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Analog Devices Inc./Maxim Integrated MAX6831ZWUT+T
- Part No.:
- MAX6831ZWUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831ZWUT+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,112
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Product details
Overview
MAX6831ZWUT+T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC in SOT23-6 package, monitoring primary VCC (1.53V–2.0V) and secondary VCC2 (2.24V–2.39V) with factory-trimmed thresholds, open-drain active-low RESET output, manual reset input, and 1.6s watchdog timeout - used in battery-powered embedded systems requiring reliable brownout detection and system recovery.
For engineers reviewing the MAX6831ZWUT+T datasheet, MAX6831ZWUT+T pinout, MAX6831ZWUT+T application, or MAX6831ZWUT+T equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use cases for portable equipment and multivoltage systems, and two validated alternative parts with documented functional differences.
Technical Context
The MAX6831ZWUT+T integrates dual independent voltage comparators: one for VCC (threshold = 1.67V typ at -40°C to +125°C), another for VCC2 (2.313V typ), both feeding into a reset timeout delay generator (140ms min). Its open-drain RESET output enables bidirectional µP reset pin interfacing without contention.
It features a dedicated WDI input with glitch-immune transition detection, internal 50kΩ MR pullup, and guaranteed reset assertion down to VCC = +1.0V - enabling operation during deep brownout conditions where other supervisors fail. No external components are required for basic supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 1.67V (typ), factory-trimmed for +1.53V to +2.0V supply range - ensures precise power-up sequencing in low-voltage SoC rails. |
| VCC2 Threshold | 2.313V (typ), fixed internal monitor for secondary supply - eliminates need for external resistor divider when tracking 2.5V or 2.3V rails. |
| Reset Timeout | 140ms (min), monotonic delay after all supplies recover - prevents premature µP release before power stabilizes. |
| Watchdog Timeout | 1.6s (nominal), temperature-stable period - provides robust software execution monitoring without calibration. |
| RESET Output Type | Open-drain active-low - supports wired-OR reset buses and bidirectional µP reset I/O (e.g., Motorola 68HC11). |
| Operating Temp | -40°C to +125°C - qualified for automotive under-hood and industrial embedded environments. |
| Supply Current | 25µA (max at -40°C to +125°C, VCC = +1.8V) - enables multi-year battery life in portable instrumentation. |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free (+T suffix), 1.6mm × 2.9mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - requires external pullup; asserts low on VCC/VCC2 undervoltage, MR low, or WDI timeout. |
| 2 | GND | Ground reference for all internal comparators and logic - must be low-impedance connection to system ground plane. |
| 3 | MR | Manual reset input, active-low, internally pulled up to VCC (50kΩ) - momentary GND connection forces system reset. |
| 4 | WDI | Watchdog input - toggling within 1.6s clears internal timer; unconnected or high-Z disables watchdog function. |
| 5 | VCC2 | Dedicated secondary supply monitor input - connects directly to 2.24V–2.39V rail; no external components needed. |
| 6 | VCC | Primary supply input and power source - powers internal circuitry and sets operating voltage range (1.53V–2.0V). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC (1.67V) and VCC2 (2.313V) supervision - enables reliable startup and brownout detection in multirail systems without external dividers. |
| Guaranteed reset validity to VCC = +1.0V | Ensures RESET remains asserted even as primary supply collapses - critical for orderly shutdown in battery-depleted states. |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - eliminates false triggers in noisy power environments. |
| No external components required | Factory-trimmed thresholds and integrated pullup eliminate resistors, capacitors, and trimming - reduces BOM count and layout area. |
| 1.6s watchdog with edge-triggered clear | WDI detects rising/falling edges (≥50ns wide) - allows flexible software timing without strict pulse-width constraints. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Handheld medical meters powered by single Li-ion cell (3.0V–4.2V) with 1.8V core and 2.5V I/O rails. IC Role / Device Role / Timing Role: Supervises VCC (1.8V core) and VCC2 (2.5V I/O) to prevent firmware corruption during battery sag; asserts open-drain RESET to hold µP until both rails stabilize. Use Value: Prevents erratic behavior during 10–15% voltage drop common in aging batteries, extending usable runtime without hardware redesign. |
Use Scenario: Industrial PLC controller with separate 3.3V logic, 2.5V sensor interface, and 1.2V FPGA core supplies. IC Role / Device Role / Timing Role: Monitors primary VCC (1.8V auxiliary rail) and secondary VCC2 (2.313V sensor rail); generates synchronized reset pulse across subsystems via shared RESET bus. Use Value: Eliminates need for three discrete supervisors - reduces PCB area by 67% and removes timing skew between rail resets. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Portable gas analyzer using low-power ARM Cortex-M0 with 1.5V core, 2.3V analog front-end, and 3.3V display driver. IC Role / Device Role / Timing Role: Tracks VCC (1.67V) and VCC2 (2.313V) to detect simultaneous brownout in digital and analog domains; triggers watchdog if firmware hangs during sensor calibration. Use Value: Ensures measurement integrity by forcing full system reset upon any rail failure - meets IEC 61000-4-11 immunity requirements. |
Use Scenario: Automotive body control module with ASIL-B safety requirement, monitoring 1.8V MCU core and 2.5V CAN transceiver supply. IC Role / Device Role / Timing Role: Provides independent fault detection on two critical rails; open-drain RESET interfaces directly to MCU's bidirectional reset pin without level-shifting. Use Value: Enables single-chip supervision meeting ISO 26262 diagnostic coverage targets for power-rail faults - reduces FMEDA effort by 40%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830ZWUT+T | Push-pull active-high RESET output instead of open-drain active-low; same VCC/VCC2 thresholds and watchdog timing. | Requires inverted reset logic on µP side; incompatible with bidirectional reset pins or wired-OR buses. | Select when µP reset input is active-high and board layout lacks space for external pullup resistor. |
| TPS3808G18DBVR | Single-supply supervisor (1.8V threshold only); no VCC2 monitor, no watchdog, push-pull RESET; 1.2ms reset timeout. | Lacks dual-rail monitoring and system-level watchdog - suitable only for simple single-rail applications. | Select when supervising only one supply rail and lowest possible quiescent current (1.5µA) is prioritized over feature set. |
Compared with MAX6830ZWUT+T, MAX6831ZWUT+T enables direct interface to bidirectional reset pins without external components; compared with TPS3808G18DBVR, it adds critical dual-rail monitoring and watchdog functionality essential for complex embedded systems.
Availability
MAX6831ZWUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring requiring stable component supply across automotive, industrial, and medical end markets.
Supply support for MAX6831ZWUT+T 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 and mixed-signal ICs for power, sensing, and connectivity applications - with focus on high-reliability, low-power, and small-footprint solutions.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail supervision in space-constrained, battery-sensitive systems - delivering guaranteed operation down to 1.0V VCC while integrating manual reset and watchdog in SOT23-6.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831ZWUT+T?
The MAX6831ZWUT+T has a factory-trimmed VCC2 reset threshold of 2.313V (typical) at -40°C to +85°C, with tolerance of 2.238V to 2.388V over -40°C to +125°C. This value is fixed and does not require external resistor configuration - unlike the adjustable RESET IN input found on MAX6826–MAX6828 variants.
Does MAX6831ZWUT+T support bidirectional microprocessor reset pins?
Yes, MAX6831ZWUT+T supports bidirectional µP reset pins via its open-drain active-low RESET output. When connected directly to a bidirectional reset I/O (e.g., Motorola 68HC11), a single external pullup resistor enables both supervisor-initiated reset assertion and µP-driven reset signaling - eliminating contention and level-shifting circuitry.
What is the minimum VCC voltage at which MAX6831ZWUT+T guarantees valid reset operation?
MAX6831ZWUT+T guarantees valid reset assertion and timing down to VCC = +1.0V across the full operating temperature range (-40°C to +125°C). Below this voltage, internal comparators and logic may become indeterminate - making it suitable for deep brownout detection where other supervisors lose functionality.
How does the watchdog timeout behave when WDI is left unconnected on MAX6831ZWUT+T?
When WDI is left unconnected on MAX6831ZWUT+T, the internal watchdog timer is automatically cleared every ~1.4 seconds by an internal low-high-low pulse - effectively disabling the watchdog function. This behavior is documented in the datasheet and requires no external components or configuration.
Can MAX6831ZWUT+T monitor a 1.2V supply rail?
No, MAX6831ZWUT+T cannot directly monitor a 1.2V supply. Its VCC input is specified for 1.53V–2.0V operation, and its VCC2 monitor is factory-trimmed to 2.313V. To supervise a 1.2V rail, use MAX6826–MAX6828 variants with the adjustable RESET IN input (0.63V threshold) and an external resistor divider - not supported by MAX6831ZWUT+T.
MAX6831ZWUT+T 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.67V, 2.313V
- 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-6
MAX6831ZWUT+T FAQ
1.How can I place an order for MAX6831ZWUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831ZWUT+T 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 MAX6831ZWUT+T reliable?
The price and inventory of MAX6831ZWUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831ZWUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831ZWUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831ZWUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831ZWUT+T?
MAX6831ZWUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831ZWUT+T 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 MAX6831ZWUT+T?
For technical support, including MAX6831ZWUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831ZWUT+T requirements.
6.How does Aetrix verify that MAX6831ZWUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831ZWUT+T 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 MAX6831ZWUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831ZWUT+T?
All MAX6831ZWUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831ZWUT+T, 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 MAX6831ZWUT+T part is unused and in its original packaging.
Return procedure for MAX6831ZWUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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