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Analog Devices Inc./Maxim Integrated MAX6362HUT31
- Part No.:
- MAX6362HUT31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6362HUT31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,470
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Product details
Overview
MAX6362HUT31 from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, designed for battery-backed µP systems requiring reliable power monitoring and fail-safe reset generation. It operates from +1.2V supply, features a factory-preset 3.08V reset threshold (±1.5% over -40°C to +85°C), 1.6s watchdog timeout, 150ms minimum reset timeout, and active-low open-drain RESET output. It is used in portable instrumentation and industrial controllers where brownout resilience and autonomous watchdog supervision are critical.
For engineers reviewing the MAX6362HUT31 datasheet, MAX6362HUT31 pinout, MAX6362HUT31 application, or MAX6362HUT31 equivalent, key selection criteria include its SOT23-6 package, 3.08V reset threshold accuracy, guaranteed reset assertion down to 1.2V VCC/VBATT, watchdog input (WDI) timing behavior, and battery switchover hysteresis-critical for SRAM backup integrity in power-fail scenarios.
Technical Context
The MAX6362HUT31 implements a precision voltage comparator with internal 1.235V reference to monitor VCC against its factory-trimmed 3.08V threshold. Its watchdog function uses an RC-based timer that resets on any WDI edge (rising or falling) within the 1.6s timeout window; failure to toggle WDI triggers a pulse-mode reset assertion lasting ≥150ms.
This device integrates dual-path power switching: when VCC falls below VTH and VBATT exceeds VCC by ≥20mV, it automatically connects the backup battery to OUT via a low-on-resistance MOSFET (typ. 2.63Ω at VBATT = 2.8V). The RESET output remains asserted during VCC undervoltage, manual reset (not applicable here), or watchdog timeout events-ensuring deterministic µP initialization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% (factory preset; enables precise monitoring of +3.3V/+3.0V rails) |
| Watchdog Timeout | 1.6s typical (±35%; ensures µP software liveliness detection without false triggers) |
| Reset Timeout Period | 150ms minimum (guarantees stable µP reset hold time after power recovery) |
| Supply Voltage Range | +1.2V to +5.5V (supports operation during deep brownout and battery-only backup) |
| 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 flexible pull-up voltage selection) |
| Operating Temperature | -40°C to +85°C (qualified for industrial and extended-temperature embedded applications) |
Pinout & Package
MAX6362HUT31 is housed in a 6-pin SOT23 package (U6-1 outline, 21-0058), measuring 2.9mm × 1.6mm × 1.1mm, with lead-free RoHS-compliant termination. Pin 1 is marked with a dot; pin numbering follows standard SOT23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, watchdog timeout, or power-down; requires external pull-up for logic-level compatibility |
| 2: GND | Ground reference | Primary return path for VCC, BATT, and internal circuitry; must be low-impedance connection |
| 3: WDI | Watchdog input | Edge-sensitive input; rising or falling transition within 1.6s clears internal timer; static high/low >1.6s triggers reset pulse |
| 4: VCC | Main supply input | Primary power source; monitored for reset assertion; powers internal circuitry and drives OUT when above VTH |
| 5: OUT | Power output | Supplies SRAM or real-time clock; sourced from VCC if VCC > VTH, or from BATT if VCC < VTH and VBATT > VCC + 20mV |
| 6: BATT | Backup battery input | Provides backup power to OUT during VCC brownout; activates only when VCC falls below VTH and VBATT exceeds VCC by ≥20mV |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables robust firmware crash detection without external components or µP intervention |
| Factory-trimmed 3.08V reset threshold | Eliminates external resistor networks for +3.3V/+3.0V rail monitoring; ±1.5% tolerance ensures design margin |
| Battery switchover with 40mV hysteresis | Prevents oscillation during slow VCC decay; guarantees clean transition between main and backup power sources |
| 150ms minimum reset timeout | Meets µP reset timing requirements across all supply voltages down to 1.2V |
| 11µA quiescent current at 2.8V | Extends lithium coin-cell life beyond 10 years in standby battery-backup mode |
Applications
| Portable Medical Instrumentation | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Handheld blood glucose meters and portable ECG monitors require nonvolatile memory retention during battery replacement or AC power loss. IC Role / Device Role / Timing Role: MAX6362HUT31 monitors main supply and asserts RESET while switching SRAM power from VCC to BATT; its 1.6s watchdog detects firmware hangs during measurement cycles. Use Value: Prevents data corruption during power transitions and ensures automatic recovery from software lockups without user intervention. |
Use Scenario: Remote I/O modules in factory automation operate unattended for months, powered by 24V DC with local Li-ion backup. IC Role / Device Role / Timing Role: MAX6362HUT31 supervises the 3.3V logic rail, triggers reset on undervoltage, and uses WDI to verify cyclic fieldbus communication integrity. Use Value: Guarantees deterministic restart after brownouts and detects stalled communication stacks before process faults escalate. |
| Smart Utility Meters | POS Terminal Battery Backup |
|
Use Scenario: Electricity/water meters retain tamper logs and billing data in SRAM during grid outages using onboard coin cells. IC Role / Device Role / Timing Role: MAX6362HUT31 provides VCC monitoring, battery switchover, and watchdog supervision of metrology firmware execution. Use Value: Ensures regulatory-compliant data persistence and prevents unauthorized firmware manipulation via watchdog-enforced code flow validation. |
Use Scenario: Retail point-of-sale terminals maintain transaction buffers and cryptographic keys in SRAM during AC power interruptions. IC Role / Device Role / Timing Role: MAX6362HUT31 asserts RESET and switches OUT to backup battery upon 3.3V rail collapse; WDI verifies payment processing thread liveness. Use Value: Eliminates transaction loss and maintains PCI-DSS compliance by guaranteeing secure state recovery after power anomalies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6362HUT44 | Factory-preset 4.50V reset threshold (vs. 3.08V); identical watchdog, package, and timing specs | Designed for +5.0V rail supervision instead of +3.3V/+3.0V; not interchangeable without circuit redesign | Select only when monitoring higher-voltage supplies; pinout and functionality otherwise identical |
| TPS3808G33DBVR | 3.3V reset threshold, 200ms reset timeout, no integrated watchdog; 6-pin SOT23 package | Lacks autonomous watchdog capability; requires external timing or µP-driven reset management | Choose when watchdog is unnecessary and tighter 3.3V threshold tolerance (±0.5%) is prioritized over system-level fault detection |
Compared with MAX6362HUT31, MAX6362HUT44 offers identical architecture but targets +5V systems, while TPS3808G33DBVR trades watchdog functionality for improved reset threshold accuracy-making MAX6362HUT31 optimal for cost-sensitive, battery-backed µP systems needing both precise 3.08V monitoring and autonomous software supervision.
Availability
MAX6362HUT31 is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial PLC I/O modules, smart utility meters, and POS terminal battery backup requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6362HUT31 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX6361–MAX6364 family was engineered to replace discrete reset and battery switchover circuits in space-constrained, battery-powered µP systems-delivering precision supervision, low quiescent current, and integrated watchdog functionality in a 6-pin SOT23 package.
FAQ
What is the exact reset threshold voltage of MAX6362HUT31 and how tightly is it specified?
The MAX6362HUT31 has a factory-trimmed reset threshold of 3.08V, guaranteed over the full -40°C to +85°C operating temperature range with ±1.5% tolerance. This value is laser-trimmed during production and documented in the Electrical Characteristics table under "Reset Threshold" for suffix "31". The MAX6362HUT31 is specifically intended for reliable supervision of +3.3V and +3.0V power rails where this precise threshold avoids false resets during nominal operation.
Does MAX6362HUT31 support battery backup functionality, and how does switchover work?
Yes, MAX6362HUT31 supports automatic battery backup via its BATT and OUT pins. When VCC falls below the 3.08V reset threshold and VBATT exceeds VCC by at least 20mV, the device connects the backup battery to OUT through an internal MOSFET. Switchover includes 40mV hysteresis to prevent oscillation during slow VCC decay. The MAX6362HUT31 guarantees RESET assertion and OUT sourcing continuity throughout the transition, preserving SRAM data integrity.
What is the watchdog timeout behavior of MAX6362HUT31, and how is it cleared?
The MAX6362HUT31 features a 1.6s watchdog timeout period (typical, ±35%). The internal timer is cleared on every rising or falling edge at the WDI pin-no specific pulse polarity or width beyond 100ns minimum is required. If WDI remains static (high or low) longer than 1.6s, a reset pulse is generated on the RESET output for ≥150ms. The MAX6362HUT31 also clears the watchdog whenever RESET is asserted, enabling synchronized recovery sequences.
Can MAX6362HUT31 operate down to 1.2V supply, and what functions remain active?
Yes, MAX6362HUT31 is fully specified to operate from VCC or VBATT as low as +1.2V. At this voltage, the reset comparator remains functional, RESET output is guaranteed valid, and the watchdog timer continues to monitor WDI edges. Quiescent current drops to ~10µA, and battery switchover remains active-ensuring uninterrupted SRAM backup and µP reset signaling even during deep brownout conditions. This capability is explicitly confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables for MAX6362HUT31.
What package type and footprint does MAX6362HUT31 use, and are there layout considerations?
MAX6362HUT31 uses a 6-pin SOT23 package (outline U6-1, land pattern 90-0175), with 0.95mm pin pitch and standard JEDEC MO-178 dimensions. Critical layout practices include placing a 0.1µF ceramic bypass capacitor directly between VCC and GND, routing WDI away from noisy signals, and minimizing trace length between BATT and its decoupling capacitor to ensure clean switchover. The MAX6362HUT31 datasheet specifies these requirements in the Applications Information section to maintain transient immunity and reset accuracy.
MAX6362HUT31 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 High
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6362HUT31 FAQ
1.How can I place an order for MAX6362HUT31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6362HUT31 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 MAX6362HUT31 reliable?
The price and inventory of MAX6362HUT31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6362HUT31 is usually 5 days.
3.What payment methods are accepted for MAX6362HUT31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6362HUT31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6362HUT31?
MAX6362HUT31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6362HUT31 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 MAX6362HUT31?
For technical support, including MAX6362HUT31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6362HUT31 requirements.
6.How does Aetrix verify that MAX6362HUT31 is sourced from the original manufacturer or authorized distributors?
All MAX6362HUT31 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 MAX6362HUT31 meets industry standards.
7.What is the process for return or replacement of MAX6362HUT31?
All MAX6362HUT31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6362HUT31, 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 MAX6362HUT31 part is unused and in its original packaging.
Return procedure for MAX6362HUT31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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