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Analog Devices Inc./Maxim Integrated MAX6321HPUK30CY-T
- Part No.:
- MAX6321HPUK30CY-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6321HPUK30CY-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,637
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Product details
Overview
MAX6321HPUK30CY-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 3.0V 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 reset assertion during power-up, brownout, or software hang in embedded control systems.
For engineers reviewing the MAX6321HPUK30CY-T datasheet, MAX6321HPUK30CY-T pinout, MAX6321HPUK30CY-T application, or MAX6321HPUK30CY-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 short negative VCC transients (<4µs at 100mV under threshold), and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The MAX6321HPUK30CY-T implements a precision voltage monitor using a factory-laser-trimmed resistor divider to set the 3.0V 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.
Reset assertion occurs when VCC falls below 3.0V, when MR is pulled low (with 52kΩ internal pullup), or when WDI remains static beyond 1.6s. After recovery, RESET remains asserted for 140ms before deasserting; the open-drain output requires an external pullup to any supply ≤6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.0V nominal, ±2.5% over -40°C to +125°C - ensures reliable power-fail detection across automotive and industrial temperature ranges |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for microprocessor initialization after power stabilization |
| Watchdog Timeout | 1.6s typical - provides robust software hang detection without excessive system interruption |
| Supply Current | 5µA typical at 3.6V - enables ultra-low-power operation in battery-backed or portable applications |
| RESET Output Type | Active-low open-drain - allows level-shifting and wired-OR connection with multiple reset sources up to 6V |
| Operating Temperature | -40°C to +125°C - supports under-hood automotive, industrial control, and harsh-environment deployment |
| AEC-Q100 Qualified | Grade 1 - validated for automotive electronics per stress testing requirements (HTOL, TC, HAST, etc.) |
Pinout & Package
MAX6321HPUK30CY-T is housed in a 5-pin SOT23 package (package code U5+2A, outline 21-0057), with 0.95mm pitch, 2.9mm × 1.6mm footprint, and thermal resistance θJA = 255.9°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output - sinks current only; requires external pullup to define logic-high level (up to 6V) |
| 2 | GND | Ground reference - common return path for all internal circuitry and reset timing references |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 52kΩ; asserts reset when pulled low ≥1.5µs |
| 4 | WDI | Watchdog input - edge-sensitive; reset triggered if no transition occurs within 1.6s; disable by leaving floating |
| 5 | VCC | Supply input - powers device and serves as monitored rail; reset asserts when VCC drops below 3.0V |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET with 0.4V VOL @ 3.2mA | Enables interoperability with 1.8V–6V logic families and supports wired-OR reset bus architectures |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout conditions before full power collapse |
| Immunity to <4µs negative VCC transients | Prevents spurious resets from EMI or switching noise without requiring additional filtering components |
| No external components required | Reduces BOM count and PCB area - integrates precision threshold, timing, and reset logic in 5-pin SOT23 |
| AEC-Q100 Grade 1 qualification | Validates reliability for automotive applications including engine control, body electronics, and ADAS subsystems |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 5V or 3.3V supply rails in engine management systems where voltage dips occur during cranking or load dump. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to MCU upon VCC drop below 3.0V or software lockup detected via WDI timeout. Use Value: Prevents corrupted firmware execution during transient undervoltage events; 140ms reset hold ensures safe MCU boot sequence after recovery. |
Use Scenario: Embedded controller in modular I/O base unit requiring fail-safe restart after brownout or watchdog-triggered fault. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset override (MR) and open-drain RESET tied to shared backplane reset line. Use Value: Open-drain output allows direct connection to 24V backplane reset bus with single pullup; AEC-Q100 rating supports extended industrial lifecycle. |
| Portable Medical Diagnostic Device | Battery-Powered Smart Sensor Node |
|
Use Scenario: Power management in handheld ultrasound or glucose meter where battery voltage decays gradually during use. IC Role / Device Role / Timing Role: Reset generator monitoring main Li-ion supply (3.0–4.2V range); 3.0V threshold triggers controlled shutdown before data loss. Use Value: Ultra-low 5µA supply current extends battery life; 1.6s watchdog timeout detects firmware hangs without draining reserve capacity. |
Use Scenario: LoRaWAN or NB-IoT sensor node powered by coin cell or energy harvester with intermittent VCC availability. IC Role / Device Role / Timing Role: Supervisor ensuring clean MCU reset on wake-up from deep sleep; MR pin used for user-initiated recovery. Use Value: MR internal 52kΩ pullup eliminates external resistor; 140ms reset timeout accommodates slow-rising harvested supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6321HPUK31CY-T | 3.08V reset threshold (vs. 3.00V), same 140ms tRP and 1.6s tWD | Suitable where tighter margin above 3.0V rail is needed to avoid nuisance resets during ripple | Select when system VCC nominal is 3.3V with >100mV headroom required before reset assertion |
| TLV803EB30DBVR | 3.0V threshold, 200ms reset timeout, no watchdog or MR, SOT23-5, 0.9µA ICC | Lacks watchdog and manual reset; optimized purely for low-power voltage monitoring | Choose for cost-sensitive, static-supply applications where software supervision is handled externally |
Compared with MAX6321HPUK30CY-T, the MAX6321HPUK31CY-T offers slightly higher reset threshold for improved noise margin on 3.3V rails, while TLV803EB30DBVR trades watchdog/MR functionality for ultra-low quiescent current-making it suitable only for simple power-fail detection without system-level fault recovery.
Availability
MAX6321HPUK30CY-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, portable medical devices, and battery-powered sensor nodes requiring stable component supply with AEC-Q100 compliance and long-term manufacturability.
Supply support for MAX6321HPUK30CY-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 high-performance analog and mixed-signal ICs for automotive, industrial, communications, and computing markets, with emphasis on power efficiency, reliability, and integration.
The MAX6316–MAX6322 family delivers compact, factory-trimmed supervisory solutions targeting space-constrained embedded systems needing precise voltage monitoring, programmable reset timing, and watchdog protection - especially where AEC-Q100 qualification is mandatory.
FAQ
What is the exact reset threshold voltage for MAX6321HPUK30CY-T and how does it vary with temperature?
The MAX6321HPUK30CY-T has a nominal reset threshold of 3.00V at +25°C, with ±2.5% tolerance over -40°C to +125°C and a temperature coefficient of 40ppm/°C. This means the actual threshold stays within 2.925V to 3.075V across the full operating range, ensuring predictable brownout response in automotive and industrial environments where ambient temperature swings are extreme.
Does MAX6321HPUK30CY-T require an external pullup resistor on the RESET pin, and what value is recommended?
Yes, MAX6321HPUK30CY-T features an open-drain RESET output and requires an external pullup resistor. A 10kΩ resistor to the target logic supply (up to 6V) is recommended - it ensures valid logic-high levels while limiting sink current to ≤3.2mA at 0.4V VOL, meeting drive capability specs across all VCC conditions from 1.0V to 5.5V.
Can the watchdog function of MAX6321HPUK30CY-T be disabled, and if so, how?
Yes, the watchdog function in MAX6321HPUK30CY-T is disabled by leaving the WDI pin unconnected or three-stating the driving source. When floating, the internal watchdog timer is automatically serviced every ~1.4s (7/8 of 1.6s) by an internal pulse, preventing unintended reset assertion while retaining full supervisory functionality for VCC and MR inputs.
What is the minimum pulse width required on the MR pin of MAX6321HPUK30CY-T to trigger a reset?
The MR pin of MAX6321HPUK30CY-T requires a minimum low pulse width of 1.5µs at temperatures from -40°C to +125°C to reliably assert reset. This specification accounts for worst-case timing across voltage and temperature extremes, and the internal 52kΩ pullup ensures MR remains high when unused - eliminating need for external biasing components.
Is MAX6321HPUK30CY-T qualified for automotive applications, and what does that qualification cover?
Yes, MAX6321HPUK30CY-T is AEC-Q100 Grade 1 qualified, meaning it has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), highly accelerated stress test (HAST), and electrostatic discharge (ESD) per automotive reliability standards. This validates its suitability for under-hood and cabin electronics where long-term stability and failure-free operation are critical.
MAX6321HPUK30CY-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:
- 3V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6321HPUK30CY-T FAQ
1.How can I place an order for MAX6321HPUK30CY-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6321HPUK30CY-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 MAX6321HPUK30CY-T reliable?
The price and inventory of MAX6321HPUK30CY-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6321HPUK30CY-T is usually 5 days.
3.What payment methods are accepted for MAX6321HPUK30CY-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6321HPUK30CY-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6321HPUK30CY-T?
MAX6321HPUK30CY-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6321HPUK30CY-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 MAX6321HPUK30CY-T?
For technical support, including MAX6321HPUK30CY-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6321HPUK30CY-T requirements.
6.How does Aetrix verify that MAX6321HPUK30CY-T is sourced from the original manufacturer or authorized distributors?
All MAX6321HPUK30CY-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 MAX6321HPUK30CY-T meets industry standards.
7.What is the process for return or replacement of MAX6321HPUK30CY-T?
All MAX6321HPUK30CY-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6321HPUK30CY-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 MAX6321HPUK30CY-T part is unused and in its original packaging.
Return procedure for MAX6321HPUK30CY-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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