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MAX793, MAX793R, MAX793S, MAX793T, MAX794, MAX795, MAX795R, MAX795S, MAX795T
3.0V/3.3V Adjustable Microprocessor Supervisory Circuits

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


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 324kB)
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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
  • Independent Watchdog Timer (1.6s timeout)
  • Manual Reset Input
  • Underwriters Laboratories (UL®) Recognized

 
  • Battery-Powered Computers/Controllers
  • Critical µP Power Monitoring
  • Embedded Controllers
  • Intelligent Controllers
  • Portable Equipment

    Key Specifications:  Battery Backup Circuits
    Part Number Reset Thresh.
    (V)
    Reset Out Reset Out ICC
    (µA)
    Features Package/Pins Smallest Available Pckg.
    (mm2)
    Oper. Temp.
    (°C)
    Price
    Active Low Active High max max w/pins See Notes
    MAX793  2.5 to 3.3 Open Drain Push-Pull 60
    Adjustable Reset Input
    Battery On
    Chip Enable Gate
    Low Line
    Manual Reset
    Power Fail Comparator
    Watchdog
    PDIP(N)/16
    SOIC(N)/16
    62
    -40 to +85
    0 to +70
    $3.48 @1k
    MAX794 
    1.2 to 1.8
    1.8 to 2.5
    2.5 to 3.3
    3.3 to 5.5
    Push-Pull 60
    Adjustable Reset Input
    Battery On
    Chip Enable Gate
    Low Line
    Manual Reset
    Power Fail Comparator
    Watchdog
    PDIP(N)/16
    SOIC(N)/16
    62 $3.48 @1k
    MAX795  2.5 to 3.3 - 50
    Battery On
    Chip Enable Gate
    PDIP(N)/8
    SOIC(N)/8
    31 $3.41 @1k
    See All Battery Backup Circuits (86)

    Diagram
    MAX793, MAX793R, MAX793S, MAX793T, MAX794, MAX795, MAX795R, MAX795S, MAX795T: Typical Operating Circuit
    Typical Operating Circuit

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    Document Ref.: 19-0366; Rev 5; 2007-03-20
    This page last modified: 2007-05-30


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