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Analog Devices Inc./Maxim Integrated MAX6351TWUT+
- Part No.:
- MAX6351TWUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351TWUT+.pdf
- Description:
- MAX6351 DUAL-VOLTAGE MICROPROCES
- Quantity:
- Payment:
- Shipping:
Inventory:389
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Product details
Overview
MAX6351TWUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory IC with precision reset thresholds of 3.08V on VCC1 and 1.67V on VCC2, active-low push-pull RST1 (VCC1-referenced) and RST2 (VCC2-referenced) outputs, 20µA supply current, and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. It enables reliable power-on reset and supply monitoring in multivoltage embedded systems such as portable instrumentation and industrial controllers.
For engineers reviewing the MAX6351TWUT+ datasheet, MAX6351TWUT+ pinout, MAX6351TWUT+ application, or MAX6351TWUT+ equivalent, key selection considerations include its dual-supply threshold pairing (3.08V/1.67V), SOT23-6 package, -40°C to +85°C operation, push-pull reset architecture, and absence of watchdog or third-voltage monitor functionality.
Technical Context
The MAX6351TWUT+ implements independent voltage comparators for VCC1 and VCC2, asserting both RST1 and RST2 simultaneously when either supply falls below its factory-set threshold. Its reset logic guarantees output validity as long as at least one supply remains ≥1.0V, enabling robust brownout detection during asymmetric supply sequencing.
No internal watchdog timer or adjustable RSTIN input is present - this variant belongs to the base MAX6351 family subset defined by dual push-pull outputs and fixed dual-threshold monitoring only. All timing parameters (e.g., 100ms min reset pulse width, 20µs VCC-to-reset delay) are fully specified over temperature without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±3% (factory-trimmed; ensures precise +3.3V rail supervision) |
| VCC2 Threshold | 1.67V ±3% (factory-trimmed; enables accurate +1.8V or +1.6V core voltage monitoring) |
| Supply Current | 20µA max (enables battery-backed operation for >10 years in low-power systems) |
| Reset Pulse Width | 100ms minimum (guarantees sufficient duration for µP initialization across all conditions) |
| Operating Temp | -40°C to +85°C (fully specified for industrial and extended-temperature applications) |
| RESET Validity | Valid down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V (ensures deterministic reset assertion during deep brownout) |
| Output Type | Two active-low push-pull outputs (RST1 referenced to VCC1, RST2 to VCC2; no external pull-up required) |
Pinout & Package
MAX6351TWUT+ is housed in a 6-pin SOT23-6 package with 1.6mm × 2.9mm footprint and 0.95mm height, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives low when VCC1 < 3.08V or VCC2 < 1.67V |
| 2 | GND | Analog/digital ground reference for internal comparators and output drivers |
| 3 | MR | Debounced active-low manual reset input; forces RST1/RST2 low when pulled ≤0.3×VCC1 |
| 4 | VCC2 | Secondary supply input and monitored rail; powers internal circuitry when VCC2 > VCC1 |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; asserted concurrently with RST1 |
| 6 | VCC1 | Primary supply input and monitored rail; powers internal circuitry when VCC1 > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of two distinct rails (e.g., I/O + core) with no shared reference dependency |
| Factory-trimmed precision thresholds | ±3% accuracy over temperature eliminates need for external calibration or trimming resistors |
| Push-pull reset outputs | Eliminates external pull-up resistors and reduces BOM count in space-constrained designs |
| Low quiescent current | 20µA max enables integration into always-on subsystems without compromising battery life |
| Guaranteed reset validity to 1.0V | Ensures deterministic reset behavior during severe brownout events where supplies dip near cutoff |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered handheld diagnostic sensor with separate +3.3V analog front-end and +1.8V digital core. IC Role / Device Role / Timing Role: Dual-voltage supervisor ensuring synchronized reset of both domains during battery sag or cold start. Use Value: Prevents partial initialization and firmware lockup by guaranteeing simultaneous RST1/RST2 assertion when either rail drops below 3.08V or 1.67V. | Use Scenario: DIN-rail mounted programmable logic controller with isolated +24V field power and +3.3V logic supply. IC Role / Device Role / Timing Role: Supervises auxiliary +3.3V logic rail and internal +1.8V FPGA core voltage under EMI-prone industrial environments. Use Value: 20µA supply current and -40°C to +85°C rating support unattended operation in harsh enclosures without thermal derating. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Low-voltage automotive subsystem powered from 12V battery via dual DC-DC converters delivering +3.3V MCU rail and +1.6V transceiver rail. IC Role / Device Role / Timing Role: Monitors both regulated rails for undervoltage faults during cranking or load dump recovery. Use Value: Reset pulse width ≥100ms satisfies automotive MCU reset timing requirements while push-pull outputs drive heavy capacitive loads directly. | Use Scenario: Revenue-grade electricity meter with isolated +5V metrology rail and +1.8V real-time clock domain. IC Role / Device Role / Timing Role: Ensures atomic reset of timekeeping and measurement subsystems during AC mains interruption. Use Value: Guaranteed RESET validity down to VCC ≥1.0V prevents RTC corruption during brief brownouts common in grid-edge deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6351TZUT+ | VCC1 = 3.08V, VCC2 = 2.32V (higher second threshold) | Suitable for +3.3V/+2.5V dual-rail systems instead of +3.3V/+1.8V | Select when monitoring higher secondary rail voltages; not drop-in for 1.67V threshold requirement |
| TPS3808G33DBVR | Single-supply (3.3V only), open-drain output, 2% threshold accuracy, 1.6µA IQ | Lacks dual-rail capability and push-pull drive; requires external pull-up | Use only if system has single monitored rail and ultra-low IQ is critical; not functionally equivalent |
Compared with MAX6351TWUT+, MAX6351TZUT+ provides identical dual-push-pull architecture but targets +3.3V/+2.5V systems, whereas TPS3808G33DBVR offers lower power but sacrifices dual monitoring, push-pull drive, and precise 1.67V threshold - making it unsuitable as a direct replacement.
Availability
MAX6351TWUT+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6351TWUT+ 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 and mixed-signal ICs for industrial, automotive, communications, and computing markets.
The MAX6351–MAX6360 family delivers highly integrated, low-power supervisory solutions for multivoltage microprocessor systems requiring guaranteed reset timing and supply fault detection without external components.
FAQ
What is the exact reset threshold voltage for each supply on the MAX6351TWUT+?
The MAX6351TWUT+ has a factory-set VCC1 threshold of 3.08V (±3%) and a VCC2 threshold of 1.67V (±3%). These values are laser-trimmed during production and fully specified over the -40°C to +85°C operating range. The "TW" suffix in MAX6351TWUT+ directly maps to this specific dual-threshold combination per Maxim's Voltage Threshold Levels table.
Does the MAX6351TWUT+ include a watchdog timer or third-voltage monitor?
No, the MAX6351TWUT+ does not include a watchdog timer or adjustable third-voltage monitor input. It belongs to the base MAX6351 variant group, which provides only dual-supply monitoring with two push-pull reset outputs. Watchdog functionality is exclusive to MAX6358/MAX6359/MAX6360 variants, and the RSTIN input for third-voltage monitoring appears only on MAX6355/MAX6356/MAX6357.
What is the package type and pin configuration of the MAX6351TWUT+?
The MAX6351TWUT+ uses a 6-pin SOT23-6 package with standard pinout: Pin 1 = RST1, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = RST2, Pin 6 = VCC1. This matches the functional diagram and pin description for MAX6351 in the official datasheet, and the "UT" in the part number denotes the SOT23-6 packaging variant.
How does the MAX6351TWUT+ ensure reset validity during deep brownout conditions?
The MAX6351TWUT+ guarantees valid reset output states as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a specification explicitly confirmed in the Absolute Maximum Ratings and Detailed Description sections. This allows deterministic reset assertion even when supplies collapse far below nominal levels, preventing undefined µP behavior during severe undervoltage events.
Can the MAX6351TWUT+ be used in battery-powered applications with strict current budgets?
Yes, the MAX6351TWUT+ draws only 20µA maximum supply current across temperature, making it well-suited for battery-powered applications. Its low quiescent current enables multi-year operation on coin cells or primary lithium batteries, especially when paired with sleep-mode µPs. No external components are needed, further reducing standby power contributions from passive networks.
MAX6351TWUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.67V, 3.08V
- 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-23-6
MAX6351TWUT+ FAQ
1.How can I place an order for MAX6351TWUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351TWUT+ 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 MAX6351TWUT+ reliable?
The price and inventory of MAX6351TWUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351TWUT+ is usually 5 days.
3.What payment methods are accepted for MAX6351TWUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351TWUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351TWUT+?
MAX6351TWUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351TWUT+ 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 MAX6351TWUT+?
For technical support, including MAX6351TWUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351TWUT+ requirements.
6.How does Aetrix verify that MAX6351TWUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6351TWUT+ 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 MAX6351TWUT+ meets industry standards.
7.What is the process for return or replacement of MAX6351TWUT+?
All MAX6351TWUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351TWUT+, 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 MAX6351TWUT+ part is unused and in its original packaging.
Return procedure for MAX6351TWUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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