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Analog Devices Inc./Maxim Integrated MAX6366HKA31+
- Part No.:
- MAX6366HKA31+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366HKA31+.pdf
- Description:
- MAX6366 LOW-POWER MICROPROCESSO
- Quantity:
- Payment:
- Shipping:
Inventory:2,236
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Product details
Overview
The MAX6366HKA31+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors VCC supply voltage (reset threshold = 3.08V), asserts active-high open-drain RESET on power-up/down/brownout or watchdog timeout, supports 1.2V–5.5V operation, and delivers up to 150mA from VCC or backup battery to SRAM in portable industrial controllers.
For engineers reviewing the MAX6366HKA31+ datasheet, MAX6366HKA31+ pinout, MAX6366HKA31+ application, or MAX6366HKA31+ equivalent, key selection criteria include its 3.08V reset threshold, 1.6s watchdog timeout, 150ms minimum reset timeout, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained µP systems requiring reliable brownout recovery and memory write protection.
Technical Context
The MAX6366HKA31+ implements a precision voltage monitor with ±1.5% threshold accuracy over temperature, a monostable watchdog timer triggered by WDI edge transitions, and a bidirectional MOSFET-based VCC/BATT switchover path with 40mV hysteresis. Its CE IN-to-CE OUT transmission gate provides 1.5ns propagation delay and 20Ω on-resistance during normal operation.
Reset assertion is synchronized to VCC crossing the factory-trimmed 3.08V threshold (min 3.00V, max 3.15V), with guaranteed validity down to 1.2V supply. The watchdog timeout is fixed at 1.6s (min 1.00s, max 2.25s) and clears on any WDI edge or reset assertion - no software configuration required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (factory-trimmed, ±1.5% over -40°C to +85°C); ensures reliable detection of 3.3V rail brownout before µP malfunction |
| Watchdog Timeout | 1.6s (typical); provides deterministic fault recovery window for firmware hang detection in embedded control loops |
| Reset Timeout Period | 150ms (min); guarantees µP initialization completes before release, preventing premature code execution |
| Quiescent Current | 10µA (typical at +25°C); enables multi-year battery life in always-on backup mode for RTC/SRAM retention |
| VCC Operating Range | 1.2V to 5.5V; supports direct interface with Li-ion, coin-cell, and logic-supply rails without external regulators |
| Output Type | Open-drain active-high RESET; allows wired-OR configuration with other system reset sources and flexible pull-up voltage selection |
| Package | 8-pin SOT23; 2.9mm × 1.6mm footprint compatible with high-density PCB layouts and automated assembly |
Pinout & Package
MAX6366HKA31+ uses an 8-pin SOT23 package with standard pinout per Maxim's official pin configuration diagram for MAX6366 series.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC < 3.08V, WDI timeout, or MR low; requires external pull-down for active-low µP interface |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; held low during reset to prevent write corruption during power faults |
| 3 GND | Ground reference | Common return for all internal circuits; must be low-impedance connection to minimize noise coupling |
| 4 WDI | Watchdog input | Edge-sensitive trigger (rising/falling/100ns pulse); resets internal timer on each transition to confirm µP liveness |
| 5 VCC | Main supply input | Powers device and supplies OUT during normal operation; monitored for reset generation and switchover control |
| 6 OUT | Power output | Sources from VCC (≤150mA) or BATT (≤40mA) depending on switchover state; powers SRAM/RTC directly |
| 7 BATT | Battery backup input | Accepts 2.0V–5.5V backup source; activates when VCC drops 20mV below VBATT to maintain memory retention |
| 8 CE OUT | Chip-enable output | Passes CE IN during normal operation; clamped low for 12µs after reset assertion to complete ongoing memory access |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer | 1.6s timeout with automatic edge-clearing - eliminates need for periodic software "kick" and reduces firmware overhead |
| Battery switchover hysteresis | 40mV (20mV up/down) - prevents oscillation during slow VCC decay and ensures clean transition between power sources |
| Chip-enable propagation delay | 1.5ns (typical) - preserves timing integrity for high-speed µP address/data buses accessing SRAM |
| VCC-to-RESET validity | Guaranteed down to 1.2V - enables robust reset assertion even during deep brownout or ultra-low-voltage battery operation |
| Backup-mode supply current | 3µA (max at -40°C to +85°C) - minimizes battery drain during extended backup periods in industrial logging devices |
Applications
| Industrial PLC I/O Module | Portable Medical Data Logger |
|---|---|
Use Scenario: Maintains SRAM contents and real-time clock during AC power loss or field wiring faults in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC brownout detection, watchdog-triggered reset, and seamless BATT-to-OUT switchover. Use Value: Prevents loss of process setpoints and timestamped sensor data during 100ms–5s utility outages using onboard coin cell. | Use Scenario: Powers flash memory and RTC during battery replacement or low-battery shutdown in handheld ECG recorders. IC Role / Device Role / Timing Role: Active-high RESET generator and CE gating controller ensuring atomic write completion before power collapse. Use Value: Guarantees zero-data-loss firmware updates and patient record commits via 150ms reset hold time and 1.5ns CE propagation. |
| POS Terminal with Backup RAM | Smart Energy Meter with Tamper Detection |
Use Scenario: Preserves transaction logs and cryptographic keys during mains dropout or surges in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors 3.3V logic rail and gates SRAM chip-enable to block writes during reset assertion. Use Value: Eliminates corrupted sales receipts by enforcing CE disable for 12µs after reset, matching µP bus cycle timing. | Use Scenario: Detects unauthorized enclosure opening via auxiliary switch on WDI, triggering immediate secure memory wipe and tamper flag. IC Role / Device Role / Timing Role: Watchdog input repurposed as hardware tamper interrupt; 1.6s timeout enforces rapid response before attacker gains physical access. Use Value: Meets IEC 62055-41 security requirements by converting mechanical intrusion into deterministic reset pulse within ≤2.25s. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA31+ | Same 3.08V reset threshold and 1.6s watchdog, but open-drain active-low RESET output instead of active-high | Requires pull-up resistor and level-shifting for µPs with active-low reset inputs; incompatible with wired-OR reset buses needing active-high assertion | Select when interfacing legacy µPs (e.g., older ARM7 or 8051 derivatives) that mandate active-low reset signaling |
| TPS3808G33DBVR | 3.3V reset threshold (±0.5%), no integrated watchdog, push-pull active-low RESET, 2.5µA quiescent current | Lacks battery switchover and CE gating; suitable only for basic power monitoring without memory backup or fault-tolerant write protection | Choose for cost-sensitive applications where watchdog and backup features are unnecessary and lowest standby current is critical |
Compared with MAX6366PKA31+, the MAX6366HKA31+ offers active-high RESET for direct compatibility with modern µPs requiring high-asserted reset, while TPS3808G33DBVR provides tighter threshold accuracy and lower ICC but omits battery management and memory protection - making it unsuitable for SRAM-retention-critical designs.
Availability
MAX6366HKA31+ is available at Aetrix Electronics and suitable for industrial PLCs, portable medical loggers, POS terminals, smart energy meters, and battery-backed RTU designs requiring stable component supply across extended product lifecycles.
Supply support for MAX6366HKA31+ 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 power, sensing, and connectivity in harsh environments.
The MAX6365–MAX6368 family targets µP-based systems needing integrated power supervision, battery switchover, and memory write protection - specifically engineered for reliability in portable, industrial, and metering equipment.
FAQ
What is the exact reset threshold voltage of the MAX6366HKA31+?
The MAX6366HKA31+ has a factory-trimmed reset threshold of 3.08V, with guaranteed minimum and maximum values of 3.00V and 3.15V respectively across -40°C to +85°C. This 3.08V threshold is optimized for monitoring standard 3.3V logic rails and detecting brownout conditions before microprocessor malfunction occurs. The MAX6366HKA31+ maintains this accuracy without external components or calibration.
Does the MAX6366HKA31+ support battery backup for SRAM retention?
Yes, the MAX6366HKA31+ provides full battery backup functionality. When VCC falls below the reset threshold and drops 20mV below VBATT, it automatically switches OUT from VCC to the backup battery source. In this mode, it delivers up to 40mA from the battery while consuming only 3µA of quiescent current, enabling multi-year SRAM/RTC retention on coin cells. The MAX6366HKA31+ also includes dedicated BATT and OUT pins with internal MOSFET switching and 40mV hysteresis to prevent oscillation.
How does the watchdog timer in the MAX6366HKA31+ operate?
The MAX6366HKA31+ watchdog timer has a fixed 1.6s timeout period (1.00s to 2.25s over temperature) and is cleared on every rising or falling edge at the WDI pin - no software configuration is needed. If WDI remains static longer than the timeout, a pulse is generated on the active-high RESET output for 150ms. The MAX6366HKA31+ watchdog requires no clock source or register writes, making it ideal for simple, reliable firmware hang detection in safety-critical embedded systems.
What is the function of the CE IN and CE OUT pins on the MAX6366HKA31+?
The CE IN and CE OUT pins implement hardware chip-enable gating to prevent memory corruption during power faults. During normal operation, CE IN passes directly to CE OUT with 1.5ns propagation delay and 20Ω on-resistance. When reset asserts, CE OUT is forced low for 12µs to complete pending SRAM accesses, then held high. This ensures atomic write operations and eliminates erroneous data writes to CMOS RAM - a core function of the MAX6366HKA31+ in µP systems with battery-backed memory.
Is the MAX6366HKA31+ pin-compatible with other MAX6366 variants?
Yes, all MAX6366 variants including MAX6366HKA31+ share identical 8-pin SOT23 pinout and electrical interface - only the reset threshold code (e.g., "31") and output type suffix ("H" = active-high open-drain) differ. This allows drop-in replacement across the MAX6366 family for design flexibility. The MAX6366HKA31+ pinout matches MAX6366LKA31+ and MAX6366PKA31+, differing only in RESET polarity and threshold trim, with no PCB layout changes required.
MAX6366HKA31+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- 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-23-8
MAX6366HKA31+ FAQ
1.How can I place an order for MAX6366HKA31+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366HKA31+ 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 MAX6366HKA31+ reliable?
The price and inventory of MAX6366HKA31+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366HKA31+ is usually 5 days.
3.What payment methods are accepted for MAX6366HKA31+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366HKA31+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366HKA31+?
MAX6366HKA31+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366HKA31+ 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 MAX6366HKA31+?
For technical support, including MAX6366HKA31+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366HKA31+ requirements.
6.How does Aetrix verify that MAX6366HKA31+ is sourced from the original manufacturer or authorized distributors?
All MAX6366HKA31+ 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 MAX6366HKA31+ meets industry standards.
7.What is the process for return or replacement of MAX6366HKA31+?
All MAX6366HKA31+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366HKA31+, 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 MAX6366HKA31+ part is unused and in its original packaging.
Return procedure for MAX6366HKA31+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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