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Analog Devices Inc./Maxim Integrated MAX6831SDUT+T
- Part No.:
- MAX6831SDUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SDUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,576
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Product details
Overview
MAX6831SDUT+T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, factory-trimmed VCC2 monitor (2.93V threshold), manual reset input, and 1.6s watchdog timer. It monitors primary supply VCC (2.85–3.00V range) and secondary supply VCC2 (2.93V nominal), asserts reset on undervoltage or watchdog timeout, and guarantees valid reset operation down to VCC = +1.2V over –40°C to +125°C. It is used in portable battery-powered equipment requiring reliable brownout protection and system-level fault recovery.
For engineers reviewing the MAX6831SDUT+T datasheet, MAX6831SDUT+T pinout, MAX6831SDUT+T application, or MAX6831SDUT+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, confirmed reset threshold tolerances across temperature, and validated alternative options for dual-supply µP supervision in space-constrained embedded systems.
Technical Context
The MAX6831SDUT+T implements a dual-threshold monitoring architecture: one factory-trimmed comparator for VCC2 (2.93V at +25°C, ±30mV over –40°C to +125°C) and a second preprogrammed comparator for VCC (2.93V nominal, S-suffix). Its open-drain RESET output interfaces directly with bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pullup. The internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within its timeout window.
Reset assertion is synchronized to voltage thresholds with 20µs propagation delay (VCC→RESET) and 15µs (VCC2→RESET), while the minimum reset timeout period is 140ms-guaranteed over full industrial temperature range. The device draws only 7–25µA ICC (depending on VCC and temperature), enabling use in always-on battery-backed subsystems without compromising runtime.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (nominal), ±0.07V over –40°C to +125°C - sets primary supply brownout detection point |
| VCC2 Reset Threshold | 2.93V (factory-trimmed), ±0.07V over –40°C to +125°C - fixed secondary supply monitor for I/O rails |
| Reset Timeout Period | 140ms (min), 320ms (max) over –40°C to +125°C - ensures µP completes power stabilization before release |
| Watchdog Timeout | 1.6s (nominal), 0.8–2.6s over –40°C to +125°C - provides software execution monitoring with temperature-compensated timing |
| Supply Current (ICC) | 7µA (typ @ +25°C, VCC = +3.6V), ≤25µA max over –40°C to +125°C - enables multi-year battery life in low-power modes |
| Operating Voltage Range | +1.2V to +5.5V on VCC, +0.9V to +2.5V on VCC2 - supports modern sub-2V core and I/O supplies |
| RESET Output Type | Open-drain active-low - allows wired-OR reset bus sharing and direct interface with bidirectional µP reset pins |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, 21-0058 land pattern), RoHS-compliant lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low during reset assertion; requires external pullup; compatible with bidirectional µP reset I/O |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and output stage |
| 3 - MR | Manual reset input (active-low) | Internal 50kΩ pullup to VCC; asserts reset when pulled low; debounced internally |
| 4 - WDI | Watchdog input | Edge-sensitive; resets 1.6s timer on rising or falling edge; disabled if left floating or three-stated |
| 5 - VCC2 | Secondary supply monitor input | Factory-trimmed 2.93V threshold comparator input; connects directly to monitored I/O rail |
| 6 - VCC | Primary supply monitor input | Preprogrammed 2.93V threshold comparator input; powers internal circuitry and references all analog blocks |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (2.93V) and VCC2 (2.93V) with separate comparators and hysteresis |
| Guaranteed reset validity down to VCC = +1.2V | Ensures deterministic reset assertion even during deep brownout conditions in low-voltage systems |
| 1.6s watchdog timer with edge-triggered clear | Monitors µP firmware liveness via WDI transitions; immune to stuck-high/low faults |
| No external components required | Integrates precision voltage references, timing capacitors, pullup resistors, and logic-reduces BOM count and board area |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset-eliminates need for external filtering |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Wearable health monitor with dual-rail power (1.8V core, 2.8V sensor I/O) operating from coin-cell battery. IC Role / Device Role / Timing Role: MAX6831SDUT+T monitors both rails and asserts open-drain RESET to ARM Cortex-M0+ during brownout or firmware hang. Use Value: Prevents corrupted sensor data writes and flash corruption by enforcing clean reset before voltage collapse, extending usable battery life via ultra-low 7µA quiescent current. |
Use Scenario: Industrial PLC module with isolated communication interface and dual 3.3V/2.8V supplies. IC Role / Device Role / Timing Role: MAX6831SDUT+T provides coordinated reset of main µP and isolated UART controller upon either supply failure. Use Value: Eliminates need for discrete reset ICs per rail-single SOT23 device reduces footprint by >60% vs. dual discrete supervisors. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Handheld multimeter with LCD, ADC, and Bluetooth LE radio powered from rechargeable Li-ion cell. IC Role / Device Role / Timing Role: MAX6831SDUT+T supervises 3.0V analog front-end and 2.9V BLE SoC supply, triggering watchdog reset if measurement firmware stalls. Use Value: Ensures instrument returns to known state after transient ESD event or code lockup-no user intervention required. |
Use Scenario: Medical infusion pump controller where µP failure could cause unsafe dosing. IC Role / Device Role / Timing Role: MAX6831SDUT+T serves as independent safety monitor, asserting hardware reset if main µP fails to service WDI within 1.6s. Use Value: Meets IEC 62304 Class C software safety requirements by providing externally verifiable, analog-based fault detection path. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830SDUT+T | Push-pull active-high RESET output; identical VCC/VCC2 thresholds and watchdog timing | Requires level-shifting or µP with active-high reset input; not compatible with bidirectional reset pins | Select when system design mandates active-high reset signaling and no shared reset bus is needed |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitor; 200ms reset timeout; no watchdog input | Lacks secondary supply monitoring and firmware watchdog capability-requires additional ICs for full functionality | Choose only for cost-sensitive, single-rail applications where watchdog and dual-monitoring are unnecessary |
Compared with MAX6831SDUT+T, MAX6830SDUT+T offers identical supervision accuracy but different reset polarity and drive type, while TPS3808G33DBVR provides lower-cost single-rail supervision at the expense of missing critical dual-monitoring and watchdog features essential for robust embedded control.
Availability
MAX6831SDUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6831SDUT+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, mixed-signal, and high-reliability semiconductor solutions for industrial, medical, and communications markets.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-operated systems-emphasizing guaranteed operation down to 1.2V, minimal quiescent current, and integrated watchdog functionality.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831SDUT+T and how does it vary with temperature?
The MAX6831SDUT+T has a factory-trimmed VCC2 reset threshold of 2.93V (nominal) at +25°C, with tolerance of ±0.07V over the full –40°C to +125°C operating range. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for the 'S' suffix variant. The device exhibits a typical temperature coefficient of 60ppm/°C, resulting in <±3mV drift across temperature-verified in the Typical Operating Characteristics plots (toc05).
Does MAX6831SDUT+T support interfacing with microcontrollers that have bidirectional reset pins?
Yes, MAX6831SDUT+T supports direct interfacing with bidirectional reset pins (e.g., Motorola 68HC11) because its RESET output is open-drain active-low. A single external pullup resistor connects RESET to the µP's reset pin, allowing the µP to drive the line low during its own reset sequence while the MAX6831SDUT+T asserts reset when needed. This configuration is explicitly validated in the Applications Information section (Figure 6).
What is the minimum pulse width required on the WDI pin to prevent reset assertion in MAX6831SDUT+T?
The MAX6831SDUT+T requires a minimum WDI pulse width of 50ns to reliably clear the watchdog timer, as specified in the Electrical Characteristics table under "WDI Pulse Width". Pulses shorter than this may fail to register, causing unintended reset assertion after the 1.6s timeout. This specification is tested and guaranteed across –40°C to +125°C.
Can MAX6831SDUT+T monitor a 1.8V supply as VCC and a 2.8V supply as VCC2?
No-MAX6831SDUT+T is factory-configured for VCC and VCC2 thresholds both at 2.93V (S-suffix). It cannot monitor 1.8V or 2.8V supplies unless those values fall within its specified tolerance band (2.86V–3.00V at +25°C). For 1.8V monitoring, a different variant (e.g., MAX6826VDUT+T with V-suffix) would be required. The Selector Guide confirms MAX6831 supports only fixed 2.93V VCC2 monitoring.
What is the maximum allowable leakage current on the WDI pin when left unconnected in MAX6831SDUT+T?
When WDI is left unconnected or three-stated, the MAX6831SDUT+T specifies a maximum allowable leakage current of 10µA, as stated in the Applications Information section. Exceeding this limit risks unreliable watchdog disable behavior, since the internal driver relies on low leakage to maintain proper timer servicing every ~1.4s. This value is distinct from the WDI input current spec (±160µA) which applies only when actively driven.
MAX6831SDUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 0.788V, 2.93V
- 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
MAX6831SDUT+T FAQ
1.How can I place an order for MAX6831SDUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SDUT+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 MAX6831SDUT+T reliable?
The price and inventory of MAX6831SDUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SDUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831SDUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SDUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SDUT+T?
MAX6831SDUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SDUT+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 MAX6831SDUT+T?
For technical support, including MAX6831SDUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SDUT+T requirements.
6.How does Aetrix verify that MAX6831SDUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831SDUT+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 MAX6831SDUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831SDUT+T?
All MAX6831SDUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SDUT+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 MAX6831SDUT+T part is unused and in its original packaging.
Return procedure for MAX6831SDUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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