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Analog Devices Inc./Maxim Integrated MAX6321HPUK31AY-T
- Part No.:
- MAX6321HPUK31AY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6321HPUK31AY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,371
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Product details
Overview
MAX6321HPUK31AY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 3.08V factory-trimmed reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity and provides system-level reset assertion during power-up, brownout, or software hang conditions in battery-powered embedded controllers.
For engineers reviewing the MAX6321HPUK31AY-T datasheet, MAX6321HPUK31AY-T pinout, MAX6321HPUK31AY-T application, or MAX6321HPUK31AY-T equivalent, key selection criteria include its open-drain RESET output compatible with mixed-voltage systems up to 6V, guaranteed reset validity down to VCC = 1V, immunity to sub-4µs negative VCC transients, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6321HPUK31AY-T implements a precision voltage monitor using a factory-laser-trimmed resistor divider to set its 3.08V reset threshold, with ±2.5% tolerance across -40°C to +125°C and 40ppm/°C temperature coefficient. Its internal watchdog timer clears on any WDI edge and times out after 1.6s if unserviced, triggering reset assertion.
Reset remains active for 140ms after VCC rises above threshold or MR release, with propagation delay under 40µs during VCC fall. The open-drain RESET output sinks ≥1.2mA at VCC ≥2.7V with VOL ≤0.3V and exhibits <1µA leakage when deasserted - enabling flexible pullup to any rail ≤6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.5% (–40°C to +125°C); ensures reliable detection of 3.3V supply brownout before system instability. |
| Reset Timeout Period | 140ms minimum; guarantees sufficient hold time for microcontroller initialization after power recovery. |
| Watchdog Timeout | 1.6s typical; provides robust software execution monitoring without excessive false triggers. |
| Supply Current | 5µA typical at VCC = 3.6V; enables ultra-low-power operation in portable/battery-powered systems. |
| Operating Temperature | –40°C to +125°C; supports deployment in automotive engine compartments and industrial control enclosures. |
| RESET Output Type | Active-low open-drain; allows shared reset bus with multiple voltage domains via external pullup to 1.8V, 3.3V, or 5V. |
| AEC-Q100 Qualification | Qualified per Grade 1 (–40°C to +125°C); meets automotive electronics reliability and stress-test requirements. |
Pinout & Package
MAX6321HPUK31AY-T is housed in a RoHS-compliant 5-pin SOT23 package (package code U5+2A, outline 21-0057), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. This miniature footprint supports high-density PCB layouts in space-constrained portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output; requires external pullup resistor (e.g., 10kΩ) to target supply rail (≤6V); sinks ≥1.2mA at VCC ≥2.7V. |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must be low-impedance connection to system ground plane. |
| 3 | WDI | Watchdog input; reset triggered if no rising/falling edge occurs within 1.6s; disable by leaving unconnected or three-stating. |
| 4 | MR | Manual reset input; active-low; internally pulled up to VCC via 52kΩ; asserts reset when pulled below 0.3×VCC (for VTH < 4.0V). |
| 5 | VCC | Supply input; monitors voltage for reset generation; operates from 1.0V to 5.5V; reset asserted when VCC < 3.08V. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, watchdog timer, and reset generator eliminate need for discrete R/C networks or comparators. |
| Open-drain RESET with 6V tolerance | Enables level-shifting across mixed-supply systems (e.g., 3.3V supervisor driving 5V µP reset line) using single external pullup. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout or controlled power-down sequences without external support circuitry. |
| Immunity to short VCC transients | Rejects negative glitches <4µs duration even when amplitude dips 100mV below 3.08V threshold - prevents spurious resets in noisy environments. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood applications with extended temperature range and accelerated life testing per JEDEC standards. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply in door module ECUs subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Voltage supervisor and watchdog timer ensuring safe MCU restart after power anomaly or firmware lockup. Use Value: Prevents undefined MCU state during battery voltage sag; open-drain RESET interfaces directly to 5V CAN transceiver reset pin. |
Use Scenario: Supervises ARM Cortex-M4 core in modular I/O controller operating in factory-floor ambient (–25°C to +70°C). IC Role / Device Role / Timing Role: Primary reset source coordinating power-on sequencing and runtime fault recovery across FPGA and analog front-end. Use Value: 140ms reset timeout aligns with FPGA configuration time; 1.6s watchdog interval avoids false triggers during deterministic interrupt latency. |
| Portable Medical Infusion Pump | Battery-Powered Smart Sensor Node |
|
Use Scenario: Ensures fail-safe shutdown and restart of safety-critical dosing controller powered by Li-ion battery (2.8V–4.2V range). IC Role / Device Role / Timing Role: Brownout detector and software watchdog enforcing AS60601-1 compliance for medical device reset integrity. Use Value: 3.08V threshold precisely targets end-of-discharge detection; 5µA quiescent current extends battery life between calibrations. |
Use Scenario: Manages reset integrity for LoRaWAN node with intermittent solar charging and variable VCC (2.5V–3.6V). IC Role / Device Role / Timing Role: Low-power supervisory circuit asserting reset during undervoltage and verifying firmware liveness via WDI polling. Use Value: Open-drain output allows shared reset net with 1.8V sensor ICs; AEC-Q100 qualification assures long-term reliability in outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6321HPUK31AZ-T | Lead-free (RoHS-compliant) variant with identical electrical specs and SOT23-5 package; top mark ACDS instead of ACDA. | Same functional use; selected when lead-free assembly process or environmental compliance is mandatory. | Drop-in replacement for MAX6321HPUK31AY-T where Pb-free soldering is required; no layout or firmware changes needed. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (±0.5%), 200ms reset timeout, push/pull active-low output; 1.8µA IQ at 3.3V; no watchdog function. | Lacks watchdog capability; suited for simpler power-monitor-only applications without software hang detection. | Choose when only precise 3.3V brownout protection is needed and watchdog functionality is handled elsewhere in firmware or hardware. |
Compared with MAX6321HPUK31AY-T, the MAX6321HPUK31AZ-T offers identical performance in a lead-free package, while the TPS3808G33DBVR trades watchdog capability for tighter reset threshold accuracy and lower quiescent current - making it suitable for cost-sensitive, non-safety-critical power monitoring.
Availability
MAX6321HPUK31AY-T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC subsystems, portable medical infusion pumps, and battery-powered smart sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6321HPUK31AY-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 and mixed-signal ICs for demanding industrial, automotive, and communications applications, emphasizing reliability, integration, and low-power operation.
The MAX6316–MAX6322 family delivers highly configurable µP supervisory circuits with factory-trimmed thresholds, programmable timeouts, and multiple reset output types - engineered specifically for robust power monitoring and fault recovery in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6321HPUK31AY-T and how does it vary with temperature?
The MAX6321HPUK31AY-T features a factory-trimmed nominal reset threshold of 3.08V, with tolerance of ±2.5% over the full operating range of –40°C to +125°C. Its temperature coefficient is specified at 40ppm/°C, meaning drift is limited to approximately ±12mV across a 100°C span. This precision enables reliable detection of 3.3V supply brownout without external calibration.
Does MAX6321HPUK31AY-T include a watchdog timer, and what is its timeout period?
Yes, MAX6321HPUK31AY-T includes a watchdog timer with a typical timeout period of 1.6 seconds. The timer resets on any rising or falling edge at the WDI pin and asserts RESET if unserviced for the full timeout duration. This feature helps detect and recover from software hangs in embedded microcontrollers, complementing its primary power-supply monitoring function.
What type of reset output does MAX6321HPUK31AY-T provide, and what are its drive capabilities?
MAX6321HPUK31AY-T provides an active-low open-drain RESET output. It sinks ≥1.2mA when VCC ≥2.7V with VOL ≤0.3V, and exhibits <1.0µA leakage when deasserted. This architecture allows flexible interfacing with multiple voltage domains (up to 6V) using a single external pullup resistor, unlike push/pull variants that require matching supply rails.
Can MAX6321HPUK31AY-T operate reliably during severe supply transients?
Yes, MAX6321HPUK31AY-T is specifically designed to reject short-duration negative VCC transients: it remains immune to glitches as brief as 4µs even when amplitude dips 100mV below its 3.08V threshold. This robustness prevents spurious resets in electrically noisy environments such as automotive or industrial settings, eliminating the need for additional filtering components.
Is MAX6321HPUK31AY-T qualified for automotive applications?
Yes, MAX6321HPUK31AY-T is AEC-Q100 qualified (Grade 1), certified for operation from –40°C to +125°C and validated against automotive reliability stress tests including HTOL, TC, and ESD. Its qualification confirms suitability for under-hood and cabin applications such as body control modules, ADAS sensors, and infotainment power management where long-term stability is critical.
MAX6321HPUK31AY-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6321HPUK31AY-T FAQ
1.How can I place an order for MAX6321HPUK31AY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6321HPUK31AY-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 MAX6321HPUK31AY-T reliable?
The price and inventory of MAX6321HPUK31AY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6321HPUK31AY-T is usually 5 days.
3.What payment methods are accepted for MAX6321HPUK31AY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6321HPUK31AY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6321HPUK31AY-T?
MAX6321HPUK31AY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6321HPUK31AY-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 MAX6321HPUK31AY-T?
For technical support, including MAX6321HPUK31AY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6321HPUK31AY-T requirements.
6.How does Aetrix verify that MAX6321HPUK31AY-T is sourced from the original manufacturer or authorized distributors?
All MAX6321HPUK31AY-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 MAX6321HPUK31AY-T meets industry standards.
7.What is the process for return or replacement of MAX6321HPUK31AY-T?
All MAX6321HPUK31AY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6321HPUK31AY-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 MAX6321HPUK31AY-T part is unused and in its original packaging.
Return procedure for MAX6321HPUK31AY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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