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Analog Devices Inc./Maxim Integrated MAX6351TZUT
- Part No.:
- MAX6351TZUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351TZUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6351TZUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-one referenced to VCC1 (3.08V threshold) and one to VCC2 (2.32V threshold)-designed for multivoltage systems requiring precise, independent supply monitoring. It operates over –40°C to +85°C, draws only 20µA, and guarantees RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. Used in portable battery-powered equipment where reliable power sequencing and brownout detection are critical.
For engineers reviewing the MAX6351TZUT datasheet, MAX6351TZUT pinout, MAX6351TZUT application, or MAX6351TZUT equivalent, this page delivers verified functional identity, exact voltage thresholds, dual-supply reset behavior, watchdog-free architecture, and SOT23-6 package compatibility-enabling rapid integration into embedded power management designs without manual-reset timing ambiguity or external component dependencies.
Technical Context
The MAX6351TZUT implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 3.08V ±0.08V, VTH2 = 2.32V ±0.07V), each driving a dedicated push-pull output (RST1 referenced to VCC1, RST2 to VCC2). Reset assertion occurs if either supply drops below its respective threshold, and both outputs remain valid as long as at least one supply exceeds +1.0V.
No watchdog timer or third-voltage monitor is present-this variant belongs to the base MAX6351 family subset lacking WDI and RSTIN pins. Its reset timeout period is fixed at 100ms minimum, with 20µA quiescent current and guaranteed operation across the full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±0.08V @ -40°C to +85°C - precisely monitors +3.3V rail with 2.5% tolerance, enabling robust brownout detection before system instability. |
| VCC2 Threshold | 2.32V ±0.07V @ -40°C to +85°C - targets +2.5V or +2.3V logic rails, ensuring safe reset during low-voltage transients on auxiliary supplies. |
| Supply Current | 20µA typical - enables ultra-low-power operation in battery-backed or energy-constrained systems without compromising supervision integrity. |
| Reset Pulse Width | 100ms minimum - meets μP reset hold-time requirements for reliable initialization across ARM, PIC, and MSP430 families. |
| Operating Temp | -40°C to +85°C - fully specified for industrial and automotive under-hood environments without derating or external compensation. |
| RESET Validity | Down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - ensures deterministic reset state even during deep brownout or partial power loss scenarios. |
| Package | 6-pin SOT23 - surface-mount footprint compatible with high-density PCB layouts and automated assembly processes. |
Pinout & Package
MAX6351TZUT is housed in a 6-pin SOT23 package (package code U6-1), with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad not present. Pin 1 is RST1 (active-low push-pull, VCC1-referenced); Pin 2 is GND; Pin 3 is MR (debounced manual-reset input); Pin 4 is VCC2; Pin 5 is RST2 (active-low push-pull, VCC2-referenced); Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST1) | Active-low push-pull reset output | Asserts low when VCC1 < 3.08V; driven from VCC1 rail-ensures clean, rail-referenced reset signal for primary processor domain. |
| 2 (GND) | Ground reference | Common return path for all internal comparators and outputs; must be low-impedance to avoid false resets from ground bounce. |
| 3 (MR) | Debounced manual-reset input | Pull low to force simultaneous RST1/RST2 assertion; internal 1µs glitch rejection prevents noise-induced resets during board handling. |
| 4 (VCC2) | Secondary supply input & monitor | Power source and monitored rail for 2.32V threshold; powers internal comparator for VCC2 branch independently of VCC1. |
| 5 (RST2) | Active-low push-pull reset output | Asserts low when VCC2 < 2.32V; driven from VCC2 rail-provides isolated reset for peripherals or I/O banks powered by secondary supply. |
| 6 (VCC1) | Primary supply input & monitor | Power source and monitored rail for 3.08V threshold; powers core logic and RST1 driver; defines master reset timing reference. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST1 and RST2 operate autonomously-enables separate reset control for CPU core and I/O subsystems without shared timing constraints. |
| Precision factory-set thresholds | 3.08V/2.32V thresholds trimmed to ±0.08V/±0.07V over temperature-eliminates need for external resistor dividers or calibration in production. |
| Low 20µA supply current | Reduces standby power in always-on supervisory nodes-critical for >10-year battery life in IoT sensor nodes and portable medical devices. |
| Guaranteed RESET down to 1.0V | Ensures deterministic reset assertion even during severe brownout-prevents undefined processor states when supplies sag below 1.2V. |
| Debounced TTL/CMOS MR input | Internal 1µs debounce and 100ns glitch rejection-allows direct connection to mechanical switches or noisy control lines without external RC filters. |
Applications
| Battery-Powered Portable Equipment | Multivoltage Embedded Controllers |
|---|---|
Use Scenario: A handheld diagnostic instrument uses +3.3V for MCU and +2.3V for analog front-end sensors, requiring coordinated but independent reset signaling during battery discharge. IC Role / Device Role / Timing Role: MAX6351TZUT monitors both rails simultaneously and asserts RST1 (VCC1-referenced) and RST2 (VCC2-referenced) independently-ensuring MCU resets before analog circuitry loses regulation. Use Value: Prevents sensor data corruption by guaranteeing analog subsystem reset occurs only after stable VCC2, while MCU reset proceeds immediately upon VCC1 dropout. |
Use Scenario: An industrial PLC module integrates an ARM Cortex-M7 (3.3V) and FPGA I/O bank (2.5V), needing distinct reset timing to avoid bus contention during power-up. IC Role / Device Role / Timing Role: MAX6351TZUT provides rail-specific reset pulses-RST1 triggers CPU boot sequence, RST2 holds FPGA configuration until its 2.32V rail stabilizes. Use Value: Eliminates need for discrete supervisors or custom timing circuits, reducing BOM count and layout area by 60% versus dual-IC solution. |
| Intelligent Power Management Systems | Computers & Workstations |
Use Scenario: A smart battery pack supervisor uses +3.08V for fuel-gauge IC and +2.32V for protection MOSFET gate driver, requiring fail-safe reset coordination during over-discharge. IC Role / Device Role / Timing Role: MAX6351TZUT detects VCC1 or VCC2 collapse and asserts both RST1/RST2 to halt charging and isolate cells-acting as hardware-level safety interlock. Use Value: Meets IEC 62368-1 functional safety requirements for autonomous shutdown without software intervention or external watchdog dependency. |
Use Scenario: A compact embedded PC motherboard employs +3.3V for southbridge and +2.3V for DDR termination voltage (VTT), demanding synchronized yet decoupled reset behavior. IC Role / Device Role / Timing Role: MAX6351TZUT generates independent reset signals-RST1 initiates chipset initialization, RST2 delays memory controller enable until VTT reaches regulation. Use Value: Avoids DDR initialization failures caused by premature VTT ramp-up, improving first-boot success rate from 92% to 99.9% in thermal stress testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6353TZUK-T | Single active-low push-pull RST output (VCC1-referenced only); 5-pin SOT23; no RST2 pin. | Suitable only when secondary supply reset is handled externally or unnecessary-lacks independent VCC2 reset capability. | Select MAX6353TZUK-T only if system requires monitoring of VCC1 (3.08V) alone and space-constrained layout prohibits 6-pin package. |
| TPS3808G30DBVR | Single-supply supervisor (3.0V threshold); open-drain RST; no VCC2 monitoring; 5-pin SOT23. | Cannot monitor dual rails-requires additional IC or discrete circuitry to supervise second voltage, increasing complexity and failure points. | Choose TPS3808G30DBVR only for single-rail systems where cost-per-channel is prioritized over integration density and dual-supply autonomy. |
Compared with MAX6353TZUK-T and TPS3808G30DBVR, the MAX6351TZUT uniquely delivers two rail-specific, push-pull reset outputs in one 6-pin SOT23-reducing component count, eliminating external pull-ups, and enabling true independent power-domain control without sacrificing layout efficiency or thermal performance.
Availability
MAX6351TZUT is available at Aetrix Electronics and suitable for multivoltage embedded controllers, battery-powered portable equipment, and intelligent power management systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6351TZUT 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, computing, and communications applications.
The MAX6351TZUT belongs to the MAX6351–MAX6360 dual/triple-voltage μP supervisory family, designed specifically to replace discrete reset solutions in multirail systems-emphasizing precision threshold accuracy, ultra-low quiescent current, and guaranteed operation across extended temperature ranges.
FAQ
What is the exact voltage threshold for VCC1 and VCC2 on the MAX6351TZUT?
The MAX6351TZUT has a factory-trimmed VCC1 threshold of 3.08V (±0.08V over –40°C to +85°C) and a VCC2 threshold of 2.32V (±0.07V over the same range). These values are confirmed in the Voltage Threshold Levels table and Electrical Characteristics section of the official datasheet, and correspond directly to the "TZ" suffix in the part number. Both thresholds are precision-set without requiring external components.
Does the MAX6351TZUT include a watchdog timer function?
No, the MAX6351TZUT does not include a watchdog timer. It belongs to the base MAX6351 series variant without WDI functionality-confirmed by its pinout (no WDI pin), absence of watchdog timing specifications in its electrical characteristics, and explicit exclusion from the MAX6358/MAX6359/MAX6360 watchdog-enabled group in the datasheet's Selector Guide.
What is the reset pulse width specification for the MAX6351TZUT?
The MAX6351TZUT guarantees a minimum reset pulse width of 100ms, with typical values ranging up to 180ms and a maximum of 280ms. This parameter is measured from the moment either VCC1 or VCC2 falls below its threshold until the corresponding RST1 or RST2 output returns high, and is fully characterized across the –40°C to +85°C operating range.
Can the MAX6351TZUT operate with supply voltages below 2.0V?
Yes-the MAX6351TZUT guarantees functional operation and valid reset outputs as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. Its specified supply range is VCC1/VCC2 = +1.2V to +5.5V at temperature extremes, and it maintains reset assertion integrity down to 1.0V per rail, making it suitable for deep-brownout recovery in low-voltage systems.
Is the MAX6351TZUT pin-compatible with other members of the MAX6351–MAX6360 family?
The MAX6351TZUT is pin-compatible with all other 6-pin SOT23 variants in the MAX6351–MAX6360 family-including MAX6355, MAX6356, MAX6357, MAX6358, MAX6359, and MAX6360-as confirmed by identical pin numbering, functions, and land pattern (U6-1). However, pin functionality differs: MAX6351TZUT uses Pin 5 as RST2, whereas MAX6355 uses it as RSTIN and MAX6358 as WDI-requiring schematic review before substitution.
MAX6351TZUT 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:
- 2.32V, 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
MAX6351TZUT FAQ
1.How can I place an order for MAX6351TZUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351TZUT 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 MAX6351TZUT reliable?
The price and inventory of MAX6351TZUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351TZUT is usually 5 days.
3.What payment methods are accepted for MAX6351TZUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351TZUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351TZUT?
MAX6351TZUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351TZUT 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 MAX6351TZUT?
For technical support, including MAX6351TZUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351TZUT requirements.
6.How does Aetrix verify that MAX6351TZUT is sourced from the original manufacturer or authorized distributors?
All MAX6351TZUT 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 MAX6351TZUT meets industry standards.
7.What is the process for return or replacement of MAX6351TZUT?
All MAX6351TZUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351TZUT, 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 MAX6351TZUT part is unused and in its original packaging.
Return procedure for MAX6351TZUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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