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Analog Devices Inc./Maxim Integrated MAX6366LKA31-T
- Part No.:
- MAX6366LKA31-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366LKA31-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:15,097
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Product details
Overview
The MAX6366LKA31-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 = 3.08V), asserts active-high open-drain RESET on power failure or watchdog timeout, supports 1.2V–5.5V operation, and delivers up to 150mA from VCC or backup battery. It is used in portable equipment requiring reliable brownout protection and nonvolatile memory retention during main supply loss.
For engineers reviewing the MAX6366LKA31-T datasheet, MAX6366LKA31-T pinout, MAX6366LKA31-T application, or MAX6366LKA31-T equivalent, key selection criteria include its 3.08V factory-trimmed reset threshold, 1.6s watchdog timeout, 150ms minimum reset timeout period, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6366LKA31-T implements a precision voltage monitor with ±1.5% threshold accuracy over temperature, a monostable watchdog timer with 1.00–2.25s timeout range (typ. 1.6s), and a bidirectional VCC/BATT switchover MOSFET with <4.6Ω on-resistance at 2.38V. Its internal chip-enable transmission gate provides 1.5ns propagation delay and 20–100Ω on-resistance for CE signal gating during reset events.
It operates across -40°C to +85°C, guarantees RESET/RESET validity down to 1.2V (VCC or VBATT), and features power-supply transient immunity validated to reject 30µs, 100mV VCC glitches. The device uses an internal 20kΩ pullup on WDI and requires no external components for basic watchdog functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (factory-trimmed, ±1.5% over temp) - ensures reliable detection of 3.3V rail brownout before µP malfunction |
| Watchdog Timeout | 1.6s typical (1.00–2.25s range) - provides sufficient margin for firmware execution loops without false triggers |
| Reset Timeout Period | 150ms minimum - guarantees µP initialization completes before release from reset |
| Supply Current | 15µA typical at 5.5V - enables multi-year battery life in always-on backup mode |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with 1.2V logic, 1.8V, 2.5V, 3.3V, and 5V µP domains |
| Output Type | Open-drain active-high RESET - allows wired-OR configuration and flexible pullup voltage selection |
| Battery Switchover | Automatic VCC-to-BATT transition when VCC < VTH and VCC < (VBATT − 20mV) - preserves SRAM data without external control |
Pinout & Package
MAX6366LKA31-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, watchdog timeout, or manual reset; requires external pullup for logic-level compatibility |
| 2: CE IN | Chip-enable input | Controls gating path to CE OUT; low during normal operation, disabled during reset to prevent RAM corruption |
| 3: GND | Ground reference | Primary return path for VCC, BATT, and all internal circuits; must be low-impedance connection |
| 4: WDI | Watchdog input | Edge-sensitive trigger (rising/falling ≥100ns); resets internal timer on each transition; internally pulled up to VCC |
| 5: VCC | Main supply input | Power source for internal circuitry and OUT driver; monitored for reset assertion; supports 1.2V–5.5V |
| 6: OUT | Switched output | Sources from VCC (up to 150mA) or BATT (in backup mode); powers SRAM or real-time clock during main supply loss |
| 7: BATT | Backup battery input | Provides hold-up power when VCC fails; activates switchover if >20mV above VCC and VCC < VTH |
| 8: CE OUT | Chip-enable output | Gated CE signal passed from CE IN; held low for 12µs after reset assertion to complete ongoing memory access |
Key Features
| Feature | Design Value |
|---|---|
| Integrated watchdog timer | 1.6s timeout eliminates need for external timing components and reduces firmware watchdog management overhead |
| VCC/BATT switchover MOSFET | Sub-5Ω on-resistance ensures minimal voltage drop (<150mV at 30mA) during battery-backup operation |
| Chip-enable gating | 1.5ns propagation delay and 20Ω on-resistance enable use with high-speed µPs and DSPs without timing violation |
| Low 10µA quiescent current | Extends battery life in always-on backup applications such as RTCs and SRAM retention for >5 years on CR2032 |
| Reset threshold accuracy | ±1.5% over -40°C to +85°C ensures consistent brownout detection across industrial temperature range |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retains real-time sensor data and calibration settings during AC adapter disconnection or low-battery shutdown. IC Role / Device Role / Timing Role: Supervisory IC monitors 3.3V system rail, triggers watchdog if firmware hangs, and switches SRAM to coin-cell backup within 20µs of VCC collapse. Use Value: Prevents loss of critical patient data and eliminates need for external backup power sequencing logic. | Use Scenario: Remote I/O module in factory automation maintains register state and communication buffers during brief 24VDC supply dips caused by motor startup. IC Role / Device Role / Timing Role: Acts as power-fail detector and watchdog controller; asserts RESET to halt µP execution and gates CE to freeze memory writes until stable power returns. Use Value: Ensures deterministic recovery and prevents corrupted Modbus register updates during transient brownouts. |
| Point-of-Sale Terminals | Smart Energy Meters |
Use Scenario: Handheld POS terminal preserves transaction logs and encryption keys during hot-swap battery replacement or accidental power loss. IC Role / Device Role / Timing Role: Provides 150ms reset hold time and battery-backed SRAM power via OUT pin; WDI monitors application heartbeat to detect OS lockups. Use Value: Guarantees atomic transaction commit and eliminates requirement for EEPROM wear leveling in firmware. | Use Scenario: Electricity meter retains time-of-use billing data and tamper logs during grid outages lasting minutes to hours. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller rail, enables battery-backed RTC and FRAM, and asserts RESET only after confirmed 3.08V threshold breach to avoid nuisance resets. Use Value: Meets IEC 62053-21 data retention requirements without adding discrete supervisor + watchdog + switch ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA31-T | Same 3.08V reset threshold and watchdog, but push-pull active-low RESET output instead of open-drain active-high | Requires redesign of RESET pullup network and may conflict with existing wired-OR reset buses | Select when system design mandates active-low reset polarity and no shared reset bus |
| TPS3808G33DBVR | 3.3V reset threshold (not 3.08V), no integrated watchdog timer, no battery switchover, 350ms reset timeout | Lacks battery backup and watchdog functions; suitable only for basic power monitoring without memory retention | Select only if watchdog and backup power are handled externally and 3.3V threshold suffices |
Compared with MAX6366PKA31-T and TPS3808G33DBVR, the MAX6366LKA31-T uniquely combines precise 3.08V monitoring, integrated 1.6s watchdog, and automatic battery switchover in a single SOT23-8 package-enabling compact, fail-safe µP supervision where data integrity during power loss is mandatory.
Availability
MAX6366LKA31-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, point-of-sale terminals, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6366LKA31-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, 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 supervision, battery backup, and memory write protection in ultra-small form factors-targeting portable, battery-critical, and industrial edge devices.
FAQ
What is the factory-set reset threshold voltage for MAX6366LKA31-T?
The MAX6366LKA31-T has a factory-trimmed reset threshold of 3.08V (minimum 3.00V, maximum 3.15V). This value is laser-trimmed during production and guaranteed over the full -40°C to +85°C operating temperature range with ±1.5% accuracy. The "31" suffix in the part number directly references this 3.08V nominal threshold per Maxim's Reset Threshold Ranges table. This makes MAX6366LKA31-T ideal for monitoring standard 3.3V rails where early brownout detection is required before µP operational failure.
Does MAX6366LKA31-T include a watchdog timer, and what is its timeout behavior?
Yes, MAX6366LKA31-T integrates a watchdog timer with a typical timeout period of 1.6s (range: 1.00s to 2.25s). The timer resets on any rising or falling edge at the WDI pin and triggers a pulse on the active-high RESET output if WDI remains static beyond the timeout. The reset pulse duration is fixed at ≥150ms. Unlike windowed watchdogs, MAX6366LKA31-T uses a simple one-shot timeout, making it compatible with firmware that toggles WDI at predictable intervals without requiring precise timing windows.
How does the battery switchover function work in MAX6366LKA31-T?
MAX6366LKA31-T automatically switches the OUT pin from VCC to BATT when two conditions are met: VCC falls below the 3.08V reset threshold AND VCC drops at least 20mV below VBATT. The 40mV total hysteresis (20mV up, 20mV down) prevents oscillation during slow VCC decay. In backup mode, OUT sources from the higher of VCC or BATT, delivering up to 150mA from VCC or sustaining low-power loads from battery. The device draws only 3µA from BATT when VCC = 0V, enabling multi-year coin-cell operation.
What is the purpose of the CE IN and CE OUT pins on MAX6366LKA31-T?
The CE IN and CE OUT pins implement hardware-enforced chip-enable gating to prevent memory corruption during power faults. When CE IN is driven low (e.g., by µP address decode), CE OUT follows with ≤9ns propagation delay. During reset assertion, CE OUT is forced low for 12µs to complete any pending memory access, then actively pulled high to OUT. This blocks spurious CE transitions that could cause erroneous SRAM writes during brownout-eliminating the need for software-based write-protection schemes or external logic.
Can MAX6366LKA31-T operate with a 1.2V supply, and what functions remain active?
Yes, MAX6366LKA31-T guarantees full functionality-including RESET assertion, watchdog monitoring, and CE gating-down to 1.2V on either VCC or VBATT. Its internal bandgap reference and comparator circuitry are designed for sub-1.8V operation, and RESET/RESET outputs remain valid at 1.2V. This enables use with ultra-low-voltage µPs (e.g., ARM Cortex-M0+ cores) and extends battery life in deep-sleep modes. Quiescent current stays at 15µA typical even at 1.2V, ensuring minimal drain during extended backup periods.
MAX6366LKA31-T 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:
- 3.08V
- 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
MAX6366LKA31-T FAQ
1.How can I place an order for MAX6366LKA31-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366LKA31-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 MAX6366LKA31-T reliable?
The price and inventory of MAX6366LKA31-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366LKA31-T is usually 5 days.
3.What payment methods are accepted for MAX6366LKA31-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366LKA31-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366LKA31-T?
MAX6366LKA31-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366LKA31-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 MAX6366LKA31-T?
For technical support, including MAX6366LKA31-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366LKA31-T requirements.
6.How does Aetrix verify that MAX6366LKA31-T is sourced from the original manufacturer or authorized distributors?
All MAX6366LKA31-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 MAX6366LKA31-T meets industry standards.
7.What is the process for return or replacement of MAX6366LKA31-T?
All MAX6366LKA31-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366LKA31-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 MAX6366LKA31-T part is unused and in its original packaging.
Return procedure for MAX6366LKA31-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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