555 Timer IC

Astable Operation (Operates like an oscillator)

Mono-stable Operation (One shot)

T = 1.1 RC

Notes:

1. Tie Reset to Vcc unless you need to reset the output

References: http://www.electronics-tutorials.com/devices/555.htm

http://www.williamson-labs.com/555-tutorial.htm

+

-

+

-

Q

Qbar

Set

Rst

RB

VA

VB

41 (Gnd)

2

3

6

5

7

8

Astable Operation Configuration

Philips NE555 and NE556 applications note AN 170

Philips NE555 and NE556 applications note AN 170