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Analog Devices Inc./Maxim Integrated MAX6831VFUT+T
- Part No.:
- MAX6831VFUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831VFUT+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,812
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Product details
Overview
MAX6831VFUT+T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory IC in SOT23-6 package, monitoring primary VCC (1.53V–2.0V range) and secondary VCC2 (1.575V threshold) with open-drain active-low RESET output, manual reset input (MR), and 1.6s watchdog timer. It guarantees valid reset assertion down to VCC = +1.0V and supports portable/battery-powered equipment requiring robust brownout protection.
For engineers reviewing the MAX6831VFUT+T datasheet, MAX6831VFUT+T pinout, MAX6831VFUT+T application, or MAX6831VFUT+T equivalent, this page delivers verified functional identity, exact reset thresholds (VTH = 1.575V, VTH2 = 1.575V), open-drain RESET behavior, watchdog timeout (1.6s), and confirmed SOT23-6 package mapping - all validated against Maxim's official Rev 3 datasheet (19-1867).
Technical Context
The MAX6831VFUT+T implements a dual-threshold supervision architecture: one factory-trimmed comparator monitors VCC (threshold suffix 'V' = 1.575V ±25mV over –40°C to +125°C), and a second monitors VCC2 (also 1.575V) via dedicated pin. Its open-drain RESET output enables bidirectional µP reset I/O interfacing (e.g., Motorola 68HC11) and supports wired-OR configurations.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, a 140ms minimum reset timeout delay, and MR with internal 50kΩ pullup. Immunity to short negative VCC transients (<20µs at 100mV overdrive) ensures stability during power-rail glitches without false resets.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 1.575V (factory-trimmed, ±25mV over –40°C to +125°C); sets primary supply brownout detection point for 1.53V–2.0V systems |
| VCC2 Threshold | 1.575V (factory-trimmed, ±25mV over –40°C to +125°C); monitors secondary supply independently of VCC |
| RESET Output Type | Active-low open-drain; enables direct interface with bidirectional µP reset pins and wired-OR reset bus topologies |
| Reset Timeout Period | 140ms minimum; ensures µP remains held in reset long enough for stable power recovery before code execution |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over temperature); provides fail-safe recovery if firmware hangs or fails to toggle WDI |
| Operating Voltage Range | VCC = +1.53V to +2.0V; supports low-power core supplies in modern embedded and battery-operated devices |
| Supply Current (ICC) | 25µA max at –40°C to +125°C, VCC = +1.8V; enables multi-year operation in energy-constrained applications |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free (+T suffix), -40°C to +125°C operating range.
| 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, timers, and I/O; must be low-impedance connection to system ground plane |
| 3 | MR | Manual reset input (active-low); internal 50kΩ pullup to VCC; reset asserted while low and for full timeout period after release |
| 4 | WDI | Watchdog input; toggling within 1.6s clears internal timer; left unconnected or three-stated disables watchdog function |
| 5 | VCC2 | Dedicated secondary supply monitor input; factory-trimmed to 1.575V; connects directly to monitored rail (e.g., 1.8V I/O supply) |
| 6 | VCC | Primary supply input and power source; powers internal circuitry; threshold set to 1.575V for core voltage supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC (1.575V) and VCC2 (1.575V) with separate comparators eliminates need for external resistive dividers |
| Open-drain RESET with bidirectional compatibility | Direct interface to µPs with shared reset I/O (e.g., 68HC11) using single pullup resistor; supports system-level reset arbitration |
| Guaranteed reset validity to VCC = +1.0V | Ensures reliable reset assertion even during deep brownout conditions where VCC drops below normal operating range |
| No external components required | Factory-trimmed thresholds, internal pullup on MR, and integrated watchdog eliminate discrete resistors, capacitors, or timing components |
| Immunity to short VCC transients | Withstands ≤20µs negative-going VCC glitches down to 100mV below threshold without spurious reset generation |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitor powered by single Li-ion cell with 1.8V I/O rail and 1.55V core supply. IC Role / Device Role / Timing Role: MAX6831VFUT+T monitors both rails independently and asserts open-drain RESET to hold MCU in reset until both stabilize post-power-up. Use Value: Prevents erratic boot behavior during battery voltage sag; 25µA ICC extends runtime in sleep mode. |
Use Scenario: Industrial PLC controller with dual-supply FPGA (1.5V core, 1.8V I/O) and real-time watchdog requirements. IC Role / Device Role / Timing Role: MAX6831VFUT+T supervises core and I/O voltages while providing 1.6s watchdog timeout to detect firmware lockups. Use Value: Eliminates need for discrete supervisor + external watchdog IC; open-drain RESET interfaces cleanly with FPGA reset pin. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with precision ADC powered by regulated 1.55V rail and display driver at 1.8V. IC Role / Device Role / Timing Role: MAX6831VFUT+T detects undervoltage on both rails and holds system in reset until both exceed 1.575V with 140ms timeout. Use Value: Ensures ADC calibration and display initialization occur only under stable supply conditions, improving measurement accuracy. |
Use Scenario: Medical infusion pump MCU requiring fail-safe reset during mains-to-battery switchover. IC Role / Device Role / Timing Role: MAX6831VFUT+T monitors battery-backed core supply and auxiliary logic rail, asserting RESET on any drop below 1.575V. Use Value: Guarantees reset remains valid down to VCC = +1.0V, preventing unsafe operation during deep discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830VFUT+T | Push-pull active-high RESET output (not open-drain); identical VCC/VCC2 thresholds (1.575V) and watchdog timing | Requires level-shifting or redesign for µPs with active-low or bidirectional reset pins; unsuitable for wired-OR buses | Select only when system design mandates active-high push-pull reset signaling and no shared reset bus is used |
| TPS3808G15DBVR | Single-supply supervisor (monitors only VCC); 1.5V threshold, 200ms timeout, no VCC2 input or watchdog; SOT23-6 package | Lacks secondary supply monitoring and watchdog functionality; cannot replace dual-monitoring requirement of MAX6831VFUT+T | Use only as cost-optimized alternative in single-rail systems where VCC2 supervision and watchdog are omitted |
Compared with MAX6830VFUT+T and TPS3808G15DBVR, the MAX6831VFUT+T uniquely delivers open-drain RESET for bidirectional µP compatibility and true dual-rail supervision - critical for systems where independent core/I/O voltage validation and fail-safe watchdog coverage are mandatory.
Availability
MAX6831VFUT+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 across industrial temperature ranges.
Supply support for MAX6831VFUT+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 high-performance analog and mixed-signal semiconductor solutions for power, sensing, connectivity, and security applications.
The MAX6826–MAX6831 product line delivers ultra-low-voltage dual-supply microprocessor supervisors targeting battery-constrained and multivoltage embedded systems where reliability, small footprint, and guaranteed operation down to 1.0V are essential.
FAQ
What is the exact VCC reset threshold voltage for MAX6831VFUT+T?
The MAX6831VFUT+T has a factory-trimmed VCC reset threshold of 1.575V, with tolerance of ±25mV over the full –40°C to +125°C temperature range. This value is specified in the "Electrical Characteristics" table under "VCC Reset Threshold (VTH)" for suffix 'V', and applies to the primary supply monitoring function of the MAX6831VFUT+T.
Does MAX6831VFUT+T monitor a second voltage, and what is its threshold?
Yes, the MAX6831VFUT+T monitors a second voltage via the VCC2 pin with a factory-trimmed threshold of 1.575V (±25mV over –40°C to +125°C). Unlike the MAX6826–MAX6828 series, it does not support user-adjustable RESET IN; VCC2 is dedicated and fixed, as confirmed in the Selector Guide and Pin Description sections of the datasheet.
What type of RESET output does MAX6831VFUT+T provide, and how is it used?
The MAX6831VFUT+T provides an active-low open-drain RESET output (Pin 1). It requires an external pullup resistor and is designed for direct interfacing with microprocessors that have bidirectional reset I/O pins (e.g., Motorola 68HC11) or for wired-OR reset bus configurations. This differs from push-pull variants like MAX6830VFUT+T.
What is the watchdog timeout period for MAX6831VFUT+T, and how is it cleared?
The MAX6831VFUT+T features a nominal 1.6s watchdog timeout period (0.8s–2.6s over temperature). The internal timer is cleared by any rising or falling edge on the WDI pin (Pin 4), or automatically by assertion of RESET or MR. Leaving WDI unconnected disables the watchdog, as the internal driver services the timer every ~1.4s.
Is MAX6831VFUT+T guaranteed to operate down to VCC = +1.0V, and what does that mean for system design?
Yes, the MAX6831VFUT+T is guaranteed to assert a valid RESET signal down to VCC = +1.0V, as stated in the General Description and Absolute Maximum Ratings. This ensures reliable brownout detection and reset hold during deep supply droops - critical for battery-powered systems where voltage may fall below nominal operating range before shutdown.
MAX6831VFUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.05V, 1.58V
- 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
MAX6831VFUT+T FAQ
1.How can I place an order for MAX6831VFUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831VFUT+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 MAX6831VFUT+T reliable?
The price and inventory of MAX6831VFUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831VFUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831VFUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831VFUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831VFUT+T?
MAX6831VFUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831VFUT+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 MAX6831VFUT+T?
For technical support, including MAX6831VFUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831VFUT+T requirements.
6.How does Aetrix verify that MAX6831VFUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831VFUT+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 MAX6831VFUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831VFUT+T?
All MAX6831VFUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831VFUT+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 MAX6831VFUT+T part is unused and in its original packaging.
Return procedure for MAX6831VFUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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