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Analog Devices Inc./Maxim Integrated MAX6831SHUT
- Part No.:
- MAX6831SHUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831SHUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:923
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Product details
Overview
MAX6831SHUT from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in SOT23-6 package, monitoring primary supply (VCC) and secondary factory-trimmed supply (VCC2) down to +0.9V, with open-drain active-low RESET output, manual reset input (MR), and 1.6s watchdog timeout. It guarantees valid reset assertion down to VCC = +1.0V and supports critical brownout detection in battery-powered embedded systems.
For engineers reviewing the MAX6831SHUT datasheet, MAX6831SHUT pinout, MAX6831SHUT application, or MAX6831SHUT equivalent, key selection considerations include its open-drain RESET topology, dual-supply monitoring capability (VCC + VCC2), factory-trimmed 0.9V–2.5V secondary threshold, 140ms min reset timeout, and immunity to short negative VCC transients - all critical for reliable µP reset in multivoltage portable and automotive systems.
Technical Context
The MAX6831SHUT integrates two independent voltage comparators: one for primary VCC (programmable thresholds from 1.05V to 4.78V depending on suffix), and a second factory-trimmed comparator for VCC2 (0.9V–2.5V range). 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 across VCC undervoltage, VCC2 undervoltage, MR low, or watchdog timeout; the open-drain RESET output requires external pullup and remains asserted for ≥140ms after all fault conditions clear. The device operates from VCC = +1.2V to +5.5V and draws only 7–30µA typical supply current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | +1.2V to +5.5V - supports operation across wide input rails including Li-ion, 3.3V, and 5V systems |
| VCC2 Threshold | +0.9V (H-suffix) - factory-trimmed for accurate monitoring of low-voltage core supplies like 1.0V/1.2V logic |
| RESET Output Type | Open-drain active-low - enables wired-OR reset bus sharing and bidirectional µP reset I/O interfacing |
| Reset Timeout | ≥140ms - ensures stable power recovery before µP release, preventing premature boot in brownout scenarios |
| Watchdog Timeout | 1.6s nominal - provides robust software execution monitoring without excessive overhead |
| MR Input | Active-low with 50kΩ internal pullup - eliminates need for external resistor; supports momentary switch or CMOS logic |
| Operating Temp | −40°C to +125°C - qualified for automotive under-hood and industrial embedded environments |
Pinout & Package
SOT23-6 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead-free option available (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Open-drain active-low reset output - must be pulled up externally; sinks ≥1.2mA at VCC ≥ 2.55V |
| 2 | GND | Ground reference for all internal comparators and logic - requires low-impedance connection to system ground plane |
| 3 | MR | Manual reset input, active-low - internally pulled up to VCC (50kΩ); asserts reset when pulled ≤0.3×VCC |
| 4 | WDI | Watchdog input - resets internal 1.6s timer on rising or falling edge; disabled if left floating or three-stated |
| 5 | VCC2 | Secondary supply monitor input - connects directly to monitored low-voltage rail (e.g., 0.9V–2.5V core supply) |
| 6 | VCC | Primary supply input and power source - powers internal circuitry and sets reference for MR/WDI thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary (VCC) and secondary (VCC2) supplies with separate thresholds and hysteresis |
| Factory-trimmed VCC2 comparator | Eliminates external resistor divider for 0.9V–2.5V secondary rail monitoring - improves accuracy and reduces BOM count |
| Open-drain RESET with guaranteed sink | Sinks ≥1.2mA at VCC ≥ 2.55V - supports direct interface to bidirectional µP reset pins (e.g., Motorola 68HC11) |
| Immunity to VCC glitches | Withstands negative VCC transients ≤20µs at 100mV overdrive - prevents spurious resets in noisy power environments |
| No external components required | Integrates pullup on MR, precision references, timeout delay, and watchdog - reduces PCB area and design validation effort |
Applications
| Portable/Battery-Powered Equipment | Automotive Systems |
|---|---|
Use Scenario: Power management in handheld medical devices with dual-rail Li-ion battery (3.3V I/O + 1.2V core). IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to halt µP during battery sag below 2.8V (VCC) or 1.1V (VCC2), with 140ms holdoff for recovery. Use Value: Prevents corrupted memory writes and firmware crashes during transient brownouts, extending usable battery life per charge cycle. | Use Scenario: Engine control unit (ECU) monitoring 5V sensor supply and 1.8V microcontroller core rail. IC Role / Device Role / Timing Role: MAX6831SHUT monitors both rails and asserts RESET if either drops - e.g., due to alternator ripple or cold-cranking dip - with watchdog fallback for software lockup. Use Value: Ensures deterministic ECU restart under harsh automotive transients, meeting ISO 7637-2 pulse 4 immunity requirements. |
| Embedded Controllers | Critical µP Monitoring |
Use Scenario: Industrial PLC module with isolated 3.3V communication interface and 1.5V FPGA configuration rail. IC Role / Device Role / Timing Role: Supervises isolated VCC (3.3V) and FPGA VCC2 (1.5V) using factory-trimmed thresholds; MR tied to front-panel reset button. Use Value: Guarantees synchronized reset of µP and FPGA on power-up or operator-initiated reset - eliminating configuration mismatch and startup race conditions. | Use Scenario: Avionics data concentrator requiring fail-safe reset during rapid power cycling. IC Role / Device Role / Timing Role: MAX6831SHUT provides VCC/VCC2 monitoring with reset valid down to +1.0V and 1.6s watchdog - detecting both supply faults and software hangs. Use Value: Meets DO-254 functional safety requirements for deterministic reset initiation and recovery timing under single-point failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6829SHUT | Push-pull active-low RESET output; identical VCC/VCC2 monitoring and watchdog specs | Requires no external pullup; not suitable for wired-OR reset buses or bidirectional µP reset I/O | Select MAX6829SHUT when system uses dedicated reset line and lower drive strength suffices |
| TPS3808G18DBVR | Single-supply supervisor (VDD only); 1.8V fixed threshold; no VCC2 input or watchdog timer | Lacks dual-rail monitoring and software supervision - insufficient for systems requiring core+I/O rail coordination | Choose TPS3808G18DBVR only for simple single-rail applications where cost and footprint are prioritized over feature set |
Compared with MAX6829SHUT, MAX6831SHUT's open-drain output enables shared reset busing and bidirectional µP compatibility, while TPS3808G18DBVR omits critical dual-monitoring and watchdog functionality - making MAX6831SHUT uniquely suited for complex multivoltage systems demanding coordinated reset behavior.
Availability
MAX6831SHUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, automotive systems, and critical µP monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6831SHUT 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 power management ICs for high-reliability industrial, automotive, and communications applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-supply supervision in space-constrained portable and automotive systems - delivering guaranteed reset validity down to +1.0V with integrated watchdog and manual reset in 6-pin SOT23.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831SHUT?
The MAX6831SHUT uses the 'H' threshold suffix, specifying a factory-trimmed VCC2 reset threshold of +0.9V (min +0.762V, typ +0.788V, max +0.813V at −40°C to +125°C). This value is laser-trimmed during production and does not require external resistor networks - enabling precise monitoring of sub-1V core supplies without calibration.
Does MAX6831SHUT support bidirectional microprocessor reset pins?
Yes, MAX6831SHUT supports bidirectional µP reset pins via its open-drain RESET output. When interfaced with a pullup resistor, the MAX6831SHUT can assert active-low reset, and the µP can also drive the same line low to signal its own reset condition - as demonstrated in applications with Motorola 68HC11 and similar controllers.
What is the minimum VCC voltage at which MAX6831SHUT guarantees valid RESET assertion?
The MAX6831SHUT guarantees valid RESET assertion down to VCC = +1.0V across the full operating temperature range (−40°C to +125°C). Below this voltage, the internal comparators and logic may not function reliably - so system-level design must ensure VCC remains ≥+1.0V during reset assertion.
How is the watchdog timer cleared on MAX6831SHUT?
The watchdog timer on MAX6831SHUT is cleared by any rising or falling edge on the WDI pin. It is also automatically cleared whenever RESET is asserted (by VCC/VCC2 fault, MR, or prior watchdog timeout) or when MR is pulled low. No specific pulse width is required beyond the 50ns minimum specified for WDI transitions.
Can MAX6831SHUT monitor a 1.8V secondary supply?
Yes, MAX6831SHUT can monitor a 1.8V secondary supply - but only if ordered with the appropriate VCC2 threshold suffix. The 'SHUT' suffix corresponds to the 'H' threshold, which is trimmed for +0.9V. To monitor 1.8V, the correct part would be MAX6831SVUT (V-suffix = +1.575V) or MAX6831SWUT (W-suffix = +1.665V); MAX6831SHUT itself is not rated for 1.8V VCC2 monitoring.
MAX6831SHUT 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:
- 1.313V, 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-23-6
MAX6831SHUT FAQ
1.How can I place an order for MAX6831SHUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831SHUT 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 reliable?
The price and inventory of MAX6831SHUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831SHUT is usually 5 days.
3.What payment methods are accepted for MAX6831SHUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831SHUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831SHUT?
MAX6831SHUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831SHUT 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?
For technical support, including MAX6831SHUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831SHUT requirements.
6.How does Aetrix verify that MAX6831SHUT is sourced from the original manufacturer or authorized distributors?
All MAX6831SHUT 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 meets industry standards.
7.What is the process for return or replacement of MAX6831SHUT?
All MAX6831SHUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831SHUT, 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 part is unused and in its original packaging.
Return procedure for MAX6831SHUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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