Timer
Dr. P. Sathya,
SENSE
, Timer
• The 555 timer is a highly stable device for generating accurate
time delay or oscillation.
• Signetics introduced this device: SE555/NE555
• Type of packages:
• 8 pin circular can style
• 8 pin mini DIP
• Double timer IC 556 - 14 pin DIP- 2 timers in one
• Counter timer 16 pin: XR2240 (555+ programmable binary
counter)
• 555 -Time delay: Ranging from microseconds to hours
• Counter timer delay: Timing range of days
, Pin Diagram
Vcc = 5 to 18V; IL = 200 mA