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Analog Devices Inc./Maxim Integrated MAX6831TZUT+
- Part No.:
- MAX6831TZUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831TZUT+.pdf
- Description:
- MAX6831 DUAL ULTRA-LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:4,281
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Product details
Overview
MAX6831TZUT+ from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) from +1.8V to +5.0V and secondary supply (VCC2) from +0.9V to +2.5V with factory-trimmed thresholds, featuring open-drain RESET output, manual reset input (MR), watchdog timer (1.6s timeout), and guaranteed reset validity down to VCC = +1.0V - used in battery-powered embedded controllers and multivoltage automotive systems.
For engineers reviewing the MAX6831TZUT+ datasheet, MAX6831TZUT+ pinout, MAX6831TZUT+ application, or MAX6831TZUT+ equivalent, key selection considerations include its open-drain RESET configuration, dual-supply monitoring capability with fixed VCC2 threshold, 140ms minimum reset timeout, immunity to short negative VCC transients, and operation across –40°C to +125°C industrial temperature range.
Technical Context
The MAX6831TZUT+ integrates two independent voltage monitors: one for VCC (programmable via suffix 'T' = 3.08V nominal threshold) and one for VCC2 (factory-trimmed to 1.665V nominal per 'Z' suffix), both feeding into a shared reset timeout delay generator (≥140ms). Its watchdog circuit triggers reset if WDI remains static beyond 1.6s, cleared by any edge transition.
It uses internal 50kΩ pull-up on MR, supports CMOS- or open-drain-driven manual reset, and asserts open-drain RESET low during fault conditions - requiring external pull-up for active-high logic compatibility. Reset remains asserted for full timeout after all monitored voltages recover, MR releases, or watchdog expires.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.08V (nominal, 'T' suffix), ±3% over –40°C to +125°C - sets primary power-fail detection point for 3.3V systems |
| VCC2 Threshold | 1.665V (nominal, 'Z' suffix), ±3% over –40°C to +125°C - factory-trimmed for accurate monitoring of 1.8V I/O or core rails |
| Reset Timeout | 140ms (min), 320ms (max) - ensures sufficient hold time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s (nominal), ±60% over –40°C to +125°C - provides robust software execution monitoring without excessive sensitivity |
| Operating Voltage | VCC = +2.7V to +3.6V ('T'/'S'/'R' versions), valid reset assertion down to VCC = +1.0V - enables brownout detection during deep discharge |
| RESET Output Type | Open-drain - allows wired-OR configuration, bidirectional µP reset pin interfacing (e.g., Motorola 68HC11), and flexible voltage-level translation |
| Supply Current | 25µA max at VCC = +3.6V, –40°C to +125°C - minimizes quiescent load in always-on battery-backed subsystems |
Pinout & Package
MAX6831TZUT+ is housed in a 6-pin SOT23-6 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead-free ('+' suffix), with thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - requires external pull-up; sinks ≥50µA at 0.4V for reliable µP reset assertion |
| 2 | GND | Ground reference for all internal comparators and timing circuits - must be low-impedance connection to system ground plane |
| 3 | MR | Manual reset input, active-low with internal 50kΩ pull-up to VCC - debounced by design; 1µs minimum pulse width accepted |
| 4 | WDI | Watchdog input - toggling within 1.6s prevents reset; left floating or three-stated disables watchdog; accepts 50ns pulses |
| 5 | VCC2 | Secondary supply monitor input - connects directly to 0.9V–2.5V rail; internally compared to 1.665V threshold |
| 6 | VCC | Primary supply input and power source - powers internal circuitry; monitored against 3.08V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC (3.08V) and VCC2 (1.665V) enables robust multirail system reliability without external dividers |
| Open-drain RESET with guaranteed sink capability | Sinks ≥50µA at 0.4V under VCC ≥ 4.25V - ensures compatible reset assertion across mixed-voltage µP families |
| Factory-trimmed VCC2 threshold | 1.665V ±3% accuracy eliminates calibration overhead and improves yield in production test for 1.8V I/O rail monitoring |
| Watchdog with edge-triggered clear | Any rising or falling edge on WDI resets 1.6s timer - supports flexible software heartbeat placement without strict periodicity |
| Immunity to short VCC glitches | Rejects negative transients ≤20µs at 100mV overdrive - prevents spurious resets during switching noise or ESD events |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Long-life coin-cell or Li-ion powered sensor node operating across wide temperature and voltage ranges. IC Role / Device Role / Timing Role: Dual-supply supervisor ensuring clean boot and brownout recovery for MCU and RF transceiver rails. Use Value: Guarantees reset assertion down to VCC = +1.0V and consumes only 25µA, extending battery life while preventing undefined MCU states. |
Use Scenario: Industrial PLC controller with separate 3.3V CPU core and 1.8V I/O interface supplies. IC Role / Device Role / Timing Role: Monitors both rails independently and asserts coordinated reset to prevent bus contention or register corruption. Use Value: Factory-trimmed 1.665V VCC2 threshold matches 1.8V I/O rail tolerance; 140ms timeout exceeds typical FPGA configuration time. |
| Automotive Systems | Critical µP Monitoring |
Use Scenario: Body control module exposed to cold-crank (down to +6V) and load-dump (up to +40V) transients. IC Role / Device Role / Timing Role: Supervises main 3.3V domain and auxiliary 1.8V CAN transceiver supply under harsh electrical conditions. Use Value: Immunity to short negative VCC transients avoids false resets during cranking; –40°C to +125°C rating meets AEC-Q100 Grade 2. |
Use Scenario: Medical infusion pump requiring fail-safe restart after power interruption or software hang. IC Role / Device Role / Timing Role: Provides hardware-enforced reset via VCC/VCC2 monitoring and watchdog supervision of safety-critical firmware. Use Value: Open-drain RESET interfaces directly with bidirectional µP reset pins; 1.6s watchdog timeout balances responsiveness and noise immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6829TZUT+ | Push-pull active-low RESET output; same VCC/VCC2 thresholds (3.08V/1.665V); no open-drain flexibility | Requires no external pull-up; unsuitable for wired-OR or bidirectional reset I/O | Select when driving standard active-low µP reset inputs without level-shifting or OR-ing requirements |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no VCC2 monitor; fixed 200ms reset timeout; different pinout (SOT23-6 but pin 5 = GND) | Lacks secondary supply monitoring; cannot replace dual-rail supervision without redesign | Choose only if system has single 3.3V rail and space/power constraints favor TI's lower 1.2µA quiescent current |
Compared with MAX6831TZUT+, MAX6829TZUT+ offers simpler drive but sacrifices interface flexibility, while TPS3808G33DBVR reduces cost and current draw at the expense of dual-supply functionality - making MAX6831TZUT+ uniquely suited for compact multivoltage systems needing open-drain coordination.
Availability
MAX6831TZUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and automotive systems requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX6831TZUT+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and high-reliability ICs for demanding industrial, automotive, and medical applications.
The MAX6826–MAX6831 family delivers ultra-low-voltage dual-supply supervision with integrated watchdog and manual reset - engineered specifically for space-constrained, multirail embedded systems where power integrity and deterministic reset behavior are critical.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831TZUT+?
The MAX6831TZUT+ has a factory-trimmed VCC2 reset threshold of 1.665V (nominal), with ±3% tolerance over –40°C to +125°C. This value is fixed by the 'Z' suffix in the part number and does not require external resistor networks - enabling precise monitoring of 1.8V I/O supplies without calibration.
Does MAX6831TZUT+ support manual reset deassertion before the timeout completes?
Yes. When MR is pulled low, MAX6831TZUT+ asserts reset immediately. Upon release (MR rising), reset remains asserted for the full programmed timeout period (≥140ms), regardless of MR state - ensuring µP initialization completes before release. The internal 50kΩ pull-up holds MR high when unused.
Can MAX6831TZUT+ monitor a 2.5V supply on the VCC2 pin?
No. The MAX6831TZUT+ VCC2 input is factory-trimmed to 1.665V and specified for monitoring supplies from +0.9V to +2.5V, but its comparator trips only when VCC2 falls below 1.665V. A 2.5V rail remains above threshold and will not trigger reset - use MAX6830 or MAX6829 variants with higher VCC2 thresholds (e.g., 'V' = 1.575V, 'W' = 1.665V, 'Y' = 2.188V) for 2.5V monitoring.
What is the watchdog timeout accuracy of MAX6831TZUT+ over temperature?
The MAX6831TZUT+ watchdog timeout is 1.6s nominal at +25°C, with ±60% variation over –40°C to +125°C. This wide tolerance reflects process and temperature dependencies of the internal RC oscillator - design must accommodate worst-case 0.8s to 2.6s window for reliable software heartbeat placement.
Is MAX6831TZUT+ pin-compatible with other devices in the MAX6826–MAX6831 family?
Yes. All MAX6826–MAX6831 devices share identical SOT23-6 pinout and footprint. However, function differs per variant: MAX6831TZUT+ uses Pin 5 as VCC2 (not RESET IN), and Pin 1 is open-drain RESET. Swapping with MAX6826/MAX6827/MAX6828 (which use Pin 5 as RESET IN) requires PCB layout change due to differing pin functions.
MAX6831TZUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V, 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6831TZUT+ FAQ
1.How can I place an order for MAX6831TZUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831TZUT+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX6831TZUT+ reliable?
The price and inventory of MAX6831TZUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831TZUT+ is usually 5 days.
3.What payment methods are accepted for MAX6831TZUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831TZUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831TZUT+?
MAX6831TZUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831TZUT+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX6831TZUT+?
For technical support, including MAX6831TZUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831TZUT+ requirements.
6.How does Aetrix verify that MAX6831TZUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6831TZUT+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX6831TZUT+ meets industry standards.
7.What is the process for return or replacement of MAX6831TZUT+?
All MAX6831TZUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831TZUT+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX6831TZUT+ part is unused and in its original packaging.
Return procedure for MAX6831TZUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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