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Analog Devices Inc./Maxim Integrated MAX6351UVUT+
- Part No.:
- MAX6351UVUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351UVUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX6351UVUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs (RST1 referenced to VCC1, RST2 to VCC2), factory-set precision thresholds of 2.78V (VTH1) and 1.58V (VTH2), 20µA supply current, and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used in multivoltage embedded systems requiring reliable power-on and brownout detection.
For engineers reviewing the MAX6351UVUT+ datasheet, MAX6351UVUT+ pinout, MAX6351UVUT+ application, or MAX6351UVUT+ equivalent, key selection criteria include dual-supply threshold accuracy, push-pull output drive capability per rail, manual-reset debouncing, temperature-stable reset timeout (100–280ms), and SOT23-6 package compatibility with space-constrained industrial controllers and portable equipment.
Technical Context
The MAX6351UVUT+ implements independent voltage comparators for VCC1 and VCC2, asserting both RST1 and RST2 simultaneously if either supply falls below its respective threshold. Its internal glitch filter rejects transients ≤100ns on MR and supports valid reset assertion even when only one supply remains above +1.0V.
Unlike watchdog-equipped variants (e.g., MAX6359), the MAX6351UVUT+ lacks WDI functionality and third-voltage monitoring (RSTIN); it is strictly a dual-rail supervisor with no timer or adjustable comparator inputs. Its reset timeout is fixed at 100ms minimum, with hysteresis of VTH/500 and tempco of 20ppm/°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold (VTH1) | 2.78V ±0.04V at +25°C; guarantees reset assertion when primary supply drops below this level, with ±0.08V tolerance over -40°C to +85°C |
| VCC2 Threshold (VTH2) | 1.58V ±0.03V at +25°C; enables precise monitoring of secondary low-voltage rails such as 1.8V or 1.5V logic supplies |
| Supply Current | 20µA typical at VCC1=5.5V/VCC2=3.6V; ensures minimal loading on battery-backed or ultra-low-power systems |
| Reset Timeout Period | 100ms minimum pulse width; meets standard μP reset hold-time requirements without external timing components |
| RESET Output Type | Two active-low push-pull outputs: RST1 referenced to VCC1, RST2 to VCC2; eliminates need for external pull-ups and supports direct CMOS interface |
| Operating Temperature | -40°C to +85°C extended range; qualified for industrial and automotive under-hood environments where thermal stability is critical |
| Package | 6-pin SOT23; footprint-compatible with industry-standard PCB layouts and reflow processes, with 1.6mm × 2.9mm body size |
Pinout & Package
MAX6351UVUT+ is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with exposed pad not electrically connected. The device uses a standard top-view pin numbering scheme and operates with no external passive components required for basic supervision.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives low to reset host processor powered by VCC1 rail |
| 2 | GND | Ground reference for all internal comparators and output drivers; must be connected to system common ground plane |
| 3 | MR | Debounced manual-reset input; pulling low forces both RST1 and RST2 active; internally pulled up ~63.5kΩ to VCC1 |
| 4 | VCC2 | Secondary supply input and monitor rail; powers internal circuitry when VCC2 > VCC1 and triggers RST2 if VCC2 < 1.58V |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; asserts reset on peripherals or subsystems powered by VCC2 |
| 6 | VCC1 | Primary supply input and monitor rail; powers internal circuitry when VCC1 > VCC2 and triggers RST1 if VCC1 < 2.78V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of two non-identical rails (e.g., 2.8V core + 1.6V I/O) with separate, factory-trimmed thresholds and push-pull outputs |
| Guaranteed reset validity down to 1.0V | Both RST1 and RST2 remain asserted and logically valid as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - critical for graceful shutdown in brownout conditions |
| Low quiescent current | 20µA typical supply draw enables integration into always-on battery-powered systems without compromising runtime |
| Integrated MR debounce | Hardware-based filtering rejects noise spikes <100ns on manual-reset line, eliminating need for external RC networks or firmware debouncing |
| No external components required | Complete dual-rail supervision implemented in single 6-pin SOT23 IC - reduces BOM count, board area, and qualification effort versus discrete solutions |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
|
Use Scenario: A programmable logic controller uses separate 2.8V FPGA core and 1.6V I/O banks, requiring coordinated reset during power-up and brownout events. IC Role / Device Role / Timing Role: MAX6351UVUT+ monitors both rails independently and asserts RST1 (to FPGA) and RST2 (to I/O buffer) simultaneously upon any fault, ensuring deterministic state recovery. Use Value: Eliminates risk of metastability or partial initialization by guaranteeing synchronized reset across voltage domains with no software dependency. |
Use Scenario: A handheld ECG device operates from a single Li-ion cell (2.8V–4.2V) with LDOs generating 2.78V analog front-end and 1.58V digital logic rails. IC Role / Device Role / Timing Role: MAX6351UVUT+ provides rail-specific reset signaling: RST1 holds ADC chain in reset until analog supply stabilizes; RST2 releases microcontroller only after digital rail is valid. Use Value: Prevents data corruption during battery sag by enforcing strict sequencing - analog path initialized before digital processing begins. |
| Automotive Body Control Module | Networked Sensor Hub |
|
Use Scenario: A BCM integrates CAN transceiver (5V), MCU (3.3V), and LIN interface (1.6V), all sharing a common 12V-to-5V/3.3V/1.6V power tree. IC Role / Device Role / Timing Role: MAX6351UVUT+ supervises the 3.3V MCU rail (VCC1 = 3.3V, VTH1 = 2.78V) and 1.6V LIN rail (VCC2 = 1.6V, VTH2 = 1.58V), asserting resets only when each rail breaches its margin. Use Value: Enables selective reset - CAN transceiver remains operational during minor 1.6V droop, while MCU resets cleanly to prevent bus arbitration errors. |
Use Scenario: An IoT sensor node aggregates temperature, humidity, and motion data using separate 2.8V sensor bias and 1.5V RF SoC supplies. IC Role / Device Role / Timing Role: MAX6351UVUT+ acts as centralized supervisor: RST1 disables sensor acquisition if 2.8V rail fails; RST2 halts BLE transmission if 1.5V RF supply drops. Use Value: Avoids false readings or radio collisions by ensuring sensors and transceiver are only enabled when both supplies meet precision thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6353UVUT+ | Single active-low push-pull RST output referenced to VCC1 only; no RST2; same VTH1/VTH2 thresholds and SOT23-6 package | Suitable when only primary rail reset is needed and secondary rail does not require dedicated reset signaling | Select MAX6353UVUT+ to reduce pin count and simplify layout where RST2 functionality is unused |
| TLV809E27DBZR | Single-supply supervisor with 2.7V threshold, open-drain RST, 5-pin SOT23, no VCC2 monitoring or dual-output capability | Limited to single-rail systems; requires external pull-up and cannot supervise two independent voltages | Choose TLV809E27DBZR only for cost-sensitive, single-rail designs where dual monitoring is unnecessary |
Compared with MAX6353UVUT+, the MAX6351UVUT+ adds a second push-pull reset output (RST2) for independent control of secondary-rail peripherals, enabling true dual-domain sequencing; compared with TLV809E27DBZR, it delivers integrated dual-threshold supervision without external components or layout compromises.
Availability
MAX6351UVUT+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6351UVUT+ 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 ICs for industrial, communications, computing, and consumer applications, with emphasis on reliability, integration, and power efficiency.
The MAX6351–MAX6360 family was engineered specifically for multivoltage embedded systems needing precise, low-power, dual-rail supervision without external timing or bias components - targeting space-constrained and thermally demanding applications.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351UVUT+?
The MAX6351UVUT+ has factory-set thresholds of 2.78V (VTH1) for VCC1 and 1.58V (VTH2) for VCC2, with tolerances of ±0.04V and ±0.03V respectively at +25°C. Over the full -40°C to +85°C range, VTH1 remains within 2.70V–2.85V and VTH2 within 1.53V–1.62V, as specified in the Electrical Characteristics table.
Does the MAX6351UVUT+ include a watchdog timer function?
No, the MAX6351UVUT+ does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants in the family. The MAX6351UVUT+ is a pure dual-voltage supervisor with manual reset and two independent push-pull reset outputs - no WDI pin or timeout circuitry is present.
Can the MAX6351UVUT+ operate with only one supply voltage active?
Yes, the MAX6351UVUT+ guarantees valid reset output states as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. This allows operation during asymmetric power sequencing or brownout conditions where one rail collapses while the other remains marginally functional - a key reliability feature confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections.
What is the reset pulse width specification for the MAX6351UVUT+?
The MAX6351UVUT+ provides a minimum reset pulse width of 100ms, with typical values of 180ms and a maximum of 280ms under nominal conditions. This fixed timeout is internally generated and requires no external capacitor, ensuring consistent reset hold time across temperature and voltage variations without design iteration.
Is the MAX6351UVUT+ pin-compatible with other devices in the MAX6351–MAX6360 family?
The MAX6351UVUT+ uses the 6-pin SOT23 package and shares identical pinout with MAX6355/MAX6356/MAX6357/MAX6358/MAX6359/MAX6360 variants. However, pin functions differ: MAX6351UVUT+ uses Pin 5 as RST2, whereas MAX6355 uses it as RSTIN and MAX6358 as WDI - direct substitution is not electrically safe without verifying peripheral connectivity and firmware assumptions.
MAX6351UVUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX6351UVUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351UVUT+ 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+ reliable?
The price and inventory of MAX6351UVUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351UVUT+ is usually 5 days.
3.What payment methods are accepted for MAX6351UVUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351UVUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351UVUT+?
MAX6351UVUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351UVUT+ 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+?
For technical support, including MAX6351UVUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351UVUT+ requirements.
6.How does Aetrix verify that MAX6351UVUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6351UVUT+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6351UVUT+?
All MAX6351UVUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351UVUT+, 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+ part is unused and in its original packaging.
Return procedure for MAX6351UVUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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