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Analog Devices Inc./Maxim Integrated MAX6366HKA26+
- Part No.:
- MAX6366HKA26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366HKA26+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,322
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Product details
Overview
MAX6366HKA26+ 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 = 2.63 V), asserts active-high open-drain RESET on power failure or watchdog timeout, supports 1.2V–5.5V operation, and delivers ≤10 µA quiescent current. It is used in portable battery-powered equipment requiring reliable brownout detection and data retention during main supply loss.
For engineers reviewing the MAX6366HKA26+ datasheet, MAX6366HKA26+ pinout, MAX6366HKA26+ application, or MAX6366HKA26+ equivalent, key selection criteria include its 2.63 V factory-set reset threshold, 1.6 s watchdog timeout, 150 ms minimum reset timeout period, guaranteed RESET/RESET validity down to 1.2 V, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6366HKA26+ implements a precision voltage monitor with ±1.5% threshold accuracy over temperature, a monostable watchdog timer triggered by WDI edge transitions, and an internal transmission gate for CE IN-to-CE OUT signal gating with 1.5 ns propagation delay. Its battery switchover logic requires both VCC < VTH and VCC < VBATT − 20 mV to engage backup mode.
RESET output is open-drain active-high, pulled up externally or internally to OUT; it pulses low for tRP = 150–280 ms upon watchdog timeout and remains asserted continuously during VCC undervoltage. The device guarantees functional operation with VCC or VBATT as low as 1.2 V, and includes 100 ns glitch immunity on WDI input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.63 V (factory preset, ±1.5% over −40°C to +85°C); ensures reliable detection of 2.5 V system supply brownout |
| Watchdog Timeout Period | 1.6 s (typical, 1.0–2.25 s over temp); provides sufficient margin for firmware execution loops without false triggers |
| Reset Timeout Period | 150–280 ms; guarantees µP reset hold time meets boot initialization requirements after VCC recovery |
| Supply Current (ICC) | 10–50 µA (VCC = 2.8–5.5 V); enables multi-year battery life in always-on backup applications |
| Operating Voltage Range | 1.2 V to 5.5 V (VCC or VBATT); supports direct interface with Li-ion, coin-cell, and 3.3 V/5 V logic rails |
| CE IN to CE OUT Delay | 1.5 ns (typical); preserves timing integrity for high-speed µP address/data bus gating |
| Output Type | Open-drain active-high RESET; allows flexible pull-up to VCC, OUT, or external rail for level-shifting or wired-OR configurations |
Pinout & Package
MAX6366HKA26+ is housed in an 8-pin SOT23 package (3.0 mm × 1.7 mm × 1.3 mm), optimized for PCB area-constrained designs in portable and industrial control systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, manual reset (not applicable), or watchdog timeout; requires external pull-up |
| 2 - CE IN | Chip-enable input | Controls gating path to CE OUT; low disables CE OUT during reset to prevent RAM write corruption |
| 3 - GND | Ground reference | Primary return path for all internal circuits and output sinks; must be low-impedance connection |
| 4 - WDI | Watchdog input | Edge-sensitive trigger (rising/falling ≥100 ns); resets internal timer on each transition; held static >1.6 s forces reset pulse |
| 5 - VCC | Main supply input | Power source for monitoring, logic, and VCC-to-OUT switching; valid from 1.2 V to 5.5 V |
| 6 - OUT | Switched output | Sources from VCC in normal mode; switches to BATT during backup; drives SRAM VDD with up to 150 mA |
| 7 - BATT | Battery backup input | Backup supply input; engages when VCC < VTH and VCC < VBATT − 20 mV; supports 0–6 V range |
| 8 - CE OUT | Chip-enable output | Gated version of CE IN; goes low only when CE IN is low and reset is not asserted; actively pulled up to OUT when disabled |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6 s timeout | Enables autonomous firmware health monitoring without CPU intervention; prevents lockup-induced data loss |
| VCC-to-BATT switchover with 40 mV hysteresis | Eliminates oscillation during slow VCC decay; ensures clean, single-event transition to backup power |
| On-board CE signal gating (1.5 ns delay) | Prevents spurious memory writes during power faults by disabling chip-select path within nanoseconds of reset assertion |
| 10 µA max supply current at 2.8 V | Extends battery runtime in always-on backup mode; reduces thermal load in sealed enclosures |
| Guaranteed operation down to 1.2 V on VCC or VBATT | Supports deep discharge battery chemistries (e.g., LiFePO₄, alkaline) without functional degradation |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Continuous ECG waveform logging in handheld patient monitors powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Supervises main 3.3 V rail, triggers watchdog if firmware hangs, and switches SRAM to backup power during AC adapter removal or low-battery shutdown. Use Value: Preserves 72+ hours of clinical data in volatile memory without external backup controllers or discrete MOSFETs. |
Use Scenario: Remote digital input modules operating in factory environments with unstable 24 V DC supplies. IC Role / Device Role / Timing Role: Monitors 5 V local regulation, gates CE to isolated RS-485 transceivers during brownout, and asserts reset to prevent corrupted register writes. Use Value: Eliminates need for external voltage supervisors and discrete level translators while meeting IEC 61000-4-2/4-4 immunity requirements. |
| Point-of-Sale Terminals | Smart Energy Meters |
|
Use Scenario: Battery-backed transaction log storage in retail terminals during mains power interruption. IC Role / Device Role / Timing Role: Detects 5 V supply collapse, activates watchdog to verify payment processing thread, and powers real-time clock + flash buffer from coin cell. Use Value: Ensures atomic commit of financial records even during sub-100 ms grid glitches-no transaction rollback required. |
Use Scenario: Tamper-resistant metering ICs retaining calibration constants and billing history during utility outages. IC Role / Device Role / Timing Role: Supervises 3.3 V metrology rail, gates CE to secure EEPROM, and initiates controlled shutdown sequence via µP interrupt on RESET assertion. Use Value: Meets ANSI C12.1 and IEC 62053-21 requirements for non-volatile data retention under extended brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA26+ | Same reset threshold (2.63 V) and watchdog function, but push-pull active-low RESET output instead of open-drain active-high | Requires redesign of RESET pull-up network and may conflict with existing µP reset polarity logic | Select when µP reset input is active-low and board layout cannot accommodate external pull-up resistor |
| TPS3808G125DBVR | Fixed 1.25 V reset threshold, no watchdog timer, 360 ms reset timeout, 2.9 µA quiescent current | Lacks battery switchover and CE gating; suitable only for basic power-on reset, not full supervisory functionality | Choose only for cost-sensitive, low-complexity systems where watchdog and backup features are unnecessary |
Compared with MAX6366HKA26+, MAX6366PKA26+ offers identical supervision accuracy and timing but differs in RESET polarity and drive type-requiring schematic and firmware validation. TPS3808G125DBVR omits critical functions (watchdog, battery switchover, CE gating), making it unsuitable as a drop-in replacement for applications relying on those capabilities.
Availability
MAX6366HKA26+ 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 across extended production lifecycles.
Supply support for MAX6366HKA26+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, computing, and communications markets.
The MAX6365–MAX6368 family was designed to replace discrete reset + battery switchover + watchdog circuits in space- and power-constrained µP systems, integrating all three functions into a single 8-pin SOT23 package.
FAQ
What is the factory-set reset threshold voltage for MAX6366HKA26+?
The MAX6366HKA26+ has a factory-set reset threshold voltage of 2.63 V (typical), with a guaranteed range of 2.55 V to 2.70 V over −40°C to +85°C. This value is laser-trimmed during production and applies to VCC monitoring; it is fixed and not user-adjustable. The '26' suffix in MAX6366HKA26+ explicitly denotes this 2.63 V threshold per Maxim's ordering nomenclature.
Does MAX6366HKA26+ support battery-backup operation with a 1.8 V coin cell?
No, MAX6366HKA26+ does not support reliable battery-backup operation with a 1.8 V coin cell. Its minimum operating voltage is 1.2 V, but the battery switchover condition requires VBATT > VCC + 20 mV, and VCC must first fall below 2.55 V (minimum reset threshold). A 1.8 V cell cannot sustain OUT regulation when VCC drops to ~2.5 V, risking brownout before switchover completes. Use ≥2.3 V backup sources (e.g., CR2032, LiFePO₄).
How does the watchdog timer in MAX6366HKA26+ respond to software hangs?
The MAX6366HKA26+ watchdog timer triggers a reset pulse if the WDI input remains static (high or low) for longer than 1.6 s (typical). It clears on every rising or falling edge ≥100 ns wide. During a software hang, WDI stops toggling, causing the timer to expire and assert RESET for 150–280 ms-rebooting the µP. This behavior is confirmed in the Electrical Characteristics table and Figure 2 of the MAX6366HKA26+ datasheet.
Can MAX6366HKA26+ drive a 100 kΩ pull-up resistor on the RESET pin?
Yes, MAX6366HKA26+ can reliably drive a 100 kΩ pull-up resistor on the RESET pin. Its open-drain RESET output specifies VOH ≥ 0.8 × VCC when sourcing 200 µA (for MAX636_H variants), and 100 kΩ pull-up to 3.3 V draws only 33 µA-well within capability. This configuration ensures clean logic-high levels during normal operation while maintaining compatibility with µP reset inputs requiring weak pull-ups.
What is the maximum continuous current that MAX6366HKA26+ can deliver from the OUT pin?
The MAX6366HKA26+ can deliver up to 150 mA continuously from the OUT pin when powered by VCC (e.g., VCC = 4.75 V). In battery-backup mode, current capability depends on VBATT and temperature; typical BATT-to-OUT on-resistance is 4.6 Ω at VBATT = 2.38 V and 25°C, limiting practical current to ~50 mA before excessive dropout. These values are specified in the Electrical Characteristics table under "VCC to OUT On-Resistance" and "Output Voltage in Battery-Backup Mode".
MAX6366HKA26+ 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:
- 2.63V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6366HKA26+ FAQ
1.How can I place an order for MAX6366HKA26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366HKA26+ 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 MAX6366HKA26+ reliable?
The price and inventory of MAX6366HKA26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366HKA26+ is usually 5 days.
3.What payment methods are accepted for MAX6366HKA26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366HKA26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366HKA26+?
MAX6366HKA26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366HKA26+ 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 MAX6366HKA26+?
For technical support, including MAX6366HKA26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366HKA26+ requirements.
6.How does Aetrix verify that MAX6366HKA26+ is sourced from the original manufacturer or authorized distributors?
All MAX6366HKA26+ 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 MAX6366HKA26+ meets industry standards.
7.What is the process for return or replacement of MAX6366HKA26+?
All MAX6366HKA26+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366HKA26+, 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 MAX6366HKA26+ part is unused and in its original packaging.
Return procedure for MAX6366HKA26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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