LINEAR TECHNOLOGY LTC690/LTC691 LTC694/LTC695 handbook
LTC690/LTC691 and LTC694/LTC695 are chips used for power supply monitoring and battery control in microprocessor systems. They provide functions such as microprocessor reset, battery backup, CMOS RAM write protection, power failure warning, and watchdog timing. They have a precise internal voltage reference and comparator circuit. When an out-of-tolerance condition occurs in the power supply line, the reset outputs are forced to active states and the chip enable output unconditionally write-protects external memory. In addition, the LTC690 series also has a precise voltage monitoring function for power failure or low battery warning. It is an upgrade for the MAX690 series.
