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Analog Devices Inc./Maxim Integrated MAX6366PKA29+T
- Part No.:
- MAX6366PKA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366PKA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,896
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Product details
Overview
MAX6366PKA29+T 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-low open-drain RESET on power-up/down/brownout or watchdog timeout, provides 2.93V factory-set reset threshold, and supports 150ms minimum reset timeout. It is used in portable equipment requiring reliable µP reset and SRAM data retention during main supply failure.
For engineers reviewing the MAX6366PKA29+T datasheet, MAX6366PKA29+T pinout, MAX6366PKA29+T application, or MAX6366PKA29+T equivalent, key selection criteria include its 1.6s watchdog timeout, 2.93V ±70mV reset threshold, 10µA quiescent current, open-drain active-low RESET output, and SOT23-8 package compatibility with space-constrained embedded systems.
Technical Context
The MAX6366PKA29+T implements a precision voltage monitor with internal 2.93V reference, a 1.6s watchdog timer that triggers RESET pulses upon WDI inactivity, and a bidirectional VCC/BATT switchover path with 40mV hysteresis. Its CE IN-to-CE OUT transmission gate enables chip-enable signal gating with 1.5ns propagation delay and 20–100Ω on-resistance.
It operates across -40°C to +85°C, guarantees RESET assertion down to 1.2V VCC or VBATT, and features glitch-immune WDI input with 100ns minimum pulse width detection. The device uses an internal MOSFET for battery switchover and includes debounced manual reset logic only in MAX6365 variants - not applicable here.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±70mV - ensures reliable reset assertion when VCC drops below nominal 3.0V supply |
| Watchdog Timeout | 1.6s (typ) - provides sufficient margin to detect µP lockup without false triggering |
| Quiescent Current | 10µA (typ) - enables multi-year battery life in backup mode for portable applications |
| Reset Timeout Period | 150ms min - meets µP power-on reset timing requirements for stable initialization |
| Operating Voltage | 1.2V to 5.5V - supports direct interface with 1.2V, 1.8V, 2.5V, 3.3V, and 5.0V logic domains |
| Output Type | Open-drain active-low RESET - allows wired-OR configuration and level-shifting flexibility |
| Battery Switchover | VCC–VBATT hysteresis = 40mV - prevents oscillation during slow VCC decay near backup threshold |
Pinout & Package
MAX6366PKA29+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts in portable and industrial control systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-high open-drain reset output | Asserts high during VCC brownout, watchdog timeout, or reset condition; requires external pull-down for active-low logic |
| 2: CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write access during power fault |
| 3: GND | Ground reference | Common return path for all internal circuits and output drivers |
| 4: WDI | Watchdog input | Edge-sensitive input; rising/falling edges reset 1.6s timer; inactivity triggers RESET pulse |
| 5: VCC | Main supply input | Powers device and supplies OUT during normal operation; monitored for reset generation |
| 6: OUT | Power output | Sources from VCC normally; switches to BATT during backup mode to sustain SRAM/RTC |
| 7: BATT | Backup battery input | Provides hold-up power when VCC falls below threshold; must exceed VCC by ≥20mV to engage |
| 8: CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs after reset assertion to complete memory access |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog Timer | 1.6s timeout with edge-triggered reset - detects µP firmware hangs without software polling overhead |
| Chip-Enable Gating | 1.5ns propagation delay and <100Ω on-resistance - preserves high-speed µP/SRAM timing integrity during fault conditions |
| Battery Switchover | Automatic VCC/BATT switching with 40mV hysteresis - eliminates need for external diode-or or PMOS controllers |
| Low-Voltage Operation | 1.2V guaranteed RESET/RESET validity - ensures reset functionality even under deep brownout or single-cell Li-ion discharge |
| Supply Current | 10µA typical ICC - reduces standby power in always-on battery-backed systems |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Battery-powered handheld ECG device retains real-time waveform buffer and clock during AC power loss. IC Role / Device Role / Timing Role: Supervisory IC asserts RESET to halt µP execution, gates CE to prevent SRAM corruption, and switches OUT to backup battery. Use Value: Ensures deterministic restart and zero data loss using 2.93V threshold aligned with 3.0V system rail and 1.6s watchdog to catch firmware stalls. | Use Scenario: Remote I/O node maintains configuration EEPROM and RTC during 24VDC supply interruption. IC Role / Device Role / Timing Role: Monitors 3.3V logic rail; triggers RESET on brownout; enables CE gating to block spurious writes during voltage sag. Use Value: 150ms reset timeout satisfies industrial µC reset spec; 10µA IBACK extends supercapacitor hold-up time by >30%. |
| Point-of-Sale Terminal | Smart Energy Meter |
Use Scenario: Credit card reader retains transaction log and secure key storage during brief mains dropout. IC Role / Device Role / Timing Role: Provides watchdog supervision of payment processing firmware and battery-backed SRAM write protection. Use Value: WDI input tied to µP GPIO ensures immediate recovery from frozen UI thread; open-drain RESET interfaces cleanly with existing reset controller. | Use Scenario: Meter continues timestamping and tamper logging during AC failure using onboard coin cell. IC Role / Device Role / Timing Role: Supplies regulated 3.0V-equivalent to RTC and nonvolatile memory via BATT-to-OUT path. Use Value: 2.93V reset threshold matches 3.0V LDO output tolerance; 40mV switchover hysteresis prevents chatter during slow grid recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366HKA29+T | Same 2.93V threshold and watchdog, but push-pull active-high RESET output | Requires redesign of reset net termination; incompatible with wired-OR or level-shifted reset buses | Select when system demands active-high push-pull drive without external pull-up |
| TPS3808G33DBVR | 3.3V fixed threshold, no watchdog, 350ms reset timeout, 2.5µA IQ | Lacks battery switchover and CE gating; suitable only for basic reset monitoring | Choose for ultra-low-power cost-sensitive designs where watchdog and backup features are unnecessary |
Compared with MAX6366HKA29+T and TPS3808G33DBVR, the MAX6366PKA29+T uniquely combines open-drain active-low RESET, integrated 1.6s watchdog, and battery-backed SRAM support in a single SOT23-8 package - enabling compact, fail-safe µP systems without discrete backup circuitry.
Availability
MAX6366PKA29+T 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 and long-term lifecycle support.
Supply support for MAX6366PKA29+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, sensing, and connectivity in demanding environments.
The MAX6365–MAX6368 family delivers integrated µP supervision with battery backup and chip-enable gating, targeting space-constrained, battery-sensitive applications like portable instrumentation and industrial edge nodes.
FAQ
What is the factory-set reset threshold voltage for MAX6366PKA29+T?
The MAX6366PKA29+T has a factory-set reset threshold of 2.93V, with a guaranteed range of 2.85V to 3.00V over temperature. This value is laser-trimmed during production and applies to VCC monitoring; it ensures reliable reset assertion when the 3.0V system rail drops below specification. The threshold is specified in the Reset Threshold Ranges table and confirmed in the Electrical Characteristics section of the MAX6366PKA29+T datasheet.
Does MAX6366PKA29+T support battery-backup operation, and what are the switchover conditions?
Yes, MAX6366PKA29+T supports automatic battery-backup operation. Switchover engages when two conditions are met: VCC falls below the 2.93V reset threshold, and VBATT exceeds VCC by at least 20mV. The device then connects BATT to OUT to sustain SRAM or RTC. A 40mV hysteresis prevents oscillation during slow VCC decay. The MAX6366PKA29+T does not power up from BATT alone - initial startup requires VCC.
What is the watchdog timeout period of MAX6366PKA29+T, and how is it triggered?
The MAX6366PKA29+T features a 1.6s typical watchdog timeout period (1.00s to 2.25s over temperature). It is triggered when the WDI input remains static - either high or low - beyond this interval. Each rising or falling edge on WDI resets the timer. The watchdog generates a pulsed active-high RESET signal for the full 150ms reset timeout period. This behavior is intrinsic to the MAX6366PKA29+T and does not require external components.
What output type does MAX6366PKA29+T use for its RESET signal?
The MAX6366PKA29+T uses an open-drain active-high RESET output (pin 1). It pulls high only when asserted; otherwise, it presents high impedance. An external pull-down resistor is required to generate an active-low logic signal if needed by the host µP. This configuration enables wired-OR reset busing and voltage-level translation - a key design advantage of the MAX6366PKA29+T over push-pull alternatives.
Can MAX6366PKA29+T be used without a backup battery?
Yes, MAX6366PKA29+T can operate without a backup battery. In this configuration, connect BATT to GND and tie OUT directly to VCC. All supervision functions - including VCC monitoring, RESET generation, watchdog, and CE gating - remain fully operational. The battery switchover path is disabled, but the MAX6366PKA29+T continues to provide robust power-on reset, brownout protection, and firmware supervision in standalone applications.
MAX6366PKA29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- 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
MAX6366PKA29+T FAQ
1.How can I place an order for MAX6366PKA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366PKA29+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 MAX6366PKA29+T reliable?
The price and inventory of MAX6366PKA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366PKA29+T is usually 5 days.
3.What payment methods are accepted for MAX6366PKA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366PKA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366PKA29+T?
MAX6366PKA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366PKA29+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 MAX6366PKA29+T?
For technical support, including MAX6366PKA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366PKA29+T requirements.
6.How does Aetrix verify that MAX6366PKA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6366PKA29+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 MAX6366PKA29+T meets industry standards.
7.What is the process for return or replacement of MAX6366PKA29+T?
All MAX6366PKA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366PKA29+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 MAX6366PKA29+T part is unused and in its original packaging.
Return procedure for MAX6366PKA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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