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Analog Devices Inc./Maxim Integrated MAX6359LSUT+
- Part No.:
- MAX6359LSUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6359LSUT+.pdf
- Description:
- IC SUPERVISOR MPU SOT23-6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6359LSUT+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset referenced to VCC1, factory-set VCC1 threshold of 4.63V and VCC2 threshold of 2.93V, watchdog timer (46.4s startup / 2.9s normal timeout), and guaranteed operation down to VCC1 ≥ 1.0V or VCC2 ≥ 1.0V - used in multivoltage embedded systems requiring reliable power-on and fault-reset sequencing.
For engineers reviewing the MAX6359LSUT+ datasheet, MAX6359LSUT+ pinout, MAX6359LSUT+ application, or MAX6359LSUT+ equivalent, this page delivers verified voltage thresholds, watchdog timing behavior, reset output drive capability, temperature range compliance, and real-world interface constraints for system-level integration.
Technical Context
The MAX6359LSUT+ implements a dual-supply monitoring architecture where independent comparators monitor VCC1 and VCC2 against precision factory-trimmed thresholds (4.63V and 2.93V respectively); reset assertion occurs if either supply falls below its trip point. Its internal watchdog timer features two distinct timeout modes: a 46.4s startup window for boot initialization and a 2.9s normal mode for runtime supervision.
Reset output is an active-low push-pull stage referenced to VCC1, capable of sinking 1.2mA at VCC1 ≥ 2.7V (VOL ≤ 0.3V) and sourcing 800µA at VCC1 > VTH1(MAX) (VOH ≥ VCC1 − 1.5V). The device guarantees valid RESET state as long as either VCC1 or VCC2 remains ≥ 1.0V, enabling robust brownout detection across asymmetric supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±0.09V (min/max over -40°C to +85°C); ensures reliable reset assertion when primary supply drops below nominal 5V rail. |
| VCC2 Threshold | 2.93V ±0.08V (min/max over -40°C to +85°C); enables precise monitoring of secondary 3.3V or 2.8V logic supply. |
| Watchdog Timeout | 46.4s startup / 2.9s normal; accommodates extended firmware boot sequences before enforcing strict runtime supervision. |
| Supply Current | 20µA typical (VCC1=5.5V, VCC2=3.6V); supports ultra-low-power battery-backed or always-on monitoring applications. |
| Reset Pulse Width | 100ms minimum; meets JEDEC JESD8-12B requirement for processor reset deassertion hold time. |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded control and instrumentation environments. |
| Package | 6-pin SOT23; surface-mount footprint compatible with high-density PCB layouts and automated assembly. |
Pinout & Package
MAX6359LSUT+ is housed in a 6-pin SOT23 package (package code U6-1, outline 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm body, and exposed pad not present. Pin 1 is RST (active-low push-pull reset referenced to VCC1), Pin 2 is GND, Pin 3 is MR (debounced manual-reset input), Pin 4 is VCC2, Pin 5 is WDI (watchdog input), and Pin 6 is VCC1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Referenced to VCC1; drives low during reset; no external pullup required; sinks 1.2mA min at VCC1 ≥ 2.7V. |
| 2 - GND | Ground reference | Common return path for all internal circuitry; must be connected directly to system ground plane. |
| 3 - MR | Debounced manual-reset input | Active-low; internally pulled up (~63.5kΩ); requires <0.8V to assert reset; glitch rejection ≥100ns. |
| 4 - VCC2 | Secondary supply input & monitor | Powers device when VCC2 > VCC1; monitored at 2.93V threshold; valid down to 1.0V for reset integrity. |
| 5 - WDI | Watchdog timer input | Edge-sensitive; clears timer on rising/falling edge; timeout triggered if no transition within 2.9s (normal mode). |
| 6 - VCC1 | Primary supply input & monitor | Powers device when VCC1 > VCC2; monitored at 4.63V threshold; supplies RST output stage and internal logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous precision tracking of VCC1 (4.63V) and VCC2 (2.93V) with ±0.09V/±0.08V tolerance over full temperature range. |
| Watchdog with dual-mode timeout | 46.4s startup period allows full system boot before enabling 2.9s runtime supervision - eliminates false resets during initialization. |
| Reset validity down to 1.0V supply | Guaranteed RST output state remains valid even if VCC1 or VCC2 drops to 1.0V - critical for brownout recovery in multirail systems. |
| Low quiescent current | 20µA typical supply current enables use in always-on monitoring without compromising battery life in portable equipment. |
| No external components required | Factory-trimmed thresholds and integrated debouncing eliminate need for external resistors, capacitors, or RC networks. |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
|
Use Scenario: Programmable logic controllers require deterministic reset sequencing across 5V I/O, 3.3V MCU, and 2.5V sensor interfaces during cold start and brownout events. IC Role / Device Role / Timing Role: MAX6359LSUT+ monitors VCC1 (5V) and VCC2 (3.3V) independently, asserts RST within 20µs of threshold breach, and maintains valid reset until both supplies stabilize above 1.0V. Use Value: Eliminates need for discrete supervisor ICs per rail; reduces BOM count by 2× while guaranteeing synchronized reset release across heterogeneous voltage domains. |
Use Scenario: Portable ultrasound or glucose meters operate from single-cell Li-ion (3.0–4.2V) with buck-boost conversion to 3.3V and 1.8V rails, requiring fail-safe reset under partial discharge. IC Role / Device Role / Timing Role: MAX6359LSUT+ uses VCC1 = 3.3V rail (4.63V threshold unused) and VCC2 = 1.8V rail (2.93V threshold adapted via external divider per datasheet Figure 2). Use Value: Enables accurate low-voltage monitoring without adding external comparators; 20µA supply current extends battery runtime beyond 12 months in standby mode. |
| Automotive Body Control Modules | Network Edge Routers |
|
Use Scenario: BCMs integrate 5V CAN transceivers, 3.3V microcontrollers, and 1.2V FPGA configuration logic - all requiring coordinated reset during ignition cycling and load-dump transients. IC Role / Device Role / Timing Role: MAX6359LSUT+ detects VCC1 (5V) sag below 4.63V and VCC2 (3.3V) sag below 2.93V; RST output holds MCU in reset until both rails recover and watchdog confirms firmware execution. Use Value: Prevents MCU lockup during automotive battery voltage dips (e.g., cranking at 6.5V → 5.2V); 100ms min pulse width satisfies ISO 16750-2 cold-cranking reset hold requirements. |
Use Scenario: Carrier-grade routers deploy dual-core processors with separate 1.1V core, 1.8V I/O, and 3.3V PHY supplies - requiring simultaneous reset assertion and post-boot watchdog supervision. IC Role / Device Role / Timing Role: MAX6359LSUT+ monitors 3.3V PHY rail (VCC1) and 1.8V I/O rail (VCC2); WDI input receives periodic toggles from processor GPIO to prevent spurious resets during firmware updates. Use Value: 46.4s startup timeout accommodates full FPGA reconfiguration and Linux kernel boot; 2.9s normal timeout detects stalled application threads without false positives from interrupt latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6359LTUT+ | VCC1 threshold = 4.38V (vs. 4.63V); same VCC2 = 2.93V, identical watchdog timing and pinout. | Suitable for systems with tighter 5V rail tolerance (e.g., LDO-regulated 4.5–4.7V supplies) where 4.63V threshold risks premature reset. | Select MAX6359LTUT+ when nominal VCC1 is 4.5V instead of 5V; otherwise retain MAX6359LSUT+ for standard 5V systems. |
| TPS3808G33DBVR | Single-supply monitor (3.3V only); no VCC2 input or dual-rail capability; 200ms reset timeout; no watchdog timer. | Limited to single-rail applications; cannot replace MAX6359LSUT+ in dual-supply systems without adding second supervisor IC. | Use only as partial substitute where only 3.3V monitoring is needed and watchdog functionality is handled externally. |
Compared with MAX6359LTUT+, MAX6359LSUT+ provides higher VCC1 trip point for robustness against 5V rail noise; compared with TPS3808G33DBVR, it delivers true dual-rail supervision and integrated watchdog - eliminating design compromises in multivoltage systems.
Availability
MAX6359LSUT+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, network edge routers, and multivoltage embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6359LSUT+ 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, communications, computing, and consumer applications - emphasizing reliability, low power, and integration.
The MAX6351–MAX6360 family targets multivoltage microprocessor supervision, delivering factory-trimmed dual-threshold monitoring, watchdog timers, and reset integrity down to 1.0V - specifically engineered for embedded systems with heterogeneous power domains.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6359LSUT+?
The MAX6359LSUT+ has a factory-set VCC1 threshold of 4.63V (±0.09V over -40°C to +85°C) and VCC2 threshold of 2.93V (±0.08V over temperature). These values are confirmed in the Voltage-Threshold Levels table and Electrical Characteristics section of the MAX6359LSUT+ datasheet - no external resistor adjustment is required.
Does the MAX6359LSUT+ provide watchdog functionality, and what are its timeout periods?
Yes, the MAX6359LSUT+ includes a dual-mode watchdog timer: a 46.4s startup timeout (for system boot initialization) and a 2.9s normal timeout (for runtime supervision). These values are guaranteed across temperature and supply voltage, and are explicitly specified in the Electrical Characteristics table under "Watchdog Timeout Period".
What is the output type and drive capability of the RST pin on the MAX6359LSUT+?
The RST pin on the MAX6359LSUT+ is an active-low push-pull output referenced to VCC1. It sinks ≥1.2mA at VCC1 ≥ 2.7V (VOL ≤ 0.3V) and sources ≥800µA at VCC1 > VTH1(MAX) (VOH ≥ VCC1 − 1.5V). This eliminates need for external pull-up resistors in most microprocessor interface configurations.
Can the MAX6359LSUT+ operate reliably when one supply drops below 2.0V?
Yes - the MAX6359LSUT+ guarantees valid RST output as long as either VCC1 or VCC2 remains ≥ 1.0V. This is explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections, enabling robust brownout response in asymmetric multivoltage systems where one rail may collapse while another sustains minimal operation.
Is the MAX6359LSUT+ pin-compatible with other devices in the MAX6351–MAX6360 family?
Yes - the MAX6359LSUT+ uses the standard 6-pin SOT23 package (U6-1) and shares identical pinout with MAX6351, MAX6355–MAX6358, and MAX6360. Pin 1 = RST, Pin 2 = GND, Pin 3 = MR, Pin 4 = VCC2, Pin 5 = WDI, Pin 6 = VCC1 - confirmed in the Pin Configurations section of the MAX6359LSUT+ datasheet.
MAX6359LSUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- 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-6
MAX6359LSUT+ FAQ
1.How can I place an order for MAX6359LSUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6359LSUT+ 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 MAX6359LSUT+ reliable?
The price and inventory of MAX6359LSUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6359LSUT+ is usually 5 days.
3.What payment methods are accepted for MAX6359LSUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6359LSUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6359LSUT+?
MAX6359LSUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6359LSUT+ 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 MAX6359LSUT+?
For technical support, including MAX6359LSUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6359LSUT+ requirements.
6.How does Aetrix verify that MAX6359LSUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6359LSUT+ 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 MAX6359LSUT+ meets industry standards.
7.What is the process for return or replacement of MAX6359LSUT+?
All MAX6359LSUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6359LSUT+, 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 MAX6359LSUT+ part is unused and in its original packaging.
Return procedure for MAX6359LSUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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