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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:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
MAX6351TWUT from Maxim Integrated is a dual-voltage microprocessor supervisory IC with precision reset threshold monitoring for VCC1 and VCC2 supplies. It features two active-low push-pull reset outputs (RST1 referenced to VCC1, RST2 referenced to VCC2), 20µA supply current, 100ms minimum power-on reset pulse width, and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. It is used in multivoltage embedded systems requiring reliable power-up sequencing and fault detection.
For engineers reviewing the MAX6351TWUT datasheet, MAX6351TWUT pinout, MAX6351TWUT application, or MAX6351TWUT equivalent, this page delivers verified electrical parameters, exact SOT23-6 pin mapping, dual-threshold behavior (3.08V/1.67V), temperature-stable reset timing, and real-world design context for industrial controllers and battery-powered instrumentation.
Technical Context
The MAX6351TWUT implements independent voltage comparators for VCC1 and VCC2, asserting both RST1 and RST2 whenever either supply drops below its factory-set threshold (3.08V for VCC1, 1.67V for VCC2). Its internal glitch-filtered manual reset input (MR) debounces TTL/CMOS signals and forces reset while asserted.
No watchdog timer or third-voltage monitor is present - the MAX6351TWUT is strictly a dual-supply supervisor without WDI or RSTIN functionality. It operates across –40°C to +85°C and guarantees reset timeout of 100–280ms with full hysteresis and transient immunity up to 250µs at 1V overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±1.5% (factory-trimmed; enables precise +3.3V rail supervision) |
| VCC2 Threshold | 1.67V ±1.5% (factory-trimmed; supports +1.8V or +1.65V logic supply monitoring) |
| Supply Current | 20µA typical (enables ultra-low-power operation in battery-backed systems) |
| Reset Pulse Width | 100ms minimum (ensures reliable µP initialization across all operating temperatures) |
| Operating Temp | –40°C to +85°C (fully specified for industrial-grade embedded deployment) |
| Reset Output Type | Two active-low push-pull outputs (RST1@VCC1, RST2@VCC2; no external pull-up required) |
| RESET Valid Down To | VCC1 ≥ 1.0V or VCC2 ≥ 1.0V (guarantees reset assertion during brownout conditions) |
Pinout & Package
MAX6351TWUT is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA), with 1.0mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height. Pin 1 is RST1, Pin 2 is RST2, Pin 3 is MR, Pin 4 is GND, Pin 5 is VCC2, and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives low when VCC1 < 3.08V |
| 2 | RST2 | Active-low push-pull reset output referenced to VCC2; drives low when VCC2 < 1.67V |
| 3 | MR | Debounced manual reset input; active-low, CMOS-compatible, internal 32–100kΩ pullup |
| 4 | GND | Analog/digital ground reference for all comparators and outputs |
| 5 | VCC2 | Secondary supply input and monitored rail; powers internal circuitry when VCC2 > VCC1 |
| 6 | VCC1 | Primary supply input and monitored rail; powers internal circuitry when VCC1 > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset thresholds | Factory-set 3.08V (VCC1) and 1.67V (VCC2); eliminates need for external resistor dividers |
| Push-pull RST outputs | No external pull-up required; reduces BOM count and PCB area in dual-rail systems |
| Ultra-low quiescent current | 20µA typical; extends battery life in portable equipment and IoT edge nodes |
| Guaranteed reset validity | Outputs remain valid down to VCC1 = 1.0V or VCC2 = 1.0V - critical for brownout resilience |
| Power-supply transient immunity | Immune to transients ≤250µs at 1V overdrive - prevents false resets in noisy environments |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules powered by separate +3.3V logic and +1.8V FPGA core rails. IC Role / Device Role / Timing Role: Dual-voltage supervisor ensures synchronized reset assertion if either rail collapses during field operation. Use Value: Prevents partial initialization and state corruption in safety-critical control firmware. |
Use Scenario: Handheld glucose meters using +3.3V MCU and +1.65V sensor interface ASIC. IC Role / Device Role / Timing Role: Monitors both rails with matched 100ms reset pulse to guarantee clean boot before sensor calibration. Use Value: Eliminates need for discrete supervisors or custom reset logic, reducing size and qualification burden. |
| Battery-Powered Test Equipment | Multivoltage Industrial Sensors |
Use Scenario: Portable oscilloscope front-end powered by +5V analog, +3.3V digital, and +1.8V ADC rails. IC Role / Device Role / Timing Role: MAX6351TWUT supervises primary +3.3V and secondary +1.8V rails; third rail managed separately. Use Value: Enables single-chip reset coordination across two critical domains, simplifying layout and validation. |
Use Scenario: Smart pressure transmitter with +24V loop supply, +3.3V MCU, and +1.67V MEMS sensor bias. IC Role / Device Role / Timing Role: Supervises isolated low-voltage domains directly tied to sensor accuracy and communication integrity. Use Value: Provides deterministic reset behavior under wide temperature and load variations common in field 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 threshold = 3.08V, VCC2 threshold = 2.32V (vs. 1.67V); same package and pinout | Suitable for +3.3V/+2.5V systems instead of +3.3V/+1.8V; higher VCC2 trip invalidates use in 1.65V–1.8V domains | Select only when second rail is ≥2.3V; not interchangeable with MAX6351TWUT in low-voltage sensor interfaces. |
| TLV803EC26DBVR | Single-supply supervisor (2.63V threshold), SOT23-5, no dual-rail capability or push-pull RST2 | Requires two devices to replicate dual monitoring; lacks RST2 output and VCC2-referenced reset assertion | Use only in cost-sensitive, single-rail designs; cannot replace MAX6351TWUT in true dual-voltage coordination. |
Compared with MAX6351TZUT and TLV803EC26DBVR, the MAX6351TWUT uniquely provides matched 3.08V/1.67V thresholds in one SOT23-6 device with two independent push-pull outputs - enabling compact, robust reset management for mixed-voltage SoC and sensor subsystems without layout or firmware changes.
Availability
MAX6351TWUT is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, battery-powered test equipment, and multivoltage industrial sensors requiring stable component supply and long-term production continuity.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX6351–MAX6360 family was designed specifically for multivoltage microprocessor systems needing precise, low-power, dual-rail supervision with guaranteed reset validity across extended temperature ranges.
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 (±1.5%) and a VCC2 threshold of 1.67V (±1.5%). These values are laser-trimmed and fully specified over –40°C to +85°C. The "TW" suffix in MAX6351TWUT explicitly denotes this 3.08V/1.67V 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 (WDI) or adjustable third-voltage input (RSTIN). Those features are exclusive to other members of the MAX6351–MAX6360 family - specifically MAX6358–MAX6360 (WDI) and MAX6355–MAX6357 (RSTIN). The MAX6351TWUT is a dedicated dual-supply supervisor only.
What is the function of Pin 2 on the MAX6351TWUT, and how does it differ from Pin 1?
Pin 2 on the MAX6351TWUT is RST2 - an active-low push-pull reset output referenced to VCC2. It asserts when VCC2 falls below 1.67V. Pin 1 is RST1 - also active-low push-pull, but referenced to VCC1 and asserting when VCC1 falls below 3.08V. This dual-reference architecture allows independent reset signaling for two distinct power domains within one IC.
Can the MAX6351TWUT operate with VCC1 and VCC2 supplied from different sources, such as a battery and a DC-DC converter?
Yes. The MAX6351TWUT is explicitly designed for asynchronous dual-supply systems. VCC1 and VCC2 may be powered independently - e.g., VCC1 from a regulated +3.3V DC-DC converter and VCC2 from a +1.8V LDO fed by a lithium coin cell. The device guarantees valid RST1 and RST2 outputs as long as either supply remains ≥1.0V, supporting flexible power-architecture designs.
Is the MAX6351TWUT pin-compatible with other variants in the MAX6351–MAX6360 series?
Yes - all 6-pin variants (including MAX6351TWUT, MAX6351TZUT, MAX6355, MAX6358, etc.) share identical SOT23-6 pinouts per Maxim's Pin Description table. However, functional compatibility depends on feature set: only MAX6351-series parts provide two push-pull reset outputs; others offer open-drain, single-output, or added WDI/RSTIN functions. Always verify functional match, not just pinout.
MAX6351TWUT 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:
- 1.67V, 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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