

TSOLD

Lead soldering temperature (10 sec max)

+230

°C

NOTE:
1. The junction temperature must be kept below 125 °C for the D package and below 150°C for the N package.
At ambient temperatures above 25 °C, where this limit would be derated by the following factors:
D package 160 °C/W
N package 100 °C/W

2003 Feb 14

3Philips Semiconductors

Product data

Timer

NE/SA/SE555/SE555C

DC AND AC ELECTRICAL CHARACTERISTICS
Tamb = 25 °C, VCC = +5 V to +15 V unless otherwise specified.
SYMBOL

PARAMETER

TEST CONDITIONS
CONDITIONS

VCC

Supply voltage

ICC

Supply current (low state)1
current (low state)

tM
∆tM/∆T
∆tM/∆VS

Timing error (monostable)
Initial accuracy2
Drift with...