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.

FEATUREs
MAX793/MAX794/MAX795
♦ Precision Supply-Voltage Monitor:
   Fixed Reset Trip Voltage (MAX793/MAX795)
   Adjustable Reset Trip Voltage (MAX794)
♦ Guaranteed Reset Assertion to VCC = 1V
♦ Backup-Battery Power Switching—Battery Voltage Can Exceed VCC
♦ On-Board Gating of Chip-Enable Signals—7ns
   Max Propagation Delay
   MAX793/MAX794 Only
♦ Battery Freshness Seal
♦ Battery OK Output (MAX793)
♦ Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning
♦ Independent Watchdog Timer (1.6sec timeout)
♦ Manual Reset Input

APPLICATIONs
   Battery-Powered Computers and Controllers
   Embedded Controllers
   Intelligent Controllers
   Critical µP Power Monitoring
   Portable Equipment