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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:3,048
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Product details
Overview
The MAX6351LSUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with two active-low push-pull reset outputs-RST1 referenced to VCC1 and RST2 referenced to VCC2-designed for multivoltage systems requiring precise, independent monitoring of +4.63V (VCC1) and +2.93V (VCC2) rails. It delivers 20µA supply current, 100ms min reset pulse width, and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. Used in portable battery-powered equipment and intelligent instruments where dual-rail integrity is critical.
For engineers reviewing the MAX6351LSUT+ datasheet, MAX6351LSUT+ pinout, MAX6351LSUT+ application, or MAX6351LSUT+ equivalent, key selection considerations include its dual-threshold precision (±0.09V at +25°C), SOT23-6 package compatibility, manual-reset debouncing, and absence of watchdog timer-distinguishing it from MAX6359/MAX6360 variants.
Technical Context
The MAX6351LSUT+ implements independent voltage comparators for VCC1 and VCC2, each with factory-trimmed thresholds (4.63V ±0.09V and 2.93V ±0.05V), hysteresis of ~0.1% of threshold, and temperature coefficient of 20ppm/°C. Reset assertion occurs if either supply drops below its trip point, and both RST1 and RST2 remain valid as long as at least one supply exceeds +1.0V.
It features TTL/CMOS-compatible debounced manual-reset input (MR) with 1µs minimum pulse width and 100ns glitch rejection, and operates across -40°C to +85°C without external components. No watchdog timer or third-voltage monitor is included-confirming its role as a dedicated dual-supply supervisor without extended system-level fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±0.09V at +25°C; ensures reliable reset assertion when primary 4.63V rail drops below specification. |
| VCC2 Threshold | 2.93V ±0.05V at +25°C; enables accurate supervision of secondary 2.93V logic or I/O rail. |
| Supply Current | 20µA typical; minimizes quiescent power draw in battery-critical applications. |
| Reset Pulse Width | 100ms minimum; guarantees sufficient duration to fully reset microprocessors and peripherals. |
| Operating Temp | -40°C to +85°C; supports industrial and extended-temperature embedded deployments. |
| RESET Validity | Valid down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V; maintains functional reset capability during brownout conditions. |
| Reset Delay | 20µs max after VCC overdrive; provides fast response to supply transients exceeding threshold. |
Pinout & Package
MAX6351LSUT+ is housed in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175), surface-mount compatible with standard reflow profiles and footprint-constrained PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST1 | Active-low push-pull reset output referenced to VCC1; drives low independently when VCC1 falls below 4.63V. |
| 2 | GND | Ground reference for all internal comparators and logic; must be connected to system common ground. |
| 3 | MR | Debounced manual-reset input; pulling low forces both RST1 and RST2 active for timeout period. |
| 4 | VCC2 | Secondary supply input and monitor rail; powers device when above VCC1 and triggers RST2 if <2.93V. |
| 5 | RST2 | Active-low push-pull reset output referenced to VCC2; asserts when VCC2 drops below 2.93V. |
| 6 | VCC1 | Primary supply input and monitor rail; powers device when above VCC2 and triggers RST1 if <4.63V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of two distinct supply rails (4.63V and 2.93V) with separate reset outputs-eliminates need for discrete comparators or dual ICs. |
| Push-pull reset outputs | RST1 and RST2 drive actively low without external pull-ups, reducing BOM count and ensuring deterministic logic levels under load. |
| Low-power operation | 20µA supply current enables integration into always-on subsystems without compromising battery life. |
| Extended supply validity | RESET remains asserted and valid even as VCC1 or VCC2 decays to 1.0V-critical for controlled shutdown sequencing. |
| Transient-immune design | Rejects short negative-going VCC transients up to 250µs (at 1V overdrive), preventing false resets in noisy environments. |
Applications
| Portable/Battery-Powered Equipment | Intelligent Instruments |
|---|---|
Use Scenario: Handheld test meters and data loggers powered by single-cell Li-ion batteries with regulated 4.63V and 2.93V rails. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring coordinated reset of MCU and analog front-end during battery sag or cold-start. Use Value: Prevents erratic behavior by asserting both RST1 and RST2 simultaneously when either rail dips-enabling clean boot without software intervention. | Use Scenario: Digital multimeters with isolated ADC sections requiring stable 4.63V reference and 2.93V digital core supply. IC Role / Device Role / Timing Role: Independent voltage monitor generating rail-specific reset signals to isolate fault propagation between analog and digital domains. Use Value: Guarantees RST2 remains valid down to VCC2 = 1.0V, allowing safe ADC shutdown before digital logic collapses. |
| Computers | Multivoltage Systems |
Use Scenario: Embedded control modules in industrial PCs with dual-core SoCs supplied by 4.63V I/O and 2.93V core rails. IC Role / Device Role / Timing Role: Supervisor coordinating reset timing across heterogeneous voltage domains to prevent metastability during power-up. Use Value: 100ms min reset pulse width satisfies Intel/AMD reset timing requirements while eliminating external RC networks. | Use Scenario: FPGA-based communication gateways using 4.63V transceiver banks and 2.93V configuration logic. IC Role / Device Role / Timing Role: Dual-threshold supervisor enforcing strict power sequencing-ensuring transceivers initialize only after configuration logic is stable. Use Value: Factory-trimmed thresholds (±0.09V/±0.05V) eliminate calibration overhead and ensure repeatable startup across production units. |
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 RST output referenced to VCC1 only; no RST2; same VCC1/VCC2 thresholds and SOT23-6 package. | Lacks independent supervision of VCC2 rail-suitable only when secondary rail reset is not required. | Select MAX6353LSUT+ if system uses only one critical reset signal tied to VCC1 and VCC2 monitoring is purely diagnostic. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); open-drain output; no dual-rail capability; 5-pin SOT23 package. | Cannot monitor two supplies simultaneously; requires external pull-up and additional circuitry for dual-rail use. | Choose TPS3808G33DBVR only for cost-sensitive single-rail applications where footprint and feature set align. |
Compared with MAX6351LSUT+, MAX6353LSUT+ reduces reset flexibility by omitting RST2, while TPS3808G33DBVR lacks dual-threshold architecture entirely-making MAX6351LSUT+ the sole option for true independent dual-rail reset generation in compact SOT23-6 form factor.
Availability
MAX6351LSUT+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, intelligent instruments, and multivoltage systems requiring stable component supply, precise dual-threshold supervision, and industrial temperature operation.
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 high-performance analog and mixed-signal semiconductor solutions for industrial, communications, and computing markets.
The MAX6351–MAX6360 product line delivers precision dual- and triple-voltage supervisors optimized for reliability-critical embedded systems where simultaneous multi-rail monitoring and deterministic reset behavior are mandatory.
FAQ
What is the function of the MR pin on the MAX6351LSUT+?
The MR (Manual Reset) pin on the MAX6351LSUT+ is a debounced, TTL/CMOS-compatible input that forces both RST1 and RST2 active-low when pulled low. Its 1µs minimum pulse width and 100ns glitch rejection ensure noise immunity. When released, reset remains asserted for the timeout period (100–280ms). MAX6351LSUT+ requires MR to be tied to VCC1 if unused-never left floating-to prevent unintended resets.
Does the MAX6351LSUT+ include a watchdog timer?
No, the MAX6351LSUT+ does not include a watchdog timer. Watchdog functionality is exclusive to MAX6358/MAX6359/MAX6360 variants in the family. The MAX6351LSUT+ is strictly a dual-voltage supervisor with RST1 and RST2 outputs, manual reset, and no WDI pin-confirmed by its pin configuration (pins 1=RST1, 5=RST2, 6=VCC1) and absence of watchdog-related electrical specs in its datasheet section.
What are the exact voltage thresholds monitored by the MAX6351LSUT+?
The MAX6351LSUT+ monitors VCC1 at 4.63V ±0.09V (min 4.54V, max 4.72V at +25°C) and VCC2 at 2.93V ±0.05V (min 2.88V, max 2.98V at +25°C), per the Voltage-Threshold Levels table and Electrical Characteristics. These are factory-trimmed, temperature-stable thresholds with 20ppm/°C tempco-guaranteed over -40°C to +85°C.
Can the MAX6351LSUT+ operate with supply voltages below 1.2V?
The MAX6351LSUT+ guarantees RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, but its specified operating range begins at 1.2V (per Absolute Maximum Ratings and Electrical Characteristics). Below 1.2V, functionality is not characterized-only reset output state is assured. For reliable operation, maintain VCC1 and VCC2 within 1.2V–5.5V; MAX6351LSUT+ will assert reset if either drops below its threshold, even during decay to 1.0V.
Is the MAX6351LSUT+ pin-compatible with other devices in the MAX6351–MAX6360 family?
Yes, the MAX6351LSUT+ shares the 6-pin SOT23 (U6-1) package and identical pinout with MAX6355/MAX6356/MAX6357/MAX6358/MAX6359/MAX6360-pin 1=RST1, pin 2=GND, pin 3=MR, pin 4=VCC2, pin 5=RST2, pin 6=VCC1. However, functional compatibility depends on variant: MAX6352/55/58 use open-drain RST, while MAX6351LSUT+ uses push-pull RST1/RST2-requiring schematic review before substitution.
MAX6351LSUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Strip
- Product Status:
- Obsolete
- Programmable:
- -
- 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-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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