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Analog Devices Inc./Maxim Integrated MAX6320PUK31BX
- Part No.:
- MAX6320PUK31BX
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6320PUK31BX.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:35,000
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Product details
Overview
MAX6320PUK31BX from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 3.1V 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, provides manual reset input, and asserts reset during brownout, software hang, or external fault - used in portable computers and embedded control systems.
For engineers reviewing the MAX6320PUK31BX datasheet, MAX6320PUK31BX pinout, MAX6320PUK31BX application, or MAX6320PUK31BX equivalent, this page delivers verified electrical specs, SOT23 terminal mapping, real-world use cases for battery-powered equipment, and validated alternative parts with documented functional differences.
Technical Context
The MAX6320PUK31BX implements a precision voltage monitor with factory-laser-trimmed resistor divider setting VRST = 3.1V, guaranteed valid reset assertion down to VCC = 1V. Its open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V) and features <1.0µA leakage when deasserted.
Watchdog functionality clears on any WDI edge (rising or falling) with 50ns pulse-width capability; MR input includes internal 52kΩ pullup and rejects 100ns transients. Immunity to negative VCC glitches (<4µs at 100mV under VRST) is confirmed across full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.1V ±2.5% (–40°C to +125°C); ensures reliable power-on reset for 3.3V systems with margin against rail sag |
| Reset Timeout Period | 140ms minimum; guarantees µP initialization completes before code execution resumes |
| Watchdog Timeout | 1.6s typical; detects firmware lockups in real-time embedded applications without false triggers |
| Supply Current | 5µA at VCC = 3.6V; enables multi-year operation in coin-cell–powered portable instruments |
| Operating Voltage Range | 1.0V to 5.5V; supports valid reset signaling even during deep brownout conditions |
| RESET Output Type | Active-low open-drain NMOS; allows level-shifting to higher-voltage rails (up to 6V pullup) |
| MR Input Threshold | VIL ≤ 0.3×VCC, VIH ≥ 0.7×VCC; compatible with 3.3V/5V logic families without external level translation |
Pinout & Package
MAX6320PUK31BX is housed in a lead-free 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), rated for –40°C to +125°C operation. Pin 1 is marked with a dot; pin numbering follows standard SOT23 top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset output; requires external pullup (e.g., 10kΩ to 3.3V/5V); sinks 3.2mA max at VCC ≥ 4.5V |
| 2 | GND | Ground reference for all internal circuits and reset timing; must be low-impedance connection |
| 3 | MR | Manual reset input; internally pulled up to VCC via 52kΩ; assert low ≥1.5µs to trigger reset |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears timer on transition; disable by leaving floating |
| 5 | VCC | Supply input; monitored for undervoltage; reset asserted when VCC falls below 3.1V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.1V with ±2.5% tolerance over full temperature range - eliminates need for external resistor network calibration |
| Open-drain RESET output | Supports mixed-voltage systems: pullup to any rail ≤6V, enabling interface with 1.8V/3.3V/5V µPs without level shifters |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe brownout - critical for fail-safe operation in battery-backed systems |
| Immunity to fast VCC transients | Rejects <4µs negative glitches at 100mV below VRST - prevents spurious resets in noisy automotive or industrial environments |
| No external components required | Integrates precision voltage reference, watchdog timer, MR pullup, and reset generator - reduces BOM count and PCB area |
Applications
| Portable/Battery-Powered Equipment | Embedded Control Systems |
|---|---|
Use Scenario: Power management in handheld medical devices powered by single Li-ion cells with wide discharge profile (4.2V → 2.8V). IC Role / Device Role / Timing Role: Monitors VCC decay, asserts open-drain RESET to halt MCU when voltage drops below 3.1V, preventing corrupted memory writes. Use Value: Prevents data corruption during battery exhaustion while enabling graceful shutdown via MR-triggered firmware routine. |
Use Scenario: Industrial PLC module requiring deterministic restart after ESD-induced µP lockup. IC Role / Device Role / Timing Role: WDI connected to GPIO toggled by watchdog service routine; failure to toggle within 1.6s forces hardware reset. Use Value: Eliminates need for operator intervention or power cycle - system recovers autonomously within 140ms of fault detection. |
| Intelligent Instruments | Controllers |
Use Scenario: Digital multimeter with auto-ranging logic that must initialize sensors and ADCs reliably at power-up. IC Role / Device Role / Timing Role: Provides 140ms minimum reset pulse synchronized to VCC ramp, ensuring all peripherals are held in reset until stable supply is confirmed. Use Value: Guarantees clean state machine startup - avoids sensor offset errors or ADC conversion faults caused by premature clock enable. |
Use Scenario: HVAC controller using 3.3V ARM Cortex-M0 MCU where MR button initiates field-service recalibration. IC Role / Device Role / Timing Role: MR pin accepts momentary switch to ground; internal 52kΩ pullup eliminates external resistor, reducing component count. Use Value: Enables cost-effective, space-constrained front-panel reset without debouncing circuitry or additional passives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6320PUK29CY-T | 2.93V reset threshold (vs. 3.1V); same 140ms tRP and 1.6s tWD; identical SOT23-5 package and pinout | Suitable for 2.9V–3.0V nominal supply systems where tighter margin below 3.1V is required | Select when VCC nominal is closer to 2.9V and 3.1V would risk premature reset assertion during normal operation |
| TPS3808G33DBVR | 3.3V fixed threshold; 200ms min tRP; no watchdog; push/pull active-low RESET; same SOT23-5 footprint | Lacks watchdog and manual reset; simpler function set for basic power monitoring only | Choose when watchdog functionality is unnecessary and lower quiescent current (1.5µA) is prioritized over feature completeness |
Compared with MAX6320PUK31BX, MAX6320PUK29CY-T offers a lower reset threshold for tighter 2.9V-system margin, while TPS3808G33DBVR trades watchdog/manual reset for ultra-low ICC and simplified design - neither is pin-compatible due to differing RESET output structure (open-drain vs. push/pull) and missing WDI/MR pins.
Availability
MAX6320PUK31BX is available at Aetrix Electronics and suitable for portable computers, embedded control systems, and intelligent instruments requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6320PUK31BX 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 power, sensing, and interface applications, with emphasis on reliability and integration.
The MAX6316–MAX6322 family targets power-supply monitoring in space-constrained, battery-operated, and industrial systems - delivering precision reset supervision with minimal external components and extended temperature operation.
FAQ
What is the exact reset threshold voltage of MAX6320PUK31BX and how tightly is it specified?
The MAX6320PUK31BX has a factory-trimmed nominal reset threshold of 3.1V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This specification is confirmed in the Electrical Characteristics table of the official datasheet, and applies to all units regardless of lot or date code. The 31 in the part number directly encodes the 3.1V threshold per Maxim's ordering convention.
Does MAX6320PUK31BX support watchdog functionality, and what is its timeout period?
Yes, MAX6320PUK31BX includes a watchdog timer with a typical timeout period of 1.6 seconds, corresponding to the 'Y' suffix in its ordering code. The watchdog clears on any rising or falling edge at the WDI pin and is disabled when WDI is left unconnected or three-stated. This 1.6s timeout is validated across temperature and supply voltage per the datasheet's Table 3.
What type of reset output does MAX6320PUK31BX provide, and what external components are required?
MAX6320PUK31BX provides an active-low open-drain RESET output (Pin 1), requiring an external pullup resistor to a logic rail (≤6V). A 10kΩ resistor to 3.3V or 5V is sufficient in most applications. No other external components - such as capacitors, resistors for threshold setting, or debouncing networks - are needed, as all supervision functions are fully integrated.
Can MAX6320PUK31BX operate reliably during deep brownout conditions?
Yes, MAX6320PUK31BX guarantees valid reset assertion down to VCC = 1.0V, as explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset behavior even as the supply collapses - a key requirement for fail-safe operation in battery-powered systems where VCC may dip below 2.0V before shutdown.
How is the manual reset (MR) input configured, and what is its electrical behavior?
The MR input (Pin 3) of MAX6320PUK31BX features an internal 52kΩ pullup resistor to VCC, allowing it to be left unconnected when unused. It accepts TTL- or CMOS-level logic: VIL ≤ 0.3×VCC and VIH ≥ 0.7×VCC. A low pulse ≥1.5µs asserts reset, and reset remains active for the full 140ms timeout period after MR returns high - all confirmed in the datasheet's Electrical Characteristics and Detailed Description sections.
MAX6320PUK31BX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6320PUK31BX FAQ
1.How can I place an order for MAX6320PUK31BX through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6320PUK31BX 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 MAX6320PUK31BX reliable?
The price and inventory of MAX6320PUK31BX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6320PUK31BX is usually 5 days.
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Once your MAX6320PUK31BX 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 MAX6320PUK31BX?
For technical support, including MAX6320PUK31BX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6320PUK31BX requirements.
6.How does Aetrix verify that MAX6320PUK31BX is sourced from the original manufacturer or authorized distributors?
All MAX6320PUK31BX 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 MAX6320PUK31BX meets industry standards.
7.What is the process for return or replacement of MAX6320PUK31BX?
All MAX6320PUK31BX units undergo pre-shipment inspection (PSI). If there is an issue with MAX6320PUK31BX, 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 MAX6320PUK31BX part is unused and in its original packaging.
Return procedure for MAX6320PUK31BX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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