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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 MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,480
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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 (RST1 referenced to VCC1, RST2 to VCC2), factory-set precision thresholds of 3.08V (VCC1) and 2.32V (VCC2), 20µA supply current, and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used in multivoltage embedded systems requiring coordinated power-on reset and supply fault detection.
For engineers reviewing the MAX6351TZUT+ datasheet, MAX6351TZUT+ pinout, MAX6351TZUT+ application, or MAX6351TZUT+ equivalent, key selection concerns include dual-supply threshold matching, push-pull output drive capability per rail, manual-reset debouncing, temperature-stable reset timeout (100–280ms), and compatibility with 1.2–5.5V supply ranges across -40°C to +85°C.
Technical Context
The MAX6351TZUT+ implements independent voltage comparators for VCC1 and VCC2, asserting both RST1 and RST2 simultaneously if either supply drops below its respective threshold. Its internal glitch-filtered manual-reset input (MR) forces reset when pulled low, with recovery delay under 0.1µs and 100ns noise immunity.
No watchdog timer or third-voltage monitor is present - this variant belongs to the base MAX6351 family (not MAX6358/59/60 or MAX6355/56/57), confirming absence of WDI and RSTIN pins. Reset assertion is guaranteed as long as at least one supply remains ≥1.0V, enabling robust brownout handling in asymmetric dual-rail systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 3.08V ±0.08V (min/max over -40°C to +85°C); precise trip point for +3.3V rail monitoring |
| VCC2 Threshold | 2.32V ±0.07V (min/max over -40°C to +85°C); precise trip point for +2.5V or +2.3V auxiliary rail |
| Supply Current | 20µA typical (VCC1=5.5V, VCC2=3.6V); enables battery-backed or ultra-low-power system supervision |
| Reset Timeout | 100–280ms; ensures reliable processor initialization before release, with guaranteed minimum pulse width |
| Output Type | Two active-low push-pull outputs (RST1 @ VCC1, RST2 @ VCC2); eliminates external pull-ups and supports direct µP reset pin drive |
| Operating Temp | -40°C to +85°C extended range; qualified for industrial and automotive-adjacent embedded applications |
| Reset Validity | Guaranteed while VCC1 ≥ 1.0V OR VCC2 ≥ 1.0V; maintains deterministic reset state during deep brownout |
Pinout & Package
MAX6351TZUT+ is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), RoHS-compliant with lead(Pb)-free termination ("+" suffix). Pin 1 is RST1, Pin 2 is GND, Pin 3 is MR, Pin 4 is VCC2, Pin 5 is RST2, Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RST1) | Active-low push-pull reset output referenced to VCC1 | Drives reset signal directly to µP or logic on VCC1 domain; no external pull-up required |
| 2 (GND) | Analog/digital ground reference | Common return path for all internal comparators and outputs; must be low-impedance |
| 3 (MR) | Debounced manual-reset input | Pull low to force immediate reset; internally filtered against <100ns glitches |
| 4 (VCC2) | Secondary supply input and monitor rail | Power source and monitored voltage for RST2; valid from 1.2V to 5.5V |
| 5 (RST2) | Active-low push-pull reset output referenced to VCC2 | Drives reset signal directly to peripherals or logic on VCC2 domain |
| 6 (VCC1) | Primary supply input and monitor rail | Power source and monitored voltage for RST1; valid from 1.2V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of two non-identical rails (e.g., 3.3V core + 2.5V I/O) with separate thresholds and outputs |
| Push-pull reset outputs | Eliminates need for external pull-up resistors on both RST1 and RST2, reducing BOM count and board space |
| 1.0V reset validity floor | Ensures deterministic reset behavior even during severe brownout where one rail collapses below 1.2V |
| 20µA ultra-low quiescent current | Minimizes standby power draw in always-on or battery-critical systems without sacrificing accuracy |
| Factory-trimmed thresholds | 3.08V/2.32V thresholds laser-trimmed at wafer test; no calibration or external components needed |
Applications
| Industrial PLC Controller | Medical Diagnostic Handheld |
|---|---|
Use Scenario: Dual-rail microcontroller system (3.3V CPU, 2.5V sensor interface) requires synchronized reset on power-up and independent fault detection per rail. IC Role / Device Role / Timing Role: MAX6351TZUT+ monitors both supplies and asserts RST1/RST2 concurrently to hold µP and peripherals in reset until both rails stabilize above 3.08V and 2.32V respectively. Use Value: Prevents partial initialization and bus contention by ensuring all subsystems release reset only after both voltage domains meet specification. | Use Scenario: Portable diagnostic device with lithium battery backup uses 3.3V main rail and 2.3V analog front-end; must maintain safe shutdown during battery sag. IC Role / Device Role / Timing Role: MAX6351TZUT+ detects VCC2 droop below 2.32V before critical analog circuitry fails, triggering RST2 to disable sensitive measurement paths. Use Value: Enables graceful degradation - digital logic remains functional via VCC1 while analog section resets cleanly, avoiding corrupted readings. |
| Automotive Body Control Module | Network Edge Router |
Use Scenario: BCM with separate 5V MCU supply and 3.3V CAN transceiver rail must survive cold-crank (battery dip to 6V) and hot-soak conditions. IC Role / Device Role / Timing Role: MAX6351TZUT+'s 1.0V reset validity ensures RST1 stays asserted during deep VCC1 sags, while VCC2 (3.3V rail) sustains RST2 for CAN subsystem integrity. Use Value: Guarantees CAN communication remains disabled until both rails recover, preventing bus arbitration errors during re-power-up. | Use Scenario: High-density router with multiple voltage domains (3.3V PHY, 2.5V switch fabric) requires fail-safe boot sequencing and runtime fault isolation. IC Role / Device Role / Timing Role: MAX6351TZUT+ independently monitors 3.08V (PHY) and 2.32V (fabric) rails; asserts dedicated RST1/RST2 to isolate faults without resetting entire system. Use Value: Enables modular recovery - only affected subsystem resets while control plane remains operational, improving uptime. |
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#T | Same electrical specs and pinout; leaded (Pb-containing) packaging instead of lead-free | Required where RoHS exemption applies or legacy assembly process mandates Pb-based solder | Select only if Pb-free compliance is not mandated by end-market regulations or customer requirements |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no dual-rail monitoring or second reset output | Suitable only for single-rail systems; cannot replace MAX6351TZUT+ in dual-voltage coordination scenarios | Use only when supervising one rail; requires additional IC or redesign for dual-rail functionality |
Compared with MAX6351TZUT+, the MAX6351TZUT#T offers identical performance in a leaded package for legacy manufacturing, while TPS3808G33DBVR provides lower-cost single-rail supervision but lacks the coordinated dual-output architecture essential for multivoltage system integrity.
Availability
MAX6351TZUT+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical diagnostics, automotive body control modules, and network edge routers requiring stable component supply across extended temperature operation and dual-rail reliability.
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) designs high-performance analog and mixed-signal ICs for industrial, communications, and computing applications, with emphasis on power management, sensing, and interface solutions.
The MAX6351TZUT+ belongs to the MAX6351–MAX6360 dual/triple-voltage µP supervisory family, engineered specifically for multivoltage embedded systems needing coordinated, rail-specific reset generation without external components.
FAQ
What is the exact reset threshold voltage for each supply on the MAX6351TZUT+?
The MAX6351TZUT+ has a factory-set 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 laser-trimmed and specified in the Voltage Threshold Levels table of the datasheet; the "TZ" suffix directly encodes these two thresholds. Both thresholds exhibit ≤20ppm/°C tempco for high-accuracy supervision across temperature.
Does the MAX6351TZUT+ include a watchdog timer function?
No, the MAX6351TZUT+ does not include a watchdog timer. It belongs to the base MAX6351 series, which lacks the WDI pin and associated timing circuitry. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants (indicated by "U" or "W" suffixes in the ordering table). The MAX6351TZUT+ provides only dual-voltage monitoring and manual reset, with no timeout-based processor activity checking.
What is the pin configuration and package type of the MAX6351TZUT+?
The MAX6351TZUT+ uses a 6-pin SOT23 package (outline U6-1, land pattern 90-0175) with RoHS-compliant lead-free termination. Pin 1 = RST1 (active-low push-pull, VCC1-referenced), Pin 2 = GND, Pin 3 = MR (debounced manual reset), Pin 4 = VCC2, Pin 5 = RST2 (active-low push-pull, VCC2-referenced), Pin 6 = VCC1. This matches the top-view diagram on page 9 of the datasheet.
Can the MAX6351TZUT+ operate with supply voltages below 1.2V?
The MAX6351TZUT+ guarantees full functionality only for VCC1 and VCC2 between 1.2V and 5.5V. However, its reset outputs remain valid (i.e., correctly asserted or deasserted) as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - a critical feature for brownout resilience. Below 1.0V on both rails, reset state is undefined; operation below 1.2V is not characterized or guaranteed per the Absolute Maximum Ratings table.
How does the manual reset (MR) input behave on the MAX6351TZUT+?
The MR input on the MAX6351TZUT+ is a debounced, active-low TTL/CMOS-compatible signal. Pulling MR low forces immediate assertion of both RST1 and RST2; reset remains active for the full timeout period (100–280ms) after MR returns high. MR has 100ns glitch rejection, and its voltage thresholds are defined relative to VCC1 (VIH ≥ 2.3V, VIL ≤ 0.8V for standard versions). Leaving MR unconnected or tying it to VCC1 disables manual reset.
MAX6351TZUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- 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-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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