MAX793

19-0366; Rev 6; 3/10 MAX793/MAX794/MAX795 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits General Description The MAX793/MAX794/MAX795 microprocessor (µP) supervisory circuits monitor and control the activities of +3.0V/+3.3V µPs by providing backup-battery switchover, among other features such as low-line indication, µP reset, write protection for CMOS RAM, and a watchdog (see the Selector Guide below). The backup-battery voltage can exceed VCC, permitting the use of 3.6V lithium batteries in systems using 3.0V to 3.3V for VCC. The MAX793/MAX795 offer a choice of reset threshold voltage range (denoted by suffix letter): 3.00V to 3.15V (T), 2.85V to 3.00V (S), and 2.55V to 2.70V (R). The MAX794’s reset threshold is set externally with a resistor divider. The MAX793/MAX794 are available in 16-pin DIP and narrow SO packages, and the MAX795 comes in 8-pin DIP and SO packages. _____________________Selector Guide FEATURE Active-Low Reset Active-High Reset Programmable Reset Threshold Low-Line Early Warning Output Backup-Battery Switchover External Switch Driver Power-Fail Comparator Battery OK Output Watchdog Input Battery Freshness Seal Manual Reset Input Chip-Enable Gating Pin-Package MAX793   MAX794   MAX795            16-DIP/SO 16-DIP/SO   8-DIP/SO ________________________Applications Battery-Powered Computers and Controllers Embedded Controllers Intelligent Controllers Critical µP Power Monitoring Portable Equipment Pin Config...