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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:3,187
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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 (1.2V–5.5V), asserts active-high open-drain RESET on power-up/brownout/watchdog timeout, features 3.08V factory-set reset threshold, 1.6s watchdog timeout, and 150ms minimum reset timeout period. It is used in portable equipment requiring reliable power monitoring and data retention during main supply failure.
For engineers reviewing the MAX6366LKA31+T datasheet, MAX6366LKA31+T pinout, MAX6366LKA31+T application, or MAX6366LKA31+T equivalent, key selection criteria include reset threshold accuracy (3.00–3.15V), watchdog timeout tolerance (1.00–2.25s), battery-switchover hysteresis (±20mV), CE IN to CE OUT propagation delay (2–9ns), and guaranteed RESET/RESET operation down to 1.2V supply.
Technical Context
The MAX6366LKA31+T implements a precision voltage monitor with internal 3.08V reset threshold (±0.07V over temperature), a monostable watchdog timer triggered by WDI edge transitions, and bidirectional battery switchover controlled by VCC–VBATT differential sensing. Its chip-enable gating uses a transmission gate with 20–100Ω on-resistance and 1.5ns typical propagation delay.
It operates across –40°C to +85°C, draws only 10µA quiescent current under normal conditions and 3µA in battery-backup mode, and guarantees RESET assertion during VCC drop below threshold, WDI timeout, or manual reset (not applicable - this is MAX6366, not MAX6365), with 150ms minimum reset timeout and 20µs VCC-falling reset delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (min 3.00V, max 3.15V); ensures reliable reset assertion for +3.3V systems with margin against ripple and drift |
| Watchdog Timeout | 1.6s (min 1.00s, max 2.25s); provides sufficient time for firmware recovery while preventing indefinite lockup |
| Reset Timeout Period | 150ms (min), 280ms (max); guarantees µP initialization completes before release from reset |
| Supply Current | 15µA (typ) at VCC = 5.5V; enables ultra-low-power operation in battery-backed memory retention |
| Battery-Backup Current | 3µA (max) at VBATT = 2.8V, VCC = 0V; minimizes backup battery drain during extended outages |
| VCC-to-OUT On-Resistance | 4.6Ω (typ) at VCC = 2.38V, IOUT = 25mA; supports up to 150mA output from main supply with low dropout |
| CE IN to CE OUT Delay | 2–9ns (50Ω source, 50pF load); preserves timing integrity for high-speed µP address/data bus gating |
Pinout & Package
MAX6366LKA31+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-high open-drain reset output | Asserts high during VCC brownout, watchdog timeout, or power-up; requires external pull-down for logic-low default state |
| 2 CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write access during reset or fault |
| 3 GND | Ground reference | Primary return path for VCC, BATT, and all internal circuits; must be low-impedance |
| 4 WDI | Watchdog input | Edge-sensitive trigger (rising/falling ≥100ns); resets internal timer on each transition; floating = timeout |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers device and supplies OUT during normal operation |
| 6 OUT | Power output | Sources from VCC when active; switches to BATT during brownout; delivers up to 150mA |
| 7 BATT | Backup battery input | Connects to 2.0–5.5V backup source; activates switchover when VCC < VBATT − 20mV |
| 8 CE OUT | Chip-enable output | Passes CE IN when reset inactive; held low for 12µs after reset assertion if CE IN was low |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer | 1.6s timeout with edge-triggered reset - prevents firmware hang without software polling overhead |
| Battery switchover hysteresis | ±20mV VCC–VBATT differential - eliminates oscillation during slow VCC decay near threshold |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance - compatible with fast µP buses without timing violation |
| Low-voltage operation | 1.2V minimum VCC/VBATT - supports single-cell Li-ion and coin-cell backup systems |
| Reset output compatibility | Open-drain active-high RESET - enables wired-OR configuration and level-shifting with external pull-down |
Applications
| Portable Medical Monitor | Industrial PLC Module |
|---|---|
Use Scenario: Battery-powered ECG monitor retains real-time waveform buffer during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC asserts RESET to halt µP execution, gates CE to freeze SRAM writes, and switches OUT to backup battery within 20µs of VCC drop. Use Value: Prevents corrupted waveform storage and ensures deterministic restart after power restoration with no data loss. | Use Scenario: Programmable logic controller maintains volatile configuration registers during 200ms utility outage. IC Role / Device Role / Timing Role: MAX6366LKA31+T monitors 3.3V rail, triggers watchdog reset if firmware stalls, and sustains CMOS RAM via BATT-to-OUT path. Use Value: Eliminates need for external backup diodes and discrete reset logic, reducing BOM count by 4 components. |
| POS Terminal with Flash Memory | Smart Energy Meter |
Use Scenario: Point-of-sale terminal performs safe flash update; power interruption mid-write must prevent partial page corruption. IC Role / Device Role / Timing Role: CE gating blocks write enable during brownout; RESET halts µP before flash controller enters invalid state. Use Value: Guarantees atomic flash updates - no firmware rollback or field service required after unexpected power loss. | Use Scenario: M-Bus enabled energy meter logs consumption data hourly; mains failure must preserve last 72h of readings. IC Role / Device Role / Timing Role: MAX6366LKA31+T detects 3.3V rail collapse, asserts RESET to suspend logging, and powers RTC/SRAM from CR2032 via BATT pin. Use Value: Achieves >10-year backup life with 3µA IBACK - exceeds IEC 62053-21 data retention requirements. |
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 reset threshold (3.08V) and watchdog (1.6s), but push-pull active-low RESET output instead of open-drain active-high | Requires redesign of reset net termination; incompatible with wired-OR or level-shifted reset buses | Select when system needs active-low reset with direct drive capability and no external pull-down |
| TPS3808G33DBVR | 3.3V reset threshold (not 3.08V), 200ms reset timeout, no watchdog timer, no battery switchover or CE gating | Lacks battery backup, memory write protection, and watchdog - suitable only for basic power monitoring | Choose only if application requires simple reset generation without supervision, backup, or memory protection |
Compared with MAX6366PKA31+T and TPS3808G33DBVR, the MAX6366LKA31+T uniquely integrates watchdog, battery switchover, and CE gating in one 8-pin SOT23 - eliminating three discrete functions and reducing PCB area by >60% versus discrete solutions.
Availability
MAX6366LKA31+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC modules, POS terminals, smart energy meters, and battery-backed data loggers requiring stable component supply across extended product lifecycles.
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 and mixed-signal ICs for power management, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated power supervision, battery backup, and memory write protection - delivering four critical functions in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage of the MAX6366LKA31+T?
The MAX6366LKA31+T has a factory-trimmed reset threshold of 3.08V, with guaranteed minimum of 3.00V and maximum of 3.15V over –40°C to +85°C. This value is confirmed in the Reset Threshold Ranges table and Electrical Characteristics section of the official datasheet. The "31" suffix in MAX6366LKA31+T explicitly denotes the 3.08V threshold variant. The MAX6366LKA31+T does not require external resistor programming for this threshold.
Does the MAX6366LKA31+T support battery backup functionality?
Yes, the MAX6366LKA31+T fully supports battery backup. When VCC falls below the reset threshold and also drops at least 20mV below VBATT, the internal MOSFET switches OUT from VCC to BATT. In backup mode, it delivers up to 20mA from the battery with only 3µA quiescent draw (VBATT = 2.8V, VCC = 0V). The MAX6366LKA31+T includes dedicated BATT and OUT pins and automatic switchover hysteresis to prevent oscillation.
What is the watchdog timeout behavior of the MAX6366LKA31+T?
The MAX6366LKA31+T features a 1.6s nominal watchdog timeout (1.00–2.25s range), triggered when the WDI pin remains static (high or low) beyond that period. Each rising or falling edge on WDI resets the timer. Upon timeout, it asserts a pulse on the open-drain active-high RESET output for the full reset timeout period (150–280ms). The MAX6366LKA31+T does not require external RC timing components - the watchdog is fully internal and factory-calibrated.
Can the MAX6366LKA31+T be used without a backup battery?
Yes, the MAX6366LKA31+T operates correctly without a backup battery. Per the Applications Information section, connect BATT to GND and tie OUT directly to VCC. All supervision functions - including reset generation, watchdog monitoring, and CE gating - remain fully functional. The MAX6366LKA31+T draws only 10µA from VCC in this configuration and maintains guaranteed RESET assertion down to 1.2V VCC.
What package type and pin compatibility does the MAX6366LKA31+T have?
The MAX6366LKA31+T uses an 8-pin SOT23 package (2.9mm × 1.6mm) with standard pinout per Maxim's Pin Configurations diagram. It shares identical footprint and pin mapping with all MAX6365–MAX6368 variants in LKA, PKA, and HKA suffixes - enabling drop-in replacement across reset threshold, output type, and feature variants (e.g., MAX6366PKA31+T differs only in RESET output structure). The "+T" denotes lead(Pb)-free tape-and-reel packaging.
MAX6366LKA31+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:
- 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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