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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 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:549
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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, 4.63V/2.93V precision factory-set thresholds, 20µA supply current, and integrated watchdog timer (46.4s startup / 2.9s normal timeout). It ensures reliable power-on reset and fault detection in multivoltage embedded systems such as industrial controllers and portable instrumentation.
For engineers reviewing the MAX6359LSUT datasheet, MAX6359LSUT pinout, MAX6359LSUT application, or MAX6359LSUT equivalent, key selection criteria include dual-supply monitoring capability, guaranteed RESET validity down to VCC1 = 1V or VCC2 = 1V, debounced manual-reset input, and watchdog timer timing parameters critical for boot integrity and runtime supervision.
Technical Context
The MAX6359LSUT implements independent voltage comparators for VCC1 and VCC2, asserting reset when either supply drops below its respective threshold (4.63V and 2.93V). Its reset generator guarantees a minimum 100ms pulse width and remains functional as long as at least one supply exceeds +1.0V.
It integrates a dual-mode watchdog timer with a 46.4s startup timeout (for system initialization) and 2.9s normal timeout (for runtime supervision), cleared by rising or falling edges on the WDI pin. The device uses BiCMOS process technology and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.63V ±0.09V at +25°C; ensures precise reset assertion for primary 4.63V supply rail |
| VCC2 Threshold | 2.93V ±0.05V at +25°C; enables accurate monitoring of secondary 2.93V logic or I/O supply |
| Supply Current | 20µA typical; supports ultra-low-power operation in battery-backed or energy-constrained systems |
| Reset Pulse Width | 100–280ms; guarantees sufficient duration to fully reset microprocessors and peripheral logic |
| Watchdog Startup Timeout | 46.4s; provides extended window for complex firmware boot sequences before watchdog enforcement begins |
| Watchdog Normal Timeout | 2.9s; delivers rapid fault response during steady-state operation to prevent hung processor states |
| Operating Temperature | –40°C to +85°C; validated for industrial and extended-temperature embedded deployments |
Pinout & Package
MAX6359LSUT is housed in a 6-pin SOT23 package (U6-1 outline, 21-0058), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and exposed pad optional per Maxim land pattern 90-0175.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output referenced to VCC1; drives low without external pull-up; asserts when VCC1 < 4.63V or VCC2 < 2.93V |
| 2 | GND | Ground reference for all internal circuitry and reset output sink path |
| 3 | MR | Debounced manual-reset input; active-low; forces RST low while asserted and for full timeout period after release |
| 4 | VCC2 | Secondary supply input; powers device when > VCC1 and monitored at 2.93V threshold |
| 5 | WDI | Watchdog input; requires edge transitions every ≤2.9s in normal mode; initiates reset if static for timeout duration |
| 6 | VCC1 | Primary supply input; powers device when > VCC2 and monitored at 4.63V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously tracks VCC1 and VCC2 with separate precision thresholds-no external components needed for two-rail supervision |
| Guaranteed RESET validity to 1V | Ensures correct reset state even as either VCC1 or VCC2 decays to 1.0V, supporting brown-out recovery and safe shutdown |
| BiCMOS process architecture | Delivers low 20µA quiescent current and high noise immunity against power-supply transients up to 100ns |
| Debounced TTL/CMOS MR input | Rejects sub-100ns glitches and eliminates need for external RC filtering on manual-reset lines |
| Startup + normal watchdog modes | Enables robust boot sequencing (46.4s) followed by responsive runtime supervision (2.9s), reducing false resets |
Applications
| Industrial Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: PLC and motion controller modules requiring coordinated reset of 5V CPU core and 3.3V I/O rails during cold start or brown-out. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting single RST signal when either rail fails, with 100ms+ pulse width ensuring full FPGA and MCU initialization. Use Value: Eliminates discrete resistor-divider monitoring circuits and prevents spurious resets during transient dips common in industrial power environments. |
Use Scenario: Battery-powered glucose meters and handheld diagnostics where low-power operation and reliable boot are mandatory. IC Role / Device Role / Timing Role: Monitors main 4.63V battery rail and 2.93V analog sensor supply; watchdog enforces firmware liveness after boot completes. Use Value: 20µA supply current extends battery life; 46.4s startup timeout accommodates slow warm-up of precision ADC references and sensors. |
| Multivoltage Embedded Systems | Intelligent Power Management Units |
Use Scenario: Edge gateway devices integrating ARM SoC (1.2V core), DDR3 (1.5V), and USB PHY (3.3V), requiring hierarchical reset coordination. IC Role / Device Role / Timing Role: Supervises highest-priority rails (e.g., 4.63V PMIC input and 2.93V LDO output); RST output triggers system-level reset sequencer. Use Value: Push-pull RST eliminates external pull-up resistors, saving board space and reducing BOM count in dense PCB layouts. |
Use Scenario: Smart power distribution boards that monitor input DC bus and auxiliary control rail while detecting processor hang via watchdog. IC Role / Device Role / Timing Role: Acts as both voltage supervisor and watchdog co-processor-asserting reset on undervoltage or missing WDI toggles. Use Value: Dual-mode watchdog prevents lockup during firmware updates or communication stalls without requiring host CPU 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 |
|---|---|---|---|
| MAX6359LTUT | VCC1 threshold = 4.38V (vs. 4.63V); same VCC2 = 2.93V, identical pinout and watchdog timing | Suitable for systems using 4.38V regulated input instead of 4.63V; no layout change required | Select when primary supply nominal is 4.38V and tighter VTH1 tolerance is needed |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitoring or WDI; 350ms reset timeout; SOT23-6 pin-compatible but functionally reduced | Lacks dual-rail monitoring and watchdog; appropriate only for simpler 3.3V-only systems | Choose only if dual-voltage supervision and watchdog are not required-reduces cost but sacrifices functionality |
Compared with MAX6359LSUT, MAX6359LTUT offers matching dual-supply supervision and watchdog capability at a lower VCC1 threshold, while TPS3808G33DBVR provides basic 3.3V reset only-making it unsuitable for multivoltage or watchdog-critical designs.
Availability
MAX6359LSUT is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, multivoltage embedded systems, and intelligent power management units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
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, automotive, and communications applications, emphasizing reliability, low power, and integration.
The MAX6351–MAX6360 family was engineered specifically for multivoltage microprocessor supervision-delivering dual/three-rail monitoring, programmable reset timing, and integrated watchdog functionality in minimal SOT23 footprints.
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 at +25°C) and VCC2 threshold of 2.93V (±0.05V at +25°C), as defined by the "LS" suffix in the Voltage Threshold Levels table. These values are precision-trimmed and guaranteed over –40°C to +85°C, with tempco of 20ppm/°C.
Does the MAX6359LSUT provide an open-drain or push-pull reset output?
The MAX6359LSUT features an active-low push-pull reset output (RST pin) referenced to VCC1. This eliminates the need for an external pull-up resistor and ensures fast, rail-to-rail drive strength-unlike open-drain variants such as MAX6352 or MAX6355.
How does the watchdog timer operate on the MAX6359LSUT?
The MAX6359LSUT watchdog timer operates in two phases: a 46.4s startup timeout after power-up or reset, followed by a 2.9s normal timeout. It resets the system if the WDI pin remains static beyond the applicable timeout-cleared only by rising or falling edges on WDI.
Can the MAX6359LSUT remain functional if one supply drops below 1.0V?
Yes-the MAX6359LSUT guarantees valid RST output as long as either VCC1 ≥ 1.0V or VCC2 ≥ 1.0V (per Absolute Maximum Ratings and Electrical Characteristics). Below 1.0V on both rails, reset behavior is not guaranteed, aligning with safe brown-out detection design practice.
What package type and footprint does the MAX6359LSUT use?
The MAX6359LSUT is supplied in a 6-pin SOT23 package (U6-1 outline, Maxim package code U6-1, land pattern 90-0175), measuring 2.9mm × 1.6mm with 0.95mm lead pitch. It is compatible with standard SOT23 reflow profiles and supports both leaded and lead(Pb)-free assembly.
MAX6359LSUT 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
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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