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Analog Devices Inc./Maxim Integrated MAX6366LKA26+T
- Part No.:
- MAX6366LKA26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366LKA26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,794
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Product details
Overview
The MAX6366LKA26+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 supply voltage (reset threshold 2.63 V), asserts an open-drain active-high RESET output on power failure or watchdog timeout, and switches OUT between VCC and backup battery (VBATT) to sustain CMOS RAM during brownout. Designed for portable equipment and industrial controllers requiring reliable power monitoring.
For engineers reviewing the MAX6366LKA26+T datasheet, MAX6366LKA26+T pinout, MAX6366LKA26+T application, or MAX6366LKA26+T equivalent, key selection criteria include its 1.6 s watchdog timeout, 2.63 V factory-set reset threshold, 150 ms minimum reset timeout period, 10 µA quiescent current, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6366LKA26+T implements a precision voltage monitor with ±1.5% threshold accuracy over temperature, a monostable watchdog timer triggered by WDI edge transitions, and a bidirectional MOSFET-based VCC/BATT switchover path with 40 mV hysteresis. Its CE IN-to-CE OUT transmission gate provides 1.5 ns propagation delay and 20–100 Ω on-resistance for real-time chip-enable signal gating during reset events.
RESET assertion logic combines three independent conditions: VCC falling below 2.63 V, WDI remaining static beyond 1.6 s, or manual reset input activation (not applicable to MAX6366). The open-drain active-high RESET output remains asserted for ≥150 ms after recovery, ensuring µP initialization stability across supply transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (factory preset, ±1.5% accuracy over -40°C to +85°C) |
| Watchdog Timeout | 1.6 s (guaranteed 1.0–2.25 s range; resets µP if software hangs) |
| Reset Timeout Period | 150–280 ms (ensures µP completes power-up sequence before release) |
| Quiescent Current | 10 µA (enables multi-year battery life in backup mode) |
| VCC Operating Range | 1.2 V to 5.5 V (supports 1.8 V, 2.5 V, 3.3 V, and 5 V µP rails) |
| Output Type | Open-drain active-high RESET (requires external pull-up; compatible with 1.2–5.5 V logic) |
| Battery Switchover | Automatic VCC-to-BATT transition when VCC < VTH and VCC < VBATT − 20 mV |
Pinout & Package
MAX6366LKA26+T is housed in an 8-pin SOT23 package (2.9 mm × 1.6 mm × 1.1 mm), optimized for high-density PCB layouts in portable and industrial applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, watchdog timeout, or fault; requires external pull-up for logic-level compatibility |
| 2 - CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low enables pass-through, high disables during reset to prevent write corruption |
| 3 - GND | Ground reference | Primary return path for VCC, BATT, and internal circuitry; must be low-impedance connection |
| 4 - WDI | Watchdog input | Edge-sensitive trigger (rising/falling); resets internal timer on each transition; 100 ns minimum pulse width |
| 5 - VCC | Main supply input | Power source for supervisory logic and VCC-to-OUT path; monitored for reset generation |
| 6 - OUT | Regulated output | Sources from VCC normally; switches to BATT during brownout; delivers up to 150 mA at VCC or VBATT |
| 7 - BATT | Backup battery input | Provides hold-up power to OUT when VCC fails; accepts 2.0–5.5 V; draws <1 µA standby current |
| 8 - CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12 µs after reset assertion to complete memory access |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Watchdog Timer | 1.6 s timeout ensures µP firmware execution integrity without external timing components |
| Battery-Backup Switchover | Automatic VCC/BATT switching with 40 mV hysteresis prevents oscillation during slow VCC decay |
| Chip-Enable Gating | 1.5 ns propagation delay and 20–100 Ω on-resistance enable safe SRAM write protection at µP clock speeds |
| Low-Power Operation | 10 µA ICC and 3 µA IBACK extend battery life in always-on backup mode |
| Supply Voltage Immunity | Valid RESET/RESET operation down to 1.2 V VCC or VBATT supports ultra-low-voltage µP systems |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous patient vital sign logging during AC power interruption using coin-cell backup. IC Role / Device Role / Timing Role: Supervisory circuit maintains SRAM data integrity, triggers µP reset on brownout, and gates CE signals to prevent corrupted ECG waveform storage. Use Value: Guarantees 150 ms minimum reset hold time and <1 µA battery drain in backup mode for >5-year shelf life. | Use Scenario: Remote sensor node operating on 24 V DC with local supercapacitor backup. IC Role / Device Role / Timing Role: Monitors 3.3 V logic rail, activates watchdog to detect firmware lockups, and switches memory power to backup source during field maintenance. Use Value: 1.6 s watchdog timeout aligns with deterministic control loop timing; 2.63 V threshold matches 3.3 V rail tolerance. |
| POS Terminal Data Logging | Smart Energy Meter Firmware Recovery |
Use Scenario: Transaction rollback protection during brief utility outages in retail environments. IC Role / Device Role / Timing Role: Asserts RESET to halt µP mid-transaction, gates CE to freeze SRAM writes, and sustains memory via backup battery until power returns. Use Value: Open-drain active-high RESET interfaces directly with ARM Cortex-M reset controllers; 10 µA quiescent current minimizes battery depletion. | Use Scenario: Tamper-resistant firmware update recovery after unexpected power loss during OTA upgrade. IC Role / Device Role / Timing Role: Detects 5 V supply collapse, initiates controlled µP reset, and isolates flash memory CE line to preserve partial update state. Use Value: 2.63 V reset threshold avoids false triggers from 5 V rail ripple; 150 ms tRP ensures bootloader readiness before code execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA26+T | Same 2.63 V reset threshold and watchdog function, but push-pull active-high RESET output instead of open-drain | Eliminates need for external pull-up resistor; incompatible with wired-OR reset bus topologies | Select when driving single µP reset pin without shared reset lines |
| TPS3808G125DBVR | 1.25 V reset threshold, no watchdog timer, 360 ms reset timeout, 2.5 µA IQ | Lacks battery switchover and CE gating; suited for basic power monitoring only | Select when watchdog and memory protection are unnecessary and lower threshold is required |
Compared with MAX6366PKA26+T, the MAX6366LKA26+T offers open-drain flexibility for multi-device reset buses, while TPS3808G125DBVR trades integrated features for ultra-low current and simpler supervision-neither is pin-compatible, requiring layout revision for substitution.
Availability
MAX6366LKA26+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, POS terminal data logging, and smart energy meter firmware recovery requiring stable component supply across extended production lifecycles.
Supply support for MAX6366LKA26+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 product line delivers integrated µP supervision with battery backup, watchdog, and memory protection-engineered for reliability in battery-powered and mission-critical embedded systems.
FAQ
What is the factory-set reset threshold voltage for MAX6366LKA26+T?
The MAX6366LKA26+T has a factory-set reset threshold voltage of 2.63 V, with a guaranteed range of 2.55 V to 2.70 V across -40°C to +85°C. This value is laser-trimmed during production and does not require external configuration. The threshold is referenced internally and remains stable under load, enabling precise monitoring of 2.5 V or 3.3 V supply rails without calibration. MAX6366LKA26+T uses this fixed threshold to initiate reset assertion during VCC brownout conditions.
Does MAX6366LKA26+T support battery-backup operation, and how does switchover work?
Yes, MAX6366LKA26+T supports automatic battery-backup operation. When VCC falls below the 2.63 V reset threshold and also drops at least 20 mV below VBATT, the device switches OUT from VCC to the backup source. Switchover includes 40 mV hysteresis to prevent oscillation during slow VCC decay. In backup mode, MAX6366LKA26+T draws less than 1 µA from VBATT (at 2.8 V) while sustaining SRAM and real-time clocks. The OUT pin delivers up to 150 mA from VCC or VBATT depending on operating mode.
What is the watchdog timeout period of MAX6366LKA26+T, and how is it triggered?
The MAX6366LKA26+T features a watchdog timeout period of 1.6 s, with a guaranteed range of 1.00 s to 2.25 s over temperature. It is triggered when the WDI pin remains static (high or low) beyond this interval-requiring a rising or falling edge at least every 1.6 s to reset the internal timer. Each valid edge clears the timer; failure to do so causes a pulse on the open-drain RESET output for ≥150 ms. This behavior is intrinsic to MAX6366LKA26+T and requires no external components.
Can MAX6366LKA26+T be used without a backup battery?
Yes, MAX6366LKA26+T operates without a backup battery. In this configuration, connect the BATT pin to GND and tie OUT directly to VCC. The device continues full supervision functionality-including VCC monitoring, watchdog timing, and CE gating-with RESET assertion on undervoltage or timeout. All specifications, including 10 µA quiescent current and 2.63 V threshold, remain valid. MAX6366LKA26+T's design accommodates both battery-backed and single-rail implementations without hardware modification.
What package type and pin count does MAX6366LKA26+T use?
MAX6366LKA26+T uses an 8-pin SOT23 package (2.9 mm × 1.6 mm × 1.1 mm), with standard lead (Pb)-free construction indicated by the "+T" suffix. This miniature surface-mount package supports high-density PCB layouts and automated assembly. Pin assignments are fixed per the MAX6366 variant: RESET (pin 1), CE IN (pin 2), GND (pin 3), WDI (pin 4), VCC (pin 5), OUT (pin 6), BATT (pin 7), and CE OUT (pin 8). MAX6366LKA26+T's SOT23 footprint is identical across the MAX6365–MAX6368 family.
MAX6366LKA26+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:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6366LKA26+T FAQ
1.How can I place an order for MAX6366LKA26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366LKA26+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 MAX6366LKA26+T reliable?
The price and inventory of MAX6366LKA26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366LKA26+T is usually 5 days.
3.What payment methods are accepted for MAX6366LKA26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366LKA26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366LKA26+T?
MAX6366LKA26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366LKA26+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 MAX6366LKA26+T?
For technical support, including MAX6366LKA26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366LKA26+T requirements.
6.How does Aetrix verify that MAX6366LKA26+T is sourced from the original manufacturer or authorized distributors?
All MAX6366LKA26+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 MAX6366LKA26+T meets industry standards.
7.What is the process for return or replacement of MAX6366LKA26+T?
All MAX6366LKA26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366LKA26+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 MAX6366LKA26+T part is unused and in its original packaging.
Return procedure for MAX6366LKA26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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