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Analog Devices Inc./Maxim Integrated MAX6366HKA31+T
- Part No.:
- MAX6366HKA31+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366HKA31+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,984
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Product details
Overview
MAX6366HKA31+T from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors +3.08V supply (factory preset threshold), asserts active-high open-drain RESET on power-up/brownout/watchdog timeout, supports 1.2V–5.5V operation, and delivers up to 150mA from VCC or backup battery. Used in portable POS terminals and industrial controllers requiring reliable reset and data retention during main supply failure.
For engineers reviewing the MAX6366HKA31+T datasheet, MAX6366HKA31+T pinout, MAX6366HKA31+T application, or MAX6366HKA31+T equivalent, key selection criteria include its 3.08V reset threshold, 1.6s watchdog timeout, 150ms reset timeout period, 10µA quiescent current, and SOT23-8 package with CE IN/CE OUT signal gating capability.
Technical Context
The MAX6366HKA31+T integrates a precision voltage monitor with ±1.5% threshold accuracy over temperature, a monostable watchdog timer with 1.00–2.25s timeout range (typ. 1.6s), and bidirectional VCC/BATT switchover logic with 40mV hysteresis. Its internal transmission gate provides 1.5ns CE IN-to-CE OUT propagation delay under 50Ω drive and 50pF load.
RESET output is open-drain active-high, pulled up externally or internally to OUT; it remains asserted for ≥150ms after VCC rises above 3.08V or after watchdog timeout. Battery-backup mode activates only when VCC < VTH and VCC < (VBATT − 20mV), ensuring clean switchover without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.00V to 3.15V (factory preset 3.08V); ensures reliable reset assertion before 3.3V system brownout. |
| Watchdog Timeout | 1.00–2.25s (typ. 1.6s); detects µP lockup in embedded control loops without excessive false triggers. |
| Reset Timeout Period | 150–280ms; guarantees sufficient hold time for µP initialization after power recovery. |
| Supply Current | 10–50µA (typ. 15µA at 5.5V); enables multi-year battery life in always-on backup applications. |
| VCC Operating Range | 1.2V to 5.5V; supports direct interface with 1.8V, 2.5V, 3.3V, and 5V logic domains. |
| Battery-Backup Current | 3µA max (at VBATT = 2.8V, TA = −40°C to +85°C); minimizes drain on coin-cell batteries. |
| CE Propagation Delay | 2–9ns (50Ω source, 50pF load); preserves timing integrity for high-speed µP address/data gating. |
Pinout & Package
MAX6366HKA31+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm, 0.95mm pitch) with exposed pad for thermal enhancement. Pin 1 is marked by a dot; top view orientation follows JEDEC MO-178.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Pulled high externally or to OUT; asserts high during VCC brownout, WDI timeout, or MR low (not applicable here). |
| 2 CE IN | Chip-enable input | Connected to µP CE line; gates memory access during reset to prevent write corruption. |
| 3 GND | Ground reference | Common return for VCC, BATT, and digital logic; must be low-impedance for noise immunity. |
| 4 WDI | Watchdog input | Rising/falling edge resets internal timer; idle 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 during normal operation. |
| 6 OUT | Output power rail | Sources from VCC (≤150mA) or BATT (≥10mA) depending on switchover state; powers SRAM/RTC. |
| 7 BATT | Backup battery input | Accepts 2.0–5.5V battery; connects to OUT only when VCC < VTH and VCC < (VBATT − 20mV). |
| 8 CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs if CE IN low at reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables autonomous detection of firmware hangs in battery-powered controllers without host intervention. |
| 1.5ns CE IN-to-CE OUT propagation delay | Preserves memory access timing margins for 20+ MHz µPs and DSPs without added latency. |
| 10µA quiescent supply current | Extends shelf life and operational runtime in energy-constrained IoT edge nodes and portable meters. |
| VCC/BATT switchover with 40mV hysteresis | Prevents chattering during slow VCC decay, ensuring single, clean transition to backup power. |
| 3.08V precision reset threshold (±1.5%) | Matches 3.3V system tolerance bands, eliminating need for external resistor dividers or calibration. |
| Open-drain active-high RESET output | Allows wired-OR configuration with other supervisors and flexible pull-up to any valid logic rail (VCC or OUT). |
Applications
| POS Terminal Power Management | Industrial PLC Memory Protection |
|---|---|
Use Scenario: Battery-backed receipt printer and cash drawer controller operating on 3.3V main supply with CR2032 coin cell backup. IC Role / Device Role / Timing Role: Supervises 3.3V rail, triggers watchdog reset on firmware freeze, gates SRAM CE during brownout, and switches memory power to battery. Use Value: Prevents transaction data loss during AC outage and ensures deterministic recovery after power restoration. |
Use Scenario: Programmable logic controller maintaining real-time clock and configuration EEPROM during factory floor power dips. IC Role / Device Role / Timing Role: Monitors 3.3V I/O supply, asserts RESET on undervoltage, isolates memory bus via CE gating, and sustains RTC power from backup battery. Use Value: Guarantees nonvolatile memory integrity and eliminates reconfiguration after transient grid disturbances. |
| Portable Medical Monitor | Smart Energy Meter |
Use Scenario: Handheld ECG device with Li-ion battery and 3.3V system rail, requiring continuous sensor data logging during battery swap. IC Role / Device Role / Timing Role: Detects 3.08V brownout, initiates graceful shutdown sequence, gates flash memory writes, and maintains RAM contents via BATT switchover. Use Value: Enables hot-swap battery replacement without losing critical patient waveform history. |
Use Scenario: Revenue-grade electricity meter with tamper-resistant EEPROM and RTC, powered by mains and supercapacitor backup. IC Role / Device Role / Timing Role: Watches 3.3V supply derived from isolated DC/DC, triggers watchdog on communication stack stall, and enables write-protection during voltage sag. Use Value: Meets IEC 62053-21 data retention requirements under 200ms interruptions with zero firmware overhead. |
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 3.08V threshold and watchdog, but push-pull active-low RESET output instead of open-drain active-high. | Requires external pull-up for high-level signaling; incompatible with wired-OR reset buses or level-shifting interfaces. | Select when interfacing with legacy µPs requiring active-low reset and no shared reset lines. |
| TPS3808G33DBVR | 3.3V fixed threshold, no watchdog, 350ms reset timeout, 2.5µA IQ, SOT23-6 package. | Lacks battery switchover, CE gating, and watchdog-suitable only for basic reset-only functions. | Choose for cost-sensitive, space-constrained designs where backup power and memory protection are not required. |
Compared with MAX6366HKA31+T, MAX6366PKA31+T offers identical supervision and timing but differs in reset polarity and drive type, while TPS3808G33DBVR reduces functionality to basic voltage monitoring-making it unsuitable for applications needing battery backup or watchdog safety enforcement.
Availability
MAX6366HKA31+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLCs, smart energy meters, and POS terminals requiring stable component supply across extended production lifecycles.
Supply support for MAX6366HKA31+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 connectivity in demanding environments.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated reset, watchdog, battery switchover, and memory write protection-all in a single 8-pin SOT23 package.
FAQ
What is the exact reset threshold voltage of MAX6366HKA31+T?
The MAX6366HKA31+T has a factory-preset reset threshold of 3.08V, with guaranteed minimum and maximum values of 3.00V and 3.15V respectively across −40°C to +85°C. This threshold is laser-trimmed during production and does not require external components or calibration.
Does MAX6366HKA31+T support battery-backup operation with lithium coin cells?
Yes, MAX6366HKA31+T supports battery-backup operation with standard 3V lithium coin cells (e.g., CR2032). When VCC drops below 3.08V and falls 20mV below VBATT, the device automatically switches OUT to the battery, drawing only 3µA typical backup current at 2.8V to maximize battery life.
How does the watchdog function work in MAX6366HKA31+T?
The MAX6366HKA31+T watchdog requires periodic edges on the WDI pin; if no rising or falling edge occurs for longer than 1.6s (typ.), it triggers a RESET pulse lasting ≥150ms. The timer resets on every WDI transition, enabling robust detection of software hangs without requiring precise timing windows.
Can MAX6366HKA31+T be used without a backup battery?
Yes, MAX6366HKA31+T operates fully without a backup battery: connect BATT to GND and tie OUT directly to VCC. All supervision, watchdog, and CE gating functions remain active; only battery switchover and backup power delivery are disabled.
What is the purpose of CE IN and CE OUT pins on MAX6366HKA31+T?
The CE IN and CE OUT pins implement hardware write protection: during normal operation, CE IN passes through to CE OUT with 1.5ns delay; when RESET asserts, CE OUT is gated to prevent spurious memory writes during power instability-critical for preserving SRAM and EEPROM data integrity.
MAX6366HKA31+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6366HKA31+T FAQ
1.How can I place an order for MAX6366HKA31+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366HKA31+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 MAX6366HKA31+T reliable?
The price and inventory of MAX6366HKA31+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366HKA31+T is usually 5 days.
3.What payment methods are accepted for MAX6366HKA31+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366HKA31+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366HKA31+T?
MAX6366HKA31+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366HKA31+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 MAX6366HKA31+T?
For technical support, including MAX6366HKA31+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366HKA31+T requirements.
6.How does Aetrix verify that MAX6366HKA31+T is sourced from the original manufacturer or authorized distributors?
All MAX6366HKA31+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 MAX6366HKA31+T meets industry standards.
7.What is the process for return or replacement of MAX6366HKA31+T?
All MAX6366HKA31+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366HKA31+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 MAX6366HKA31+T part is unused and in its original packaging.
Return procedure for MAX6366HKA31+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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