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Analog Devices Inc./Maxim Integrated MAX6831SVUT+T
- Part No.:
- MAX6831SVUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SVUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,756
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Product details
Overview
MAX6831SVUT+T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory IC in SOT23-6 package, monitoring primary VCC (3.0V threshold) and secondary VCC2 (1.575V factory-trimmed threshold), with manual reset input, 1.6s watchdog timeout, open-drain active-low RESET output, and guaranteed operation down to VCC = +1.0V. It is used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6831SVUT+T datasheet, MAX6831SVUT+T pinout, MAX6831SVUT+T application, or MAX6831SVUT+T equivalent, key selection considerations include its fixed dual-supply monitoring thresholds (VTH = 3.08V, VTH2 = 1.575V), open-drain RESET output for bidirectional µP reset I/O compatibility, -40°C to +125°C operating range, and absence of user-adjustable RESET IN (unlike MAX6826–MAX6828).
Technical Context
The MAX6831SVUT+T implements a dual-threshold supervision architecture: one internal comparator monitors VCC against a factory-trimmed 3.08V threshold (S suffix), while a second comparator monitors VCC2 against a factory-trimmed 1.575V threshold (V suffix). It integrates a 1.6s watchdog timer cleared by WDI edge transitions and a manual reset input with internal 50kΩ pullup.
Its open-drain RESET output enables direct interface with microcontrollers having bidirectional reset pins (e.g., Motorola 68HC11) using a single external pullup resistor. The device asserts reset when VCC < 3.08V, VCC2 < 1.575V, MR is pulled low, or WDI fails to toggle within 1.6s - and holds reset for ≥140ms after all conditions clear.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V (S suffix), ±3% over -40°C to +125°C - sets primary supply brownout detection point for 3.3V systems |
| VCC2 Reset Threshold | 1.575V (V suffix), ±3% over -40°C to +125°C - factory-trimmed for core voltage monitoring in 1.8V/1.5V systems |
| Reset Timeout Period | 140ms minimum - ensures µP completes power-up initialization before release from reset |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over temp) - provides software execution monitoring without external timing components |
| RESET Output Type | Open-drain active-low - allows wired-OR reset bus and compatibility with bidirectional µP reset I/O pins |
| Operating Voltage Range | VCC = +1.2V to +5.5V - guarantees valid reset assertion down to 1.2V supply, enabling use in ultra-low-power wake-up circuits |
| Supply Current | 25µA max at -40°C to +125°C (VCC = +3.6V) - minimizes quiescent power in always-on battery monitoring paths |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant lead-free (+T suffix), -40°C to +125°C temperature grade.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; requires external pullup; sinks ≥100µA at VCC ≥ 1.2V |
| 2 | GND | Ground reference for all internal comparators, timer, and I/O |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC with 50kΩ; accepts CMOS levels |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears 1.6s timer on transition; disabled if floating |
| 5 | VCC2 | Secondary supply input; monitored against 1.575V threshold; not adjustable |
| 6 | VCC | Primary supply input; monitored against 3.08V threshold; powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneously supervises VCC (3.08V) and VCC2 (1.575V) with separate comparators - eliminates need for two discrete supervisors in multivoltage SoC designs |
| Open-drain RESET output | Enables direct connection to bidirectional µP reset pins (e.g., 68HC11) using one external pullup - simplifies PCB routing and supports reset bus sharing |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion during deep brownout or ultra-low-power wake-up - critical for fail-safe recovery in energy-harvesting systems |
| No external components required | Integrates precision voltage references, timer, pullup resistor, and comparators - reduces BOM count and board area vs. discrete solutions |
| Immunity to short negative VCC transients | Withstands ≤20µs negative glitches down to 100mV below threshold without spurious reset - improves noise robustness in electrically noisy environments |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitor powered by coin-cell battery with 3.3V I/O rail and 1.5V sensor core supply. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops during battery discharge or cold-temperature operation. Use Value: Prevents firmware crash due to undervoltage on either domain; open-drain RESET interfaces directly with ARM Cortex-M0+ bidirectional reset pin. |
Use Scenario: Industrial PLC controller with isolated 3.3V communication interface and 1.5V FPGA configuration supply. IC Role / Device Role / Timing Role: Monitors both supplies and triggers system-wide reset on failure, coordinated with watchdog timer for software hang detection. Use Value: Eliminates need for separate supervisors per rail; 140ms timeout ensures FPGA config completes before µP boot begins. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with dual-domain power: 3.3V analog front-end and 1.5V display driver. IC Role / Device Role / Timing Role: Ensures synchronized reset across domains during battery insertion or low-battery cutoff. Use Value: Factory-trimmed thresholds eliminate calibration overhead; SOT23-6 footprint saves space on compact instrument PCBs. |
Use Scenario: Medical infusion pump MCU requiring fail-safe reset on any supply anomaly during therapy delivery. IC Role / Device Role / Timing Role: Primary safety element verifying VCC and VCC2 integrity before enabling motor drivers and sensors. Use Value: Guaranteed operation down to VCC = +1.0V ensures reset remains valid during rapid battery depletion; watchdog detects firmware lockup mid-dose. |
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 |
|---|---|---|---|
| MAX6830SVUT+T | Push-pull active-high RESET output instead of open-drain active-low; identical VCC/VCC2 thresholds and watchdog timing | Requires level-shifting or redesign for µPs with active-low reset inputs; unsuitable for wired-OR reset buses | Select MAX6830SVUT+T only when interfacing with µPs requiring active-high reset assertion and no shared reset bus |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitor; fixed 200ms reset timeout; different watchdog behavior (windowed vs. simple timeout) | Cannot replace dual-monitoring function without adding external resistor divider or second supervisor IC | Use TPS3808G33DBVR only in single-rail systems where secondary supply monitoring is handled separately |
Compared with MAX6831SVUT+T, MAX6830SVUT+T offers push-pull active-high reset but loses open-drain flexibility, while TPS3808G33DBVR lacks VCC2 monitoring entirely - making MAX6831SVUT+T uniquely suited for compact dual-rail brownout protection with bidirectional µP compatibility.
Availability
MAX6831SVUT+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 automotive, industrial, and medical end markets.
Supply support for MAX6831SVUT+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 ICs for demanding industrial, medical, and communications applications.
The MAX6826–MAX6831 family delivers ultra-low-voltage dual-supply supervision in miniature SOT23 packages, targeting space-constrained, battery-operated systems where simultaneous monitoring of primary and core supplies is essential for functional safety.
FAQ
What is the exact VCC and VCC2 reset threshold voltage for MAX6831SVUT+T?
The MAX6831SVUT+T has a VCC reset threshold of 3.08V (S suffix) and a VCC2 reset threshold of 1.575V (V suffix), both factory-trimmed and guaranteed over -40°C to +125°C with ±3% tolerance. These values are specified in the Threshold Suffix Guide and Electrical Characteristics table of the MAX6826–MAX6831 datasheet. The MAX6831SVUT+T does not support user-adjustable RESET IN - its secondary monitor is fixed to VCC2.
Does MAX6831SVUT+T support adjustable reset threshold for the secondary supply?
No, MAX6831SVUT+T does not support adjustable reset threshold for the secondary supply. Unlike MAX6826–MAX6828, which feature a RESET IN pin for user-defined thresholds, the MAX6831SVUT+T uses a factory-trimmed VCC2 input with fixed 1.575V threshold. Pin 5 is dedicated to VCC2 monitoring only; connecting an external resistor divider to it will not alter the trip point and may impair functionality.
What is the reset output configuration of MAX6831SVUT+T and how does it interface with microcontrollers?
The MAX6831SVUT+T features an open-drain active-low RESET output (Pin 1). This allows direct interface with microcontrollers having bidirectional reset I/O pins (e.g., Motorola 68HC11) using a single external pullup resistor. The output sinks ≥100µA when asserted and floats high when inactive, enabling wired-OR reset bus configurations and eliminating level-shifting requirements in mixed-voltage systems.
What is the watchdog timeout period for MAX6831SVUT+T and how is it cleared?
The MAX6831SVUT+T has a nominal watchdog timeout period of 1.6s (range 0.8s–2.6s over temperature). The internal timer is cleared by any rising or falling edge on the WDI pin (Pin 4), by assertion of MR, or by assertion of RESET. If WDI remains static beyond the timeout, a reset pulse is generated and held for ≥140ms. Leaving WDI unconnected disables the watchdog function.
Is MAX6831SVUT+T guaranteed to operate down to VCC = +1.0V, and what does that mean for system design?
Yes, MAX6831SVUT+T is guaranteed to assert a valid reset signal down to VCC = +1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections. This means the device maintains correct comparator and timer operation during severe brownout conditions, ensuring fail-safe reset even as the primary supply collapses - a critical capability for energy-harvesting or ultra-low-power wake-up circuits where supply may dip near 1V.
MAX6831SVUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.575V, 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
MAX6831SVUT+T FAQ
1.How can I place an order for MAX6831SVUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SVUT+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 MAX6831SVUT+T reliable?
The price and inventory of MAX6831SVUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SVUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831SVUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SVUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SVUT+T?
MAX6831SVUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SVUT+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 MAX6831SVUT+T?
For technical support, including MAX6831SVUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SVUT+T requirements.
6.How does Aetrix verify that MAX6831SVUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831SVUT+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 MAX6831SVUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831SVUT+T?
All MAX6831SVUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SVUT+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 MAX6831SVUT+T part is unused and in its original packaging.
Return procedure for MAX6831SVUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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