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 in the full datasheet). 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.
Key Features
Applications/Uses
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
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