Part Number : SE555
Function : PRECISION TIMER
Package : DIP, SOP 8 Pin Type, PLCC 20 Pin Type
Maker : Texas Instruments
Pinouts : 
Description :
These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time-delay or monostable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the astable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor.
The threshold and trigger levels normally are two-thirds and one-third, respectively, of Vcc. These levels can be altered by use of the control-voltage terminal. When the trigger input falls below the trigger level, the flip-flop is set, and the output goes high. If the trigger input is above the trigger level and the threshold input is above the threshold level, the flip-flop is reset and the output is low.
Features
• Timing From Microseconds to Hours
• Astable or Monostable Operation
• Adjustable Duty Cycle
• TTL-Compatible Output Can Sink or Source up to 200 mA
Applications :
1. Fingerprint Biometrics
2. Iris Biometrics
3. RFID Reader
Official Homepage : https://www.ti.com/product/SE555
Datasheet PDF Download : 
Others datasheet of same file :
NA555, NA555D, NA555DG4, SE555DG4
