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Analog Devices Inc./Maxim Integrated MAX6366PKA31+T
- Part No.:
- MAX6366PKA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366PKA31+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,340
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Product details
Overview
MAX6366PKA31+T from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors VCC (1.2V–5.5V), asserts active-low open-drain RESET on power-up/down/brownout or watchdog timeout, provides 3.08V reset threshold (±0.07V), delivers 150ms minimum reset timeout, and supports CMOS RAM backup via OUT switching between VCC and BATT. Used in portable POS terminals and industrial controllers requiring reliable brownout recovery.
For engineers reviewing the MAX6366PKA31+T datasheet, MAX6366PKA31+T pinout, MAX6366PKA31+T application, or MAX6366PKA31+T equivalent, key selection criteria include its 1.6s watchdog timeout, 3.08V factory-trimmed reset threshold, 10µA quiescent current, open-drain active-low RESET output, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6366PKA31+T integrates a precision voltage monitor, 1.6s watchdog timer with edge-triggered WDI input, bidirectional VCC/BATT switchover logic with 40mV hysteresis, and CE IN-to-CE OUT transmission gate with 1.5ns propagation delay. Its internal 1.235V reference enables accurate threshold generation, and the open-drain RESET output operates down to 1.2V supply.
Reset assertion occurs on VCC falling below 3.08V, manual MR assertion (not applicable-this is MAX6366, not MAX6365), or WDI timeout; reset remains asserted for ≥150ms after VCC rises above threshold or WDI edge detection clears the timer. Battery switchover activates only when VCC < VTH and VCC < VBATT −20mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (factory-trimmed, ±0.07V over -40°C to +85°C) - ensures reliable detection of 3.3V supply brownout before system instability. |
| Watchdog Timeout | 1.6s (typical, 1.0–2.25s over temp) - provides sufficient margin for firmware execution loops without false triggers. |
| Quiescent Current | 10µA (max at +25°C, VCC = 5.5V) - enables multi-year operation in battery-backed SRAM retention. |
| Reset Timeout Period | 150ms (min) - guarantees µP reset hold time exceeds typical processor power-up stabilization requirements. |
| Supply Range | 1.2V to 5.5V (VCC or VBATT) - supports direct interface with 1.8V/2.5V/3.3V/5V logic and backup cells. |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and level-shifting across mixed-voltage domains. |
| Battery Switchover | VCC-to-BATT transition at VCC < VBATT −20mV - prevents oscillation during slow VCC decay with 40mV hysteresis. |
Pinout & Package
MAX6366PKA31+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead(Pb)-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC brownout, watchdog timeout, or power failure; requires external pull-up for logic-level compatibility. |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; held low during reset to prevent write corruption; internal 20kΩ pullup if unused. |
| 3 GND | Ground reference | Primary return path for all analog and digital functions; must be low-impedance connection to system ground plane. |
| 4 WDI | Watchdog input | Edge-sensitive input (rising/falling/100ns pulse); resets internal timer on each transition; no internal pullup/pulldown. |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation; monitored for reset generation. |
| 6 OUT | Switched output | Sources from VCC when active; switches to BATT during backup mode; drives SRAM VDD with up to 150mA (VCC) or 20mA (BATT). |
| 7 BATT | Backup battery input | Accepts 2.0V–5.5V; supplies OUT when VCC fails; draws ≤1µA standby current (VBATT = 2.8V, VCC = 0V). |
| 8 CE OUT | Chip-enable output | Gated version of CE IN; goes high only when CE IN is high and reset is deasserted; 1.5ns propagation delay enables use with fast µPs. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated watchdog timer | 1.6s timeout with edge-triggered WDI input - eliminates need for external timing components and reduces firmware complexity. |
| Factory-trimmed reset threshold | 3.08V ±0.07V - eliminates external resistor divider calibration and improves system-level voltage monitoring accuracy. |
| Chip-enable gating with 1.5ns delay | Prevents SRAM write corruption during power transitions by disabling CE path within 1.5ns of reset assertion. |
| Ultra-low quiescent current | 10µA max - extends battery life in always-on backup applications such as real-time clocks and configuration memory. |
| VCC/BATT switchover with hysteresis | 40mV hysteresis prevents chattering during slow VCC decay - ensures clean, single-event transition to backup power. |
Applications
| Portable POS Terminals | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-backed transaction logging during AC power loss in retail payment terminals. IC Role / Device Role / Timing Role: Supervisory circuit providing VCC brownout detection, automatic BATT switchover to SRAM, and watchdog supervision of main µP firmware. Use Value: Guarantees 150ms+ reset hold time and 1.6s watchdog timeout to complete critical EEPROM writes before full shutdown. |
Use Scenario: Maintaining I/O state and program counter integrity during voltage sags in factory-floor programmable logic controllers. IC Role / Device Role / Timing Role: Reset generator and CE gate controller ensuring deterministic µP restart and preventing corrupted I/O register writes during brownout. Use Value: 3.08V threshold matches 3.3V I/O rail tolerance; 10µA ICC enables >5-year coin-cell backup life for nonvolatile configuration storage. |
| Medical Handheld Monitors | Smart Energy Meters |
|
Use Scenario: Preserving patient measurement history and calibration data during intermittent battery replacement in portable ECG devices. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3V supply and triggers watchdog reset if firmware hangs during sensor acquisition. Use Value: Open-drain RESET allows safe level-shifting to 1.8V µP reset input; 1.2V minimum operating voltage supports ultra-low-power sleep modes. |
Use Scenario: Securing meter firmware and tariff tables during grid voltage fluctuations in residential smart electricity meters. IC Role / Device Role / Timing Role: Power supervisor with CE gating to lock flash memory writes during undervoltage events and prevent partial page corruption. Use Value: 1.5ns CE IN→CE OUT delay ensures compatibility with 50MHz SPI flash interfaces; 40mV switchover hysteresis rejects line noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366HKA31+T | Same 3.08V reset threshold and watchdog, but push-pull active-high RESET output instead of open-drain active-low. | Requires redesign of reset net pull-up/pull-down and may conflict with existing µP reset polarity requirements. | Select only if system requires active-high reset signaling and no wired-OR capability is needed. |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 200ms reset timeout, no watchdog or battery switchover; 2.5µA IQ; SOT23-6 package. | Lacks battery backup, CE gating, and watchdog - suitable only for basic reset-only applications without data retention needs. | Choose when cost and footprint are prioritized over multifunction integration and backup capability. |
Compared with MAX6366PKA31+T, MAX6366HKA31+T offers identical supervision functionality but incompatible reset polarity and drive strength, while TPS3808G33DBVR reduces feature set to basic reset generation-making it unsuitable for battery-backed or watchdog-critical designs.
Availability
MAX6366PKA31+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLC controllers, medical handheld monitors, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6366PKA31+T 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 management, sensing, and connectivity in demanding industrial and portable applications.
The MAX6365–MAX6368 family was engineered specifically for µP systems needing integrated power supervision, battery backup, and memory write protection in ultra-small footprints-targeting space-constrained, battery-sensitive equipment.
FAQ
What is the exact reset threshold voltage of MAX6366PKA31+T?
The MAX6366PKA31+T features a factory-trimmed reset threshold of 3.08V, with guaranteed limits of 3.00V (min) and 3.15V (max) across the full -40°C to +85°C temperature range. This value is laser-trimmed during production and does not require external resistors or calibration. The threshold applies to VCC monitoring only and is independent of battery voltage or watchdog operation.
Does MAX6366PKA31+T support battery backup functionality?
Yes, MAX6366PKA31+T fully supports battery backup: when VCC falls below both the 3.08V reset threshold and VBATT −20mV, the internal MOSFET automatically switches OUT from VCC to BATT. In this mode, it supplies up to 20mA from the battery while drawing only ≤1µA quiescent current (VBATT = 2.8V, VCC = 0V), enabling multi-year SRAM retention.
What is the watchdog timeout period for MAX6366PKA31+T?
The MAX6366PKA31+T watchdog timeout period is 1.6s typical, with a guaranteed range of 1.00s to 2.25s over temperature. It is triggered when the WDI input remains static (high or low) beyond this interval. Each rising or falling edge on WDI resets the timer, and reset pulses last for the full 150ms minimum timeout period.
What package type and pin count does MAX6366PKA31+T use?
MAX6366PKA31+T uses an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant and lead(Pb)-free. Pinout is standardized across the MAX6365–MAX6368 family: pins 1–8 correspond to RESET, CE IN, GND, WDI, VCC, OUT, BATT, and CE OUT respectively - verified per Maxim's official pin configuration diagram for MAX6366.
Can MAX6366PKA31+T drive a 3.3V microprocessor reset input directly?
Yes, MAX6366PKA31+T can drive a 3.3V µP reset input, but requires an external pull-up resistor (typically 10kΩ to 3.3V) since its RESET output is open-drain active-low. When asserted, RESET sinks ≥1.6mA at 0.3V (VCC > 2.1V); when deasserted, it presents high impedance, allowing the pull-up to establish valid logic-high levels compatible with standard 3.3V CMOS inputs.
MAX6366PKA31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- 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-23-8
MAX6366PKA31+T FAQ
1.How can I place an order for MAX6366PKA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366PKA31+T 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 MAX6366PKA31+T reliable?
The price and inventory of MAX6366PKA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366PKA31+T is usually 5 days.
3.What payment methods are accepted for MAX6366PKA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366PKA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366PKA31+T?
MAX6366PKA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366PKA31+T 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 MAX6366PKA31+T?
For technical support, including MAX6366PKA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366PKA31+T requirements.
6.How does Aetrix verify that MAX6366PKA31+T is sourced from the original manufacturer or authorized distributors?
All MAX6366PKA31+T 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 MAX6366PKA31+T meets industry standards.
7.What is the process for return or replacement of MAX6366PKA31+T?
All MAX6366PKA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366PKA31+T, 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 MAX6366PKA31+T part is unused and in its original packaging.
Return procedure for MAX6366PKA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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