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UNISONIC TECHNOLOGIES CO., LTD
USA555
LINEAR INTEGRATED CIRCUIT
PRECISION TIMERS
DESCRIPTION
The UTC USA555 monolithic timing circuit is a highly stable controller 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.
USA555 Datasheet
