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Analog Devices Inc./Maxim Integrated MAX6366PKA23
- Part No.:
- MAX6366PKA23
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366PKA23.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:425
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Product details
Overview
MAX6366PKA23 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 2.32V), asserts active-high open-drain RESET on power failure or watchdog timeout, supports 1.2V–5.5V operation, and delivers ≤10µA quiescent current - enabling reliable memory protection in portable industrial controllers and battery-backed real-time clocks.
For engineers reviewing the MAX6366PKA23 datasheet, MAX6366PKA23 pinout, MAX6366PKA23 application, or MAX6366PKA23 equivalent, key selection criteria include its 1.6s watchdog timeout, 2.32V factory-set reset threshold, 150ms minimum reset timeout period, open-drain active-high RESET output, and SOT23-8 package compatibility with space-constrained µP systems requiring brownout immunity and backup power management.
Technical Context
The MAX6366PKA23 implements a dedicated watchdog timer with 1.6s timeout (1.00–2.25s range) triggered by WDI edge detection or sustained high/low states; it asserts RESET pulses during timeout events while maintaining continuous assertion during VCC brownout. Its internal MOSFET-based VCC/BATT switchover logic engages only when VCC falls below 2.32V *and* VBATT exceeds VCC by ≥20mV, ensuring clean RAM power handover without oscillation.
Chip-enable gating operates via a transmission gate between CE IN and CE OUT, providing 1.5ns propagation delay (typical) and 20–100Ω on-resistance; CE OUT is actively pulled to OUT during reset, with 12µs hold time if CE IN is low at reset assertion - preserving SRAM read/write integrity during fault recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (factory preset); ensures reliable reset assertion before 3.3V/2.5V µP brownout. |
| Watchdog Timeout | 1.6s (typical); detects µP lockup within defined software execution window. |
| Reset Timeout Period | 150ms minimum; guarantees sufficient µP initialization time after VCC recovery. |
| Supply Current | 10µA max (ICC); enables multi-year battery life in always-on backup mode. |
| Operating Voltage | 1.2V to 5.5V (VCC/VBATT); supports single-cell Li-ion, coin-cell, and main rail monitoring. |
| RESET Output Type | Open-drain active-high; allows wired-OR configuration and flexible pull-up voltage selection. |
| Battery Switchover Hysteresis | 40mV (20mV up + 20mV down); prevents chattering during slow VCC decay near threshold. |
Pinout & Package
MAX6366PKA23 is housed in an 8-pin SOT23-8 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts in portable and industrial control applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high open-drain reset output | Asserts high during VCC brownout, watchdog timeout, or MR/RESET IN fault; requires external pull-down for logic-low default. |
| 2 - CE IN | Chip-enable input | Directly gates CE signal to SRAM; low state blocks writes during power faults. |
| 3 - GND | Ground reference | Common return path for all analog/digital functions; must be low-impedance for accurate threshold sensing. |
| 4 - WDI | Watchdog input | Edge-sensitive trigger; rising/falling edges reset internal timer; static high/low >1.6s initiates reset pulse. |
| 5 - VCC | Main supply input | Primary power source (1.2–5.5V); powers device and supplies OUT until brownout triggers BATT switchover. |
| 6 - OUT | Regulated output | Sources from VCC normally; switches to BATT during backup mode; drives SRAM VDD with ≤150mA capability. |
| 7 - BATT | Backup battery input | Accepts 2.0–5.5V backup source; activates only when VCC < 2.32V and VBATT > VCC + 20mV. |
| 8 - CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs if CE IN is low at reset assertion to complete ongoing memory access. |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer | 1.6s timeout with edge-triggered clear; eliminates need for external timing components in µP hang detection. |
| VCC/BATT switchover | Automatic MOSFET-controlled transition with 40mV hysteresis; maintains uninterrupted SRAM power during mains failure. |
| Chip-enable gating | 1.5ns propagation delay and 20Ω on-resistance; preserves µP/SRAM timing integrity without adding bus loading. |
| Low-voltage operation | 1.2V minimum supply; supports direct connection to single-cell LiFePO₄ or NiMH batteries without regulation. |
| Reset output flexibility | Open-drain active-high RESET; enables level-shifting across mixed-voltage systems (e.g., 3.3V µP with 5V pull-up). |
Applications
| Industrial PLC I/O Modules | Portable Medical Monitors |
|---|---|
Use Scenario: Maintaining volatile configuration data and real-time clock state during AC power interruption in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout reset, battery-backed SRAM power switchover, and watchdog supervision of firmware execution. Use Value: Prevents corrupted parameter storage and clock drift during 10–300ms utility outages using coin-cell backup and 150ms guaranteed reset hold time. | Use Scenario: Preserving patient measurement history and calibration constants in handheld ECG devices powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main rail for safe shutdown sequencing and provides watchdog oversight of sensor acquisition firmware loops. Use Value: Enables 5+ year battery shelf life via 10µA quiescent current and eliminates data loss during unexpected power drops below 2.32V. |
| Smart Energy Meters | Point-of-Sale Terminals |
Use Scenario: Securing tariff data and time-of-use logs during grid voltage sags or meter tampering-induced power cuts. IC Role / Device Role / Timing Role: Battery-backed supervisor asserting RESET to halt µP execution and gating CE to freeze SRAM writes during VCC instability. Use Value: Meets IEC 62053-21 tamper-resistance requirements via 2.32V precision threshold and 1.6s watchdog coverage of critical metering routines. | Use Scenario: Protecting transaction records and encryption keys during brief AC dropout or battery swap in retail kiosks. IC Role / Device Role / Timing Role: Power-fail manager coordinating SRAM write-protection, RTC backup, and secure boot reset signaling. Use Value: Guarantees atomic write completion for financial data using CE OUT's 12µs hold time and 150ms reset timeout before µP restart. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366HKA23 | Same watchdog, reset threshold, and pinout; differs only in output drive strength (push-pull vs. open-drain RESET) | Requires no external pull-up resistor; unsuitable for wired-OR bus configurations | Select when driving a dedicated µP reset input without shared reset lines. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; no integrated watchdog or battery switchover; 3.3V/5V-only operation | Lacks backup power management and µP activity monitoring; used in simpler power-monitoring-only designs | Select when only primary supply monitoring is needed and battery backup is handled externally. |
Compared with MAX6366HKA23 and TPS3808G125DBVR, MAX6366PKA23 uniquely combines open-drain active-high RESET, integrated 1.6s watchdog, and automatic VCC/BATT switchover in a single SOT23-8 package - making it optimal for compact, battery-resilient µP systems where bus sharing and backup autonomy are required.
Availability
MAX6366PKA23 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, smart energy meters, and point-of-sale terminals requiring stable component supply with long-term lifecycle support.
Supply support for MAX6366PKA23 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 delivers ultra-low-power supervisory functionality with integrated battery switchover and chip-enable gating - engineered specifically for µP systems needing robust power-fail response, data retention, and watchdog reliability in space-constrained environments.
FAQ
What is the exact reset threshold voltage of MAX6366PKA23?
The MAX6366PKA23 has a factory-preset reset threshold of 2.32V (minimum 2.25V, maximum 2.38V over temperature). This value is laser-trimmed during production and guarantees reliable assertion of the RESET output when VCC falls below this level, supporting stable operation with 2.5V and 3.3V microprocessor rails.
Does MAX6366PKA23 support battery backup functionality?
Yes, MAX6366PKA23 supports automatic battery backup switchover: when VCC drops below 2.32V *and* VBATT exceeds VCC by at least 20mV, the internal MOSFET connects the backup source to the OUT pin. This maintains power to connected SRAM or real-time clocks without external circuitry, with ≤1µA battery standby current at VBATT = 2.8V.
What is the watchdog timeout behavior of MAX6366PKA23?
The MAX6366PKA23 watchdog timer has a typical timeout of 1.6s (range 1.00–2.25s). It resets on any WDI edge (rising or falling) and triggers a RESET pulse if WDI remains static beyond timeout. The RESET pulse duration is fixed at ≥150ms, ensuring full µP reset regardless of WDI state after timeout.
What package type and pin count does MAX6366PKA23 use?
MAX6366PKA23 uses an 8-pin SOT23-8 package (2.9mm × 1.6mm footprint). Pinout is identical across the MAX6365–MAX6368 family, enabling drop-in replacement among variants - including MAX6366PKA23 (watchdog), MAX6365PKA23 (manual reset), and MAX6368PKA23 (auxiliary reset input).
Can MAX6366PKA23 operate from a 1.2V supply?
Yes, MAX6366PKA23 operates from VCC or VBATT as low as 1.2V, with full functionality including RESET assertion, watchdog timing, and chip-enable gating. Its 10µA max supply current and 1.2V minimum rating make it suitable for direct connection to single-cell LiFePO₄ or NiMH batteries without pre-regulation.
MAX6366PKA23 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:
- 2.32V
- 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
MAX6366PKA23 FAQ
1.How can I place an order for MAX6366PKA23 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366PKA23 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 MAX6366PKA23 reliable?
The price and inventory of MAX6366PKA23 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366PKA23 is usually 5 days.
3.What payment methods are accepted for MAX6366PKA23?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366PKA23 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366PKA23?
MAX6366PKA23 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366PKA23 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 MAX6366PKA23?
For technical support, including MAX6366PKA23 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366PKA23 requirements.
6.How does Aetrix verify that MAX6366PKA23 is sourced from the original manufacturer or authorized distributors?
All MAX6366PKA23 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 MAX6366PKA23 meets industry standards.
7.What is the process for return or replacement of MAX6366PKA23?
All MAX6366PKA23 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366PKA23, 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 MAX6366PKA23 part is unused and in its original packaging.
Return procedure for MAX6366PKA23:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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