Page 15 - Template EBook Kita (A4 Document)

TOPIC 1: INTRODUCTION TO 555 TIMER

PIN ASSIGNMENTS

pin 1 Connects to the 0V power

supply.

GROUND

• This pin is an inverting input to a comparator 2 pin 2

that is responsible for transition of flip-flop from

set to reset. TRIGGER
• The output of the timer depends on the

amplitude of the external trigger pulse applied to

this pin.
• When < 1/3 Vcc ('active low') this makes the

output high (+Vcc).

pin 3

OUTPUT Output of the timer.

08