MAX691

PRODUCTION

Microprocessor Supervisory Circuits

Industry-Standard, Full-Function µP Supervisor

Data Sheet (Rev. 5) Product Selection Table

Part Models: 9
1ku List Price: Starting From $5.70

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Overview

Supervisory Function Integration Saves Board Space while Fully Protecting Microprocessor-Based Systems
- Precision Voltage Monitor
  - 4.65V (MAX690, MAX691, MAX694, MAX695)
  - 4.40V (MAX692, MAX693)
- Power OK/Reset Time Delay
  - 50ms, 200ms, or Adjustable
- Watchdog Timer
  - 100ms, 1.6s, or Adjustable
- Battery Backup Power Switching
- Voltage Monitor for Power Fail or Low Battery Warning
- Minimum External Component Count
Low Power Consumption in Battery Backup Mode Extends Battery Life
- 1µA Standby Current
Onboard Gating of Chip Enable Signals Protects Against Erroneous Data Written to RAM During Low V_CC Events

The MAX690 family of supervisory circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX690 family significantly improves system reliability and accu- racy compared to that obtainable with separate ICs or discrete components.

The MAX690, MAX692, and MAX694 are supplied in 8-pin packages and provide four functions:

A reset output during power-up, power-down, and brownout conditions.
Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic.
A Reset pulse if the optional watchdog timer has not been toggled within a specified time.
A 1.3V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5V.

The MAX691, MAX693, and MAX695 are supplied in 16-pin packages and perform all MAX690, MAX692, MAX694 functions, plus:

Write protection of CMOS RAM or EEPROM.
Adjustable reset and watchdog timeout periods.
Separate outputs for indicating a watchdog timeout, backup-battery switchover, and low V_CC.

Applications

Automotive Systems
Computers
Controllers
Critical µP Power Monitoring
Intelligent Instruments

Part Models: 9
1ku List Price: Starting From $5.70

Documentation

Data Sheet 2

MAX690-MAX695: Microprocessor Supervisory Circuits Data Sheet (Rev.5) 05/06/2015

MAX690: Military Datasheet 09/11/2023

Reliability Data 1

MAX691 Reliability Data 01/12/2023

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
MAX691CPE+	Plastic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691CWE+	Small-Outline IC, Wide (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691CWE+T	Small-Outline IC, Wide (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691EJE	Ceramic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691EPE+	Plastic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691EWE+	Small-Outline IC, Wide (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691EWE+T	Small-Outline IC, Wide (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691MJE	Ceramic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
MAX691MJE/883B	Ceramic Dual-In-Line, Narrow (0.3in)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Supervisory Circuits & Reset ICs 7
MAX6361	PRODUCTION	SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup
MAX6362	PRODUCTION	SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup
MAX6363	PRODUCTION	SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup
MAX6364	PRODUCTION	SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup

MAX802L	PRODUCTION	Microprocessor Supervisory Circuits
MAX802M		Microprocessor Supervisory Circuits
MAX805L	PRODUCTION	Microprocessor Supervisory Circuits

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