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Analog Devices Inc./Maxim Integrated MAX6351LRUT+
- Part No.:
- MAX6351LRUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351LRUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
The MAX6351LRUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-one referenced to VCC1 (4.63V threshold) and one to VCC2 (2.63V threshold)-designed for multivoltage systems requiring precise, independent monitoring of +5V and +2.5V rails. It guarantees RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, features 20µA supply current, and operates across –40°C to +85°C in a 6-pin SOT23 package.
For engineers reviewing the MAX6351LRUT+ datasheet, MAX6351LRUT+ pinout, MAX6351LRUT+ application, or MAX6351LRUT+ equivalent, key selection criteria include dual-rail reset assertion timing, guaranteed operation below 1.2V supply, push-pull output drive capability per rail, and compatibility with manual-reset and transient-immune system designs.
Technical Context
The MAX6351LRUT+ implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.63V ±0.09V and 2.63V ±0.08V at +25°C), 20ppm/°C tempco, and 500mV hysteresis. Reset assertion occurs immediately when either supply falls below its respective threshold, with a guaranteed 100ms minimum reset pulse width after recovery.
Its dual push-pull outputs (RST1 referenced to VCC1, RST2 to VCC2) drive CMOS loads directly without external pull-ups, and the debounced manual-reset input (MR) forces reset for ≥1µs pulses while maintaining output state during MR low and for the timeout period after release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±0.09V at +25°C; ensures reliable reset assertion on +5V rail dropout |
| VCC2 Threshold | 2.63V ±0.08V at +25°C; enables accurate supervision of +2.5V logic or I/O supply |
| Supply Current | 20µA typical; supports ultra-low-power battery-backed or portable applications |
| Reset Pulse Width | 100–280ms; guarantees sufficient duration for μP initialization across temperature |
| Operating Temp | –40°C to +85°C; fully specified for industrial embedded and automotive-adjacent environments |
| RESET Validity | Valid down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; maintains system integrity during deep brownout |
| Reset Delay | 20µs max after VCC overdrive; enables fast response to supply transients |
Pinout & Package
MAX6351LRUT+ is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives μP reset directly without pull-up |
| 2 | GND | Ground reference for all internal comparators and outputs; must be low-impedance return path |
| 3 | MR | Debounced manual-reset input; asserted low ≥1µs forces RST1/RST2 active; no external RC needed |
| 4 | VCC2 | Secondary supply input and monitored rail; powers device when > VCC1 and sets RST2 reference |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; independently controls secondary domain reset |
| 6 | VCC1 | Primary supply input and monitored rail; powers device when > VCC2 and sets RST1 reference |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Separate push-pull RST1 (VCC1-referenced) and RST2 (VCC2-referenced) eliminate need for level-shifting or external drivers |
| Precision dual-threshold monitoring | Factory-trimmed 4.63V/2.63V thresholds with <±0.09V tolerance ensure accurate +5V/+2.5V rail supervision |
| Low-power operation | 20µA supply current enables use in always-on supervisory paths without impacting system standby budget |
| Brownout resilience | Guaranteed RESET validity down to VCC1 = 1.0V or VCC2 = 1.0V prevents spurious release during deep undervoltage |
| Transient immunity | Immunity to short negative-going VCC transients (<100ns at 0.5V overdrive) avoids false resets in noisy power environments |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Supervising dual-rail power domains (5V analog front-end and 2.5V digital core) in programmable logic controllers subject to wide ambient temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-voltage supervisor asserting independent reset signals to separate processor and ADC subsystems upon rail failure. Use Value: Prevents partial initialization by ensuring both domains reset synchronously only when both supplies meet threshold stability criteria. | Use Scenario: Power sequencing and fault detection in portable ultrasound or glucose meters where battery voltage decay must trigger controlled shutdown before data corruption. IC Role / Device Role / Timing Role: Monitoring main Li-ion (4.2V→3.0V) and regulated 2.5V logic rail to assert reset before critical brownout-induced memory loss. Use Value: 20µA quiescent current extends battery life; 100ms min reset pulse ensures full firmware reload before power collapse. |
| Automotive Infotainment Gateways | Network Edge Routers |
Use Scenario: Ensuring robust boot sequence in head-unit ECUs with separate 5V MCU supply and 2.5V CAN transceiver supply under cold-crank conditions. IC Role / Device Role / Timing Role: Dual-supply monitor providing rail-specific reset assertion to prevent CAN bus lockup during 5V rail dip while 2.5V remains stable. Use Value: Push-pull outputs drive CAN transceiver EN pins directly; VCC ≥ 1.0V validity sustains reset during cranking transients. | Use Scenario: Supervising redundant 5V PoE injectors and 2.5V FPGA configuration rails in enterprise switches operating 24/7 in temperature-controlled datacom environments. IC Role / Device Role / Timing Role: Independent reset generation for CPU and FPGA domains, enabling selective reinitialization without full system reboot. Use Value: 20ppm/°C tempco ensures threshold stability across 0–70°C operating range; no external components reduce BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6353LRUK+ | Single active-low push-pull reset output referenced to VCC1 only; no RST2 output; 5-pin SOT23 | Lacks independent VCC2-domain reset control; suitable only when secondary rail does not require dedicated reset assertion | Select when system uses only one critical reset domain and board space is constrained. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); open-drain output; no dual-rail monitoring or push-pull drive | Requires external pull-up and cannot supervise two independent rails simultaneously | Choose only for single-rail applications where cost and footprint are primary constraints. |
Compared with MAX6353LRUK+, the MAX6351LRUT+ provides full dual-rail reset independence and push-pull drive per domain; versus TPS3808G33DBVR, it delivers true multivoltage supervision without external components or level-shifting, making it essential for systems where coordinated domain reset timing is critical.
Availability
MAX6351LRUT+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive infotainment gateways, network edge routers, and multivoltage embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6351LRUT+ 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, communications, and computing applications.
The MAX6351–MAX6360 product line was designed specifically for multivoltage microprocessor systems requiring precision, low-power, and thermally stable supervision of two or three independent supply rails.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351LRUT+?
The MAX6351LRUT+ has a factory-trimmed VCC1 threshold of 4.63V ±0.09V at +25°C and a VCC2 threshold of 2.63V ±0.08V at +25°C, with guaranteed operation across –40°C to +85°C. These values correspond to the "LR" suffix in the Voltage Threshold Levels table and are confirmed in the Electrical Characteristics section of the MAX6351–MAX6360 datasheet. The MAX6351LRUT+ uses these precise thresholds to supervise +5V and +2.5V rails independently.
Does the MAX6351LRUT+ support operation when one supply drops below 1.2V?
Yes, the MAX6351LRUT+ guarantees valid reset output states as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, per the Absolute Maximum Ratings and Electrical Characteristics tables. This brownout resilience allows the MAX6351LRUT+ to maintain correct reset assertion during deep undervoltage events-critical for fail-safe behavior in battery-powered or automotive cold-crank scenarios.
Can the MAX6351LRUT+ replace a discrete resistor-divider + comparator solution for dual-rail monitoring?
Yes, the MAX6351LRUT+ eliminates the need for external resistors, comparators, and timing components required in discrete dual-rail supervisors. Its integrated precision comparators, push-pull outputs, debounced MR input, and guaranteed 100ms reset pulse provide a complete, calibrated solution-reducing BOM count, PCB area, and design validation effort compared to discrete alternatives.
What is the function of Pin 5 (RST2) on the MAX6351LRUT+?
Pin 5 on the MAX6351LRUT+ is RST2-an active-low, push-pull reset output referenced to VCC2. It asserts when VCC2 falls below its 2.63V threshold and remains asserted until VCC2 recovers and holds above threshold for the reset timeout period. Unlike open-drain variants, RST2 drives low actively and high via internal transistor, enabling direct connection to CMOS inputs without external pull-up resistors.
Is the MAX6351LRUT+ RoHS-compliant and lead-free?
Yes, the MAX6351LRUT+ is RoHS-compliant and supplied in lead(Pb)-free packaging, as indicated by the "+" suffix in the part number per Maxim's ordering conventions. The device meets JEDEC J-STD-020 moisture sensitivity level 1 and is qualified for reflow soldering per industry-standard profiles. Full compliance documentation for the MAX6351LRUT+ is available through Analog Devices' product change notifications and material declarations.
MAX6351LRUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, 4.63V
- 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
MAX6351LRUT+ FAQ
1.How can I place an order for MAX6351LRUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351LRUT+ 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 MAX6351LRUT+ reliable?
The price and inventory of MAX6351LRUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351LRUT+ is usually 5 days.
3.What payment methods are accepted for MAX6351LRUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351LRUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351LRUT+?
MAX6351LRUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351LRUT+ 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 MAX6351LRUT+?
For technical support, including MAX6351LRUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351LRUT+ requirements.
6.How does Aetrix verify that MAX6351LRUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6351LRUT+ 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 MAX6351LRUT+ meets industry standards.
7.What is the process for return or replacement of MAX6351LRUT+?
All MAX6351LRUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351LRUT+, 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 MAX6351LRUT+ part is unused and in its original packaging.
Return procedure for MAX6351LRUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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