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Analog Devices Inc./Maxim Integrated MAX6351SYUT-T
- Part No.:
- MAX6351SYUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351SYUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
The MAX6351SYUT-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs (RST1 referenced to VCC1, RST2 referenced to VCC2), factory-set precision thresholds of 2.93V (VTH1) and 2.19V (VTH2), 20µA supply current, and guaranteed RESET validity down to VCC1 ≥ 1V or VCC2 ≥ 1V - used in multivoltage embedded systems requiring reliable power-on and brownout detection.
For engineers reviewing the MAX6351SYUT-T datasheet, MAX6351SYUT-T pinout, MAX6351SYUT-T application, or MAX6351SYUT-T 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 PCB layouts.
Technical Context
The MAX6351SYUT-T implements independent voltage comparators for VCC1 and VCC2, asserting both RST1 and RST2 when either supply falls below its respective threshold (2.93V/2.19V). Reset assertion is maintained as long as at least one supply remains ≥1.0V, enabling robust operation during asymmetric supply sequencing.
It features a debounced TTL/CMOS-compatible manual-reset input (MR), no watchdog timer or third-voltage monitor (distinguishing it from MAX6358/MAX6355 variants), and operates across –40°C to +85°C with ±20ppm/°C reset threshold tempco and 100ms minimum power-on-reset pulse width.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V ±0.05V (TA = –40°C to +85°C); precise brownout detection for +3.0V nominal rails |
| VCC2 Threshold | 2.19V ±0.06V (TA = –40°C to +85°C); enables monitoring of +2.5V or +2.2V auxiliary supplies |
| Supply Current | 20µA typical (VCC1=5.5V, VCC2=3.6V); ultra-low quiescent draw for battery-backed systems |
| Reset Timeout | 100–280ms; ensures sufficient processor initialization time after power stabilization |
| 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; qualified for industrial and extended-temperature embedded applications |
| Reset Validity | Guaranteed while VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; maintains reset integrity during deep brownout conditions |
Pinout & Package
MAX6351SYUT-T is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), with 1.0mm pitch, 2.9mm × 1.6mm footprint, and thermal pad not present. Pin 1 is RST1 (active-low push-pull, referenced to VCC1); Pin 5 is RST2 (active-low push-pull, referenced to VCC2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output tied to VCC1 rail; drives µP reset directly without pull-up resistor |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic |
| 3 | MR | Debounced manual-reset input; low pulse forces simultaneous RST1/RST2 assertion for system recovery |
| 4 | VCC2 | Second supply input and monitored voltage source; powers internal circuitry when VCC2 > VCC1 |
| 5 | RST2 | Active-low push-pull reset output tied to VCC2 rail; independent timing and drive strength from RST1 |
| 6 | VCC1 | Primary supply input and monitored voltage source; powers internal circuitry when VCC1 > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous precision supervision of two distinct supply rails (e.g., core + I/O) with no shared threshold dependency |
| Push-pull reset outputs | Eliminates need for external pull-up resistors on both RST1 and RST2, reducing BOM count and board area |
| 1V minimum supply validity | Ensures deterministic reset behavior even during severe brownout where one rail collapses to 1.0V |
| 20µA ultra-low ICC | Enables use in always-on subsystems and energy-sensitive portable equipment without compromising supervision reliability |
| –40°C to +85°C guaranteed operation | Full electrical performance validated across industrial temperature range without derating |
Applications
| Computers | Controllers |
|---|---|
Use Scenario: Desktop motherboard with separate +3.3V I/O and +2.5V memory supply rails. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting coordinated reset signals to CPU and memory controller upon independent rail failure. Use Value: Prevents partial initialization and data corruption by ensuring both domains reset simultaneously when either rail violates threshold. | Use Scenario: PLC main controller board with +3.0V FPGA core and +2.2V transceiver supply. IC Role / Device Role / Timing Role: Independent monitoring of FPGA VCCINT and communication PHY supply, driving dedicated reset lines. Use Value: Enables fault-isolation - if only transceiver supply fails, FPGA remains operational and can log error before controlled shutdown. |
| Portable/Battery-Powered Equipment | Multivoltage Systems |
Use Scenario: Medical handheld device with +3.0V MCU and +2.2V sensor analog front-end. IC Role / Device Role / Timing Role: Supervises both rails using single IC; RST1 triggers MCU reset, RST2 holds AFE in reset until stable. Use Value: 20µA supply current extends battery life; 1V validity allows clean reset even during battery sag below 2.0V. | Use Scenario: Industrial gateway with +3.3V application processor, +2.5V DDR interface, and +1.8V PHY. IC Role / Device Role / Timing Role: Monitors primary +3.3V and secondary +2.5V rails; third rail monitored via external divider (not applicable to MAX6351). Use Value: Provides dual-rail coverage with minimal footprint; eliminates need for discrete supervisors or resistor networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6353SYUK-T | 5-pin SOT23; single active-low push-pull RST output referenced to VCC1 only; no RST2 | Suitable only for single-rail reset coordination; cannot supervise VCC2 independently | Select when only one monitored rail requires reset assertion and board space is constrained |
| TLV809E29DBZR | Single-supply supervisor (2.93V threshold); open-drain output; no dual-rail or push-pull capability | Requires external pull-up; cannot monitor or assert reset on second rail | Choose for cost-sensitive, single-rail applications where dual monitoring is unnecessary |
Compared with MAX6353SYUK-T and TLV809E29DBZR, the MAX6351SYUT-T uniquely delivers two independent push-pull reset outputs with rail-specific referencing - essential for systems where both VCC1 and VCC2 must trigger distinct, actively driven reset actions without external components.
Availability
MAX6351SYUT-T is available at Aetrix Electronics and suitable for computers, controllers, portable/battery-powered equipment, and multivoltage systems requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6351SYUT-T 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, computing, and communications markets.
The MAX6351–MAX6360 family was engineered specifically for reliable dual- and triple-supply monitoring in space-constrained embedded systems, emphasizing precision threshold accuracy, ultra-low power, and robust reset timing over extended temperature ranges.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351SYUT-T?
The MAX6351SYUT-T has a factory-set VCC1 threshold of 2.93V (±0.05V over –40°C to +85°C) and a VCC2 threshold of 2.19V (±0.06V over the same range), as defined by the "SY" suffix in the Voltage Threshold Levels table. These values are precision-trimmed during production and guaranteed across temperature without external calibration.
Does the MAX6351SYUT-T include a watchdog timer function?
No, the MAX6351SYUT-T does not include a watchdog timer. Watchdog functionality is exclusive to the MAX6358/MAX6359/MAX6360 variants. The MAX6351SYUT-T provides only dual-voltage monitoring, manual reset, and two independent push-pull reset outputs - confirmed by its pinout (no WDI pin) and absence of watchdog specifications in its electrical characteristics.
Can the MAX6351SYUT-T monitor a third voltage rail?
No, the MAX6351SYUT-T cannot monitor a third voltage. Third-rail monitoring is supported only by MAX6355/MAX6356/MAX6357 variants, which feature the RSTIN input pin. The MAX6351SYUT-T has only VCC1, VCC2, MR, GND, RST1, and RST2 pins - no RSTIN or auxiliary comparator input.
What is the minimum valid supply voltage for the MAX6351SYUT-T to guarantee correct reset output states?
The MAX6351SYUT-T guarantees correct RST1 and RST2 output states as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - explicitly stated in the datasheet's Absolute Maximum Ratings and Electrical Characteristics sections. This ensures functional reset assertion even during deep brownout conditions where one rail collapses near 1V.
Is the MAX6351SYUT-T pin-compatible with other devices in the MAX6351–MAX6360 family?
The MAX6351SYUT-T shares the same 6-pin SOT23 (U6-1) package and pinout with MAX6355/MAX6356/MAX6357/MAX6358/MAX6359/MAX6360, but functional pin assignments differ: Pin 5 is RST2 on MAX6351SYUT-T, whereas it is RSTIN on MAX6355–MAX6357 and WDI on MAX6358–MAX6360. Therefore, it is not functionally pin-compatible across the full family without schematic revision.
MAX6351SYUT-T 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:
- 2.19V, 2.93V
- 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
MAX6351SYUT-T FAQ
1.How can I place an order for MAX6351SYUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351SYUT-T 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 MAX6351SYUT-T reliable?
The price and inventory of MAX6351SYUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351SYUT-T is usually 5 days.
3.What payment methods are accepted for MAX6351SYUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351SYUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351SYUT-T?
MAX6351SYUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351SYUT-T 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 MAX6351SYUT-T?
For technical support, including MAX6351SYUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351SYUT-T requirements.
6.How does Aetrix verify that MAX6351SYUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6351SYUT-T 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 MAX6351SYUT-T meets industry standards.
7.What is the process for return or replacement of MAX6351SYUT-T?
All MAX6351SYUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351SYUT-T, 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 MAX6351SYUT-T part is unused and in its original packaging.
Return procedure for MAX6351SYUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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