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MAX794：3.0V/3.3V Adjustable Microprocessor Supervisory Circuits

Full-Function Battery-Backup ICs for 3V/3.3V Systems

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 data sheet). 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 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 Battery Freshness Seal Battery OK Output (MAX793) Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning Independent Watchdog Timer (1.6s timeout) Manual Reset Input

MAX793, MAX793R, MAX793S, MAX793T, MAX794, MAX795, MAX795R, MAX795S, MAX795T: Typical Operating Circuit Applications/Uses Battery-Powered Computers/Controllers Critical µP Power Monitoring Embedded Controllers Intelligent Controllers Portable Equipment

DataSheet

Parametrics

Quality and Environmental Data

• MAX794.pdf

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• MAX800：Microprocessor Supervisory Circuits

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