
Philips Semiconductors
Product data
NE/SA/SE555/SE555C
Timer
2
2003 Feb 14
DESCRIPTION
The 555 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. The circuit
may be triggered and reset on falling waveforms, and the output
structure can source or sink up to 200 mA.
FEATURES
Turn-off time less than 2 s
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 of 0.005% per °C
APPLICATIONS
Precision timing
Pulse generation
Sequential timing
Time delay generation
Pulse width modulation
PIN CONFIGURATION
1
2
3
45
6
7
8
GND
TRIGGER
OUTPUT
RESET
DISCHARGE
THRESHOLD
CONTROL VOLTAGE
VCC
D and N Packages
SL00349
Figure 1. Pin configuration
BLOCK DIAGRAM
COMPARATOR
FLIP FLOP
OUTPUT
STAGE
THRESHOLD
VCC
6
7
31
4
2
5
8
R
CONTROL
VOLTAGE
TRIGGER
RESET
DISCHARGE
OUTPUT
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