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Analog Devices Inc./Maxim Integrated MAX6366LKA44+
- Part No.:
- MAX6366LKA44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366LKA44+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,358
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Product details
Overview
MAX6366LKA44+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors +4.38V (typ) VCC supply, asserts active-high open-drain RESET on power-up/down/brownout or watchdog timeout, and maintains CMOS RAM backup via OUT switching between VCC and BATT. Used in portable POS terminals and industrial controllers requiring reliable power-fail recovery.
For engineers reviewing the MAX6366LKA44+ datasheet, MAX6366LKA44+ pinout, MAX6366LKA44+ application, or MAX6366LKA44+ equivalent, key selection criteria include its 1.6s watchdog timeout, 150ms minimum reset timeout, 4.38V factory-set reset threshold, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6366LKA44+ implements a precision voltage monitor with ±1.5% reset threshold accuracy over -40°C to +85°C, coupled with a monolithic watchdog timer that triggers a RESET pulse upon WDI inactivity exceeding 1.6s (typ). Its internal transmission gate provides 1.5ns CE IN-to-CE OUT propagation delay for real-time memory write protection during supply faults.
Battery switchover uses hysteresis-based control: OUT connects to BATT only when VCC falls below both the 4.38V threshold *and* VBATT by ≥20mV; reversion occurs when VCC rises ≥20mV above VBATT. The device guarantees RESET/RESET validity down to 1.2V VCC or VBATT, enabling operation across wide input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.25V (min) to 4.50V (max), factory-trimmed 4.38V typical - ensures reliable detection of +4.38V supply brownout without false triggering |
| Watchdog Timeout Period | 1.00s (min) to 2.25s (max), 1.65s typical - provides robust µP activity monitoring with sufficient margin for software execution latency |
| Reset Timeout Period | 150ms (min) to 280ms (max) - guarantees sufficient hold time for µP initialization after power recovery |
| Supply Current (ICC) | 10µA (min) to 50µA (max) at VCC = 5.5V - enables multi-year battery life in backup mode |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with 1.2V–5V logic domains without level-shifting |
| CE IN to CE OUT Delay | 1.5ns to 9ns - preserves timing integrity for high-speed µP address/data bus gating |
| Output Type | Open-drain active-high RESET - allows wired-OR configuration and flexible pull-up voltage selection |
Pinout & Package
MAX6366LKA44+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for PCB area-constrained applications. Pin assignments are validated per Maxim's official pin configuration diagram for MAX6366.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, WDI timeout, or MR assertion; requires external pull-down for active-low µP interface |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low state blocks writes during reset to prevent data corruption |
| 3 GND | Ground reference | Common return path for VCC, BATT, and all internal circuitry; must be low-impedance for noise immunity |
| 4 WDI | Watchdog input | Edge-sensitive trigger; rising/falling edges within 1.6s reset internal timer; static high/low >2.25s forces reset pulse |
| 5 VCC | Main supply input | Primary power source (1.2V–5.5V); powers internal logic and drives OUT when above reset threshold |
| 6 OUT | Switched output | Sources from VCC normally; switches to BATT during brownout to maintain SRAM power without interruption |
| 7 BATT | Backup battery input | Accepts 2.0V–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 to complete ongoing memory access |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables autonomous µP health monitoring without firmware overhead; eliminates need for external timer IC |
| On-board CE gating with 1.5ns propagation delay | Prevents erroneous SRAM writes during power transitions while maintaining compatibility with 100MHz+ µP buses |
| Factory-trimmed 4.38V reset threshold | Eliminates external resistor network for +4.38V supply monitoring - reduces BOM count and layout complexity |
| 10µA quiescent current in normal operation | Extends battery life in always-on portable equipment; enables use in energy-harvesting systems |
| VCC-to-BATT switchover with 40mV hysteresis | Prevents oscillatory switching during slow VCC ramp-down, ensuring stable SRAM power during brownout |
Applications
| POS Terminal Power Management | Industrial PLC Memory Backup |
|---|---|
Use Scenario: Battery-backed receipt printer and cash drawer controller in retail POS terminals experiencing intermittent AC power loss. IC Role / Device Role / Timing Role: Supervises 4.38V system rail, triggers watchdog reset if payment processing hangs, and switches SRAM to backup battery within 20µs of VCC drop. Use Value: Prevents transaction data loss during 100ms–500ms outages; 150ms reset timeout ensures full µP reboot before next sale. |
Use Scenario: Embedded controller in programmable logic controller (PLC) retaining I/O configuration and runtime variables during factory mains failure. IC Role / Device Role / Timing Role: Monitors 4.38V FPGA I/O bank supply, gates CE to nonvolatile FRAM, and asserts RESET to halt program execution before voltage collapse. Use Value: Guarantees zero-data-loss memory retention for ≥72 hours on coin cell; 1.5ns CE delay avoids bus contention during failover. |
| Medical Infusion Pump Controller | Smart Meter Data Logger |
Use Scenario: Safety-critical infusion pump maintaining dose history and alarm state during brief battery swap or AC dropout. IC Role / Device Role / Timing Role: Watches main 4.38V MCU supply, detects firmware lockup via WDI, and sustains SRAM power from backup LiMnO₂ cell during switchover. Use Value: Meets IEC 62304 Class C requirements for uninterrupted operation; 1.6s watchdog timeout aligns with clinical response latency thresholds. |
Use Scenario: Utility smart meter logging consumption data to EEPROM during grid instability or seasonal battery depletion. IC Role / Device Role / Timing Role: Supervises 4.38V meter SoC supply, disables write cycles via CE gating during brownout, and holds RESET until stable recovery. Use Value: Eliminates EEPROM write corruption risk; 4.38V threshold matches common meter LDO output, avoiding false resets from ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA44+ | Same core functionality but push-pull active-high RESET output instead of open-drain | Requires no external pull-up; unsuitable for wired-OR bus configurations | Select when driving single-load RESET inputs directly and board space permits larger SOT23 marking variant |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no watchdog or battery switchover; 350ms reset timeout | Lacks CE gating, BATT switching, and WDI - limited to basic power monitoring | Choose only for cost-sensitive designs where watchdog and backup features are omitted |
Compared with MAX6366PKA44+, the MAX6366LKA44+ offers open-drain flexibility for multi-drop reset buses, while TPS3808G33DBVR sacrifices critical reliability features (watchdog, battery switchover, CE gating) to reduce unit cost - making it unsuitable for applications requiring data integrity during power faults.
Availability
MAX6366LKA44+ is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLCs, and medical infusion pumps requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6366LKA44+ 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 demanding industrial, medical, and communications applications.
The MAX6365–MAX6368 family delivers integrated µP supervision with battery backup and memory write protection, targeting space-constrained embedded systems needing high reliability under variable power conditions.
FAQ
What is the factory-set reset threshold voltage for MAX6366LKA44+?
The MAX6366LKA44+ has a factory-trimmed reset threshold of 4.38V (typical), with a guaranteed range of 4.25V (min) to 4.50V (max) across -40°C to +85°C. This value is laser-trimmed during production and does not require external components. The '44' suffix in MAX6366LKA44+ explicitly denotes this 4.38V threshold variant, confirmed in Maxim's Ordering Information table and Device Marking Codes.
Does MAX6366LKA44+ support battery-backup operation, and what are the switchover conditions?
Yes, MAX6366LKA44+ supports automatic battery-backup operation. Switchover to BATT occurs only when two conditions are met simultaneously: VCC falls below the 4.38V reset threshold *and* VCC is at least 20mV lower than VBATT. Reversion to VCC happens when VCC rises 20mV above VBATT. This 40mV hysteresis prevents oscillation during slow VCC ramps, ensuring stable SRAM power during brownout events.
What is the watchdog timeout behavior of MAX6366LKA44+, and how is it triggered?
The MAX6366LKA44+ watchdog timer has a nominal timeout of 1.6s (range: 1.00s to 2.25s). It triggers a RESET pulse when the WDI input remains static (high or low) longer than this period. Each rising or falling edge on WDI resets the timer. The MAX6366LKA44+ asserts RESET in pulses - not continuous - for the full 150ms reset timeout period after timeout, allowing µP recovery and continued watchdog monitoring.
Can MAX6366LKA44+ be used without a backup battery, and how should BATT be handled?
Yes, MAX6366LKA44+ operates without a backup battery. In this configuration, connect BATT to GND and tie OUT directly to VCC. The internal battery switchover circuitry remains inactive, and all other functions - reset generation, watchdog monitoring, and CE gating - operate normally. This simplifies design for applications where data retention during power loss is not required.
What is the purpose and electrical specification of the CE IN and CE OUT pins on MAX6366LKA44+?
The CE IN and CE OUT pins implement hardware-enforced memory write protection. During normal operation, CE IN passes through to CE OUT with ≤9ns propagation delay. When RESET asserts, CE OUT is forced low for 12µs (typical) to complete any ongoing memory access, then disconnected and actively pulled up to OUT. This prevents corrupted writes to SRAM/FRAM during power faults, with guaranteed 1.5ns min delay preserving timing for high-speed µPs.
MAX6366LKA44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
MAX6366LKA44+ FAQ
1.How can I place an order for MAX6366LKA44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366LKA44+ 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 MAX6366LKA44+ reliable?
The price and inventory of MAX6366LKA44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366LKA44+ is usually 5 days.
3.What payment methods are accepted for MAX6366LKA44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366LKA44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366LKA44+?
MAX6366LKA44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366LKA44+ 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 MAX6366LKA44+?
For technical support, including MAX6366LKA44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366LKA44+ requirements.
6.How does Aetrix verify that MAX6366LKA44+ is sourced from the original manufacturer or authorized distributors?
All MAX6366LKA44+ 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 MAX6366LKA44+ meets industry standards.
7.What is the process for return or replacement of MAX6366LKA44+?
All MAX6366LKA44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366LKA44+, 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 MAX6366LKA44+ part is unused and in its original packaging.
Return procedure for MAX6366LKA44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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