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Analog Devices Inc./Maxim Integrated MAX6366LKA31
- Part No.:
- MAX6366LKA31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366LKA31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,352
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Product details
Overview
The MAX6366LKA31 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 failure or watchdog timeout, provides 3.08V ±70mV reset threshold, delivers ≤10µA quiescent current, and supports CMOS RAM backup in brownout conditions for portable industrial controllers.
For engineers reviewing the MAX6366LKA31 datasheet, MAX6366LKA31 pinout, MAX6366LKA31 application, or MAX6366LKA31 equivalent, this page delivers verified functional identity, watchdog timing behavior, battery-switchover hysteresis, CE gating propagation delay, and precise reset threshold validation - all confirmed against Maxim's official MAX6365–MAX6368 datasheet Rev 1 (June 2001).
Technical Context
The MAX6366LKA31 implements a dedicated watchdog timer with 1.6s nominal timeout (1.00–2.25s over temperature), triggered by WDI edge detection or sustained high/low states. Its internal reset generator guarantees RESET assertion during VCC < 3.08V, MR low (if present), or WDI timeout - with 150ms minimum active period (tRP) after recovery.
Battery switchover uses dual-voltage comparison: OUT connects to BATT only when VCC falls below both the 3.08V threshold *and* VBATT by ≥20mV, with 40mV hysteresis preventing oscillation. Chip-enable gating employs a transmission gate with 1.5ns typical propagation delay (50Ω source, 50pF load) and 20–100Ω on-resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±70mV - precisely sets power-fail detection point for +3.3V systems with margin against ripple. |
| Watchdog Timeout | 1.6s nominal (1.00–2.25s) - ensures µP firmware hangs are detected before critical state corruption occurs. |
| Quiescent Current | ≤10µA at VCC = 5.5V - enables multi-year operation on coin-cell backup without significant drain. |
| RESET Output Type | Open-drain active-high - allows wired-OR configuration and level-shifting across voltage domains. |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with low-voltage µPs and legacy 5V logic without external regulators. |
| Battery Switchover Hysteresis | 40mV - prevents rapid toggling of OUT between VCC and BATT during slow VCC decay near threshold. |
| CE IN to CE OUT Delay | 1.5ns typical - preserves timing integrity for high-speed memory access in SRAM-based embedded systems. |
Pinout & Package
MAX6366LKA31 is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained portable and industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, WDI timeout, or manual reset; requires external pull-down for active-low µP interface. |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low disables write path during reset to prevent data corruption. |
| 3 GND | Ground reference | Common return for VCC, BATT, and signal paths; must be low-impedance for accurate threshold sensing. |
| 4 WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset internal timer; sustained 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 until switchover condition met. |
| 6 OUT | Regulated output | Delivers up to 150mA from VCC or BATT; switches automatically to battery when VCC < VTH and VCC < VBATT −20mV. |
| 7 BATT | Backup battery input | Accepts 2.0–5.5V battery; sources OUT during brownout; draws <1µA standby current when VCC active. |
| 8 CE OUT | Chip-enable output | Passes CE IN when reset inactive; held low for 12µs after reset assertion if CE IN was low, ensuring SRAM transaction completion. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated watchdog timer | 1.6s timeout with edge-triggered reset clearance - eliminates need for external timer IC and reduces BOM count. |
| Battery switchover with hysteresis | 40mV switching hysteresis prevents oscillation during slow VCC decay - ensures stable SRAM power during brownout recovery. |
| Chip-enable gating with sub-2ns delay | 1.5ns typical CE IN→CE OUT propagation - maintains compatibility with fast µPs and DSPs without timing budget impact. |
| Ultra-low quiescent current | ≤10µA supply current - extends battery life in always-on monitoring applications such as POS terminals and IoT edge nodes. |
| Reset threshold accuracy | ±70mV over -40°C to +85°C - guarantees reliable power-fail detection across industrial temperature range without calibration. |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered ECG monitor maintaining real-time waveform storage during AC power loss. IC Role / Device Role / Timing Role: Supervisory controller asserting RESET to halt µP execution and enabling BATT→OUT switchover to preserve SRAM contents. Use Value: Prevents data loss during 100ms–500ms grid interruptions using 3.08V threshold aligned with Li-ion discharge curve. |
Use Scenario: DIN-rail mounted PLC module operating in factory environments with noisy 24V DC supply. IC Role / Device Role / Timing Role: Watchdog supervisor detecting firmware lockups and triggering controlled µP restart without field service. Use Value: 1.6s timeout matches typical control loop cycle time, minimizing spurious resets while ensuring deterministic recovery. |
| Retail Point-of-Sale Terminals | Smart Energy Meters |
|
Use Scenario: Credit card terminal performing secure transaction logging with nonvolatile SRAM backup. IC Role / Device Role / Timing Role: Chip-enable gate disabling SRAM writes during VCC brownout to prevent partial-record corruption. Use Value: 1.5ns CE propagation delay preserves 10MHz bus timing; 150ms reset timeout exceeds EEPROM write latency. |
Use Scenario: Utility meter retaining tamper logs and billing data during mains outage. IC Role / Device Role / Timing Role: Dual-supply supervisor managing switchover from 3.3V system rail to CR2032 coin cell. Use Value: ≤10µA ICC and <1µA IBATT enable >5-year battery life; 40mV hysteresis avoids false switchover on line transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA31 | Same 3.08V threshold and watchdog function, but push-pull active-low RESET output instead of open-drain active-high. | Requires no external pull-up resistor; incompatible with wired-OR reset buses or level-shifted µP interfaces. | Select when interfacing with legacy µPs requiring active-low push-pull reset and no shared reset bus. |
| MAX6366HKA31 | Identical electrical specs and pinout, but rated for -40°C to +125°C extended temperature range (vs. -40°C to +85°C). | Suitable for under-hood automotive or high-temperature industrial enclosures where ambient exceeds 85°C. | Select for AEC-Q100-adjacent designs or harsh-environment deployments requiring wider thermal margin. |
Compared with MAX6366PKA31 and MAX6366HKA31, the MAX6366LKA31 offers optimal balance of open-drain flexibility for system-level reset arbitration and commercial-temperature cost efficiency - making it ideal for consumer-grade portable electronics and standard industrial controls.
Availability
MAX6366LKA31 is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, retail point-of-sale terminals, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6366LKA31 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 embedded systems.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated power supervision, battery backup, and memory protection - with the MAX6366LKA31 specifically optimized for watchdog-enabled portable and industrial applications.
FAQ
What is the exact reset threshold voltage of the MAX6366LKA31?
The MAX6366LKA31 has a factory-trimmed reset threshold of 3.08V, with guaranteed limits of 3.00V (min) and 3.15V (max) over the full -40°C to +85°C operating temperature range. This value is confirmed in the Reset Threshold Ranges table and Electrical Characteristics section of the official datasheet, and aligns with the "KA31" suffix designation.
Does the MAX6366LKA31 support battery backup for SRAM, and how does switchover work?
Yes, the MAX6366LKA31 supports automatic battery backup for SRAM via its OUT pin. Switchover occurs only when two conditions are met simultaneously: VCC falls below the 3.08V reset threshold *and* VCC drops at least 20mV below VBATT. A 40mV hysteresis prevents oscillation during slow VCC decay, ensuring stable SRAM power during brownout events.
What is the watchdog timeout behavior of the MAX6366LKA31, and how is it cleared?
The MAX6366LKA31 features a 1.6s nominal watchdog timeout (1.00–2.25s over temperature). The timer clears on any rising or falling edge at the WDI pin - not just periodic pulses. If WDI remains static (high or low) beyond the timeout, a RESET pulse is generated for the 150ms minimum reset period (tRP).
Can the MAX6366LKA31 drive a standard active-low microprocessor reset input?
Yes, the MAX6366LKA31's RESET pin is an open-drain active-high output. To interface with an active-low µP reset input, connect a pull-down resistor (e.g., 10kΩ) from RESET to GND. When RESET asserts, it pulls high; the external pull-down converts this to a logic-low signal at the µP pin.
What is the maximum continuous output current capability of the MAX6366LKA31's OUT pin?
The MAX6366LKA31's OUT pin delivers up to 150mA when sourced from VCC (e.g., VCC = 4.75V), and up to 65mA when sourced from VCC = 3.15V. In battery-backup mode, output current depends on VBATT voltage and load - with typical capability of 25mA at VBATT = 2.38V and 10mA at VBATT = 2.25V, per the Electrical Characteristics table.
MAX6366LKA31 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 FAQ
1.How can I place an order for MAX6366LKA31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366LKA31 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 reliable?
The price and inventory of MAX6366LKA31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366LKA31 is usually 5 days.
3.What payment methods are accepted for MAX6366LKA31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366LKA31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366LKA31?
MAX6366LKA31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366LKA31 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?
For technical support, including MAX6366LKA31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366LKA31 requirements.
6.How does Aetrix verify that MAX6366LKA31 is sourced from the original manufacturer or authorized distributors?
All MAX6366LKA31 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 meets industry standards.
7.What is the process for return or replacement of MAX6366LKA31?
All MAX6366LKA31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366LKA31, 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 part is unused and in its original packaging.
Return procedure for MAX6366LKA31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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