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Analog Devices Inc./Maxim Integrated MAX6321HPUK26CY+T
- Part No.:
- MAX6321HPUK26CY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6321HPUK26CY+T.pdf
- Description:
- IC SUPERVISOR 2.63V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6321HPUK26CY+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 2.63V 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 lockup in embedded controllers.
For engineers reviewing the MAX6321HPUK26CY+T datasheet, MAX6321HPUK26CY+T pinout, MAX6321HPUK26CY+T application, or MAX6321HPUK26CY+T equivalent, key selection criteria include its open-drain RESET output compatible with multi-supply systems, guaranteed reset validity down to VCC = 1V, AEC-Q100 qualification, and factory-trimmed 2.63V threshold for 3.3V rail supervision.
Technical Context
The MAX6321HPUK26CY+T implements a precision voltage monitor using a laser-trimmed resistor divider to set the 2.63V 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 2.63V, when MR is pulled low (active-low manual reset input with 52kΩ internal pullup), or when WDI remains static beyond 1.6s. After recovery, RESET remains asserted for 140ms before deasserting, ensuring reliable μP initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal (factory-trimmed), ±2.5% over -40°C to +125°C - ensures accurate 3.3V rail supervision with margin against dropout. |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for microprocessor reset sequencing after power stabilization. |
| Watchdog Timeout | 1.6s typical - provides robust software execution monitoring without excessive false triggers in real-time control loops. |
| Supply Current | 5µA typical at VCC = 3.6V - enables ultra-low-power operation in battery-backed or energy-constrained systems. |
| Operating Temperature | -40°C to +125°C - supports industrial and automotive under-hood applications requiring extended thermal range. |
| Reset Output Type | Active-low open-drain - allows connection to multiple supply domains (up to 6V) via external pullup, enabling mixed-voltage system reset coordination. |
| AEC-Q100 Qualified | Yes - certified for automotive applications including engine control units and ADAS domain controllers. |
Pinout & Package
MAX6321HPUK26CY+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, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output - requires external pullup resistor (e.g., 10kΩ) to target supply (≤6V); sinks current only during reset assertion. |
| 2 | GND | Ground reference - must be connected directly to system ground plane for stable voltage monitoring and noise immunity. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 52kΩ resistor; accepts TTL/CMOS logic levels; rejects ≤100ns glitches. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); resets internal timer on transition; disable by leaving unconnected or three-stating. |
| 5 | VCC | Supply input - monitors voltage from 1.0V to 5.5V; reset asserts when VCC drops below 2.63V; absolute max = +6V. |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET output | Supports level-shifting across multiple supply domains (e.g., 3.3V μP with 5V I/O rail) using a single external pullup resistor. |
| Factory-trimmed 2.63V threshold | Eliminates external resistor network; achieves ±2.5% accuracy over full temperature range without calibration. |
| 140ms reset timeout | Ensures μP reset signal meets minimum assertion time requirements for ARM Cortex-M and RISC-V boot sequences. |
| 1.6s watchdog timeout | Matches typical firmware main-loop execution intervals in industrial PLCs and motor control firmware. |
| AEC-Q100 qualification | Validated for automotive Grade 2 (-40°C to +105°C case) and Grade 3 (-40°C to +125°C case) environments. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
|
Use Scenario: Supervises 3.3V microcontroller supply in programmable logic controller operating in factory-floor environments with wide ambient temperature swings and EMI exposure. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor - asserts open-drain RESET to halt CPU execution during undervoltage or software hang. Use Value: Prevents corrupted I/O state during brownout; 140ms timeout aligns with IEC 61131-2 reset timing requirements for safety-critical control logic. |
Use Scenario: Monitors power to 32-bit MCU in body control unit managing door locks, lighting, and window motors in passenger vehicles. IC Role / Device Role / Timing Role: AEC-Q100-qualified supervisory IC - provides fail-safe reset initiation and software lockup detection per ISO 26262 ASIL-B requirements. Use Value: 2.63V threshold matches 3.3V rail tolerance; open-drain output interfaces cleanly with 5V CAN transceiver reset lines without level shifters. |
| Portable Medical Monitor | Smart Energy Meter |
|
Use Scenario: Ensures reliable boot of ARM-based data acquisition subsystem in battery-powered patient vital sign monitor with intermittent charging cycles. IC Role / Device Role / Timing Role: Low-power supply supervisor - draws only 5µA at 3.6V while providing valid reset down to VCC = 1V for graceful shutdown. Use Value: Enables deterministic restart after battery recovery; 1.6s watchdog interval prevents missed arrhythmia detection due to firmware stalls. |
Use Scenario: Supervises metrology SoC and communication MCU in ANSI C12.22-compliant smart meter deployed in outdoor utility cabinets. IC Role / Device Role / Timing Role: Dual-function supervisor - combines precise 2.63V threshold monitoring with manual reset via tamper-detection switch and watchdog for firmware integrity. Use Value: MR input supports physical tamper-reset integration; open-drain RESET allows shared reset bus with RF module and secure element ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6321HPUK29CY+T | 2.93V reset threshold (vs. 2.63V); identical 140ms timeout and 1.6s watchdog. | Targeted at 3.3V systems with tighter tolerance margins or higher noise immunity requirements. | Select when supervising 3.3V rails with >100mV headroom above nominal; same footprint and pinout. |
| TPS3808G18DBVR | 1.8V reset threshold; 200ms timeout; no watchdog; push/pull output (not open-drain). | Lacks watchdog functionality and multi-supply compatibility; requires redesign for pullup topology. | Choose only for cost-sensitive non-automotive designs where watchdog is unnecessary and 1.8V threshold suffices. |
Compared with MAX6321HPUK26CY+T, the MAX6321HPUK29CY+T offers identical architecture with higher reset threshold for enhanced noise margin, while the TPS3808G18DBVR sacrifices watchdog capability and open-drain flexibility for lower unit cost in simpler applications.
Availability
MAX6321HPUK26CY+T 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 with AEC-Q100 compliance and long-term lifecycle support.
Supply support for MAX6321HPUK26CY+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 industrial, automotive, and communications markets, emphasizing reliability, low power, and high integration.
The MAX6316–MAX6322 family delivers highly configurable μP supervisory circuits optimized for harsh-environment embedded systems requiring guaranteed reset behavior, watchdog protection, and multi-rail compatibility.
FAQ
What is the exact reset threshold voltage of MAX6321HPUK26CY+T and how stable is it over temperature?
The MAX6321HPUK26CY+T features a factory-trimmed reset threshold of 2.63V, with ±2.5% tolerance over the full operating range of -40°C to +125°C and a temperature coefficient of 40ppm/°C. This ensures consistent 3.3V rail supervision without drift-induced false resets in thermal cycling environments such as automotive under-hood or industrial enclosures.
Does MAX6321HPUK26CY+T support manual reset, and how is the MR pin configured?
Yes, MAX6321HPUK26CY+T includes an active-low manual reset (MR) input with an internal 52kΩ pullup resistor to VCC. The MR pin accepts TTL/CMOS logic levels, rejects transients ≤100ns, and asserts reset for the full 140ms timeout period after release. No external components are required unless additional noise filtering (e.g., 0.1µF capacitor to GND) is needed.
How does the watchdog function work in MAX6321HPUK26CY+T, and what is its timeout period?
The MAX6321HPUK26CY+T watchdog timer resets on any rising or falling edge at the WDI pin and times out after 1.6s if unserviced. This interval is factory-trimmed and typical; the timer clears automatically during reset assertion. Disabling the watchdog requires leaving WDI unconnected or three-stating the driving source.
What type of reset output does MAX6321HPUK26CY+T provide, and why is it significant?
MAX6321HPUK26CY+T provides an active-low open-drain RESET output, which requires an external pullup resistor but enables interface with multiple supply domains (up to 6V). This architecture eliminates level-shifter components in mixed-voltage systems - for example, coordinating reset between a 3.3V MCU and 5V CAN transceiver using a single 10kΩ pullup to 5V.
Is MAX6321HPUK26CY+T qualified for automotive applications, and what standards does it meet?
Yes, MAX6321HPUK26CY+T is AEC-Q100 qualified for automotive use, supporting Grade 3 temperature range (-40°C to +125°C). It meets stringent reliability and stress-test requirements for deployment in body control modules, infotainment systems, and ADAS domain controllers where functional safety and long-term stability are critical.
MAX6321HPUK26CY+T 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:
- 2.63V
- 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
MAX6321HPUK26CY+T FAQ
1.How can I place an order for MAX6321HPUK26CY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6321HPUK26CY+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 MAX6321HPUK26CY+T reliable?
The price and inventory of MAX6321HPUK26CY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6321HPUK26CY+T is usually 5 days.
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MAX6321HPUK26CY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6321HPUK26CY+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 MAX6321HPUK26CY+T?
For technical support, including MAX6321HPUK26CY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6321HPUK26CY+T requirements.
6.How does Aetrix verify that MAX6321HPUK26CY+T is sourced from the original manufacturer or authorized distributors?
All MAX6321HPUK26CY+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 MAX6321HPUK26CY+T meets industry standards.
7.What is the process for return or replacement of MAX6321HPUK26CY+T?
All MAX6321HPUK26CY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6321HPUK26CY+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 MAX6321HPUK26CY+T part is unused and in its original packaging.
Return procedure for MAX6321HPUK26CY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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