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Analog Devices Inc./Maxim Integrated MAX6831SHUT+T
- Part No.:
- MAX6831SHUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SHUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:270
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Product details
Overview
MAX6831SHUT+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 (0.9V–2.5V), manual reset input (MR), and 1.6s watchdog timer. It monitors primary supply VCC (1.8V–5.0V) and secondary supply VCC2 (0.9V–2.5V), asserts reset if either falls below threshold, and maintains reset for ≥140ms after recovery. Used in portable battery-powered equipment and multivoltage embedded systems requiring reliable power-up/down/brownout protection.
For engineers reviewing the MAX6831SHUT+T datasheet, MAX6831SHUT+T pinout, MAX6831SHUT+T application, or MAX6831SHUT+T equivalent, key selection criteria include its open-drain RESET output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), guaranteed reset validity down to VCC = +1.0V, immunity to short negative VCC transients, and factory-trimmed 0.9V–2.5V VCC2 monitoring without external components.
Technical Context
The MAX6831SHUT+T implements a dual-threshold supervision architecture: one precision comparator monitors VCC against a preprogrammed threshold (determined by suffix 'H' = 1.313V nominal at -40°C to +125°C), while a second factory-trimmed comparator monitors VCC2 (suffix 'H' = 1.313V). Its internal 1.6s watchdog timer clears on any WDI edge and triggers reset if no transition occurs within timeout.
Reset assertion is OR-combined from VCC undervoltage, VCC2 undervoltage, MR low, or watchdog timeout. The open-drain RESET output requires an external pullup and supports bidirectional µP reset I/O interfaces. All logic inputs (MR, WDI) feature internal 50kΩ pullups and CMOS-compatible thresholds (0.3×VCC/0.7×VCC).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 1.313V (nominal, H-suffix), ±0.045V over -40°C to +125°C - sets primary supply brownout detection point |
| VCC2 Threshold | 1.313V (nominal, H-suffix), ±0.045V over -40°C to +125°C - factory-trimmed secondary supply monitor, no resistor divider needed |
| Reset Timeout Period | 140ms (min), 320ms (max) over temperature - ensures µP remains held in reset long enough for stable power recovery |
| Watchdog Timeout | 1.6s (nominal), 0.8s–2.6s over -40°C to +125°C - provides software execution monitoring with wide temperature tolerance |
| Supply Current (VCC) | 25µA (max, -40°C to +125°C, VCC = +3.6V) - enables ultra-low-power operation in battery-critical applications |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and direct interface to bidirectional µP reset pins |
| Operating Voltage Range | VCC = +1.2V to +5.5V, VCC2 = +0.9V to +2.5V - supports modern low-voltage SoCs and multirail systems |
| Guaranteed Reset Validity | Down to VCC = +1.0V - ensures deterministic reset behavior even during deep brownout conditions |
Pinout & Package
MAX6831SHUT+T is housed in a RoHS-compliant 6-pin SOT23 package (package code U6+1, outline 21-0058), footprint-optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives low to assert system reset; requires external pullup; compatible with bidirectional µP reset I/O (e.g., 68HC11) |
| 2 - GND | Ground reference | Common return path for all internal circuitry and external monitoring networks |
| 3 - MR | Manual reset input (active-low) | Internal 50kΩ pullup to VCC; pulling low forces reset for ≥140ms after release; noise-immune with optional 0.1µF capacitor to GND |
| 4 - WDI | Watchdog input | Edge-sensitive; toggling clears 1.6s timer; left unconnected or three-stated disables watchdog; max leakage ±100nA over temp |
| 5 - VCC2 | Secondary supply voltage input | Factory-trimmed comparator input for monitoring +0.9V to +2.5V rails; no external components required |
| 6 - VCC | Primary supply voltage input | Power source and reference for internal circuitry; also monitored against H-suffix threshold (1.313V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneously supervises VCC (1.8V–5.0V) and VCC2 (0.9V–2.5V) with separate comparators and thresholds |
| Factory-trimmed VCC2 threshold | Eliminates need for external resistor divider when monitoring secondary rail - reduces BOM count and layout area |
| Open-drain RESET output | Enables direct connection to µPs with bidirectional reset I/O (e.g., Motorola 68HC11) using single external pullup resistor |
| 140ms minimum reset timeout | Ensures µP remains held in reset long enough for all power rails and clocks to stabilize post-brownout |
| Immunity to short VCC transients | Withstands negative-going VCC glitches ≤20µs at 100mV overdrive without spurious reset assertion |
| No external components required | Full supervision functionality achieved with zero external passive components - simplifies design and improves reliability |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitors powered by single-cell Li-ion batteries experiencing voltage sag under load. IC Role / Device Role / Timing Role: Dual-supply supervisor monitoring main 3.3V rail and ultra-low-voltage sensor interface rail (1.3V). Use Value: Prevents firmware crash during battery discharge by asserting reset before µP enters undefined state, leveraging guaranteed operation down to VCC = +1.0V. |
Use Scenario: Industrial PLC controller with separate 5V logic and 2.5V FPGA core supplies. IC Role / Device Role / Timing Role: Ensures synchronized reset of both domains during power-up and detects independent rail failures. Use Value: Eliminates need for two discrete supervisors; factory-trimmed VCC2 threshold removes calibration effort for 2.5V rail. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with segmented LCD, microcontroller, and analog front-end powered from dual rails. IC Role / Device Role / Timing Role: Monitors 3.0V main supply and 1.8V ADC reference supply; uses MR for user-initiated self-test reset. Use Value: Manual reset input with internal 50kΩ pullup enables pushbutton reset without external components; open-drain output isolates reset domain. |
Use Scenario: Medical infusion pump where µP failure could cause hazardous delivery errors. IC Role / Device Role / Timing Role: Provides fail-safe reset via VCC/VCC2 monitoring plus watchdog timer verifying software liveness. Use Value: 1.6s watchdog timeout with edge-triggered clear prevents stuck-loop failures; reset timeout ≥140ms exceeds µP power-on stabilization time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830SHUT+T | Push-pull active-high RESET output instead of open-drain active-low; 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 bidirectional interface is needed |
| MAX6829SHUT+T | Push-pull active-low RESET output; otherwise identical VCC/VCC2 thresholds, watchdog, and pinout | Cannot be wired-OR'd; incompatible with µPs requiring open-drain reset (e.g., 68HC11); higher drive strength | Select when driving a dedicated reset line with stronger sink capability and no shared bus requirement |
Compared with MAX6830SHUT+T and MAX6829SHUT+T, the MAX6831SHUT+T's open-drain RESET enables flexible reset bus architectures and direct integration with legacy µPs having bidirectional reset I/O, while maintaining identical supervision accuracy and watchdog reliability.
Availability
MAX6831SHUT+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 industrial temperature ranges (-40°C to +125°C).
Supply support for MAX6831SHUT+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 family delivers ultra-low-voltage dual-supply supervision for space- and power-constrained embedded systems, emphasizing guaranteed operation down to 1.0V VCC and factory-trimmed secondary rail monitoring.
FAQ
What is the VCC reset threshold voltage for MAX6831SHUT+T?
The MAX6831SHUT+T uses the 'H' threshold suffix, specifying a nominal VCC reset threshold of 1.313V at -40°C to +125°C, with min/max limits of 1.268V and 1.358V respectively. This value is factory-trimmed and guaranteed across temperature, enabling precise brownout detection for low-voltage microcontrollers and SoCs.
Does MAX6831SHUT+T monitor both primary and secondary supplies simultaneously?
Yes, MAX6831SHUT+T continuously monitors VCC (primary supply) and VCC2 (secondary supply) in parallel using independent comparators. VCC is compared against the H-suffix threshold (1.313V), while VCC2 is compared against the same factory-trimmed 1.313V threshold - allowing simultaneous supervision of two rails without external components.
What type of RESET output does MAX6831SHUT+T provide?
MAX6831SHUT+T provides an active-low open-drain RESET output on pin 1. This requires an external pullup resistor and enables wired-OR configurations, direct interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11), and isolation between reset domains - distinguishing it from push-pull variants like MAX6829SHUT+T and MAX6830SHUT+T.
How does the watchdog timer function in MAX6831SHUT+T?
The MAX6831SHUT+T features a 1.6s nominal watchdog timer that triggers reset if the WDI input (pin 4) remains static beyond timeout. The timer clears on any rising or falling edge at WDI. If WDI is left unconnected, internal circuitry pulses it every ~1.4s, effectively disabling the watchdog. Pulse width sensitivity is 50ns minimum.
Is MAX6831SHUT+T guaranteed to operate down to VCC = 1.0V?
Yes, MAX6831SHUT+T is fully specified and guaranteed to assert valid RESET output down to VCC = +1.0V across the full operating temperature range (-40°C to +125°C). This ensures deterministic reset behavior during deep brownout conditions where other supervisors may fail to respond.
MAX6831SHUT+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:
- 1.313V, 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
MAX6831SHUT+T FAQ
1.How can I place an order for MAX6831SHUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SHUT+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 MAX6831SHUT+T reliable?
The price and inventory of MAX6831SHUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SHUT+T is usually 5 days.
3.What payment methods are accepted for MAX6831SHUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SHUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SHUT+T?
MAX6831SHUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SHUT+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 MAX6831SHUT+T?
For technical support, including MAX6831SHUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SHUT+T requirements.
6.How does Aetrix verify that MAX6831SHUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6831SHUT+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 MAX6831SHUT+T meets industry standards.
7.What is the process for return or replacement of MAX6831SHUT+T?
All MAX6831SHUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SHUT+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 MAX6831SHUT+T part is unused and in its original packaging.
Return procedure for MAX6831SHUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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