SUPPLY VOLTAGE SUPERVISORS

The TL7700A series are monolithic supply voltage supervisor ICs specifically designed for use as rese controllers in microcomputer and Microprocessor systems. During power-up the device tests the sup- ply voltage and keeps the RESET and RESET out- puts active (high and low, respectively) as long as the supply voltage has not reached its nominal volt- age value. Taking RESIN low has the same effect. To ensure that the microcomputer system has reset, the TL7700A then initiates an internal time count that delays the return of the reset outputs to their in- active states. Since the time delay for most micro- computers and Microprocessors is in the order of several machine cycles, the device internal time de- lay is determined by an external capacitor con- nected to the CT input (pin 3). By STMicroelectronics