Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

LM555

SNAS548D – FEBRUARY 2000 – REVISED JANUARY 2015

LM555 Timer

1 Features

3 Description

The LM555 is a highly stable device for generating

1

•

Direct Replacement for SE555/NE555

accurate

time

delays

or

oscillation.

Additional

•

Timing from Microseconds through Hours

terminals are provided for triggering or resetting if

•

Operates in Both Astable and Monostable Modes

desired. In the time delay mode of operation, the time

is precisely controlled by one external resistor and

•

Adjustable Duty Cycle

capacitor. For a stable operation as an oscillator, the

•

Output Can Source or Sink 200 mA

free running frequency and duty cycle are accurately

•

Output and Supply TTL Compatible

controlled

with

two

external

resistors

and

one

capacitor. The circuit may be triggered and reset on

•

Temperature Stability Better than 0.005% per °C

falling waveforms, and the output circuit can source

•

Normally On and Normally Off Output

or sink up to 200 mA or drive TTL circuits.

•

Available in 8-pin VSSOP Package

Device Information(1)

2 Applications

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Precision Timing

SOIC (8)

4.90 mm × 3.91 mm

•

Pulse Generation

LM555

PDIP (8)

9.81 mm × 6.35 mm

VSSOP (8)

3.00 mm × 3.00 mm

•

Sequential Timing

•

Time Delay Generation

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

•

Pulse Width Modulation

•

Pulse Position Modulation

•

Linear Ramp Generator

Schematic Diagram

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.