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MAX805L

MAX805L

Microprocessor Supervisory Circuits

Industry-Standard, Full-Function uP Supervisor

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Overview

Description

The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.

These parts provide four functions:
1) A reset output during power-up, power-down, and brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS µP, or other low-power logic.
3) A reset pulse if the optional watchdog timer has not been toggled within 1.6sec.
4) A 1.25V threshold detector for power-fail warning or low-battery detection, or to monitor a power supply other than +5V.

The parts differ in their reset-voltage threshold levels and reset outputs. The MAX690A/MAX802L/MAX805L generate a reset pulse when the supply voltage drops below 4.65V, and the MAX692A/MAX802M generate a reset below 4.40V. The MAX802L/MAX802M guarantee power-fail accuracies to ±2%. The MAX805L is the same as the MAX690A except that RESET is provided instead of active-low RESET.

All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin compatible with the MAX690 and MAX694. The MAX692A/MAX802M are pin compatible with the MAX692.
MAX690A, MAX692A, MAX802L, MAX802M, MAX805L: Typical Operating Circuit MAX690A, MAX692A, MAX802L, MAX802M, MAX805L: Typical Operating Circuit Enlarge+

Key Features

  • Precision Supply Voltage Monitor:
    • 4.65V for MAX690A/MAX802L/MAX805L
    • 4.40V for MAX692A/MAX802M
  • Reset Time Delay: 200ms
  • Watchdog Timer: 1.6s Timeout
  • Battery-Backup Power Switching
  • 200µA Quiescent Supply Current
  • 50nA Quiescent Supply Current in Battery-Backup Mode
  • Voltage Monitor for Power-Fail or Low-Battery Warning
  • Power-Fail Accuracy Guaranteed to ±2% (MAX802L/M)
  • Guaranteed Active-Low RESET Assertion to VCC = 1V
  • 8-Pin SO and DIP Packages

Applications/Uses

  • Battery-Powered Computers/Controllers
  • Critical µP Monitoring
  • Intelligent Instruments

Parametric Specs

See parametric specs for Battery Backup Circuits (80)


Part NumberReset Thresh.
(V)		Reset OutICC
(µA)		Oper. Temp.
(°C)		Package/PinsBudgetary
Price
maxSee Notes
MAX690A 4.5 to 5.0
Active Low
Push-Pull
350
-55 to +125
-40 to +85
0 to +70
CDIP/8
PDIP/8
SOIC (N)/8
$4.07 @1k
MAX692A 4.0 to 4.5
Active Low
Push-Pull
-55 to +125
-40 to +85
0 to +70
CDIP/8
DICE SALES
PDIP/8
SOIC (N)/8
$4.59 @1k
MAX802L 4.5 to 5.0
Active Low
Push-Pull
-40 to +85
0 to +70
PDIP/8
SOIC (N)/8
$4.24 @1k
MAX802M 4.0 to 4.5
Active Low
Push-Pull
-40 to +85
0 to +70
PDIP/8
SOIC (N)/8
$6.53 @1k
MAX805L 4.5 to 5.0
Active High
Push-Pull
-55 to +125
-40 to +85
0 to +70
CDIP/8
PDIP/8
SOIC (N)/8
$3.73 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Quality And Environmental

Request Reliability Report for: MAX805L 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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