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Analog Devices Inc./Maxim Integrated MAX6362PUT31
- Part No.:
- MAX6362PUT31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6362PUT31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,309
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Product details
Overview
MAX6362PUT31 from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery switchover, and power-fail warning functionality. It operates from +1.2V supply, features factory-preset 3.08V reset threshold, 1.6s watchdog timeout, 150ms minimum reset timeout, and active-low open-drain RESET output in a 6-pin SOT23 package. It is used in portable/battery-powered equipment to maintain SRAM data integrity during brownout.
For engineers reviewing the MAX6362PUT31 datasheet, MAX6362PUT31 pinout, MAX6362PUT31 application, or MAX6362PUT31 equivalent, key selection criteria include guaranteed reset assertion down to 1.2V supply, watchdog input (WDI) edge-triggered timing behavior, battery switchover hysteresis (40mV), and compatibility with +2.5V/+3.3V/+5.0V power rails.
Technical Context
The MAX6362PUT31 implements a dedicated watchdog timer with 1.6s nominal timeout (1.00–2.25s over temperature), triggered by absence of WDI transitions. Its internal comparator monitors VCC against a precision 3.08V threshold (±1.5% over -40°C to +85°C), asserting reset when VCC falls below threshold and holding for ≥150ms after recovery.
Battery switchover occurs automatically when VCC drops below VBATT − 0.15V (min), connecting BATT to OUT via an internal MOSFET with on-resistance ≤2.7Ω at VBATT = 2.8V. The device guarantees RESET/RESET validity down to 1.2V supply and provides 100ns glitch immunity on WDI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% - precisely monitors +3.3V rail for undervoltage detection |
| Watchdog Timeout | 1.6s (1.00–2.25s) - ensures µP software hangs are detected within defined window |
| Reset Timeout Period | 150ms min - holds µP in reset long enough for stable power-up sequencing |
| Supply Voltage Range | +1.2V to +5.5V - supports operation directly from single-cell Li+ or coin-cell batteries |
| Quiescent Current | 11µA at VCC = 2.8V - enables multi-year battery life in always-on backup mode |
| Output Type | Active-low open-drain RESET - allows wired-OR configuration and level translation |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC decay near VBATT crossing |
Pinout & Package
Package: 6-pin SOT23 (U6-1), -40°C to +85°C operating range, RoHS-compliant lead-free (indicated by "+T" suffix; this part uses "-T").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, WDI timeout, or power-down; requires external pull-up |
| 2 - GND | Ground reference | Common return path for VCC, BATT, and all internal circuitry |
| 3 - WDI | Watchdog input | Edge-sensitive input; rising/falling edges within 1.6s clear internal timer; static high/low triggers reset |
| 4 - VCC | Main supply input | Primary power source; monitored for reset threshold violation; powers internal logic and OUT when active |
| 5 - OUT | Power output | Switches between VCC and BATT based on voltage comparison; supplies up to 150mA to SRAM or real-time clock |
| 6 - BATT | Backup battery input | Secondary power source; connected to OUT only when VCC < VBATT − 0.15V; draws ≤0.05µA standby current |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables reliable detection of µP lockup without external timing components |
| Guaranteed 1.2V operation | Ensures reset assertion remains valid even as primary supply decays to single-cell battery levels |
| 40mV battery switchover hysteresis | Eliminates chattering during gradual VCC collapse near VBATT, preserving memory data integrity |
| 150ms minimum reset timeout | Meets JEDEC JESD78 requirements for µP initialization stability after power recovery |
| 100ns WDI glitch immunity | Rejects noise-induced false watchdog triggers in electrically noisy embedded environments |
Applications
| Portable Medical Devices | Industrial Data Loggers |
|---|---|
|
Use Scenario: Battery-powered glucose meters or ECG monitors retain calibration data and time stamps during AC power loss or battery swap. IC Role / Device Role / Timing Role: MAX6362PUT31 monitors main supply and asserts reset while switching SRAM to coin-cell backup; WDI confirms firmware execution. Use Value: Prevents data corruption during brownout with guaranteed 1.2V reset validity and 40mV switchover hysteresis. |
Use Scenario: Remote environmental sensors log temperature/humidity continuously using flash memory powered by Li+ battery. IC Role / Device Role / Timing Role: MAX6362PUT31 provides power-fail warning and initiates graceful shutdown sequence before VCC drops below MCU operating range. Use Value: 150ms reset timeout ensures complete write-cycle completion to nonvolatile memory prior to power loss. |
| POS Terminals | Smart Meters |
|
Use Scenario: Retail point-of-sale terminals maintain transaction buffer integrity during brief utility outages or battery replacement. IC Role / Device Role / Timing Role: MAX6362PUT31's WDI input verifies host processor responsiveness; BATT-to-OUT switchover sustains RAM during 100ms–500ms gaps. Use Value: 1.6s watchdog timeout aligns with typical POS firmware task loop duration, enabling rapid hang detection. |
Use Scenario: Electricity/water meters retain billing data and tamper logs during grid instability or battery depletion. IC Role / Device Role / Timing Role: MAX6362PUT31 acts as dual-function supervisor: VCC monitor for main supply and WDI watchdog for metrology firmware. Use Value: Factory-trimmed 3.08V threshold matches +3.3V LDO output tolerance, minimizing false resets under load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6362HUT31 | Same electrical specs, but offered in leaded (SnPb) SOT23 instead of lead-free (-T) | Required where RoHS exemption applies or legacy assembly processes mandate Pb-based solder | Select only if Pb-containing packaging is explicitly required by manufacturing or regulatory policy |
| MAX6362LUT31 | Identical function and pinout, but specified for extended -40°C to +125°C temperature range | Suitable for under-hood automotive or industrial control cabinets with higher ambient thermal stress | Choose when operating ambient exceeds +85°C; otherwise MAX6362PUT31 offers optimal cost/performance for commercial temp range |
Compared with MAX6362HUT31 and MAX6362LUT31, the MAX6362PUT31 delivers identical core supervision functionality at lower cost for standard commercial temperature applications, with verified lead-free compliance and optimized quiescent current (11µA) for battery longevity.
Availability
MAX6362PUT31 is available at Aetrix Electronics and suitable for portable medical devices, industrial data loggers, POS terminals, smart meters, and battery-backed memory systems requiring stable component supply across production lifecycles.
Supply support for MAX6362PUT31 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, mixed-signal, and power management ICs for demanding industrial, computing, and communications applications.
The MAX6361–MAX6364 family was engineered specifically for low-voltage, battery-critical µP supervision-emphasizing ultra-low quiescent current, robust switchover hysteresis, and guaranteed operation down to 1.2V to extend runtime in portable equipment.
FAQ
What is the exact reset threshold voltage of the MAX6362PUT31?
The MAX6362PUT31 has a factory-trimmed reset threshold of 3.08V, with ±1.5% tolerance over the full -40°C to +85°C temperature range. This value is confirmed in the Electrical Characteristics table of the official datasheet (Rev 4, October 2011), and corresponds to the "31" suffix in the part number per the Ordering Information table.
Does the MAX6362PUT31 require an external pull-up resistor on the RESET pin?
Yes, the MAX6362PUT31 features an active-low open-drain RESET output, which requires an external pull-up resistor to the appropriate logic rail (e.g., 3.3V or 5V). The datasheet specifies a maximum sink current of 20mA and recommends a pull-up value that ensures VOL ≤ 0.3V at the target IOL, typically 10kΩ for standard CMOS inputs.
How does the watchdog timer in the MAX6362PUT31 respond to software stalls?
The MAX6362PUT31 watchdog timer triggers a reset pulse if the WDI input remains static (high or low) beyond 1.6s (1.00–2.25s over temperature). Each rising or falling edge on WDI clears the timer, making it ideal for monitoring deterministic firmware loops. The reset pulse duration is fixed at ≥150ms, ensuring reliable µP restart.
Can the MAX6362PUT31 operate without a backup battery connected?
Yes - the MAX6362PUT31 functions as a standard supervisory circuit without BATT. To disable battery switchover, connect BATT to GND and tie OUT to VCC. The device will still assert RESET on VCC undervoltage and respond to WDI activity, but battery backup functionality is inactive.
What is the maximum continuous output current capability of the OUT pin on the MAX6362PUT31?
The OUT pin of the MAX6362PUT31 can deliver up to 150mA when powered from VCC (at VCC = 4.75V), 65mA at VCC = 3.15V, and 25mA at VCC = 2.38V. These values are specified in the Electrical Characteristics table under "VCC to OUT On-Resistance" and reflect the internal MOSFET's RON-limited current sourcing capability.
MAX6362PUT31 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6362PUT31 FAQ
1.How can I place an order for MAX6362PUT31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6362PUT31 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 MAX6362PUT31 reliable?
The price and inventory of MAX6362PUT31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6362PUT31 is usually 5 days.
3.What payment methods are accepted for MAX6362PUT31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6362PUT31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6362PUT31?
MAX6362PUT31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6362PUT31 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 MAX6362PUT31?
For technical support, including MAX6362PUT31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6362PUT31 requirements.
6.How does Aetrix verify that MAX6362PUT31 is sourced from the original manufacturer or authorized distributors?
All MAX6362PUT31 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 MAX6362PUT31 meets industry standards.
7.What is the process for return or replacement of MAX6362PUT31?
All MAX6362PUT31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6362PUT31, 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 MAX6362PUT31 part is unused and in its original packaging.
Return procedure for MAX6362PUT31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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