MAX793R, MAX793S, MAX793T: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
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
TitleDownload file
MAX793-MAX795T Data SheetMAX793-MAX795T.pdf
Parametrics
Part NumberReset Thresh.
(V)
Reset OutICC
(µA)
Oper. Temp.
(°C)
Package/PinsBudgetary
Price
maxSee Notes
MAX7932.5 to 3.3Active High
Active Low
Open Drain
Push-Pull
60-40 to +85
0 to +70
PDIP(N)/16
SOIC(N)/16
$4.46 @1k
MAX7941.2 to 1.8
1.8 to 2.5
2.5 to 3.3
3.3 to 5.5
Active High
Active Low
Open Drain
Push-Pull
60PDIP(N)/16
SOIC(N)/16
$4.32 @1k
MAX7952.5 to 3.3Active Low
Open Drain
50PDIP(N)/8
SOIC(N)/8
$3.73 @1k
Quality and Environmental Data
Related Products
  • MAX800:Microprocessor Supervisory Circuits
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX793RCPENo Longer AvailableMAX793RCPE+PDIP(N),;16 pin;158.4 mm²0°C to +70°CNo
MAX793RCPE+ActivePDIP(N),;16 pin;158.4 mm²0°C to +70°CLead Free
MAX793RCSENo Longer AvailableMAX793RCSE+SOIC(N),;16 pin;61.9 mm²0°C to +70°CNo
MAX793RCSE+ActiveSOIC(N),;16 pin;61.9 mm²0°C to +70°CLead Free
MAX793RCSE+TActiveSOIC(N),;16 pin;61.9 mm²0°C to +70°CLead Free
MAX793RCSE-TNo Longer AvailableMAX793RCSE+TSOIC(N),;16 pin;61.9 mm²0°C to +70°CNo
MAX793REPENo Longer AvailableMAX793REPE+PDIP(N),;16 pin;158.4 mm²-40°C to +85°CNo
MAX793REPE+ActivePDIP(N),;16 pin;158.4 mm²-40°C to +85°CLead Free
MAX793RESENo Longer AvailableMAX793RESE+SOIC(N),;16 pin;61.9 mm²-40°C to +85°CNo
MAX793RESE+ActiveSOIC(N),;16 pin;61.9 mm²-40°C to +85°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX793RESE+TActiveSOIC(N),;16 pin;61.9 mm²-40°C to +85°CLead Free
MAX793RESE-TNo Longer AvailableMAX793RESE+TN.SO;16 pin-40°C to +85°CSee data sheet
MAX793-MAX795T.pdf MAX795T
MAX793T.pdf MAX793T
MAX793-MAX795T.pdf MAX795T