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Analog Devices Inc./Maxim Integrated MAX6366PKA44
- Part No.:
- MAX6366PKA44
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366PKA44.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:978
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Product details
Overview
MAX6366PKA44 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 (1.2V–5.5V), asserts active-low open-drain RESET on power-up/down/brownout or watchdog timeout, provides 4.38V factory-set reset threshold, and supports CMOS RAM backup via OUT switching between VCC and BATT. Used in portable industrial controllers requiring reliable brownout recovery and memory write protection.
For engineers reviewing the MAX6366PKA44 datasheet, MAX6366PKA44 pinout, MAX6366PKA44 application, or MAX6366PKA44 equivalent, key selection criteria include its 1.6s watchdog timeout, 150ms minimum reset timeout, 10µA quiescent current, 8-pin SOT23 package, and compatibility with +3.3V/+5.0V systems requiring fail-safe memory retention during main supply failure.
Technical Context
The MAX6366PKA44 integrates a precision voltage monitor with 4.38V ±0.13V reset threshold, a 1.6s watchdog timer that triggers RESET pulses on WDI inactivity, and a bidirectional VCC/BATT switchover switch with 40mV hysteresis. Its CE IN/CE OUT transmission gate enables chip-enable signal gating with 1.5ns propagation delay and 20–100Ω on-resistance to prevent SRAM corruption during power faults.
RESET output is open-drain active-low, guaranteed functional down to 1.2V VCC or VBATT, and features 150ms minimum assertion time after VCC recovery. The device operates across –40°C to +85°C, draws only 10µA typical supply current, and includes internal 20kΩ MR pullup (though unused here as this is MAX6366 variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (factory preset, ±0.13V tolerance) - ensures reliable detection of +5.0V supply brownout before system instability |
| Watchdog Timeout | 1.6s (typical) - provides sufficient margin for firmware execution loops while detecting hangs in real-time control tasks |
| Reset Timeout Period | 150ms min - guarantees µP initialization completes before release from reset after VCC recovery |
| Supply Current | 10µA (typ, VCC = 5.5V) - enables multi-year battery life in always-on portable monitoring equipment |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with Li-ion, coin-cell, and regulated +3.3V/+5.0V rails without external level shifting |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration with other reset sources and flexible pull-up voltage selection |
| Package | 8-pin SOT23 - enables high-density PCB layout in space-constrained handheld and IoT edge devices |
Pinout & Package
MAX6366PKA44 is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for compact portable electronics. Pin assignments are validated per Maxim's official pin configuration diagram for MAX6366.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low open-drain reset output | Asserts low during VCC brownout, watchdog timeout, or power-down; requires external pull-up for logic-level compatibility |
| 2: CE IN | Chip-enable input | Controls gating path to CE OUT; tied to GND or OUT when unused to disable CE function |
| 3: GND | Ground reference | Primary return path for all internal circuits and output loads; must be low-impedance for noise immunity |
| 4: WDI | Watchdog input | Edge-sensitive trigger (rising/falling ≥100ns); resets internal timer on each transition; left floating to disable watchdog |
| 5: VCC | Main supply input | Powers device and supplies OUT during normal operation; monitored for reset threshold violation |
| 6: OUT | Switched output | Sources from VCC normally; switches to BATT during brownout (if VBATT > VCC + 20mV) to sustain SRAM/RTC |
| 7: BATT | Battery backup input | Provides backup power source; must exceed VCC by ≥20mV to engage switchover; draws <1µA standby current |
| 8: CE OUT | Chip-enable output | Passes CE IN signal when reset inactive; held low for 12µs if CE IN low during reset to complete memory access |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables autonomous firmware hang detection without CPU intervention, critical for unattended industrial sensors |
| On-board chip-enable gating (1.5ns delay) | Prevents erroneous SRAM writes during power transitions by disabling CE path within nanoseconds of reset assertion |
| VCC/BATT switchover with 40mV hysteresis | Eliminates oscillatory switching during slow VCC decay, ensuring clean, glitch-free memory backup activation |
| 10µA quiescent current at 5.5V | Extends battery life in always-on backup mode-e.g., 10-year operation on CR2032 (220mAh) with 1µA average load |
| Guaranteed RESET operation down to 1.2V | Supports ultra-low-voltage operation in energy-harvesting systems where VCC may dip below 1.8V during peak load |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous vital-sign logging in battery-powered ECG device with nonvolatile SRAM storage. IC Role / Device Role / Timing Role: Supervises main 3.3V rail, triggers watchdog reset on firmware stall, and switches SRAM power to coin-cell backup during AC adapter loss. Use Value: Prevents data loss during 10-second brownout events and ensures deterministic recovery from software lockups without manual intervention. | Use Scenario: Remote analog input module operating in factory environments with unstable 24VDC field power. IC Role / Device Role / Timing Role: Monitors local 5.0V regulation, gates CE to isolated ADC memory during brownout, and asserts reset to halt corrupted sampling sequences. Use Value: Eliminates spurious sensor readings caused by partial power collapse, reducing false alarms in safety-critical process control. |
| Smart Energy Meter | POS Terminal with RTC Backup |
Use Scenario: Revenue-grade electricity meter with tamper-resistant flash and real-time clock, deployed on utility grids with frequent sags. IC Role / Device Role / Timing Role: Provides 4.38V reset threshold aligned to 5V regulator dropout, enables battery-backed RTC/SRAM holdover, and uses WDI to verify metering firmware liveness. Use Value: Maintains accurate timekeeping and billing data integrity across 200ms grid interruptions, meeting ANSI C12.1 compliance requirements. | Use Scenario: Retail point-of-sale terminal with battery-backed real-time clock and transaction log buffer. IC Role / Device Role / Timing Role: Switches SRAM power from 3.3V rail to backup cell upon main supply failure, gates CE to prevent partial write corruption, and asserts reset to freeze UI state. Use Value: Guarantees atomic transaction rollback and preserves last-sale timestamp even during sudden AC outage, satisfying PCI-DSS audit trails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366HKA44 | Same 4.38V reset threshold and watchdog, but push-pull active-high RESET output instead of open-drain active-low | Requires redesign of reset net termination and logic polarity handling; incompatible with existing wired-OR reset buses | Select only if system requires active-high reset signaling and no shared reset bus |
| TPS3808G33 | 3.3V fixed reset threshold, no watchdog timer, no battery switchover or CE gating; 1.8V–6.5V VCC range | Lacks memory protection and autonomous fault recovery; suitable only for basic power monitoring without backup or watchdog needs | Choose when cost sensitivity outweighs need for battery backup, watchdog, or SRAM write protection |
Compared with MAX6366HKA44, MAX6366PKA44 offers compatible timing and threshold but enables flexible reset bus architecture via open-drain output; versus TPS3808G33, it delivers integrated reliability functions-watchdog, switchover, and CE gating-that eliminate discrete component count and board area in mission-critical embedded systems.
Availability
MAX6366PKA44 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and POS terminals requiring stable component supply with long-term lifecycle support.
Supply support for MAX6366PKA44 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, automotive, and computing applications.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated power supervision, battery backup, and memory protection-designed specifically for portable, battery-powered, and fail-safe embedded control.
FAQ
What is the factory-set reset threshold voltage for MAX6366PKA44?
The MAX6366PKA44 has a factory-set reset threshold of 4.38V (typical), with a guaranteed range of 4.25V to 4.50V across temperature and supply conditions. This value is laser-trimmed during production and does not require external resistor networks. The threshold ensures robust detection of brownout on +5.0V rails while avoiding false triggers from nominal ripple. MAX6366PKA44 maintains this specification over –40°C to +85°C ambient operation.
Does MAX6366PKA44 support battery backup functionality, and how does switchover work?
Yes, MAX6366PKA44 supports automatic battery backup via its VCC-to-BATT switchover circuit. When VCC falls below the 4.38V reset threshold *and* drops at least 20mV below VBATT, the internal MOSFET connects BATT to OUT to sustain SRAM or RTC. Switchover includes 40mV hysteresis to prevent oscillation during slow VCC decay. In backup mode, MAX6366PKA44 draws only 3µA from the battery (VBATT = 2.8V), enabling multi-year operation on standard coin cells.
What is the watchdog timeout period of MAX6366PKA44, and how is it triggered?
The MAX6366PKA44 watchdog timeout period is 1.6s (typical), with a guaranteed range of 1.00s to 2.25s across temperature and voltage. It is triggered when the WDI pin remains static (high or low) longer than this interval-requiring a rising or falling edge at least every 1.6s to reset the timer. Each edge clears the watchdog; absence causes a RESET pulse lasting ≥150ms. MAX6366PKA44's WDI accepts TTL/CMOS levels and tolerates 100ns minimum pulse width.
Can MAX6366PKA44 be used without a backup battery?
Yes, MAX6366PKA44 operates fully without a backup battery. In this configuration, connect BATT to GND and tie OUT directly to VCC. All supervision functions-including reset generation, watchdog monitoring, and CE gating-remain active. The device draws only 10µA quiescent current and asserts RESET correctly during VCC transients. MAX6366PKA44's CE IN/CE OUT path continues to protect memory writes during power faults, making it suitable for cost-sensitive applications where battery backup is optional.
What package type and pin count does MAX6366PKA44 use?
MAX6366PKA44 uses an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm body size), with standardized pinout matching Maxim's MAX6366 series. This surface-mount package supports reflow soldering and is compatible with automated PCB assembly. Pin 1 is RESET (open-drain active-low), Pin 4 is WDI, Pin 6 is OUT, and Pin 7 is BATT-enabling compact integration into space-limited portable electronics. MAX6366PKA44's SOT23 footprint is identical across all MAX6365–MAX6368 variants.
MAX6366PKA44 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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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-23-8
MAX6366PKA44 FAQ
1.How can I place an order for MAX6366PKA44 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366PKA44 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 MAX6366PKA44 reliable?
The price and inventory of MAX6366PKA44 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366PKA44 is usually 5 days.
3.What payment methods are accepted for MAX6366PKA44?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366PKA44 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366PKA44?
MAX6366PKA44 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366PKA44 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 MAX6366PKA44?
For technical support, including MAX6366PKA44 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366PKA44 requirements.
6.How does Aetrix verify that MAX6366PKA44 is sourced from the original manufacturer or authorized distributors?
All MAX6366PKA44 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 MAX6366PKA44 meets industry standards.
7.What is the process for return or replacement of MAX6366PKA44?
All MAX6366PKA44 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366PKA44, 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 MAX6366PKA44 part is unused and in its original packaging.
Return procedure for MAX6366PKA44:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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