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Analog Devices Inc./Maxim Integrated MAX6366HKA46+
- Part No.:
- MAX6366HKA46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366HKA46+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,064
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Product details
Overview
The MAX6366HKA46+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors +4.63V supply voltage (factory preset), asserts active-high open-drain RESET on VCC brownout or watchdog timeout, delivers ≤10µA quiescent current, and operates down to 1.2V supply-enabling reliable power management in portable medical monitors and industrial data loggers.
For engineers reviewing the MAX6366HKA46+ datasheet, MAX6366HKA46+ pinout, MAX6366HKA46+ application, or MAX6366HKA46+ equivalent, key selection criteria include its 4.63V reset threshold, 1.6s watchdog timeout, 150ms minimum reset pulse width, open-drain active-high RESET output, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
This device integrates four core functions: (1) precision VCC monitoring with ±1.5% threshold accuracy over temperature; (2) automatic VCC-to-battery switchover with 40mV hysteresis to prevent oscillation during slow VCC decay; (3) 1.5ns CE IN–CE OUT propagation delay for high-speed memory write protection; and (4) a dedicated WDI input that triggers a 150–280ms RESET pulse upon 1.00–2.25s timeout.
The MAX6366HKA46+ uses an internal MOSFET for battery switchover (RON ≤ 4.6Ω at 2.38V VCC), supports VCC and VBATT operation down to 1.2V, and guarantees RESET/RESET validity across the full 1.2–5.5V supply range-making it suitable for dual-supply failover in battery-backed SRAM and RTC subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (factory preset, ±1.5% over -40°C to +85°C) - ensures reliable detection of +5V rail collapse before µP malfunction |
| Watchdog Timeout | 1.6s (typical, 1.00–2.25s min/max) - provides sufficient margin for firmware execution loops without false triggering |
| Reset Pulse Width | 150ms minimum - guarantees µP initialization completes before release |
| Supply Current | 15µA typical at 5.5V - enables multi-year battery life in always-on backup mode |
| Operating Voltage | 1.2V to 5.5V - supports direct interface with 1.8V/2.5V/3.3V/5V logic and battery inputs as low as 2.25V |
| Output Type | Open-drain active-high RESET - allows wired-OR configuration and level-shifting with external pull-up |
| Package | 8-pin SOT23 - footprint-compatible with industry-standard space-constrained PCB layouts |
Pinout & Package
MAX6366HKA46+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density µP system boards requiring minimal board area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-high open-drain reset output | Asserts high during VCC brownout, watchdog timeout, or MR assertion; requires external pull-down for active-low µP interface |
| 2: CE IN | Chip-enable input | Directly gates CE signal to SRAM; low state disables write access during power faults |
| 3: GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4: WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset internal 1.6s timer; static high/low >1.6s triggers reset pulse |
| 5: VCC | Main supply input | Primary power source (1.2–5.5V); monitored for reset generation and used to drive OUT when above threshold |
| 6: OUT | Switched output | Sources from VCC normally; switches to BATT during brownout (≥20mV hysteresis) to sustain SRAM/RTC power |
| 7: BATT | Battery backup input | Accepts 2.25–5.5V backup source; supplies OUT when VCC fails; draws <1µA standby current |
| 8: CE OUT | Chip-enable output | Passes CE IN when reset inactive; held low for 12µs after reset assertion to complete ongoing memory cycles |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer | 1.6s timeout with edge-triggered reset clearance - prevents runaway code without software overhead |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance - preserves timing integrity for fast µPs and DSPs |
| Battery switchover | 40mV hysteresis and <1µA BATT standby current - eliminates chatter during slow VCC decay and extends battery life |
| Low-voltage operation | 1.2V guaranteed RESET/RESET validity - supports operation with depleted batteries or ultra-low-VDD systems |
| Reset threshold accuracy | ±1.5% over -40°C to +85°C - reduces need for external calibration in industrial environments |
Applications
| Portable Medical Monitors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous ECG/SpO₂ monitoring with nonvolatile memory storage during AC power loss. IC Role / Device Role / Timing Role: Supervises main 5V rail, triggers watchdog if firmware hangs, and switches SRAM to coin-cell backup within 20µs of VCC drop. Use Value: Prevents data loss during 100ms brownouts and enables >5-year battery backup via 10µA ICC and sub-µA IBACK. | Use Scenario: Remote environmental sensor node logging temperature/humidity to EEPROM during grid outage. IC Role / Device Role / Timing Role: Monitors 3.3V MCU supply, gates CE to block corrupted writes during brownout, and asserts RESET to halt logging until stable power returns. Use Value: Guarantees 150ms reset hold time and 1.5ns CE gating to protect against partial writes under marginal VCC conditions. |
| POS Terminal Memory Backup | Smart Meter Real-Time Clock |
Use Scenario: Preserving transaction buffer and configuration settings during brief utility interruptions. IC Role / Device Role / Timing Role: Uses WDI to verify host processor liveness; switches SRAM to backup battery when VCC falls below 4.63V. Use Value: Eliminates need for external MOSFET and discrete reset IC, reducing BOM count by 3 components and PCB area by 25mm². | Use Scenario: Maintaining accurate timekeeping and tamper logs during extended mains failure. IC Role / Device Role / Timing Role: Provides regulated 3.0V output to RTC via BATT switchover and asserts RESET to synchronize clock initialization on power restore. Use Value: Achieves <1ppm timing drift during backup mode using factory-trimmed 4.63V threshold and 40mV hysteresis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366HKA44+ | 4.38V reset threshold (vs. 4.63V); otherwise identical pinout, timing, and features | Suitable for +4.5V nominal rails where tighter margin below 4.63V is required | Select when system VCC tolerance demands earlier reset assertion before 4.63V collapse |
| TPS3808G33DBVR | 3.3V fixed reset threshold; no watchdog or battery switchover; SOT23-6 package | Limited to basic reset supervision without memory protection or backup power control | Choose only for cost-sensitive designs omitting watchdog and battery features |
Compared with MAX6366HKA44+, the MAX6366HKA46+ provides higher reset threshold headroom for +5V systems; versus TPS3808G33DBVR, it adds critical watchdog, CE gating, and battery switchover-justifying its use in safety-critical, battery-backed µP applications.
Availability
MAX6366HKA46+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, and smart meter real-time clocks requiring stable component supply across extended product lifecycles.
Supply support for MAX6366HKA46+ 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 demanding industrial and medical applications.
The MAX6365–MAX6368 family was engineered specifically for µP systems needing integrated reset supervision, battery switchover, and memory write protection in ultra-small packages-targeting portable, battery-powered, and high-reliability embedded equipment.
FAQ
What is the exact reset threshold voltage of the MAX6366HKA46+?
The MAX6366HKA46+ has a factory-preset reset threshold of 4.63V (typical), with a guaranteed range of 4.50V to 4.75V over -40°C to +85°C. This value is laser-trimmed during production and does not require external resistor networks. The "46" suffix in MAX6366HKA46+ explicitly denotes this 4.63V threshold per Maxim's ordering nomenclature.
Does the MAX6366HKA46+ support both VCC and battery backup power sources simultaneously?
Yes, the MAX6366HKA46+ supports dual-source operation: VCC powers OUT during normal operation, and automatically switches to BATT when VCC falls below the 4.63V threshold and remains at least 20mV below VBATT. The device maintains seamless switchover with 40mV hysteresis and sustains SRAM/RTC operation with <1µA battery standby current-verified in the Electrical Characteristics table under IBATT and IBACK parameters.
What is the function of the WDI pin on the MAX6366HKA46+?
The WDI (Watchdog Input) pin on the MAX6366HKA46+ resets the internal 1.6s watchdog timer on every rising or falling edge. If WDI remains static (high or low) longer than the timeout period, the device asserts a 150–280ms active-high RESET pulse. This behavior is confirmed in the Pin Description section and Electrical Characteristics table (tWD = 1.00–2.25s), enabling robust firmware hang detection without additional timers.
Can the MAX6366HKA46+ drive standard CMOS RAM chip-enable signals directly?
Yes, the MAX6366HKA46+ drives CE OUT with 1.5ns propagation delay and 20–100Ω on-resistance, supporting direct connection to standard CMOS RAM. When CE IN is low and reset is inactive, CE OUT follows with minimal delay; during reset assertion, CE OUT is held low for 12µs to complete pending memory cycles-details verified in the Chip-Enable Signal Gating section and Electrical Characteristics (CE IN to CE OUT Propagation Delay).
Is the MAX6366HKA46+ compatible with 1.8V microprocessors?
Yes, the MAX6366HKA46+ operates with VCC as low as 1.2V and guarantees RESET/RESET output validity down to 1.2V, making it fully compatible with 1.8V µPs. Its open-drain active-high RESET output can interface directly via pull-up to 1.8V, while CE IN/CE OUT tolerate 1.2V–5.5V logic levels-confirmed in Absolute Maximum Ratings and Electrical Characteristics (RESET Output Voltage VOH specifications).
MAX6366HKA46+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6366HKA46+ FAQ
1.How can I place an order for MAX6366HKA46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366HKA46+ 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 MAX6366HKA46+ reliable?
The price and inventory of MAX6366HKA46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366HKA46+ is usually 5 days.
3.What payment methods are accepted for MAX6366HKA46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366HKA46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366HKA46+?
MAX6366HKA46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366HKA46+ 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 MAX6366HKA46+?
For technical support, including MAX6366HKA46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366HKA46+ requirements.
6.How does Aetrix verify that MAX6366HKA46+ is sourced from the original manufacturer or authorized distributors?
All MAX6366HKA46+ 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 MAX6366HKA46+ meets industry standards.
7.What is the process for return or replacement of MAX6366HKA46+?
All MAX6366HKA46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366HKA46+, 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 MAX6366HKA46+ part is unused and in its original packaging.
Return procedure for MAX6366HKA46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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