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Analog Devices Inc./Maxim Integrated MAX6320PUK42CW+
- Part No.:
- MAX6320PUK42CW+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6320PUK42CW+.pdf
- Description:
- IC MPU/RESET CIRC 4.20V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,338
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Product details
Overview
MAX6320PUK42CW+ 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 4.2V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and 1.6s typical watchdog timeout. Designed for brownout protection and system recovery in battery-powered embedded controllers.
For engineers reviewing the MAX6320PUK42CW+ datasheet, MAX6320PUK42CW+ pinout, MAX6320PUK42CW+ application, or MAX6320PUK42CW+ 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 MAX6320PUK42CW+ integrates a precision voltage monitor, 140ms reset timeout generator, and 1.6s watchdog timer with edge-triggered WDI input. Its open-drain RESET output requires an external pullup resistor and supports interface with multiple supply domains (e.g., 3.3V µP with 5V pullup).
It includes a manual reset input (MR) with internal 52kΩ pullup, 100ns glitch rejection, and MR-to-reset propagation delay of 230ns at VCC = 5V. The device operates across 1.0V–5.5V supply range and guarantees functional reset assertion down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.2V nominal (4.095V–4.305V over -40°C to +125°C); enables precise brownout detection for 4.2V nominal rails. |
| Reset Timeout Period | 140ms minimum; ensures sufficient hold time for µP initialization after power stabilization. |
| Watchdog Timeout | 1.6s typical; provides robust software hang detection without excessive system interruption. |
| Supply Current | 5µA typical at VCC = 3.6V; minimizes quiescent power in always-on battery applications. |
| Operating Temperature | -40°C to +125°C; supports under-hood automotive and industrial embedded environments. |
| RESET Output Type | Active-low open-drain; allows flexible pullup to any voltage ≤6V, enabling mixed-supply reset bus design. |
| AEC-Q100 Qualified | Yes; certified for automotive applications per Grade 1 (-40°C to +125°C junction). |
Pinout & Package
MAX6320PUK42CW+ 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.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output; sinks current when asserted; requires external pullup to define logic-high level (up to 6V). |
| 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; debounced by 100ns glitch filter. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); resets internal timer on transition; disable by leaving floating. |
| 5 | VCC | Power supply input (1.0V–5.5V); reset asserted when VCC falls below 4.2V threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain RESET output | Supports level-shifting across supply domains (e.g., 3.3V µP with 5V pullup), eliminating need for external level translators. |
| Guaranteed reset down to VCC = 1V | Ensures deterministic reset behavior during deep brownout or ultra-low-power wake-up sequences. |
| Immunity to short VCC transients | Rejects negative glitches <4µs duration even when amplitude dips 100mV below reset threshold - no false resets. |
| No external components required | Integrates precision voltage reference, timing capacitors, and pullup resistor (for MR); reduces BOM count and PCB area. |
| AEC-Q100 Grade 1 qualification | Validated for automotive under-hood use with full temperature range operation and stress testing compliance. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Subsystem |
|---|---|
Use Scenario: Monitors 5V supply rail in BCM microcontroller that manages door locks, lighting, and window controls. IC Role / Device Role / Timing Role: Supervisory IC asserting open-drain RESET to µP during cold-crank voltage sag (down to 6V) or load-dump recovery. Use Value: Prevents erratic firmware execution during battery voltage transients; open-drain output allows shared reset bus with CAN transceivers powered from separate 3.3V rail. |
Use Scenario: Secures reliable startup and runtime monitoring of ARM-based PLC controller operating in factory-floor environment. IC Role / Device Role / Timing Role: Provides 140ms power-on reset hold time and 1.6s watchdog supervision to detect firmware lockups caused by EMI-induced memory corruption. Use Value: Guarantees µP reset assertion even if VCC drops to 1V during brownout; eliminates need for external RC network or discrete supervisor ICs. |
| Portable Medical Infusion Pump | Smart Energy Meter MCU |
Use Scenario: Ensures fail-safe restart of safety-critical pump controller after Li-ion battery voltage dip during motor surge. IC Role / Device Role / Timing Role: Active-low open-drain RESET output pulled to 3.3V (µP I/O domain), while VCC supplied from regulated 5V DC-DC converter. Use Value: Enables independent reset voltage domain scaling; 4.2V threshold matches nominal battery voltage, improving undervoltage detection resolution. |
Use Scenario: Supervises metrology SoC in ANSI C12.22-compliant electricity meter exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Delivers guaranteed reset function from -40°C to +125°C with ±2.5% threshold tolerance and 100ns MR glitch rejection. Use Value: Meets IEC 62056-21 long-term reliability requirements; AEC-Q100 qualification validates robustness against thermal cycling and solder fatigue. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6320PUK42DZ+ | Same 4.2V reset threshold and SOT23 package, but 25.6s watchdog timeout (Z) vs. 1.6s (Y) in MAX6320PUK42CW+. | Suitable for low-duty-cycle systems where extended watchdog interval prevents nuisance resets during long idle periods. | Select MAX6320PUK42DZ+ only if firmware execution cycles exceed 1.6s; otherwise MAX6320PUK42CW+ offers tighter supervision. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (not adjustable), push/pull active-low RESET, no manual reset input, 200ms reset timeout. | Lacks MR and watchdog; intended for simpler power-monitoring tasks without runtime supervision. | Choose TPS3808G33DBVR only when watchdog and manual reset are unnecessary and 3.3V threshold suffices. |
Compared with MAX6320PUK42DZ+, MAX6320PUK42CW+ provides faster watchdog response for real-time firmware validation; compared with TPS3808G33DBVR, it adds critical runtime supervision and user-initiated reset capability essential for field-upgradable embedded systems.
Availability
MAX6320PUK42CW+ is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC subsystems, portable medical devices, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6320PUK42CW+ 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 computing applications.
The MAX6316–MAX6322 family delivers compact, AEC-Q100-qualified supervisory solutions targeting space-constrained embedded systems requiring precise voltage monitoring, configurable reset timing, and robust watchdog supervision.
FAQ
What is the exact reset threshold voltage of MAX6320PUK42CW+ and how does it vary with temperature?
The MAX6320PUK42CW+ has a factory-trimmed nominal reset threshold of 4.2V, specified as 4.095V to 4.305V over the full operating temperature range of -40°C to +125°C. Its temperature coefficient is 40ppm/°C, meaning drift is tightly bounded and predictable across automotive and industrial environments. This precision eliminates need for external calibration in MAX6320PUK42CW+ designs.
Does MAX6320PUK42CW+ require an external pullup resistor on the RESET pin, and what value is recommended?
Yes, MAX6320PUK42CW+ features an open-drain RESET output and requires an external pullup resistor. A 10kΩ resistor is sufficient in most applications, connecting RESET to any supply voltage up to 6V. The value must ensure logic-low recognition (≤0.4V at 3.2mA sink) while maintaining fast rise time under total bus capacitance - verified in MAX6320PUK42CW+ electrical characteristics.
Can MAX6320PUK42CW+ operate reliably during cold-crank automotive battery conditions?
Yes, MAX6320PUK42CW+ guarantees functional reset assertion down to VCC = 1V and operates across -40°C to +125°C. Its 4.2V reset threshold aligns with nominal 12V battery systems (after regulation), and immunity to sub-4µs negative transients prevents false resets during cranking spikes - validated per AEC-Q100 Grade 1 requirements for MAX6320PUK42CW+.
How does the watchdog timer in MAX6320PUK42CW+ respond to WDI signal transitions?
The MAX6320PUK42CW+ watchdog timer clears on any rising or falling edge at WDI, with minimum pulse width of 50ns. If no transition occurs within 1.6s (typical), RESET asserts. Leaving WDI unconnected disables watchdog functionality, as the internal counter services itself at 7/8 of the timeout period - a behavior explicitly documented for MAX6320PUK42CW+ in the datasheet.
Is MAX6320PUK42CW+ pin-compatible with other members of the MAX6316–MAX6322 family?
Yes, all MAX6316–MAX6322 devices share identical 5-pin SOT23 pinout and footprint (U5+2A). However, reset output type varies: MAX6320PUK42CW+ uses open-drain, while MAX6316L/MAX6317H use push/pull and MAX6316M uses bidirectional. Swapping requires verifying RESET drive strength and external biasing - not a blind drop-in replacement despite identical MAX6320PUK42CW+ pin mapping.
MAX6320PUK42CW+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.2V
- Output:
- Open Drain or Open Collector
- Reset:
- 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
MAX6320PUK42CW+ FAQ
1.How can I place an order for MAX6320PUK42CW+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6320PUK42CW+ 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 MAX6320PUK42CW+ reliable?
The price and inventory of MAX6320PUK42CW+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6320PUK42CW+ is usually 5 days.
3.What payment methods are accepted for MAX6320PUK42CW+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6320PUK42CW+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6320PUK42CW+?
MAX6320PUK42CW+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6320PUK42CW+ 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 MAX6320PUK42CW+?
For technical support, including MAX6320PUK42CW+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6320PUK42CW+ requirements.
6.How does Aetrix verify that MAX6320PUK42CW+ is sourced from the original manufacturer or authorized distributors?
All MAX6320PUK42CW+ 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 MAX6320PUK42CW+ meets industry standards.
7.What is the process for return or replacement of MAX6320PUK42CW+?
All MAX6320PUK42CW+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6320PUK42CW+, 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 MAX6320PUK42CW+ part is unused and in its original packaging.
Return procedure for MAX6320PUK42CW+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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