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Analog Devices Inc./Maxim Integrated MAX6831YHUT-T
- Part No.:
- MAX6831YHUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6831YHUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6831YHUT-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 (2.188V threshold), manual reset input, and 1.6s watchdog timer. It monitors primary supply VCC (1.2–5.5V) and secondary supply VCC2 (0.9–2.5V), asserts reset on undervoltage or watchdog timeout, and guarantees valid reset operation down to VCC = +1.0V. Used in portable battery-powered equipment and multivoltage embedded systems.
For engineers reviewing the MAX6831YHUT-T datasheet, MAX6831YHUT-T pinout, MAX6831YHUT-T application, or MAX6831YHUT-T equivalent, key selection considerations include its open-drain RESET output compatibility with bidirectional µP reset pins, guaranteed operation at VCC ≥ 1.0V, factory-set 2.188V VCC2 threshold (Y suffix), and 140ms minimum reset timeout period across –40°C to +125°C.
Technical Context
The MAX6831YHUT-T implements dual independent voltage monitoring: a programmable primary VCC threshold (determined by part suffix) and a fixed secondary VCC2 threshold (2.188V for Y suffix). Its internal watchdog timer triggers reset if WDI remains static beyond 1.6s (min 0.8s, max 2.6s over temperature), and it clears on any WDI edge or MR assertion.
Reset assertion is OR-combined from VCC/VCC2 undervoltage, MR low, or watchdog timeout; reset remains asserted for ≥140ms after all conditions clear. The open-drain RESET output requires an external pullup and supports bidirectional µP reset interfaces without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | +1.2V to +5.5V at –40°C to +125°C; enables use with 1.2V, 1.8V, 2.5V, 3.3V, and 5V logic domains. |
| VCC2 Threshold (Y suffix) | +2.188V (typ), ±0.075V over –40°C to +125°C; factory-trimmed for precise 2.5V rail monitoring. |
| Reset Timeout Period | 140ms (min), 200ms (typ), 280ms (max); ensures sufficient µP initialization time after power stabilization. |
| Watchdog Timeout | 1.6s (nominal), 0.8s–2.6s over temperature; provides robust software execution monitoring in safety-critical firmware. |
| RESET Output Type | Open-drain active-low; allows wired-OR reset bus sharing and direct interface to bidirectional µP reset I/O (e.g., Motorola 68HC11). |
| Supply Current (VCC = +3.6V) | 25µA (max) at –40°C to +125°C; supports ultra-low-power battery operation in portable instrumentation. |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood and industrial embedded environments. |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant, lead-free option available as MAX6831YHUT+T.
| 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, timers, and logic; must be low-impedance connection. |
| 3 | MR | Manual reset input, active-low, with internal 50kΩ pullup to VCC; accepts CMOS levels; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input; toggling within 1.6s prevents reset; unconnected or high-impedance disables watchdog function. |
| 5 | VCC2 | Secondary supply input; monitored against fixed +2.188V threshold (Y suffix); no external components required. |
| 6 | VCC | Primary supply input; monitored against suffix-defined threshold (e.g., Y = 2.19V); powers internal circuitry and RSTIN comparator. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC (1.2–5.5V) and secondary VCC2 (0.9–2.5V) with separate thresholds and fault detection paths. |
| Factory-trimmed VCC2 threshold | 2.188V (Y suffix) with ±0.075V tolerance over full temperature range eliminates need for external resistor dividers. |
| Open-drain RESET output | Enables direct connection to bidirectional µP reset pins (e.g., 68HC11) and supports multi-source reset bus architectures. |
| Guaranteed reset validity to VCC = +1.0V | Ensures reliable reset assertion during deep brownout or ultra-low-voltage startup sequences without external support circuitry. |
| Immunity to short negative VCC transients | Withstands ≤20µs negative glitches down to 100mV below threshold without spurious reset-critical for noisy power rails. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld medical diagnostic device powered by single-cell Li-ion battery (2.7–4.2V) with 2.5V sensor interface rail. IC Role / Device Role / Timing Role: Monitors main VCC (3.3V LDO output) and 2.5V sensor rail (VCC2), asserts open-drain RESET to ARM Cortex-M0 during brownout or software hang. Use Value: Prevents corrupted sensor data acquisition and ensures deterministic recovery without external pullup conflicts on shared reset bus. |
Use Scenario: Industrial PLC module with dual 3.3V I/O and 1.8V core supplies, requiring watchdog supervision of real-time control firmware. IC Role / Device Role / Timing Role: Provides 1.6s watchdog timeout and 140ms reset hold time; MR pin enables front-panel reset button; open-drain RESET interfaces directly to µP bidirectional reset pin. Use Value: Eliminates need for discrete reset buffer or level shifter, reducing BOM count and PCB area in space-constrained controller modules. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable oscilloscope with 1.2V FPGA core, 2.5V ADC, and 3.3V display interface-all requiring coordinated power sequencing and fault detection. IC Role / Device Role / Timing Role: Supervises 3.3V VCC (T-suffix, 3.08V threshold) and 2.5V VCC2 (Y-suffix, 2.188V threshold); RESET output drives FPGA and µP simultaneously via pullup. Use Value: Single-chip dual-rail monitoring replaces two discrete supervisors, cutting cost and improving timing correlation between reset events. |
Use Scenario: Automotive engine control unit (ECU) with 5V MCU supply and 2.5V sensor reference, operating from –40°C to +125°C. IC Role / Device Role / Timing Role: Guarantees valid reset down to VCC = +1.0V during cranking; monitors both rails independently; withstands load-dump transients per ISO 7637. Use Value: Meets AEC-Q100 Grade 0 requirements for reset reliability in harsh automotive environments without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6830YHUT-T | Push-pull active-high RESET output instead of open-drain active-low; identical VCC/VCC2 thresholds and watchdog timing. | Requires level translation 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. |
| TPS3808G18DBVR | Single-supply supervisor (1.8V threshold only); no VCC2 monitor or watchdog; push-pull active-low RESET; 200ms timeout. | Lacks dual-rail monitoring and watchdog functionality; suitable only for basic VCC-only supervision. | Choose only if secondary rail monitoring and software watchdog are unnecessary and board space permits two devices. |
Compared with MAX6830YHUT-T and TPS3808G18DBVR, the MAX6831YHUT-T uniquely combines open-drain RESET for bidirectional µP compatibility, factory-trimmed dual-rail monitoring, and integrated watchdog-enabling single-chip supervision where others require multiple ICs or interface adaptations.
Availability
MAX6831YHUT-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 extended temperature ranges.
Supply support for MAX6831YHUT-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 power management ICs for demanding industrial, automotive, and computing applications.
The MAX6826–MAX6831 family delivers ultra-low-voltage dual-supply supervision with integrated watchdog and manual reset, targeting space-constrained, battery-sensitive embedded systems requiring high-reliability power-up/power-down sequencing.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6831YHUT-T?
The MAX6831YHUT-T has a factory-trimmed VCC2 reset threshold of +2.188V (typical), with a guaranteed range of +2.113V to +2.263V over the full operating temperature range of –40°C to +125°C. This value corresponds to the "Y" suffix in the part number and is optimized for monitoring standard 2.5V power rails without external components.
Does MAX6831YHUT-T support operation at VCC = +1.0V?
Yes, the MAX6831YHUT-T is guaranteed to assert a valid reset signal down to VCC = +1.0V across –40°C to +125°C. Its internal circuitry remains functional and the open-drain RESET output maintains specified sink capability (≥100µA) even at this ultra-low supply voltage, enabling reliable brownout detection in deep low-power states.
How does the watchdog timer in MAX6831YHUT-T function?
The MAX6831YHUT-T watchdog timer has a nominal timeout of 1.6s, with a guaranteed range of 0.8s to 2.6s over temperature. It resets on any rising or falling edge at the WDI pin and triggers reset if WDI remains static beyond timeout. When WDI is left unconnected, internal circuitry automatically services the timer every ~1.4s, effectively disabling watchdog supervision unless externally driven.
Can MAX6831YHUT-T monitor a 1.8V supply as VCC2?
No-MAX6831YHUT-T's VCC2 input is factory-trimmed to +2.188V (Y suffix) and is specified only for monitoring supplies between +0.9V and +2.5V. A 1.8V rail falls within that range but will not trigger reset until it drops below +2.113V (min threshold), making it unsuitable for precise 1.8V supervision. For 1.8V monitoring, select a variant with "W" (1.665V) or "V" (1.575V) suffix instead.
What package type and footprint does MAX6831YHUT-T use?
The MAX6831YHUT-T uses a 6-pin SOT23 package (outline U6+1, land pattern 90-0175), with 0.95mm pitch and standardized solder pad dimensions. It is RoHS-compliant and available in lead-free form as MAX6831YHUT+T. The pinout is fully compatible with industry-standard SOT23-6 footprints used for supervisory ICs and voltage detectors.
MAX6831YHUT-T 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, 2.19V
- 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
MAX6831YHUT-T FAQ
1.How can I place an order for MAX6831YHUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6831YHUT-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 MAX6831YHUT-T reliable?
The price and inventory of MAX6831YHUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6831YHUT-T is usually 5 days.
3.What payment methods are accepted for MAX6831YHUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6831YHUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6831YHUT-T?
MAX6831YHUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6831YHUT-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 MAX6831YHUT-T?
For technical support, including MAX6831YHUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6831YHUT-T requirements.
6.How does Aetrix verify that MAX6831YHUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6831YHUT-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 MAX6831YHUT-T meets industry standards.
7.What is the process for return or replacement of MAX6831YHUT-T?
All MAX6831YHUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6831YHUT-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 MAX6831YHUT-T part is unused and in its original packaging.
Return procedure for MAX6831YHUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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