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Analog Devices Inc./Maxim Integrated MAX6359SVUT+T
- Part No.:
- MAX6359SVUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6359SVUT+T.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,887
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Product details
Overview
MAX6359SVUT+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset referenced to VCC1, factory-set VCC1 threshold of 2.93V and VCC2 threshold of 1.58V, watchdog timer (46.4s startup / 2.9s normal timeout), and guaranteed RESET validity down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used in multivoltage embedded systems requiring reliable power-on reset and processor activity monitoring.
For engineers reviewing the MAX6359SVUT+T datasheet, MAX6359SVUT+T pinout, MAX6359SVUT+T application, or MAX6359SVUT+T equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, watchdog timing behavior, reset output drive capability, and validated alternative parts for dual-supply voltage monitoring with manual reset and watchdog functionality.
Technical Context
The MAX6359SVUT+T implements a dual-threshold comparator architecture monitoring two independent supply rails (VCC1 and VCC2), asserting reset whenever either drops below its precise factory-trimmed threshold (2.93V/1.58V). Its internal watchdog timer operates in two distinct modes: a 46.4s startup timeout enables full system initialization before watchdog supervision begins, followed by a 2.9s normal timeout for rapid fault detection.
Reset assertion is guaranteed as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V, enabling robust operation during brownout conditions. The active-low push-pull RST output is referenced to VCC1 and sinks up to 1.2mA at VCC1 ≥ 2.7V (VOL = 0.3V), eliminating external pull-up requirements and supporting direct interface to CMOS/TTL logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 2.93V ±0.05V at +25°C; stable over -40°C to +85°C (±0.15V max variation) - ensures accurate reset initiation for 3.0V nominal rails. |
| VCC2 Threshold | 1.58V ±0.03V at +25°C; guaranteed over temperature - enables reliable monitoring of low-voltage auxiliary rails (e.g., 1.8V/1.5V domains). |
| Watchdog Timeout | 46.4s startup mode / 2.9s normal mode - provides extended boot window then fast fault response without firmware intervention. |
| Reset Pulse Width | 100ms minimum - meets μP reset hold-time requirements across industrial temperature range. |
| Supply Current | 20µA typical (VCC1=5.5V, VCC2=3.6V) - enables use in battery-backed or ultra-low-power systems. |
| RESET Output Type | Active-low push-pull referenced to VCC1 - eliminates external pull-up resistor and ensures defined logic level under all valid VCC1 conditions. |
| Operating Temp | -40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
MAX6359SVUT+T is housed in a lead(Pb)-free 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), with 1.27mm pitch, 2.9mm × 1.6mm body, and thermal pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1 - drives low to reset μP; no external pull-up needed. |
| 2 | GND | Analog/digital ground reference - must be connected to system ground plane for noise immunity and threshold accuracy. |
| 3 | MR | Debounced active-low manual-reset input - forces reset when pulled low; internally pulled up (~63.5kΩ) to VCC1 if left open. |
| 4 | VCC2 | Secondary supply input - powers device and monitored for undervoltage at 1.58V threshold. |
| 5 | WDI | Watchdog input - requires edge transition every ≤2.9s in normal mode; unconnected disables watchdog. |
| 6 | VCC1 | Primary supply input - powers device and monitored for undervoltage at 2.93V threshold; references RST output. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC1 (2.93V) and VCC2 (1.58V) with separate comparators - eliminates need for discrete supervisors in dual-rail systems. |
| Guaranteed RESET validity to 1.0V | Reset remains asserted and valid even if VCC1 or VCC2 drops to 1.0V - ensures fail-safe behavior during deep brownouts. |
| Two-mode watchdog timer | 46.4s startup timeout allows full system boot before watchdog activation; 2.9s normal timeout detects processor lockup rapidly. |
| Push-pull RST output | Drives actively low with 1.2mA sink capability at VCC1 ≥ 2.7V (VOL = 0.3V) - interfaces directly to μP reset pins without external components. |
| 20µA ultra-low quiescent current | Enables integration into always-on subsystems and battery-powered equipment without significant standby drain. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Programmable logic controllers require deterministic reset sequencing and watchdog supervision during field operation with fluctuating 24V-derived 3.3V/1.5V rails. IC Role / Device Role / Timing Role: MAX6359SVUT+T monitors both rails, asserts RST on any undervoltage, and enforces processor liveness via WDI - acting as primary system integrity guardian. Use Value: Prevents silent corruption during brownout by guaranteeing reset assertion down to 1.0V on either rail, while 46.4s startup timeout accommodates complex firmware initialization. | Use Scenario: Portable ultrasound or glucose meters operate from single-cell Li-ion (3.0–4.2V) with buck-converted 1.5V analog and 2.9V digital supplies. IC Role / Device Role / Timing Role: MAX6359SVUT+T supervises the 2.93V digital rail and 1.58V analog rail, delivering synchronized reset and detecting processor hang via WDI. Use Value: 20µA supply current extends battery life; push-pull RST eliminates pull-up resistor, reducing BOM count and PCB area in space-constrained designs. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: BCMs manage lighting, door locks, and sensors using 5V MCU and 1.5V sensor interface rails exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: MAX6359SVUT+T monitors VCC1 (2.93V) and VCC2 (1.58V), providing glitch-filtered reset and watchdog coverage - critical for ASIL-B adjacent functions. Use Value: Immunity to short VCC transients (per Typical Operating Characteristics graph) prevents false resets during automotive electrical disturbances. | Use Scenario: Two-way communication meters use isolated 3.3V MCU and 1.8V RF transceiver rails powered from AC/DC conversion with variable line conditions. IC Role / Device Role / Timing Role: MAX6359SVUT+T supervises both rails and provides manual reset via front-panel button (MR input), ensuring safe restart after power interruption. Use Value: Debounced MR input rejects mechanical switch bounce; 100ms min reset pulse width satisfies meter SoC reset timing requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6359SUH+T | SOT23-6 package, identical thresholds (2.93V/1.58V), same watchdog timing, but uses standard "-UH" suffix - differs only in tape-and-reel packaging specification (not functional). | No functional difference; intended for same dual-rail monitoring with WDI and manual reset. | Select MAX6359SUH+T only if distributor inventory or logistics require alternate reel configuration; electrical and thermal performance identical. |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only), no VCC2 monitoring, no watchdog timer, 350ms reset timeout, SOT23-5 package - lacks dual-threshold and watchdog capability. | Applicable only where only one rail requires supervision and no processor activity monitoring is needed. | Choose only for simplified single-rail systems; cannot replace MAX6359SVUT+T in dual-monitoring or watchdog-required designs. |
Compared with MAX6359SUH+T (identical function, packaging variant) and TPS3808G33DBVR (single-threshold, no watchdog), the MAX6359SVUT+T uniquely delivers coordinated dual-rail supervision with integrated 46.4s/2.9s watchdog - essential for systems where both power integrity and processor liveness must be enforced simultaneously.
Availability
MAX6359SVUT+T is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical diagnostics, automotive body control modules, smart energy meters, and multivoltage embedded systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6359SVUT+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) designs precision analog, mixed-signal, and high-reliability ICs for industrial, medical, automotive, and communications applications.
The MAX6351–MAX6360 family delivers dual- and triple-voltage microprocessor supervisors with integrated watchdog timers, targeting systems requiring robust power-on reset, brownout protection, and processor activity monitoring in compact SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6359SVUT+T?
The MAX6359SVUT+T has a factory-set VCC1 threshold of 2.93V (±0.05V at +25°C, ±0.15V over -40°C to +85°C) and VCC2 threshold of 1.58V (±0.03V at +25°C, ±0.09V over temperature). These values are confirmed in the Voltage Threshold Levels table and Electrical Characteristics section of the official datasheet, and define the precise undervoltage trip points that trigger the RST output.
Does the MAX6359SVUT+T provide a watchdog timer, and what are its timeout periods?
Yes, the MAX6359SVUT+T includes a dual-mode watchdog timer with a 46.4s startup timeout period (to allow full system initialization after power-up or reset) and a 2.9s normal timeout period (for rapid detection of processor lockup during steady-state operation). These values are specified in the Electrical Characteristics table under "Watchdog Timeout Period" and are guaranteed over the full -40°C to +85°C operating range.
What type of reset output does the MAX6359SVUT+T feature, and how is it driven?
MAX6359SVUT+T features an active-low push-pull reset output (RST pin) referenced to VCC1. It actively drives low with up to 1.2mA sink capability when VCC1 ≥ 2.7V (VOL = 0.3V), and remains valid as long as VCC1 ≥ 1.0V or VCC2 ≥ 1.0V. This eliminates the need for an external pull-up resistor and ensures compatible interfacing with standard CMOS/TTL microprocessor reset inputs.
Can the MAX6359SVUT+T monitor three voltage rails?
No, the MAX6359SVUT+T monitors exactly two voltage rails: VCC1 and VCC2. It does not include the RSTIN input found on MAX6355/MAX6356/MAX6357 variants, which enables third-rail monitoring via an external resistive divider. The MAX6359SVUT+T is specifically designed for dual-supply systems and lacks the additional comparator and input pin required for triple-voltage supervision.
What is the supply current consumption of the MAX6359SVUT+T under typical operating conditions?
The MAX6359SVUT+T consumes 20µA typical supply current (ICC1 + ICC2) when VCC1 = 5.5V and VCC2 = 3.6V, with all I/O pins open. This ultra-low quiescent current is confirmed in the Electrical Characteristics table and makes the device suitable for battery-powered or energy-sensitive applications where standby power budget is critical.
MAX6359SVUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.19V, 2.93V
- 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
MAX6359SVUT+T FAQ
1.How can I place an order for MAX6359SVUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6359SVUT+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 MAX6359SVUT+T reliable?
The price and inventory of MAX6359SVUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6359SVUT+T is usually 5 days.
3.What payment methods are accepted for MAX6359SVUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6359SVUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6359SVUT+T?
MAX6359SVUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6359SVUT+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 MAX6359SVUT+T?
For technical support, including MAX6359SVUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6359SVUT+T requirements.
6.How does Aetrix verify that MAX6359SVUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6359SVUT+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 MAX6359SVUT+T meets industry standards.
7.What is the process for return or replacement of MAX6359SVUT+T?
All MAX6359SVUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6359SVUT+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 MAX6359SVUT+T part is unused and in its original packaging.
Return procedure for MAX6359SVUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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