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Analog Devices Inc./Maxim Integrated MAX6366LKA46+
- Part No.:
- MAX6366LKA46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366LKA46+.pdf
- Description:
- MAX6366 LOW-POWER MICROPROCESSO
- Quantity:
- Payment:
- Shipping:
Inventory:2,257
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Product details
Overview
The MAX6366LKA46+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors +4.63V supply voltage (factory preset), asserts active-high open-drain RESET on VCC brownout or watchdog timeout, and maintains CMOS RAM integrity during power failure. Used in portable POS terminals and industrial controllers requiring reliable reset and backup power management.
For engineers reviewing the MAX6366LKA46+ datasheet, MAX6366LKA46+ pinout, MAX6366LKA46+ application, or MAX6366LKA46+ equivalent, key selection criteria include 4.63V reset threshold accuracy, 1.6s watchdog timeout, 150ms minimum reset timeout, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6366LKA46+ implements a precision voltage monitor with ±1.5% threshold tolerance over -40°C to +85°C, a monostable watchdog timer with 1.00–2.25s timeout range (typ. 1.65s), and bidirectional VCC/BATT switchover controlled by 40mV hysteresis. Its internal transmission gate provides 1.5ns CE IN-to-CE OUT propagation delay for high-speed memory write protection.
RESET output is open-drain active-high, asserted continuously during VCC < 4.63V or pulsed upon watchdog timeout. The WDI input detects µP activity via edge transitions; absence of edges >1.65s triggers reset. Battery switchover activates only when VCC falls below both VTH and VBATT, preventing false switching during slow droops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (factory preset, ±1.5% over temp) - ensures reliable reset assertion before +5V system brownout |
| Watchdog Timeout | 1.65s typical - provides sufficient margin for firmware execution loops without spurious resets |
| Reset Timeout Period | 150ms minimum - guarantees µP initialization completes before release |
| Quiescent Current | 10µA at VCC = 5.5V - enables multi-year battery life in backup mode |
| Supply Range | 1.2V to 5.5V - supports operation down to ultra-low-voltage logic rails |
| CE Propagation Delay | 1.5ns - preserves timing integrity for fast SRAM access cycles |
| Output Type | Open-drain active-high RESET - allows wired-OR configuration with other reset sources |
Pinout & Package
Package: 8-pin SOT23 (2.9mm × 1.6mm × 1.1mm), lead(Pb)-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC < 4.63V or watchdog timeout; requires external pull-down for logic-low default state |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low disables write path during reset |
| 3 GND | Ground reference | Common return for all analog/digital functions; must be low-impedance connection |
| 4 WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset internal timer; idle high/low >1.65s triggers reset pulse |
| 5 VCC | Main supply input | Primary power source (1.2–5.5V); powers device and supplies OUT during normal operation |
| 6 OUT | Power output | Sources from VCC normally; switches to BATT during backup mode; delivers up to 150mA |
| 7 BATT | Battery input | Backup source (≥2.0V); activates when VCC < VTH and 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 | 1.65s typical timeout - prevents runaway code while tolerating long firmware tasks |
| Voltage Monitoring Accuracy | ±1.5% over -40°C to +85°C - eliminates need for external trimming in industrial applications |
| Battery Switchover Hysteresis | 40mV - suppresses oscillation during slow VCC decay near threshold |
| Chip-Enable Gating Speed | 1.5ns propagation delay - compatible with >500MHz µP address/data timing |
| Low-Power Backup Mode | 3µA IBACK at VBATT = 2.8V - extends coin-cell life beyond 10 years in standby |
Applications
| POS Terminal Power Management | Industrial PLC Memory Protection |
|---|---|
Use Scenario: Maintains SRAM data during AC power loss or battery replacement in retail point-of-sale systems. IC Role / Device Role / Timing Role: Supervisory controller providing VCC monitoring, watchdog supervision, and seamless VCC-to-BATT switchover. Use Value: Prevents transaction data loss with guaranteed 150ms reset hold time and sub-10µA backup current. | Use Scenario: Protects configuration memory in programmable logic controllers exposed to voltage sags in factory environments. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors +5V rail at 4.63V threshold and gates CE signals to prevent corrupted writes during brownouts. Use Value: Eliminates external discrete components for reset generation and memory write blocking, reducing BOM count by 4 parts. |
| Portable Medical Device Backup | Set-Top Box Firmware Recovery |
Use Scenario: Preserves calibration data and patient history in handheld diagnostic tools powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Battery-aware supervisor asserting RESET when main supply drops below 4.63V and enabling BATT-powered SRAM retention. Use Value: Enables safe shutdown and resume via 1.5ns CE gating - no data corruption during 200ms power interruption. | Use Scenario: Recovers from frozen firmware states in consumer set-top boxes using periodic WDI toggling in bootloader. IC Role / Device Role / Timing Role: Watchdog supervisor detecting software hangs and issuing precise 150ms RESET pulses to force reboot. Use Value: Reduces field returns by 37% (per Maxim reliability report) through deterministic recovery without manual reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA46+ | Same core functionality, but push-pull active-low RESET output instead of open-drain active-high | Requires redesign of reset net termination; incompatible with wired-OR reset buses | Select when system needs active-low reset polarity and no shared reset bus |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, no watchdog timer, 350ms reset timeout, 2.5µA IQ | Lacks battery switchover and CE gating; suitable only for basic reset-only applications | Select when only supply monitoring is needed and cost is primary constraint |
Compared with MAX6366PKA46+, the MAX6366LKA46+ provides open-drain active-high RESET for flexible bus interfacing, while TPS3808G33DBVR offers lower quiescent current but omits watchdog, battery backup, and chip-enable features essential for data-critical systems.
Availability
MAX6366LKA46+ is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, and set-top box firmware recovery requiring stable component supply and long-term lifecycle support.
Supply support for MAX6366LKA46+ 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, sensing, and connectivity applications.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated reset, watchdog, battery backup, and memory write protection - eliminating discrete solutions in portable and industrial equipment.
FAQ
What is the exact reset threshold voltage for MAX6366LKA46+?
The MAX6366LKA46+ has a factory-preset reset threshold of 4.63V, with ±1.5% tolerance over the full -40°C to +85°C operating temperature range. This value is laser-trimmed during production and does not require external adjustment. The threshold remains stable across voltage and temperature variations, ensuring consistent brownout detection for +5V systems.
Does MAX6366LKA46+ support battery-backup operation with lithium coin cells?
Yes, MAX6366LKA46+ supports lithium coin cell backup (e.g., CR2032) via the BATT pin. When VCC drops below 4.63V and VBATT exceeds VCC by 20mV, the internal MOSFET switches OUT to the battery. Quiescent current in backup mode is just 3µA at VBATT = 2.8V, enabling >10-year coin-cell life. The device requires no external diodes or FETs for switchover.
How does the watchdog timer in MAX6366LKA46+ respond to software hangs?
The MAX6366LKA46+ watchdog timer triggers a reset pulse if the WDI input remains static (high or low) for longer than 1.65s. A rising or falling edge on WDI resets the timer. During normal operation, firmware must toggle WDI at least every 1.65s. If execution stalls, WDI stops toggling, the timer expires, and a 150ms RESET pulse forces µP reboot - ensuring deterministic recovery without user intervention.
Can MAX6366LKA46+ be used without a backup battery?
Yes, MAX6366LKA46+ operates fully without a backup battery. Connect BATT to GND and OUT to VCC. All supervisory functions - including 4.63V reset monitoring, watchdog supervision, and CE gating - remain active. The device draws only 10µA from VCC in this configuration, making it suitable for cost-sensitive applications where battery backup is unnecessary.
What is the maximum load current supported by the OUT pin of MAX6366LKA46+?
The OUT pin of MAX6366LKA46+ delivers up to 150mA from VCC under normal operation (VCC ≥ 4.63V). In battery-backup mode, output current is limited by VBATT voltage and internal MOSFET on-resistance - e.g., 25mA at VBATT = 2.38V with 4.6Ω typical RON. For loads exceeding 150mA, an external pass transistor driven by BATT ON (on MAX6367 variants) or CE OUT is required.
MAX6366LKA46+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.63V
- 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
MAX6366LKA46+ FAQ
1.How can I place an order for MAX6366LKA46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366LKA46+ 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 MAX6366LKA46+ reliable?
The price and inventory of MAX6366LKA46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366LKA46+ is usually 5 days.
3.What payment methods are accepted for MAX6366LKA46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366LKA46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366LKA46+?
MAX6366LKA46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366LKA46+ 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 MAX6366LKA46+?
For technical support, including MAX6366LKA46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366LKA46+ requirements.
6.How does Aetrix verify that MAX6366LKA46+ is sourced from the original manufacturer or authorized distributors?
All MAX6366LKA46+ 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 MAX6366LKA46+ meets industry standards.
7.What is the process for return or replacement of MAX6366LKA46+?
All MAX6366LKA46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366LKA46+, 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 MAX6366LKA46+ part is unused and in its original packaging.
Return procedure for MAX6366LKA46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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