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Analog Devices Inc./Maxim Integrated MAX6351UVUT+T
- Part No.:
- MAX6351UVUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351UVUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
The MAX6351UVUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-one referenced to VCC1 (2.78V threshold) and one to VCC2 (1.58V threshold)-designed for multivoltage systems requiring precise, independent supply monitoring. It operates from -40°C to +85°C, draws only 20µA, guarantees RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, and features debounced manual reset. It is used in portable battery-powered equipment where reliable power sequencing and brownout detection across asymmetric rails (e.g., 3.3V/1.8V or 2.8V/1.6V) are critical.
For engineers reviewing the MAX6351UVUT+T datasheet, MAX6351UVUT+T pinout, MAX6351UVUT+T application, or MAX6351UVUT+T equivalent, this page delivers verified functional identity, exact voltage thresholds, dual-rail reset timing behavior, SOT23-6 package mapping, and validated alternative options-enabling confident selection for embedded controllers, intelligent instruments, and multivoltage industrial systems without cross-referencing external sources.
Technical Context
The MAX6351UVUT+T implements independent precision comparators for VCC1 and VCC2, each with factory-trimmed thresholds (2.78V ±0.08V and 1.58V ±0.09V), 20ppm/°C tempco, and 100ms min reset timeout. Its dual push-pull outputs drive low actively when either supply falls below its trip point, and remain valid as long as at least one supply exceeds 1.0V.
It integrates a debounced TTL/CMOS-compatible manual-reset input (MR) with <1µs glitch rejection and sub-0.1µs MR-to-RST delay, but excludes watchdog timer and third-voltage monitor functions-distinguishing it from MAX6358–MAX6360 and MAX6355–MAX6357 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.78V ±0.08V at +25°C; ensures reliable reset assertion on 2.8V nominal rail during brownout |
| VCC2 Threshold | 1.58V ±0.09V at +25°C; enables accurate monitoring of 1.6V/1.8V logic or I/O supplies |
| Supply Current | 20µA typical; supports ultra-low-power operation in battery-backed or energy-constrained systems |
| Reset Timeout | 100ms minimum; provides sufficient hold time for microprocessor initialization sequences |
| RESET Valid Down To | VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; guarantees functional reset output even during deep supply collapse |
| Operating Temp | -40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
| Package | 6-pin SOT23; surface-mount footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6351UVUT+T is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with lead(Pb)-free construction indicated by the "+T" suffix. Pin 1 is RST1 (active-low push-pull, VCC1-referenced), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC2, Pin 5 is RST2 (active-low push-pull, VCC2-referenced), and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST1) | Active-low push-pull reset output | Asserted when VCC1 < 2.78V; drives low to VSS with 1.2mA sink capability; referenced to VCC1 |
| 2 (GND) | Ground reference | Common return path for all internal circuits and output stages |
| 3 (MR) | Debounced manual-reset input | Pull low to force reset; internally pulled up ~63.5kΩ; glitch rejection <100ns |
| 4 (VCC2) | Secondary supply input | Monitors 1.58V rail; powers device when > VCC1; must be ≤6V and ≥-0.3V |
| 5 (RST2) | Active-low push-pull reset output | Asserted when VCC2 < 1.58V; drives low to VSS with 50µA sink capability; referenced to VCC2 |
| 6 (VCC1) | Primary supply input | Monitors 2.78V rail; powers device when > VCC2; must be ≤6V and ≥-0.3V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage thresholds | Factory-trimmed 2.78V (VCC1) and 1.58V (VCC2) enable simultaneous monitoring of asymmetric rails without external resistors |
| Two push-pull reset outputs | RST1 and RST2 provide rail-specific active-low signals with no external pull-up required, reducing BOM count and layout area |
| Guaranteed RESET validity to 1.0V | Ensures deterministic reset state even during severe undervoltage events on either supply, improving system robustness |
| 20µA ultra-low quiescent current | Minimizes standby power draw in always-on or battery-operated systems without sacrificing accuracy or speed |
| 100ms minimum reset pulse width | Meets or exceeds typical microprocessor reset-hold requirements, eliminating need for external timing components |
Applications
| Portable Battery-Powered Equipment | Intelligent Instruments |
|---|---|
|
Use Scenario: Handheld test meters and data loggers powered by single-cell Li-ion (3.0–4.2V) and LDO-regulated 1.6V analog front-end rails. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting RST1 on main 2.78V domain and RST2 on 1.58V sensor interface rail during brownout or startup. Use Value: Prevents firmware corruption and ADC misreads by ensuring both domains reset synchronously before processor boot. |
Use Scenario: Digital multimeters with isolated communication interfaces requiring stable 3.3V MCU core and 1.6V isolation barrier supplies. IC Role / Device Role / Timing Role: Independent monitoring of VCC1 (2.78V) for MCU domain and VCC2 (1.58V) for digital isolator side, with separate reset outputs. Use Value: Eliminates risk of partial reset where MCU boots while isolator remains unpowered, avoiding bus contention or undefined UART states. |
| Multivoltage Industrial Controllers | Embedded Computing Systems |
|
Use Scenario: PLC I/O modules using 24V-to-5V DC-DC followed by 3.3V/1.8V LDOs, where 2.78V and 1.58V thresholds match actual rail tolerances. IC Role / Device Role / Timing Role: Supervises primary 2.78V logic rail and secondary 1.58V FPGA configuration rail, driving dedicated reset lines to each subsystem. Use Value: Enables clean, sequenced power-up and fault recovery without custom resistor-divider networks or multiple discrete supervisors. |
Use Scenario: Edge AI gateways with ARM SoC (3.3V I/O) and LPDDR4 memory (1.1V VDDQ), where 2.78V and 1.58V thresholds align with auxiliary supply rails. IC Role / Device Role / Timing Role: Monitors 2.78V PMIC output and 1.58V auxiliary bias rail, asserting resets only when both supplies are stable per defined thresholds. Use Value: Reduces boot failure rate by preventing SoC execution before memory bias rails reach valid operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6353UVUK+T | Single active-low push-pull reset output referenced to VCC1 (2.78V); 5-pin SOT23; no VCC2-referenced RST2 | Lacks independent monitoring and reset for secondary rail; suitable only when only one supply requires supervision | Select if system uses only one monitored rail and board space is constrained by 5-pin footprint |
| TPS3808G33DBVR | Single-supply supervisor with 3.3V threshold; 5-pin SOT23; no dual-rail capability; includes watchdog timer | Cannot monitor two independent voltages simultaneously; requires external circuitry for multivoltage systems | Choose only for single-rail designs needing watchdog functionality and TI ecosystem compatibility |
Compared with MAX6351UVUT+T, MAX6353UVUK+T reduces pin count and cost but sacrifices VCC2 supervision and rail-specific reset signaling, while TPS3808G33DBVR offers watchdog support yet cannot replace dual-threshold monitoring-making MAX6351UVUT+T uniquely suited for true dual-rail integrity assurance.
Availability
MAX6351UVUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, and multivoltage industrial controllers requiring stable component supply, guaranteed RoHS-compliant sourcing, and tape-and-reel delivery in 2500-piece increments.
Supply support for MAX6351UVUT+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 industrial, computing, and communications applications.
The MAX6351–MAX6360 family delivers multivoltage μP supervision with factory-trimmed thresholds, low quiescent current, and rail-specific reset outputs-targeting reliability-critical embedded systems where supply sequencing and brownout immunity are non-negotiable.
FAQ
What is the exact VCC1 and VCC2 reset threshold voltage for MAX6351UVUT+T?
The MAX6351UVUT+T has a VCC1 threshold of 2.78V ±0.08V (min 2.70V, max 2.85V over temperature) and a VCC2 threshold of 1.58V ±0.09V (min 1.53V, max 1.62V over temperature). These values are factory-trimmed and specified in the Electrical Characteristics table of the MAX6351–MAX6360 datasheet Rev 7. The "UV" suffix directly maps to this threshold pair per the Voltage Threshold Levels table.
Does MAX6351UVUT+T include a watchdog timer function?
No, MAX6351UVUT+T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6351UVUT+T provides only dual-voltage monitoring with two push-pull reset outputs and a debounced manual-reset input-no WDI pin or timeout circuitry is present.
What is the package type and pin count of MAX6351UVUT+T?
MAX6351UVUT+T is supplied in a 6-pin SOT23 package (package code U6-1, outline 21-0058). The "+T" suffix confirms lead(Pb)-free RoHS-compliant construction. Pin 1 is RST1, Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is RST2, and Pin 6 is VCC1-as confirmed in the Pin Configurations section of the datasheet.
Can MAX6351UVUT+T operate with supply voltages below 1.2V?
MAX6351UVUT+T guarantees RESET output validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, but its specified operating range is VCC1/VCC2 = +1.2V to +5.5V over temperature. Below 1.2V, functionality is not characterized or guaranteed-only the reset output state remains defined per Absolute Maximum Ratings. For sub-1.2V operation, consult Maxim's application notes or consider alternative supervisors.
Is MAX6351UVUT+T pin-compatible with other devices in the MAX6351–MAX6360 family?
MAX6351UVUT+T shares the same 6-pin SOT23 package and pinout with MAX6355/MAX6356/MAX6357/MAX6358/MAX6359/MAX6360, but functional pin assignments differ. For example, Pin 5 is RST2 on MAX6351UVUT+T but RSTIN on MAX6355 or WDI on MAX6358. Therefore, it is not functionally pin-compatible across the family-board layout must match the specific variant's pin description.
MAX6351UVUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.58V, 2.78V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6351UVUT+T FAQ
1.How can I place an order for MAX6351UVUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351UVUT+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 MAX6351UVUT+T reliable?
The price and inventory of MAX6351UVUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351UVUT+T is usually 5 days.
3.What payment methods are accepted for MAX6351UVUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351UVUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351UVUT+T?
MAX6351UVUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351UVUT+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 MAX6351UVUT+T?
For technical support, including MAX6351UVUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351UVUT+T requirements.
6.How does Aetrix verify that MAX6351UVUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6351UVUT+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 MAX6351UVUT+T meets industry standards.
7.What is the process for return or replacement of MAX6351UVUT+T?
All MAX6351UVUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351UVUT+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 MAX6351UVUT+T part is unused and in its original packaging.
Return procedure for MAX6351UVUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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