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Analog Devices Inc./Maxim Integrated MAX6351UVUT
- Part No.:
- MAX6351UVUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351UVUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,490
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Product details
Overview
MAX6351UVUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-one referenced to VCC1 (2.78V threshold) and one to VCC2 (1.58V threshold)-designed for multivoltage systems requiring precise, independent supply monitoring. It operates from -40°C to +85°C, draws only 20µA, and guarantees valid RESET output down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. It is used in portable battery-powered equipment where reliable power sequencing and brownout detection across asymmetric rails are critical.
For engineers reviewing the MAX6351UVUT datasheet, MAX6351UVUT pinout, MAX6351UVUT application, or MAX6351UVUT equivalent, key selection considerations include its dual-threshold precision (±0.05V over temperature), guaranteed 100ms minimum reset pulse width, debounced manual-reset input, and compatibility with mixed-voltage logic domains via separate VCC-referenced outputs.
Technical Context
The MAX6351UVUT implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (2.78V and 1.58V respectively) and 20ppm/°C tempco. Reset assertion occurs if either supply falls below its trip point, and both RST1 and RST2 remain asserted as long as at least one supply stays above 1.0V.
It features fully integrated glitch-filtered manual reset (MR) with <1µs pulse rejection, no external components required for dual-rail supervision, and push-pull outputs capable of sinking 1.2mA at VCC ≥ 2.7V. The device uses BiCMOS process for low quiescent current and high noise immunity against supply transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.78V ±0.05V at +25°C; ensures reliable reset assertion when primary rail drops below nominal 2.8V |
| VCC2 Threshold | 1.58V ±0.05V at +25°C; enables accurate monitoring of auxiliary or I/O rail at 1.6V level |
| Supply Current | 20µA typical; supports ultra-low-power operation in battery-backed or energy-constrained systems |
| Reset Pulse Width | 100ms minimum; meets μP reset timing requirements without external RC timing |
| Operating Temp | -40°C to +85°C; qualified for industrial and extended-temperature embedded applications |
| Reset Output Type | Two active-low push-pull outputs-RST1 referenced to VCC1, RST2 to VCC2-eliminates need for external pull-ups |
| MR Input | Debounced TTL/CMOS-compatible; accepts clean or noisy manual reset signals without external filtering |
Pinout & Package
MAX6351UVUT is housed in a 6-pin SOT23 package (U6-1 outline), surface-mount compatible with standard reflow profiles and footprint 90-0175. The package supports lead-free (RoHS-compliant) assembly and is rated for 695mW continuous power dissipation at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives low to reset circuits powered by VCC1 rail |
| 2 | GND | Analog/digital ground reference for all internal comparators and logic |
| 3 | MR | Debounced manual-reset input; pulling low forces simultaneous assertion of RST1 and RST2 |
| 4 | VCC2 | Secondary supply input and monitor rail; powers internal circuitry when VCC2 > VCC1 |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; resets peripherals on VCC2 domain |
| 6 | VCC1 | Primary supply input and monitor rail; powers internal circuitry when VCC1 > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage thresholds | Factory-trimmed 2.78V (VCC1) and 1.58V (VCC2) with ±0.05V tolerance ensures accurate rail-specific reset without calibration |
| Push-pull reset outputs | RST1 and RST2 drive actively low with no external pull-up required-reduces BOM count and PCB area in dual-domain systems |
| Guaranteed RESET validity to 1.0V | Outputs remain functional even as either VCC1 or VCC2 decays to 1.0V, enabling robust power-fail detection during brownout |
| 20µA supply current | Enables always-on supervision in battery-operated devices with multi-year runtime expectations |
| Power-supply transient immunity | Rejects short negative-going VCC transients up to 250ns (at 0.5V overdrive), preventing false resets in noisy environments |
Applications
| Battery-Powered Portable Systems | Multivoltage Industrial Controllers |
|---|---|
Use Scenario: A handheld medical instrument uses 2.8V for its main processor and 1.6V for its sensor interface ICs. IC Role / Device Role / Timing Role: MAX6351UVUT monitors both rails independently and asserts RST1 and RST2 simultaneously upon any undervoltage condition, ensuring coordinated system reset. Use Value: Prevents partial initialization or corrupted state when only one rail fails, improving field reliability and eliminating boot-time lockups. |
Use Scenario: An industrial PLC employs separate 3.3V logic and 1.8V FPGA I/O supplies subject to load-induced sags. IC Role / Device Role / Timing Role: MAX6351UVUT provides rail-specific reset signaling with VCC1 = 2.78V and VCC2 = 1.58V thresholds matched to actual supply tolerances. Use Value: Enables deterministic recovery after localized rail collapse without requiring custom resistor-divider networks or discrete supervisors. |
| Intelligent Instrumentation | Computing Peripherals with Asymmetric Rails |
Use Scenario: A benchtop oscilloscope uses 2.8V analog front-end and 1.6V ADC reference supplies. IC Role / Device Role / Timing Role: MAX6351UVUT's dual push-pull outputs drive dedicated reset lines for analog and digital subsystems, referenced to their respective supplies. Use Value: Eliminates level-shifter requirements between reset domains and avoids timing skew caused by shared open-drain buses. |
Use Scenario: A USB-C dock implements 2.8V USB PD controller and 1.6V display interface logic. IC Role / Device Role / Timing Role: MAX6351UVUT supervises both rails and asserts resets only when each supply remains within its defined safe operating window. Use Value: Ensures peripheral firmware never executes with invalid supply conditions-critical for USB enumeration stability and HDCP compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6351UVUT-T | Same electrical specs and pinout; differs only in tape-and-reel packaging (2500-piece minimum) | No functional difference; identical use in production PCBs | Select for volume manufacturing with automated placement |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no dual-rail capability or second reset output | Requires additional supervisor IC or redesign to support 1.6V rail monitoring | Only suitable if system reduces to single-rail supervision or adds discrete monitoring |
Compared with MAX6351UVUT, the MAX6351UVUT-T offers identical functionality in optimized packaging for SMT line efficiency, while the TPS3808G33DBVR lacks dual-threshold architecture and cannot replace MAX6351UVUT without board-level changes to accommodate separate 1.6V supervision.
Availability
MAX6351UVUT is available at Aetrix Electronics and suitable for portable/battery-powered equipment, multivoltage industrial controllers, intelligent instrumentation, computing peripherals, and embedded systems requiring stable component supply across extended temperature ranges.
Supply support for MAX6351UVUT 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 precision analog and mixed-signal ICs for industrial, automotive, and communications applications, with emphasis on high-reliability power management and interface solutions.
The MAX6351–MAX6360 family was developed specifically for multivoltage microprocessor systems needing independent, low-power, factory-trimmed supply supervision without external components.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351UVUT?
The MAX6351UVUT has a factory-set VCC1 threshold of 2.78V (±0.05V over temperature) and a VCC2 threshold of 1.58V (±0.05V over temperature), as confirmed in the Voltage Threshold Levels table and Electrical Characteristics section of the official datasheet. These values are laser-trimmed during production and do not require external adjustment. Both thresholds maintain 20ppm/°C tempco across -40°C to +85°C.
Does the MAX6351UVUT support watchdog timer functionality?
No, the MAX6351UVUT does not include a watchdog timer. Watchdog capability is exclusive to the MAX6358/MAX6359/MAX6360 variants in the same family. The MAX6351UVUT provides only dual-voltage monitoring with manual reset and two independent push-pull reset outputs-RST1 referenced to VCC1 and RST2 referenced to VCC2.
Can the MAX6351UVUT operate with VCC1 and VCC2 voltages below 2.0V?
Yes, the MAX6351UVUT is fully specified to operate with VCC1 and VCC2 as low as 1.2V over the full temperature range (-40°C to +85°C), and its RESET outputs remain valid down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. This makes it suitable for modern low-voltage systems using 1.8V, 1.6V, or 1.2V rails, provided the selected thresholds (2.78V/1.58V) match the intended monitoring points.
What is the reset timeout period for the MAX6351UVUT?
The MAX6351UVUT guarantees a minimum reset timeout period of 100ms, with typical values of 180ms and a maximum of 280ms under specified conditions (VCC1 > VTH1(MAX), VCC2 > VTH2(MAX)). This fixed delay is internally generated and requires no external capacitor, ensuring consistent μP reset timing across units and temperatures.
Is the MAX6351UVUT pin-compatible with other devices in the MAX6351–MAX6360 family?
The MAX6351UVUT uses the 6-pin SOT23 package and shares identical pinout with all other 6-pin variants in the family (e.g., MAX6355, MAX6356, MAX6358–MAX6360), including RST1/RST2 placement. However, function differs per variant: only MAX6351 provides dual push-pull outputs; others offer open-drain, third-voltage input, or watchdog. Pin compatibility exists physically-but not functionally-across the series.
MAX6351UVUT 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:
- 1.58V, 2.78V
- 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
MAX6351UVUT FAQ
1.How can I place an order for MAX6351UVUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351UVUT 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 MAX6351UVUT reliable?
The price and inventory of MAX6351UVUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351UVUT is usually 5 days.
3.What payment methods are accepted for MAX6351UVUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351UVUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351UVUT?
MAX6351UVUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351UVUT 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 MAX6351UVUT?
For technical support, including MAX6351UVUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351UVUT requirements.
6.How does Aetrix verify that MAX6351UVUT is sourced from the original manufacturer or authorized distributors?
All MAX6351UVUT 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 MAX6351UVUT meets industry standards.
7.What is the process for return or replacement of MAX6351UVUT?
All MAX6351UVUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351UVUT, 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 MAX6351UVUT part is unused and in its original packaging.
Return procedure for MAX6351UVUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6351UVUT Tags
-
MIC826SYMT-TR
Microchip Technology
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APX803S-31SA-7
Diodes Incorporated
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APX803L20-29SA-7
Diodes Incorporated
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TPS3828-33DBVR
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V6340RSP3B+
EM Microelectronic
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EM6325CXSP5B-2.9+
EM Microelectronic
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MCP120T-300I/TT
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MCP130T-315I/TT
Microchip Technology
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MCP120T-475I/TT
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MCP111T-300E/TT
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MCP120T-315I/TT
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MCP809T-315I/TT
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