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Analog Devices Inc./Maxim Integrated MAX6320PUK33BX+T
- Part No.:
- MAX6320PUK33BX+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6320PUK33BX+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,682
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Product details
Overview
The MAX6320PUK33BX+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, manual reset input, and watchdog timer. It features a factory-trimmed 3.3V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. Designed for brownout detection and system recovery in battery-powered embedded controllers.
For engineers reviewing the MAX6320PUK33BX+T datasheet, MAX6320PUK33BX+T pinout, MAX6320PUK33BX+T application, or MAX6320PUK33BX+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under VTH), open-drain output compatible with mixed-voltage reset buses up to 6V, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
This device implements a voltage-monitoring reset generator with independent manual reset assertion and edge-triggered watchdog supervision. The internal voltage reference uses laser-trimmed resistors to achieve ±1.5% accuracy at +25°C and ±2.5% over full temperature range, with 40ppm/°C temperature coefficient.
The open-drain RESET output requires an external pullup resistor (typically 10kΩ) to any supply ≤6V; it sinks ≥1.2mA at VCC ≥2.7V while maintaining VOL ≤0.3V. The WDI input detects rising/falling edges to clear the watchdog timer, which times out after 1.6s if unrefreshed - disabling the watchdog requires leaving WDI floating or three-stating the driver.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.3V nominal (VTH ±2.5% from -40°C to +125°C); ensures reliable power-on reset for 3.3V systems |
| Reset Timeout Period | 140ms minimum (MAX63__C_-T variant); holds reset long enough for stable clock and memory initialization |
| Watchdog Timeout | 1.6s typical (MAX63__Y-T variant); provides sufficient margin for firmware execution loops without false triggers |
| Supply Current | 5µA typical at VCC = 3.6V; enables ultra-low-power operation in battery-backed applications |
| Operating Voltage | 1.0V to 5.5V; guarantees valid reset assertion even during deep brownout conditions |
| Output Type | Active-low open-drain RESET; allows wired-OR connection with multiple supervisors or µP reset pins on shared bus |
| Temperature Range | -40°C to +125°C; qualified per AEC-Q100 Grade 1 for under-hood automotive use |
Pinout & Package
Package: 5-pin SOT23 (U5+2A), 1.6mm × 2.9mm footprint, RoHS-compliant lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output; must be pulled up externally to any voltage ≤6V; sinks ≥1.2mA at VCC ≥2.7V |
| 2 | GND | Ground reference for all internal circuits and reset timing; connects to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 52kΩ resistor; asserts reset for full tRP upon low-to-high transition |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on each transition; disable by leaving unconnected |
| 5 | VCC | Supply input; monitors voltage level against 3.3V threshold; reset asserted when VCC falls below VRST |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, reset timer, and watchdog logic eliminate need for discrete RC networks or comparators |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout, preventing undefined µP states before full power collapse |
| Immunity to short negative VCC transients | Rejects <4µs glitches at 100mV below VTH - avoids spurious resets from switching noise or ESD-induced supply dips |
| AEC-Q100 qualified | Validated for automotive applications including engine control, body electronics, and ADAS subsystems |
| Open-drain output with 6V tolerance | Enables interoperability across mixed-voltage domains (e.g., 3.3V supervisor driving 5V µP reset line) |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 3.3V microcontroller supply in diesel engine ECU exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low reset on brownout; watchdog guards against firmware lockup during CAN communication faults. Use Value: Prevents erratic actuator commands during transient undervoltage; 140ms reset hold time ensures safe shutdown of fuel injectors and ignition drivers. |
Use Scenario: Supervises ARM Cortex-M4 core in modular PLC base unit operating in factory-floor environments with EMI and voltage sags. IC Role / Device Role / Timing Role: Primary reset generator with manual reset button interface and watchdog supervision of real-time task scheduler. Use Value: Open-drain output allows shared reset bus with fieldbus transceivers; AEC-Q100 qualification ensures reliability in industrial temperature cycling. |
| Portable Medical Infusion Pump | Battery-Powered Smart Sensor Node |
|
Use Scenario: Ensures fail-safe restart of safety-critical dosing controller powered by Li-ion battery with aging-related voltage droop. IC Role / Device Role / Timing Role: Brownout detector with 3.3V threshold tracking battery discharge curve; MR input enables clinician-initiated recalibration reset. Use Value: 5µA supply current extends battery life; guaranteed reset down to VCC = 1V prevents silent failure during deep discharge. |
Use Scenario: Supervises ultra-low-power BLE SoC in environmental monitoring node deployed in remote locations for multi-year operation. IC Role / Device Role / Timing Role: Power-on supervisor and software watchdog for firmware integrity checking between sensor readouts. Use Value: 1.6s watchdog timeout aligns with BLE connection interval; open-drain output simplifies PCB routing in space-constrained modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6320PUK33DY+T | Same 3.3V threshold and 140ms reset timeout, but 25.6s watchdog period (Z-suffix) instead of 1.6s (Y-suffix) | Suitable for slower-firmware systems requiring longer watchdog grace periods, e.g., energy-harvesting nodes with infrequent wakeups | Select when extended watchdog timeout is needed; otherwise identical pinout, package, and electrical behavior |
| TPS3808G33DBVR | 3.3V threshold, 200ms reset delay, push-pull active-low output; no manual reset input; 1.8µA typical ICC at 3.6V | Lacks MR and watchdog; optimized for lowest quiescent current in non-watchdog applications like simple power sequencing | Choose only if watchdog and manual reset are unnecessary; not drop-in due to missing MR/WDI pins and different output drive |
Compared with MAX6320PUK33BX+T, the MAX6320PUK33DY+T offers identical supervision functionality with extended watchdog timing, while the TPS3808G33DBVR reduces supply current by ~70% but sacrifices both watchdog and manual reset capability - making it suitable only for simpler reset-only use cases.
Availability
MAX6320PUK33BX+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 lifecycle support.
Supply support for MAX6320PUK33BX+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.
The MAX6316–MAX6322 family delivers highly integrated µP supervisory functions - combining voltage monitoring, manual reset, and watchdog timers in miniature SOT23 packages for space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6320PUK33BX+T and how does it vary with temperature?
The MAX6320PUK33BX+T has a nominal reset threshold of 3.3V, specified as 3.218V (min) to 3.383V (max) over the full -40°C to +125°C operating range. At +25°C, it is trimmed to 3.300V ±1.5%. Its temperature coefficient is 40ppm/°C, meaning drift is predictable and bounded within datasheet limits - critical for robust brownout detection in automotive and industrial environments where MAX6320PUK33BX+T operates.
Does MAX6320PUK33BX+T require an external pullup resistor on the RESET pin, and what value is recommended?
Yes, MAX6320PUK33BX+T features an open-drain RESET output and requires an external pullup resistor. A 10kΩ resistor to any supply ≤6V is recommended for most applications. This value ensures VOL ≤0.3V when sinking 1.2mA (at VCC ≥2.7V) while providing adequate rise time for typical bus capacitance. The MAX6320PUK33BX+T datasheet confirms this value supports logic-high recognition across temperature and voltage ranges.
Can the watchdog function of MAX6320PUK33BX+T be disabled, and if so, how?
Yes, the watchdog function of MAX6320PUK33BX+T is disabled by leaving the WDI pin unconnected or by three-stating the driver connected to it. When floating, the internal watchdog timer is automatically serviced at intervals equal to 7/8 of the nominal timeout period (1.4s for MAX6320PUK33BX+T), preventing unintended resets. This hardware-based disable method requires no configuration registers or software intervention - a key reliability feature of MAX6320PUK33BX+T.
What is the minimum supply voltage at which MAX6320PUK33BX+T guarantees valid reset output levels?
MAX6320PUK33BX+T guarantees valid reset output behavior down to VCC = 1.0V. Specifically, the open-drain RESET output maintains VOL ≤0.3V when sinking 50µA (VCC >1.0V) and continues asserting low until VCC rises above the 3.3V threshold plus hysteresis. This specification ensures deterministic reset assertion during deep brownout events - a documented design requirement for MAX6320PUK33BX+T in automotive and industrial safety-critical systems.
Is MAX6320PUK33BX+T pin-compatible with other members of the MAX6316–MAX6322 family?
Yes, MAX6320PUK33BX+T shares the identical 5-pin SOT23 (U5+2A) package and pinout with all MAX6316–MAX6322 variants. Pin 1 is RESET (open-drain), Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC - consistent across the family. However, functional differences exist: MAX6320PUK33BX+T includes both MR and WDI, whereas some variants omit one or both. Always verify function mapping using the Selector Guide before substitution - MAX6320PUK33BX+T is not functionally interchangeable with push-pull or bidirectional-output variants.
MAX6320PUK33BX+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:
- 3.3V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6320PUK33BX+T FAQ
1.How can I place an order for MAX6320PUK33BX+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6320PUK33BX+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 MAX6320PUK33BX+T reliable?
The price and inventory of MAX6320PUK33BX+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6320PUK33BX+T is usually 5 days.
3.What payment methods are accepted for MAX6320PUK33BX+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6320PUK33BX+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6320PUK33BX+T?
MAX6320PUK33BX+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6320PUK33BX+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 MAX6320PUK33BX+T?
For technical support, including MAX6320PUK33BX+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6320PUK33BX+T requirements.
6.How does Aetrix verify that MAX6320PUK33BX+T is sourced from the original manufacturer or authorized distributors?
All MAX6320PUK33BX+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 MAX6320PUK33BX+T meets industry standards.
7.What is the process for return or replacement of MAX6320PUK33BX+T?
All MAX6320PUK33BX+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6320PUK33BX+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 MAX6320PUK33BX+T part is unused and in its original packaging.
Return procedure for MAX6320PUK33BX+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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