Texas Instruments 555
The threshold and trigger levels normally are twothirds and one-third, respectively, of VCC. These levels can be altered by use of the control-voltage terminal.| Part No. | 555 |
|---|---|
| Datasheet | 555 Download |
| Manufacturer |  Texas Instruments |
| Description | Precision Timer |
| Buy | Stock & Price |
FEATURES
●1 Timing From Microseconds to Hours● Astable or Monostable Operation
● Adjustable Duty Cycle
● TTL-Compatible Output Can Sink or Source Up to 200 mA
● On Products Compliant to MIL-PRF-38535, All Parameters Are Tested Unless Otherwise Noted. On All Other Products, Production Processing Does Not Necessarily Include Testing of All Parameters. 2
APPLICATIONS
● Fingerprint Biometrics● Iris Biometrics
● RFID Reader 3
DESCRIPTION
These devices are precision timing circuits capable of producing accurate time delays or oscillation. In the time-delay or mono-stable mode of operation, the timed interval is controlled by a single external resistor and capacitor network. In the a-stable mode of operation, the frequency and duty cycle can be controlled independently with two external resistors and a single external capacitor. 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 flipflop is reset and the output is low.
