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Analog Devices Inc./Maxim Integrated MAX6321HPUK50DZ+
- Part No.:
- MAX6321HPUK50DZ+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6321HPUK50DZ+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,445
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Product details
Overview
The MAX6321HPUK50DZ+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 5.0V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 1.12s minimum reset timeout, and 25.6s typical watchdog timeout. It monitors VCC supply integrity, provides manual reset input, and supports brownout detection in embedded control systems.
For engineers reviewing the MAX6321HPUK50DZ+ datasheet, MAX6321HPUK50DZ+ pinout, MAX6321HPUK50DZ+ application, or MAX6321HPUK50DZ+ equivalent, key selection criteria include its open-drain RESET output compatible with mixed-voltage systems up to 6V, guaranteed operation down to VCC = 1V, AEC-Q100 qualification, and immunity to short negative VCC transients.
Technical Context
This device belongs to the MAX6316–MAX6322 family and implements a voltage-monitoring architecture with factory-trimmed precision resistive divider for reset threshold setting. Its watchdog timer clears on any WDI edge (rising or falling) and asserts reset if un-serviced for 25.6s - the longest timeout option in the family.
The MAX6321HPUK50DZ+ features an open-drain RESET output requiring an external pullup resistor (e.g., 10kΩ), supports manual reset via MR pin with internal 52kΩ pullup, and guarantees valid reset assertion even as VCC drops to 1V - critical for low-power brownout recovery in battery-powered equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 5.0V nominal (4.875V to 5.125V over -40°C to +125°C); enables precise power-fail detection for 5V logic rails. |
| Reset Timeout | 1.12s minimum (MAX63__D_-T variant); ensures stable processor initialization after power-up or brownout recovery. |
| Watchdog Timeout | 25.6s typical (MAX63__Z-T variant); provides long-duration software execution monitoring without excessive CPU intervention. |
| Supply Current | 5µA typical at VCC = 3.6V; enables ultra-low-power operation in portable/battery-powered systems. |
| Operating Temp | -40°C to +125°C; qualified for automotive and industrial environments per AEC-Q100 Grade 1. |
| Package | SOT23-5 (U5+ package code); 2.9mm × 1.6mm footprint saves board space in compact designs. |
| VCC Range | 1.0V to 5.5V; guarantees functional reset assertion down to 1V, supporting deep brownout detection. |
Pinout & Package
SOT23-5 package (U5+ code), RoHS-compliant, lead-free, thermal resistance θJA = 255.9°C/W (multi-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output; requires external pullup to any voltage ≤6V; sinks ≥1.2mA at VCC ≥2.7V. |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 52kΩ; accepts TTL/CMOS logic levels. |
| 4 | WDI | Watchdog input; resets internal timer on rising or falling edge; disabled when left floating or three-stated. |
| 5 | VCC | Supply input; reset asserted when VCC falls below 5.0V threshold; operates down to 1.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET output | Supports level-shifting across multiple supply domains (e.g., 3.3V µP with 5V pullup) and wired-OR reset bus configurations. |
| No external components required | Integrates precision voltage reference, watchdog timer, manual reset logic, and ESD protection - eliminates discrete BOM items. |
| AEC-Q100 qualified | Validated for automotive applications including engine control units and ADAS subsystems operating at -40°C to +125°C. |
| Immunity to VCC glitches | Rejects negative transients <4µs duration and >100mV amplitude below VRST - prevents spurious resets during switching noise. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system behavior during deep brownout conditions where other supervisors fail silently. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5V main supply in programmable logic controller with multiple I/O modules and real-time Ethernet interface. IC Role / Device Role / Timing Role: Supervisory IC asserting open-drain RESET to ARM Cortex-M7 MCU and FPGA configuration logic upon undervoltage or software hang. Use Value: Prevents corrupted state machine transitions during brownout by holding reset until VCC stabilizes above 5.0V for ≥1.12s. |
Use Scenario: Embedded control unit managing door locks, lighting, and window motors in passenger vehicle cabin. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor for Infineon AURIX TC3xx MCU; interfaces via open-drain RESET to shared reset bus. Use Value: Enables AEC-Q100-compliant fault recovery with 25.6s watchdog timeout aligned to CAN bus diagnostic cycle timing. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Battery-powered ECG front-end with low-power SAR ADC and Bluetooth LE radio. IC Role / Device Role / Timing Role: Power-on reset generator and software watchdog for Nordic nRF52840 SoC; MR pin connected to tactile reset button. Use Value: Ultra-low 5µA supply current extends battery life; open-drain output allows 3.3V SoC reset with 5V display backlight rail pullup. |
Use Scenario: ANSI C12.22-compliant meter with dual-core ARM processor, metrology ASIC, and RF mesh communication. IC Role / Device Role / Timing Role: Primary supervisory circuit monitoring 3.3V digital supply; WDI driven by metrology ASIC watchdog pulse. Use Value: 1.12s reset timeout ensures reliable boot sequence after power restoration from grid outage or capacitor hold-up decay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6321HPUK46DZ+ | 4.63V reset threshold (vs. 5.0V); identical pinout, timeout, and watchdog specs. | Suitable for 4.5V nominal rails or tighter tolerance margins around 4.63V. | Select when system VCC nominal is 4.5V rather than 5.0V; same layout and firmware integration. |
| TPS3808G50DBVR | TI part with 5.0V threshold, 200ms reset timeout (not 1.12s), push/pull output (not open-drain). | Lacks open-drain flexibility and long reset timeout; requires PCB redesign for pullup removal. | Use only if shorter reset delay is acceptable and level-shifting is unnecessary; not drop-in compatible. |
Compared with MAX6321HPUK46DZ+, the 5.0V variant offers higher reset margin for 5V systems; compared with TPS3808G50DBVR, it provides open-drain compatibility and longer reset hold time essential for complex boot sequences.
Availability
MAX6321HPUK50DZ+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6321HPUK50DZ+ 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 ICs for demanding industrial, automotive, and communications applications.
The MAX6316–MAX6322 family delivers compact, low-power supervisory solutions optimized for microprocessor reset management, watchdog monitoring, and brownout protection in space-constrained embedded systems.
FAQ
What is the reset threshold voltage tolerance of the MAX6321HPUK50DZ+ over temperature?
The MAX6321HPUK50DZ+ has a factory-trimmed 5.0V nominal reset threshold with ±2.5% tolerance over the full -40°C to +125°C operating range. At +25°C, the tolerance tightens to ±1.5%, ensuring precise power-fail detection for 5V logic rails across automotive and industrial environments where the MAX6321HPUK50DZ+ is commonly deployed.
Does the MAX6321HPUK50DZ+ require an external pullup resistor on the RESET pin?
Yes, the MAX6321HPUK50DZ+ features an open-drain RESET output and requires an external pullup resistor to a supply voltage up to 6V. A 10kΩ resistor is sufficient in most applications. This design enables level-shifting and wired-OR reset bus configurations - a key differentiator of the MAX6321HPUK50DZ+ versus push/pull alternatives.
Can the watchdog function of the MAX6321HPUK50DZ+ be disabled without hardware modification?
Yes, the watchdog function of the MAX6321HPUK50DZ+ is disabled by leaving the WDI pin unconnected or driving it with a three-stated output. When floating, the internal watchdog timer is serviced automatically at intervals equal to 7/8 of the 25.6s timeout period - eliminating spurious resets while maintaining full MAX6321HPUK50DZ+ functionality for reset supervision only.
Is the MAX6321HPUK50DZ+ qualified for automotive applications?
Yes, the MAX6321HPUK50DZ+ is AEC-Q100 qualified (Grade 1, -40°C to +125°C) and specified for automotive use. Its guaranteed operation down to VCC = 1V, immunity to short VCC transients, and robust MR input make it suitable for body control modules, infotainment power management, and ADAS subsystems where the MAX6321HPUK50DZ+ ensures reliable fault recovery.
What is the minimum VCC voltage at which the MAX6321HPUK50DZ+ guarantees valid reset assertion?
The MAX6321HPUK50DZ+ guarantees valid reset assertion down to VCC = 1.0V - a critical specification for deep brownout recovery in battery-powered systems. Below this voltage, the internal circuitry may no longer drive the open-drain RESET line, but the MAX6321HPUK50DZ+ remains functional through the entire 1.0V–5.5V operating range specified in its absolute maximum ratings.
MAX6321HPUK50DZ+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 5V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6321HPUK50DZ+ FAQ
1.How can I place an order for MAX6321HPUK50DZ+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6321HPUK50DZ+ 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 MAX6321HPUK50DZ+ reliable?
The price and inventory of MAX6321HPUK50DZ+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6321HPUK50DZ+ is usually 5 days.
3.What payment methods are accepted for MAX6321HPUK50DZ+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6321HPUK50DZ+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6321HPUK50DZ+?
MAX6321HPUK50DZ+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6321HPUK50DZ+ 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 MAX6321HPUK50DZ+?
For technical support, including MAX6321HPUK50DZ+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6321HPUK50DZ+ requirements.
6.How does Aetrix verify that MAX6321HPUK50DZ+ is sourced from the original manufacturer or authorized distributors?
All MAX6321HPUK50DZ+ 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 MAX6321HPUK50DZ+ meets industry standards.
7.What is the process for return or replacement of MAX6321HPUK50DZ+?
All MAX6321HPUK50DZ+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6321HPUK50DZ+, 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 MAX6321HPUK50DZ+ part is unused and in its original packaging.
Return procedure for MAX6321HPUK50DZ+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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