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Analog Devices Inc./Maxim Integrated MAX6359MSUT
- Part No.:
- MAX6359MSUT
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6359MSUT.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,015
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Product details
Overview
MAX6359MSUT from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset referenced to VCC1, 4.38V/2.93V factory-set thresholds, watchdog timer (46.4s startup / 2.9s normal timeout), and operation from -40°C to +85°C in 6-pin SOT23. It monitors two independent supply rails and asserts reset if either drops below its threshold, supporting reliable boot sequencing in multivoltage embedded systems.
For engineers reviewing the MAX6359MSUT datasheet, MAX6359MSUT pinout, MAX6359MSUT application, or MAX6359MSUT equivalent, key selection factors include dual-supply monitoring capability, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, 20µA quiescent current, and integrated watchdog with configurable startup timing-critical for industrial controllers and battery-powered instrumentation.
Technical Context
The MAX6359MSUT implements a dual-threshold comparator architecture with independent VCC1 and VCC2 inputs, each feeding a precision voltage reference and hysteresis-controlled trip point. Its reset generator guarantees output assertion when either supply falls below its specified threshold (4.38V for VCC1, 2.93V for VCC2), with 100ms minimum reset pulse width and 20µA total supply current.
It integrates a dual-mode watchdog timer: a 46.4s startup timeout enables full system initialization after power-up or manual reset, followed by a 2.9s normal timeout requiring periodic WDI transitions. The active-low push-pull RST output is referenced to VCC1 and remains valid as long as VCC1 ≥ 1V or VCC2 ≥ 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.38V ±0.08V at +25°C; ensures reliable reset assertion when primary supply drops below nominal 4.5V rail |
| VCC2 Threshold | 2.93V ±0.05V at +25°C; monitors secondary 3.0V or 3.3V domain with tight tolerance |
| Supply Current | 20µA typical; enables long battery life in portable equipment without compromising supervision accuracy |
| Reset Pulse Width | 100–280ms; exceeds minimum 100ms requirement for most µP reset hold times |
| Watchdog Timeout | 46.4s startup / 2.9s normal; prevents premature reset during boot while enabling rapid fault detection post-initialization |
| Operating Temp | -40°C to +85°C; supports industrial and automotive under-hood environments |
| Reset Output Type | Active-low push-pull referenced to VCC1; eliminates external pull-up and ensures clean logic-level drive into µP reset pin |
Pinout & Package
MAX6359MSUT 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 | RST | Active-low push-pull reset output referenced to VCC1; drives µP reset pin directly without external components |
| 2 | GND | Analog/digital ground reference; must be connected to system ground plane for stable threshold accuracy |
| 3 | MR | Debounced active-low manual-reset input; forces reset when pulled low, with glitch rejection and internal pullup (~63.5kΩ) |
| 4 | VCC2 | Secondary supply input and monitor rail; powers device when above VCC1 and triggers reset if <2.93V |
| 5 | WDI | Watchdog input; requires rising/falling edge every ≤2.9s in normal mode; left unconnected disables watchdog |
| 6 | VCC1 | Primary supply input and monitor rail; powers device when above VCC2 and triggers reset if <4.38V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously tracks VCC1 (4.38V) and VCC2 (2.93V) with separate comparators-enables robust power sequencing in mixed-rail systems |
| Guaranteed RESET validity to 1V | Output remains functional even as VCC1 or VCC2 decays to 1.0V, ensuring reset integrity during brownout conditions |
| Integrated dual-mode watchdog | 46.4s startup timeout accommodates complex firmware initialization; 2.9s normal timeout detects processor lockup within sub-3-second window |
| No external components required | Factory-trimmed thresholds and internal MR pullup eliminate resistors/capacitors-reduces BOM count and layout area |
| Power-supply transient immunity | Rejects short negative-going transients on VCC1/VCC2 per published graphs-prevents false resets in noisy power environments |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Monitoring 5V logic supply and 3.3V I/O rail in programmable logic controller modules operating in factory-floor environments with fluctuating input power. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail dips below specification, with watchdog guarding against firmware hangs during cyclic scan execution. Use Value: Prevents corrupted state machine operation by guaranteeing clean reset during undervoltage events and detecting stalled CPU execution within 2.9 seconds. | Use Scenario: Power management in handheld environmental sensors powered by single-cell Li-ion batteries, where VCC1 = 3.3V (MCU core) and VCC2 = 2.93V (sensor interface). IC Role / Device Role / Timing Role: Low-current (20µA) supervisor maintaining reset integrity down to 1V per rail, enabling graceful shutdown before battery depletion. Use Value: Extends usable battery life while ensuring MCU reset remains asserted until both supplies collapse-eliminates erratic behavior during deep discharge. |
| Medical Diagnostic Handhelds | Automotive Infotainment Modules |
Use Scenario: Supervising dual-rail power domains (4.38V analog front-end and 2.93V digital subsystem) in portable ultrasound devices requiring FDA-grade reliability. IC Role / Device Role / Timing Role: Precision threshold monitoring with <20ppm/°C tempco and guaranteed operation across -40°C to +85°C ambient range. Use Value: Meets stringent medical safety requirements by preventing operation outside validated voltage windows and providing deterministic reset timing. | Use Scenario: Reset coordination between 5V infotainment head-unit processor and 3.3V CAN transceiver in vehicle dashboard systems exposed to load-dump transients. IC Role / Device Role / Timing Role: Transient-immune dual-supply monitor with debounced MR input for ignition-key triggered reset and watchdog coverage of software execution. Use Value: Maintains system stability during automotive electrical disturbances and ensures rapid recovery from software faults without requiring host MCU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6359MTUT | VCC1 threshold = 4.38V, VCC2 threshold = 3.08V (vs. 2.93V); same package, watchdog, and pinout | Suitable for systems with 3.0V secondary rail instead of 2.93V; identical timing and current specs | Select MAX6359MTUT when monitoring a 3.0V domain; MAX6359MSUT is optimal for 2.9V or 2.93V rails. |
| TPS3808G33 | Single-supply monitor (3.3V only); no VCC2 input or dual-threshold capability; 35µA supply current | Requires external circuitry to supervise two rails; lacks integrated watchdog timer | Use only if monitoring one rail; MAX6359MSUT provides true dual-rail supervision with watchdog in same footprint. |
Compared with MAX6359MTUT, MAX6359MSUT offers tighter VCC2 threshold matching for 2.93V systems, while versus TPS3808G33 it delivers integrated dual-rail monitoring and watchdog functionality-reducing component count and improving system-level reliability without layout changes.
Availability
MAX6359MSUT is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical diagnostic handhelds, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6359MSUT 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, computing, and communications applications, emphasizing high reliability and low power.
The MAX6351–MAX6360 family targets multivoltage embedded systems requiring guaranteed reset integrity, dual-supply monitoring, and integrated watchdog protection-optimized for space-constrained, thermally demanding environments.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6359MSUT?
The MAX6359MSUT has a factory-set VCC1 threshold of 4.38V (±0.08V at +25°C) and VCC2 threshold of 2.93V (±0.05V at +25°C), with guaranteed operation over -40°C to +85°C. These values are laser-trimmed and documented in the Electrical Characteristics table of the MAX6359MSUT datasheet; no external adjustment is required.
Does the MAX6359MSUT provide a watchdog timer, and what are its timeout periods?
Yes, the MAX6359MSUT includes an integrated dual-mode watchdog timer: a 46.4s startup timeout period after power-up or manual reset, followed by a 2.9s normal timeout period requiring periodic WDI transitions. This architecture ensures safe system initialization while enabling rapid detection of processor lockup during runtime-both timeouts are fully specified in the MAX6359MSUT electrical characteristics.
What is the function of Pin 5 (WDI) on the MAX6359MSUT, and how should it be used?
Pin 5 of the MAX6359MSUT is the Watchdog Input (WDI). To keep the device from asserting reset, the host µP must generate a rising or falling edge on WDI at least once every 2.9 seconds during normal operation. Leaving WDI unconnected disables the watchdog function. The MAX6359MSUT datasheet specifies WDI input voltage levels, pulse width, and current requirements for reliable interfacing.
Is the MAX6359MSUT reset output push-pull or open-drain, and what is its voltage reference?
The MAX6359MSUT features an active-low push-pull reset output (Pin 1, labeled RST) referenced to VCC1. It does not require an external pull-up resistor and can sink up to 3.2mA at VCC1 ≥ 4.5V while maintaining VOL ≤ 0.4V. This configuration ensures direct, robust driving of µP reset pins-distinct from open-drain variants like the MAX6358MSUT.
What package type and pin count does the MAX6359MSUT use, and is it RoHS-compliant?
The MAX6359MSUT is supplied in a 6-pin SOT23 package (U6-1 outline, land pattern 90-0175) with RoHS-compliant lead-free construction. The "+T" suffix denotes lead-free packaging; the standard MAX6359MSUT uses lead(Pb)-free materials and meets JEDEC J-STD-020 moisture sensitivity level 1 specifications for reflow compatibility.
MAX6359MSUT 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, 4.38V
- 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
MAX6359MSUT FAQ
1.How can I place an order for MAX6359MSUT through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6359MSUT 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 MAX6359MSUT reliable?
The price and inventory of MAX6359MSUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6359MSUT is usually 5 days.
3.What payment methods are accepted for MAX6359MSUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6359MSUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6359MSUT?
MAX6359MSUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6359MSUT 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 MAX6359MSUT?
For technical support, including MAX6359MSUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6359MSUT requirements.
6.How does Aetrix verify that MAX6359MSUT is sourced from the original manufacturer or authorized distributors?
All MAX6359MSUT 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 MAX6359MSUT meets industry standards.
7.What is the process for return or replacement of MAX6359MSUT?
All MAX6359MSUT units undergo pre-shipment inspection (PSI). If there is an issue with MAX6359MSUT, 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 MAX6359MSUT part is unused and in its original packaging.
Return procedure for MAX6359MSUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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