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Analog Devices Inc./Maxim Integrated MAX6366PKA46+
- Part No.:
- MAX6366PKA46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366PKA46+.pdf
- Description:
- MAX6366 LOW-POWER MICROPROCESSO
- Quantity:
- Payment:
- Shipping:
Inventory:1,738
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Product details
Overview
The MAX6366PKA46+ 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 = 4.63V), asserts an open-drain active-low RESET output during power-up/down/brownout, provides 1.6s watchdog timeout, and switches OUT between VCC and backup battery with <40mV hysteresis-used in portable POS terminals and industrial controllers requiring reliable power-fail response.
For engineers reviewing the MAX6366PKA46+ datasheet, MAX6366PKA46+ pinout, MAX6366PKA46+ application, or MAX6366PKA46+ equivalent, key selection criteria include its 4.63V factory-trimmed reset threshold, 1.6s watchdog timeout, 10µA quiescent current, open-drain active-low RESET output, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6366PKA46+ implements a precision voltage monitor with ±1.5% threshold accuracy over temperature, a monostable watchdog timer triggered by WDI edge transitions, and a bidirectional analog switch for VCC/BATT switchover with 4.6Ω typical on-resistance at 2.38V. Its CE IN-to-CE OUT transmission gate delivers 1.5ns propagation delay under 50Ω/50pF conditions.
Reset assertion is synchronized to VCC falling below 4.63V, MR (not present), or WDI timeout; RESET remains asserted for ≥150ms after recovery. The device guarantees RESET validity down to 1.2V VCC or VBATT and supports battery-backup operation with ≤3µA IBACK at -40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±1.5% - factory-trimmed for precise +5V supply monitoring without external resistors |
| Watchdog Timeout | 1.6s typ - ensures µP firmware hangs are detected within defined time window |
| Quiescent Current | 10µA max at VCC = 5.5V - enables multi-year battery life in backup mode |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level-shifting with external pull-up |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V logic domains |
| Reset Timeout Period | 150ms min - meets JEDEC JESD79-4 requirement for DDR memory initialization hold time |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC decay near threshold |
Pinout & Package
MAX6366PKA46+ uses an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm) with gull-wing leads, RoHS-compliant lead-free finish (+ suffix), and thermal pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low reset output | Asserts low during VCC < 4.63V, WDI timeout, or brownout; requires external pull-up for logic-high state |
| 2: CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write path during reset to prevent data corruption |
| 3: GND | Ground reference | Common return for all internal circuits; must be low-impedance connection to system ground plane |
| 4: WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset 1.6s timer; static high/low >1.6s triggers reset pulse |
| 5: VCC | Main supply input | Primary power source (1.2–5.5V); powers internal circuitry and supplies OUT when above reset threshold |
| 6: OUT | Switched output | Sources from VCC normally; switches to BATT during backup mode; drives SRAM VDD with up to 150mA |
| 7: BATT | Backup battery input | Accepts 2.0–5.5V backup source; activates switchover when VCC < VTH and VCC < VBATT − 20mV |
| 8: CE OUT | Chip-enable output | Gated CE signal to memory; low only when CE IN = low and reset not asserted; 1.5ns propagation delay |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables firmware hang detection without external timing components or µP overhead |
| Factory-trimmed 4.63V reset threshold | Eliminates need for external resistor divider; reduces BOM count and layout area |
| VCC-to-BATT switchover with 40mV hysteresis | Prevents chattering during slow power decay; ensures clean transition for SRAM retention |
| 1.5ns CE IN-to-CE OUT propagation delay | Supports high-speed µP bus timing without adding wait states or degrading memory access performance |
| 10µA supply current at 5.5V | Extends battery life in always-on backup applications such as real-time clocks and metering systems |
Applications
| POS Terminal Power Management | Industrial PLC Controller Supervision |
|---|---|
Use Scenario: Battery-backed memory retention during AC mains failure in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC providing VCC monitoring, automatic battery switchover, and watchdog-triggered reset to recover hung transaction processing. Use Value: Prevents loss of sales transaction logs and maintains SRAM integrity for 72+ hours on coin cell using <3µA backup current. | Use Scenario: Reliable reset generation and memory protection in programmable logic controller I/O modules exposed to 24V DC rail transients. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during brownout, gating CE to prevent corrupted I/O register writes, and detecting firmware lockups via WDI. Use Value: Guarantees deterministic startup and fault recovery with 150ms minimum reset pulse width meeting IEC 61131-2 immunity requirements. |
| Portable Medical Monitor Data Logging | Set-Top Box Firmware Recovery |
Use Scenario: Preserving patient vital sign history in battery-powered ECG monitors during unexpected power loss. IC Role / Device Role / Timing Role: Dual-role device: monitors main 3.3V supply and triggers watchdog reset if sensor acquisition loop stalls. Use Value: Enables continuous logging with <10µA quiescent draw and eliminates need for external reset IC + watchdog IC combination. | Use Scenario: Recovering from corrupted firmware updates or bootloader hangs in consumer set-top boxes. IC Role / Device Role / Timing Role: Watchdog supervisor asserting open-drain RESET to force hardware reboot when software fails to toggle WDI. Use Value: Reduces field returns due to unresponsive UI by ensuring automatic recovery within 1.6s + 150ms, independent of µP state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366HKA46+ | Same 4.63V threshold and watchdog, but push-pull active-high RESET output instead of open-drain active-low | Requires redesign of RESET pull-up network and may conflict with existing µP reset polarity logic | Select only if system requires active-high reset assertion without external inverter |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no watchdog timer, 350ms reset timeout, SOT23-6 package | Lacks battery switchover, CE gating, and watchdog-suitable only for basic reset-only applications | Choose when cost sensitivity outweighs need for backup control and watchdog functionality |
Compared with MAX6366HKA46+, the MAX6366PKA46+ provides compatible supervision with open-drain flexibility for mixed-voltage systems; versus TPS3808G33DBVR, it adds critical battery backup, watchdog, and memory write protection-justifying its use where system reliability beyond simple reset is required.
Availability
MAX6366PKA46+ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, retail POS terminals, and set-top box firmware recovery systems requiring stable component supply across extended production lifecycles.
Supply support for MAX6366PKA46+ 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 was engineered specifically for µP-based systems needing integrated power monitoring, battery backup, and memory write protection in ultra-small footprints-targeting portable, battery-critical, and high-reliability embedded equipment.
FAQ
What is the exact reset threshold voltage for MAX6366PKA46+?
The MAX6366PKA46+ has a factory-trimmed reset threshold of 4.63V with ±1.5% accuracy over -40°C to +85°C. This value is specified in the Reset Threshold Ranges table and confirmed in Electrical Characteristics, where VTH = 4.50V (min), 4.63V (typ), 4.75V (max). The '46' suffix in the part number directly encodes this 4.63V nominal threshold.
Does MAX6366PKA46+ support battery-backup operation with lithium coin cells?
Yes, MAX6366PKA46+ supports battery-backup operation with lithium coin cells (e.g., CR2032). Its VBATT input accepts 2.0V to 5.5V, and it draws only ≤3µA in backup mode (IBACK) at -40°C to +85°C. The internal MOSFET switchover ensures clean transition when VCC falls below 4.63V and VBATT exceeds VCC by 20mV, preserving SRAM data for years on a single coin cell.
What is the function of the WDI pin on MAX6366PKA46+?
The WDI (Watchdog Input) pin on MAX6366PKA46+ resets the internal 1.6s watchdog timer on every rising or falling edge. If WDI remains static (high or low) longer than 1.6s, the timer expires and triggers a RESET pulse. This allows firmware to prove liveness by toggling WDI in critical code sections-ensuring recovery from infinite loops or task stalls without external intervention.
Can MAX6366PKA46+ drive SRAM VDD directly?
Yes, MAX6366PKA46+ can drive SRAM VDD directly via its OUT pin, which sources up to 150mA from VCC and switches to BATT during backup. In normal operation, OUT connects to VCC; during brownout, it connects to BATT with <4.6Ω on-resistance (at 2.38V). This eliminates need for external diode-OR or MOSFET switchover circuits in compact µP memory subsystems.
What package type and dimensions does MAX6366PKA46+ use?
MAX6366PKA46+ uses an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. The '+' suffix confirms lead(Pb)-free RoHS-compliant construction. Pin pitch is 0.65mm, and the package is rated for reflow soldering at +260°C (lead-free) per JEDEC J-STD-020. Thermal pad is not internally connected.
MAX6366PKA46+ 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:
- 4.63V
- 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
MAX6366PKA46+ FAQ
1.How can I place an order for MAX6366PKA46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366PKA46+ 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 MAX6366PKA46+ reliable?
The price and inventory of MAX6366PKA46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366PKA46+ is usually 5 days.
3.What payment methods are accepted for MAX6366PKA46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366PKA46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366PKA46+?
MAX6366PKA46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366PKA46+ 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 MAX6366PKA46+?
For technical support, including MAX6366PKA46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366PKA46+ requirements.
6.How does Aetrix verify that MAX6366PKA46+ is sourced from the original manufacturer or authorized distributors?
All MAX6366PKA46+ 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 MAX6366PKA46+ meets industry standards.
7.What is the process for return or replacement of MAX6366PKA46+?
All MAX6366PKA46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366PKA46+, 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 MAX6366PKA46+ part is unused and in its original packaging.
Return procedure for MAX6366PKA46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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