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Analog Devices Inc./Maxim Integrated MAX6351LRUT+T
- Part No.:
- MAX6351LRUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351LRUT+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,641
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Product details
Overview
MAX6351LRUT+T 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), the other to VCC2 (2.63V threshold)-designed for multivoltage systems requiring precise, independent monitoring of +5V and +2.5V rails in industrial controllers and portable equipment.
For engineers reviewing the MAX6351LRUT+T datasheet, MAX6351LRUT+T pinout, MAX6351LRUT+T application, or MAX6351LRUT+T equivalent, key selection criteria include guaranteed RESET validity down to VCC1 = 1.0V or VCC2 = 1.0V, 20µA quiescent current, 100ms minimum power-on-reset pulse width, and dual-supply transient immunity without external components.
Technical Context
The MAX6351LRUT+T implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.63V ±40mV, VTH2 = 2.63V ±40mV) and integrated glitch-filtered manual-reset input. Its push-pull architecture eliminates external pull-up resistors for both RST1 (VCC1-referenced) and RST2 (VCC2-referenced) outputs.
It guarantees functional operation across –40°C to +85°C with <20ppm/°C reset threshold tempco and supports supply voltages from 1.2V to 5.5V on both VCC1 and VCC2. The device asserts reset if either supply drops below its respective threshold and maintains valid output states as long as at least one supply remains ≥1.0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±40mV at +25°C; ensures reliable reset assertion when primary +5V rail sags below 4.59V |
| VCC2 Threshold | 2.63V ±40mV at +25°C; triggers reset on secondary +2.5V rail drop below 2.59V |
| Supply Current | 20µA typical; enables battery-backed operation in portable systems with minimal standby drain |
| Reset Pulse Width | 100ms minimum; meets μP reset timing requirements for stable initialization |
| Operating Temp | –40°C to +85°C; fully specified for industrial embedded applications without derating |
| RESET Validity | Guaranteed while VCC1 ≥1.0V or VCC2 ≥1.0V; supports brownout detection down to near-undervoltage conditions |
| Package | 6-pin SOT23; footprint-compatible with industry-standard compact PCB layouts |
Pinout & Package
MAX6351LRUT+T is housed in a 6-pin SOT23 package (package code U6-1), with 0.95mm pitch, 2.9mm × 1.6mm body size, and exposed pad not present. Pin 1 is RST1 (active-low push-pull, VCC1-referenced); Pin 5 is RST2 (active-low push-pull, VCC2-referenced); Pin 6 is VCC1; Pin 4 is VCC2; Pin 3 is MR (debounced manual-reset input); Pin 2 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives low without external pull-up during fault |
| 2 | GND | Ground reference for all internal comparators, reset generator, and MR input |
| 3 | MR | Debounced TTL/CMOS-compatible manual-reset input; forces reset when pulled low |
| 4 | VCC2 | Secondary supply input and monitored voltage rail; powers internal circuitry when >VCC1 |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; independent timing from RST1 |
| 6 | VCC1 | Primary supply input and monitored voltage rail; powers internal circuitry when >VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | RST1 and RST2 operate independently-each tied to its own supply rail and threshold, enabling simultaneous but decoupled reset signaling for heterogeneous power domains |
| No external components required | Eliminates need for pull-up resistors, RC networks, or discrete comparators in dual-rail monitoring, reducing BOM count and board area |
| Low-power supervision | 20µA supply current allows integration into always-on subsystems without compromising battery life in portable equipment |
| Extended supply validity | RESET remains asserted and valid even as VCC1 or VCC2 falls to 1.0V-critical for detecting deep brownouts before system collapse |
| Transient-immune design | Rejects short negative-going VCC transients up to 200ns (at 100mV overdrive), preventing false resets in noisy industrial environments |
Applications
| Industrial PLC Controllers | Portable Medical Monitors |
|---|---|
Use Scenario: A programmable logic controller uses separate +5V and +2.5V rails to power its FPGA core and analog front-end sensors. IC Role / Device Role / Timing Role: MAX6351LRUT+T continuously monitors both rails and asserts RST1 and RST2 independently to hold the FPGA and ADC in reset until both supplies stabilize within tolerance. Use Value: Prevents partial initialization and metastability by ensuring coordinated release only after both rails exceed 4.59V and 2.59V respectively, with no external timing components needed. |
Use Scenario: A handheld ECG monitor operates from a single Li-ion cell with DC-DC converters generating +5V (digital) and +2.5V (analog) rails. IC Role / Device Role / Timing Role: MAX6351LRUT+T provides rail-specific reset signaling to the MCU and analog signal chain, with RST1 holding digital logic and RST2 holding analog biasing circuits. Use Value: Enables safe power sequencing and brownout recovery down to 1.0V on either rail-extending usable battery range while guaranteeing deterministic startup. |
| Multivoltage Embedded Gateways | Intelligent Power Meters |
Use Scenario: An IoT gateway integrates ARM Cortex-M7 (powered by +3.3V), RF transceiver (+2.5V), and secure element (+1.8V via LDO). IC Role / Device Role / Timing Role: MAX6351LRUT+T monitors the upstream +5V and intermediate +2.5V rails feeding those domains, asserting RST1/RST2 to gate power-enable signals. Use Value: Provides hardware-level coordination between power domains-ensuring the RF transceiver is fully powered before the MCU attempts communication. |
Use Scenario: A DIN-rail mounted electricity meter uses +5V for display and communications, and +2.5V for precision metrology ADCs. IC Role / Device Role / Timing Role: MAX6351LRUT+T monitors both rails and generates synchronized reset pulses to isolate metering firmware from display firmware during supply disturbances. Use Value: Maintains data integrity during grid transients by keeping metrology subsystem active longer than UI subsystem-enabling accurate energy capture during brief dips. |
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+T | Single active-low push-pull RST output referenced to VCC1 only; 5-pin SOT23; no RST2 output | Suitable only where only primary rail supervision is required; lacks independent secondary-rail reset signaling | Select when system uses only one critical rail or routes secondary reset externally |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); open-drain output; no dual-rail monitoring capability | Requires external resistor network and second supervisor IC to replicate dual-threshold functionality | Choose only for cost-sensitive single-rail designs where dual monitoring is unnecessary |
Compared with MAX6353LRUK+T and TPS3808G33DBVR, the MAX6351LRUT+T uniquely delivers two independent, rail-referenced push-pull reset outputs in one 6-pin SOT23 package-eliminating layout complexity, external components, and timing mismatches inherent in multi-IC solutions.
Availability
MAX6351LRUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, multivoltage embedded gateways, intelligent power meters, and battery-powered instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX6351LRUT+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX6351–MAX6360 family was designed specifically for multivoltage microprocessor systems requiring precise, low-power, and component-free supervision of two or three independent supply rails.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351LRUT+T?
The MAX6351LRUT+T has a factory-set VCC1 threshold of 4.63V (±40mV over –40°C to +85°C) and a VCC2 threshold of 2.63V (±40mV over the same temperature range). These values are laser-trimmed and guaranteed-not typical-making them suitable for precision power-rail monitoring in industrial control systems where margin-critical reset behavior is required. The "LR" suffix in MAX6351LRUT+T directly encodes these thresholds per Maxim's ordering nomenclature.
Does the MAX6351LRUT+T support operation with supply voltages below 1.2V?
No-the MAX6351LRUT+T specifies a minimum operating supply voltage of 1.2V for both VCC1 and VCC2 across the full –40°C to +85°C temperature range. However, its RESET outputs remain valid and asserted as long as either VCC1 or VCC2 stays ≥1.0V, enabling reliable brownout detection down to that level. This distinction ensures fail-safe behavior during deep undervoltage events without requiring continuous operation below 1.2V.
Can the MAX6351LRUT+T replace a discrete dual-supervisor solution using two separate ICs?
Yes-the MAX6351LRUT+T replaces discrete dual-supervisor implementations by integrating two independent voltage comparators, dual push-pull reset drivers, and a debounced manual-reset input into a single 6-pin SOT23 package. It eliminates external pull-ups, reduces PCB area by >40%, removes inter-IC timing skew, and guarantees correlated reset assertion timing-making it a direct functional and space-saving upgrade over dual-IC approaches.
Is the manual-reset input (MR) of the MAX6351LRUT+T compatible with 1.8V logic levels?
Yes-the MR input of the MAX6351LRUT+T is TTL/CMOS-compatible and accepts logic-low signals down to 0.8V (for L/M-suffix devices) and logic-high signals up to 2.3V minimum. When interfaced with 1.8V GPIOs, the MR pin functions correctly because its VIH threshold (2.3V min) is safely exceeded and its VIL threshold (0.8V max) is comfortably met-no level-shifting circuitry is required for standard 1.8V microcontrollers.
What is the maximum transient duration the MAX6351LRUT+T can ignore on VCC1 or VCC2?
The MAX6351LRUT+T rejects negative-going transients on VCC1 or VCC2 up to 200ns in duration when the overdrive is 100mV below the respective threshold voltage, as confirmed by the "Maximum VCC Transient Duration vs. Reset Threshold Overdrive" graph in the datasheet. This immunity prevents false resets caused by switching noise or coupling spikes in motor-driven or high-current industrial environments-ensuring robust operation without added filtering components.
MAX6351LRUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX6351LRUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351LRUT+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 MAX6351LRUT+T reliable?
The price and inventory of MAX6351LRUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351LRUT+T is usually 5 days.
3.What payment methods are accepted for MAX6351LRUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351LRUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351LRUT+T?
MAX6351LRUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351LRUT+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 MAX6351LRUT+T?
For technical support, including MAX6351LRUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351LRUT+T requirements.
6.How does Aetrix verify that MAX6351LRUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6351LRUT+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 MAX6351LRUT+T meets industry standards.
7.What is the process for return or replacement of MAX6351LRUT+T?
All MAX6351LRUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351LRUT+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 MAX6351LRUT+T part is unused and in its original packaging.
Return procedure for MAX6351LRUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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