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MAX794
Power Voltage Supervisors MAX794
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MAX794

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3.0V/3.3V Adjustable Microprocessor Supervisory Circuits

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

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Product Details

See parametric specs for Battery Backup Circuits

Key Features

See parametric specs for Battery Backup Circuits
Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Out Active High
Active Low
Open Drain
Push-Pull
ICC (µA) (max) 60
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP/16
SOIC (N)/16
Budgetary
Price (See Notes) 		4.81
See parametric specs for Battery Backup Circuits
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Simplified Block Diagram

Technical Docs

Data Sheet 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits Mar 29, 2010

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Parameters

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 1.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Reset Out Active High
Active Low
Open Drain
Push-Pull
ICC (µA) (max) 60
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP/16
SOIC (N)/16
Budgetary
Price (See Notes) 		4.81
See parametric specs for Battery Backup Circuits

Key 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 (1.6s timeout)
  • Manual Reset Input

Applications/Uses

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

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 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.

Simplified Block Diagram

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

Technical Docs

Data Sheet 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits Mar 29, 2010

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .