Features and Benefits
- VCC1 (Primary Supply) Reset Threshold Voltages from 1.58V to 4.63V
- VCC2 (Secondary Supply) Reset Threshold Voltages from 0.79V to 3.08V
- Externally Adjustable RSTIN Threshold for Auxiliary/Triple-Voltage Monitoring (0.62V Internal Reference)
- Watchdog Timer Option
- 35s (min) Long Startup Period
- 1.12s (min) Normal Timeout Period
- Manual-Reset Input Option
- Power-Fail Input/Power-Fail Output Option (Push-Pull and Open-Drain Active-Low)
- Guaranteed Reset Valid Down to VCC1 or VCC2 = 0.8V
- Reset Output Logic Options
- Immune to Short VCC Transients
- Low Supply Current 14µA (typ) at 3.6V
- Watchdog Disable Feature
- Small 5-, 6-, and 8-Pin SOT23 Packages
- AEC-Q100 Qualified: MAX6719AUTTWD1/V+T
The MAX6715A–MAX6729A/MAX6797A are ultra-low-voltage microprocessor (µP) supervisory circuits designed to monitor two or three system power-supply voltages. These devices assert a system reset if any monitored supply falls below its factory-trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their thresholds. The integrated dual/triple supervisory circuits significantly improve system reliability and reduce size compared to separate ICs or discrete components.
These devices monitor primary supply voltages (VCC1) from 1.8V to 5.0V and secondary supply voltages (VCC2) from 0.9V to 3.3V with factory-trimmed reset threshold voltage options (see the Reset Voltage Threshold Suffix Guide in the full data sheet). An externally adjustable RSTIN input option allows customers to monitor a third supply voltage down to 0.62V. These devices are guaranteed to be in the correct reset output logic state when either VCC1 or VCC2 remains greater than 0.8V.
A variety of push-pull or open-drain reset outputs along with watchdog input, manual-reset input, and power-fail input/output features are available (see the Selector Guide in the full data sheet). Select reset timeout periods from 1.1ms to 1120ms (min) (see the Reset Timeout Period Suffix Guide in the full data sheet). The MAX6715A–MAX6729A/MAX6797A are available in small 5-, 6-, and 8-pin SOT23 packages and operate over the -40°C to +125°C temperature range.
- Industrial Equipment
- Multivoltage Systems
- Portable Battery-Powered Equipment
- Printers/Fax Machines
- Set-Top Boxes
- Telecom/Networking Equipment
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
MAX6721A Reliability Data1/12/2023117K
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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