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Analog Devices Inc./Maxim Integrated MAX6351LSUT
- Part No.:
- MAX6351LSUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6351LSUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,077
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Product details
Overview
MAX6351LSUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two independent active-low push-pull reset outputs-one referenced to VCC1 (4.63V threshold) and one to VCC2 (2.93V threshold)-designed for multivoltage systems requiring simultaneous monitoring of +5V and +3.3V 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.
For engineers reviewing the MAX6351LSUT datasheet, MAX6351LSUT pinout, MAX6351LSUT application, or MAX6351LSUT equivalent, this device supports precise dual-rail power sequencing in portable instrumentation, industrial controllers, and battery-powered embedded systems where supply integrity and deterministic reset timing are critical.
Technical Context
The MAX6351LSUT implements dual independent voltage comparators with factory-trimmed thresholds (VTH1 = 4.63V ±40mV, VTH2 = 2.93V ±40mV), each driving a dedicated push-pull output stage. Its reset assertion logic is OR-combined: either VCC1 < VTH1 or VCC2 < VTH2 triggers both RST1 and RST2 simultaneously.
It includes a debounced TTL/CMOS-compatible manual-reset input (MR) with guaranteed glitch rejection (100ns) and sub-microsecond MR-to-reset delay (0.1µs). The device requires no external components for dual-supply supervision and maintains functional reset output integrity even when one supply drops to +1.0V while the other remains valid.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±40mV at +25°C; ensures reliable reset assertion on +5V rail dropout before system instability |
| VCC2 Threshold | 2.93V ±40mV at +25°C; precisely monitors +3.3V domain without external resistor divider |
| Supply Current | 20µA typical; enables long battery life in portable equipment with continuous supervision |
| Reset Pulse Width | 100ms minimum; meets μP reset hold-time requirements across temperature and voltage corners |
| Operating Temp | –40°C to +85°C; fully specified for industrial and automotive-adjacent embedded applications |
| Reset Output Type | Two active-low push-pull outputs (RST1@VCC1, RST2@VCC2); eliminates need for external pull-ups and supports direct µP reset pin drive |
| Reset Validity | Guaranteed as long as VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; ensures fail-safe behavior during brownout recovery |
Pinout & Package
MAX6351LSUT is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and 1.1mm max height-compatible with high-density PCB layouts and reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; asserts when VCC1 < 4.63V or VCC2 < 2.93V |
| 2 | GND | Analog/digital ground reference for all internal comparators and output drivers |
| 3 | MR | Debounced manual-reset input; low pulse ≥1µs forces RST1/RST2 active regardless of supply status |
| 4 | VCC2 | Secondary supply input and monitor rail; powers internal circuitry when VCC2 > VCC1, monitors 2.93V threshold |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; synchronized with RST1 but driven from VCC2 domain |
| 6 | VCC1 | Primary supply input and monitor rail; powers internal circuitry when VCC1 > VCC2, monitors 4.63V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Factory-trimmed 4.63V/2.93V thresholds eliminate calibration overhead and external resistors |
| Push-pull reset outputs | RST1 and RST2 drive directly into µP reset pins without pull-up resistors-reducing BOM count and board area |
| Low-power operation | 20µA supply current enables always-on supervision in energy-constrained battery systems |
| Brownout resilience | RESET remains valid down to VCC1 = 1.0V or VCC2 = 1.0V-ensuring deterministic behavior during gradual supply collapse |
| Transient immunity | Immune to VCC transients ≤100ns at 100mV overdrive-prevents false resets from digital noise coupling |
Applications
| Portable Medical Instrumentation | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered handheld diagnostic device with separate +5V analog front-end and +3.3V digital controller rails. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring coordinated reset of ADC, MCU, and display driver upon any rail undervoltage event. Use Value: Prevents partial initialization and firmware corruption by asserting both RST1 and RST2 simultaneously when either rail dips below specification. |
Use Scenario: DIN-rail mounted programmable logic controller with isolated +5V field-side and +3.3V logic-side supplies. IC Role / Device Role / Timing Role: Fault-detection interface between power distribution and CPU subsystem-monitors rail integrity prior to boot sequence. Use Value: Guarantees reset pulse width ≥100ms across –40°C to +85°C, satisfying industrial µP reset timing requirements without derating. |
| Automotive Infotainment Head Units | Multivoltage Test & Measurement Equipment |
Use Scenario: In-vehicle infotainment system with +5V USB host, +3.3V SoC core, and variable battery input. IC Role / Device Role / Timing Role: Primary power-good monitor that initiates safe shutdown and state preservation before VCC1/VCC2 collapse. Use Value: Push-pull outputs drive reset lines directly-eliminating weak pull-ups vulnerable to EMI in noisy automotive environments. |
Use Scenario: Benchtop oscilloscope with separate +5V analog acquisition, +3.3V FPGA control, and +1.8V memory rails. IC Role / Device Role / Timing Role: First-line voltage integrity checker enabling deterministic power-up sequencing and fault isolation. Use Value: Valid reset output down to 1.0V per rail allows graceful degradation detection during controlled power ramp tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6353LSUT | Single active-low push-pull reset output (RST referenced to VCC1 only); same VCC1/VCC2 thresholds and 5-pin SOT23 package | Lacks RST2 output-suitable only when only one reset signal is required or VCC2 monitoring is for internal logic only | Select MAX6353LSUT if system uses only one µP reset input and VCC2 supervision serves secondary logic validation |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); open-drain output; no VCC2 monitoring or dual-rail capability | Requires external resistor divider to monitor second rail; lacks simultaneous dual-threshold assertion logic | Choose TPS3808G33DBVR only for single-rail systems where cost-per-channel is prioritized over integrated dual monitoring |
Compared with MAX6351LSUT, MAX6353LSUT reduces pin count and cost but sacrifices independent VCC2-referenced reset signaling, while TPS3808G33DBVR offers lower unit price but demands additional components and design effort to achieve dual-rail coverage.
Availability
MAX6351LSUT is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC I/O modules, and automotive infotainment head units requiring stable component supply, extended temperature operation, and deterministic dual-rail reset behavior.
Supply support for MAX6351LSUT 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, mixed-signal, and power management ICs for demanding industrial, communications, and computing applications.
The MAX6351–MAX6360 family was engineered specifically for multivoltage embedded systems needing simultaneous, factory-calibrated monitoring of two or three independent supply rails without external components.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6351LSUT?
The MAX6351LSUT has a factory-set VCC1 threshold of 4.63V ±40mV (min 4.59V, max 4.67V) and VCC2 threshold of 2.93V ±40mV (min 2.89V, max 2.97V), both specified over –40°C to +85°C. These values are laser-trimmed during production and do not require external calibration. The 'LS' suffix in MAX6351LSUT explicitly denotes this 4.63V/2.93V combination per the Voltage Threshold Levels table.
Does the MAX6351LSUT provide watchdog timer functionality?
No, the MAX6351LSUT does not include a watchdog timer. Watchdog capability is exclusive to the MAX6358/MAX6359/MAX6360 variants in the family. The MAX6351LSUT provides only dual-voltage monitoring with manual reset and two push-pull reset outputs. Its ordering code lacks the 'W', 'X', or 'Y' suffixes associated with watchdog-enabled versions.
Can the MAX6351LSUT operate with VCC1 and VCC2 supplied from different sources, such as a battery and a DC-DC converter?
Yes, the MAX6351LSUT is explicitly designed for exactly this configuration: VCC1 and VCC2 may be independently sourced, powered, and sequenced. Its internal architecture guarantees valid reset outputs as long as either supply remains ≥1.0V, and its dual comparator inputs tolerate mismatched rise/fall times and voltage levels-making it ideal for hybrid power architectures found in portable and industrial systems.
What is the maximum allowable voltage on the MR pin of the MAX6351LSUT?
The MR pin voltage must not exceed VCC1, as stated in the Pin Description section. For the MAX6351LSUT operating with VCC1 = 5V nominal, MR must remain ≤5V. The datasheet specifies MR input voltage limits as 0.8V (VIL) and 2.3V (VIH) for L/M-suffix devices, confirming TTL/CMOS compatibility. Exceeding VCC1 risks damage due to internal diode conduction.
Is the MAX6351LSUT RoHS compliant and available in lead-free packaging?
Yes, the MAX6351LSUT is RoHS compliant. Per the Ordering Information section, lead-free versions are designated by replacing the '-T' suffix with '+T' (e.g., MAX6351LSUT+T). Standard tape-and-reel packaging is used, with a 2500-piece minimum order quantity for the SOT23 package. Both leaded and lead-free variants share identical electrical specifications and thermal performance.
MAX6351LSUT 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:
- 2.93V, 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-23-6
MAX6351LSUT FAQ
1.How can I place an order for MAX6351LSUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6351LSUT 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 MAX6351LSUT reliable?
The price and inventory of MAX6351LSUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6351LSUT is usually 5 days.
3.What payment methods are accepted for MAX6351LSUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6351LSUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6351LSUT?
MAX6351LSUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6351LSUT 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 MAX6351LSUT?
For technical support, including MAX6351LSUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6351LSUT requirements.
6.How does Aetrix verify that MAX6351LSUT is sourced from the original manufacturer or authorized distributors?
All MAX6351LSUT 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 MAX6351LSUT meets industry standards.
7.What is the process for return or replacement of MAX6351LSUT?
All MAX6351LSUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6351LSUT, 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 MAX6351LSUT part is unused and in its original packaging.
Return procedure for MAX6351LSUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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