Product Description
Precision timerDESCRIPTIONThese 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.
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.
The reset (RESET) input can override all other inputs and can be used to initiate a new timing cycle.
When RESET goes low, the flip-flop is reset, and the output goes low.
When the output is low, a low-impedance path is provided between discharge (DISCH) and ground.
The output circuit is capable of sinking or sourcing current up to 200 mA.
Operation is specified for supplies of 5 V to 15 V.
With a 5-V supply, output levels are compatible with TTL inputs.
Features:• 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.
Applications• Fingerprint Biometrics• Iris Biometrics• RFID Reader
