TL7700AC

The TL7700A series aremonolithicintegratedcircuit supplyvoltagesupervisorsspecificallydesi-gnedfor use as reset controllers in microcomputer and microprocessor systems. During power-up the device tests the supply voltage and keeps theRESET and RESET outputs active (high and low, respectively) as long as the supply voltage has not reached its nominal voltage value. Taking TL7700A series RESIN low has the same effect.To ensurethat themicrocomputersys-temhasreset, the TL7700A then initiatesaninternal time delaythat delays the returnof the resetoutputs to their inactivestates.Since the timedelay formost microcomputersandmicroprocessorsis in theorder of several machine cycles, the device TL7700A series internal time delayis determinedby an external time delay is determined by an external capacitor connected to the C_T input (pin 3).

t_d = 1.3 x 10⁴ xC_T

Where : C_T is in farads (F) and t_d in seconds (s). In addition, when the supply voltage drops below the nominal value, the outputs will be active until the supply voltage returns to the nominal value. An externalcapacitor(typically0.1µF)mustbeconnected to theREF output (pin 1) to reduce the influence of fast transients in the supply voltage.

The TL7700AI series is characterized for operation from 25^oC to 85^oC ; theTL7700AC series is characterized from 0^oC to 70^oC.