Transcript The 555 Integrated Circuit PowerPoint

The 555 Integrated Circuit
JIMMIE FOUTS
HOUSTON COUNTY CAREER ACADEMY
Most Successful Chip Ever!
 The 555 is probably the most successful chip made
 Introduced in 1971 by Signetics
 Extremely popular in numerous circuits!
 Over 1 billion are manufactured annually
 Very versatile
 Robust although still sensitive to excessive “static”
electricity
 Monolithic timing circuit
 Also available in low power CMOS versions
The 555 Chip Configuration
A small circular indention on the chip body identifies Pin 1.
Starting at top left (Pin 1) pins are numbered CCW
Static Sensitive
 Although robust, the 555, as with many other
integrated circuits can be damaged when you touch
them because your body may become charged with
static electricity, from your clothing for example
 Static sensitive ICs, especially CMOS, are supplied in
antistatic packaging with a warning label
 Limit handling of the pins
 It is usually adequate to earth ground your hands by
touching a metal water pipe or metal window frame
before handling
Physical Characteristics
NE555
 All integrated circuits require a power supply
 The 555 requires 4.5 to 16 VDC
 Temperature for operation 0 to 70 degrees C
 Typical trigger current .5 µA
 Typical rise/fall times 100 ns
 Output limited to about 200 ma
 Normally an 8 pin DIP
Potential Uses for the 555
 Monostable (one shot) Oscillator
 Astable Oscillator
 Pulse Width Modulator
 Linear Ramp
 50% Duty Cycle Oscillator
Another Configuration – The 556
The 556 is
actually a dual
555 timer
consisting of
two 555 timer
chips on one 14
pin integrated
circuit
Other
configurations
include three or
four 555 timer
chips within one
integrated circuit