MAX793 Datasheet | Maxim Integrated

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 es 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 parator Battery OK Output Watchdog Input Battery Freshness Seal Manual Reset Input Chip-Enable Gating Pin-Package MAX794 MAX795 16-DIP/SO 16-DIP/SO 8-DIP/SO ________________________Applications Battery-Powered puters and Controllers Embedded Controllers Intelligent Controllers Critical µP Power Monitoring Portable Equipment Pin Configurations appear at end of data sheet. ____________________________Features MAX793/MAX794/MAX795 o Precision Supply-Voltage Monitor: Fixed Reset Trip Voltage (MAX793/MAX795) Adjustable Reset Trip Voltage (MAX794) o Guaranteed Reset Assertion to VCC = 1V o Backup-Battery Power Switching- Battery Voltage Can Exceed VCC o On-Board Gating of Chip-Enable Signals- 7ns Max Propagation Delay MAX793/MAX794 Only o Battery Freshness Seal o Battery OK Output (MAX793) o Unmitted Voltage Monitor for Power-Fail or Low-Battery Warning o Independent Watchdog Timer (1.6s timeout) o Manual Reset Input Ordering Information PART-...