Ci 555

INTEGRATED CIRCUITS

NE/SA/SE555/SE555C Timer
Product data Supersedes data of 1994 Aug 31 2003 Feb 14

Philips Semiconductors

Philips Semiconductors

Product data

Timer

NE/SA/SE555/SE555C

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.

PIN CONFIGURATION
D and N Packages
GND 1 TRIGGER 2 OUTPUT 3 RESET 4 8 7 6 5 VCC DISCHARGE THRESHOLD 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 of 0.005% per °C
APPLICATIONS

Figure 1. Pin configuration

BLOCK DIAGRAM
VCC 8

R 5 THRESHOLD 6
COMPARATOR

CONTROL VOLTAGE

R 2

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

COMPARATOR R

TRIGGER

7 DISCHARGE FLIP FLOP 4 RESET

OUTPUT STAGE

3 OUTPUT

1 GND

SL00350

Figure 2. Block Diagram

ORDERING INFORMATION
DESCRIPTION 8-Pin Plastic Small Outline (SO) Package 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Small Outline (SO) Package 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Dual In-Line Package (DIP) TEMPERATURE RANGE 0 to +70 °C 0 to +70 °C –40 °C to +85 °C –40 °C to +85 °C –55 °C to +125 °C –55 °C to +125 °C ORDER CODE NE555D NE555N SA555D SA555N SE555CN SE555N DWG # SOT96-1 SOT97-1