555 Introduction

The IC is just 8 pin  in line package, and includes 23-transistors, 2-diodes and 16resistors.

the other timer IC 556 is a 14 pin and includes  two 555 timers on a-single-chip.

also available are ultralow power types of the 555 timer.

The 555 timer has 2 operating modes:

in this mode the 555 functions as a "ONE - SHOT." applications include timers, missing pulse detection,touch switches, bouncearee switches,  and etc...

555 ASTABLE MODE:

in this mode 555 timer can operate as an oscillator.

it can bu used these functions:

build test versions of circuits on plastic solderless breadboard before making them parmanent. in monostable circuits where false triggering might couse problems, the pin 5 to ground via a 0,1 micro Farad capacitor. place a 0.1 micro farad capacitor accross pins 1 and 8 if power leads are long or if a circuit seems to_malfunction.

a 1 micro farad capacitor may alsobe necessary. be sure to experiment aith values of timing resistors and capacitors. the basic circuits on PP 6-7 explain the role these components play. remember that these 556 replace two 555's. low power versions of the 555 may require some revisions to standart 555 circuits.

Supply Voltage (Vcc) = 4.5 T0 15 V

Supply Current (Vcc=+5V))² = 3 T0 6 mA

Supply Current (Vcc=+15V))²= 10 T0 15 mA

Output Current = 200 mA (maximum)

Power Dissipation = 600mW

Operating Temperature= 0 - 70 C

¹= Values Shown apply to Ne555 (8 pin mini Dip)

²= Output Current =0