MAX696
Microprocessor Supervisory Circuits
Industry-Standard, Full-Function uP Supervisor
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Overview
Features and Benefits
- Adjustable Low-Line Monitor and Power-Down Reset
- Power-OK/Reset Time Delay
- Watchdog Timer—100ms, 1.6s, or Adjustable
- Minimum Component Count
- 1µA Standby Current
- Battery-Backup Power Switching (MAX696)
- On-Board Gating of Chip-Enable Signals (MAX697)
- Separate Monitor for Power-Fail or Low-Battery Warning
Product Details
The MAX696/MAX697 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX696/MAX697 significantly improve system reliability and accuracy compared to that obtained with separate ICs or discrete components.
The MAX696 and MAX697 are supplied in 16-pin packages and perform six functions:
- A reset output during power-up, power-down, and brownout conditions. The threshold for this "lowline" reset is adjustable by an external voltage-divider.
- A reset pulse if the optional watchdog timer has not been toggled within a specified time.
- Individual outputs for low-line and watchdog fault conditions.
- The reset time may be left at its default value of 50ms, or may be varied with an external capacitor or clock pulses.
- A separate 1.3V threshold detector for power-fail warning, low-battery detection, or to monitor a power supply other than VCC.
The MAX697 lacks battery-backup switching, but has write-protection pins (active-low CE IN and active-low CE OUT) for CMOS RAM or EPROM. In addition, it consumes less than 250 microamperes.
Applications
- Computers
- Controllers
- Critical µP Power Monitoring
- Intelligent Instruments
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
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MAX696 Reliability Data1/12/2023PDF26K
Design Resources
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.
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