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Voltage Supervisors 
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MAX6725A
Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory Circuits
Dual/Triple-Voltage, µP Supervisors with Watchdog, Manual Reset Input, and/or Power-Fail Comparator
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Key Features
Applications/Uses
Parametric specs for Supervisors (3 Monitored Voltages)
| Reset Thresh. (V) | 0 to 1.2 1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5 |
| Reset Thresh. Accur. (%) (@ +25°C) | 2.5 |
| Reset Out | Active High Active Low Open Drain |
| Interface | Factory Fixed |
| tRESET (min) | 1ms to 15ms 15ms to 85ms 85ms to 300ms 300ms to 1s >1s |
| Watchdog Feature | Extended Setup Period Input (WDI) |
| Watchdog Timeout | 1s to 2s >2s |
| Supervisor Features | Adjustable Reset Input Manual Reset |
| ICC (µA) (max) | 39 |
| Package/Pins | SOT23/8 |
| Budgetary Price (See Notes) | 1.81 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory Circuits | Feb 10, 2020 |
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Parameters
Parametric specs for Supervisors (3 Monitored Voltages)
| Reset Thresh. (V) | 0 to 1.2 1.2 to 1.8 1.8 to 2.5 2.5 to 3.3 3.3 to 5.5 |
| Reset Thresh. Accur. (%) (@ +25°C) | 2.5 |
| Reset Out | Active High Active Low Open Drain |
| Interface | Factory Fixed |
| tRESET (min) | 1ms to 15ms 15ms to 85ms 85ms to 300ms 300ms to 1s >1s |
| Watchdog Feature | Extended Setup Period Input (WDI) |
| Watchdog Timeout | 1s to 2s >2s |
| Supervisor Features | Adjustable Reset Input Manual Reset |
| ICC (µA) (max) | 39 |
| Package/Pins | SOT23/8 |
| Budgetary Price (See Notes) | 1.81 |
Key Features
- 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
Applications/Uses
- Computers/Servers
- Industrial Equipment
- Multivoltage Systems
- Portable Battery-Powered Equipment
- Printers/Fax Machines
- Set-Top Boxes
- Telecom/Networking Equipment
Description
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.
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.
Technical Docs
| Data Sheet | Dual/Triple, Ultra-Low-Voltage, SOT23 µP Supervisory Circuits | Feb 10, 2020 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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