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Analog Devices Inc./Maxim Integrated MAX6366PKA23-T
- Part No.:
- MAX6366PKA23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366PKA23-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6366PKA23-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 supply voltage (reset threshold = 2.32V), asserts an open-drain active-low RESET output during power-up/down/brownout, provides 1.6s watchdog timeout, and switches OUT between VCC and backup battery (VBATT) with 40mV hysteresis. It is used in portable equipment requiring reliable power monitoring and data retention during main supply failure.
For engineers reviewing the MAX6366PKA23-T datasheet, MAX6366PKA23-T pinout, MAX6366PKA23-T application, or MAX6366PKA23-T equivalent, key selection criteria include its 2.32V factory-set reset threshold, 1.6s watchdog timeout, 8-pin SOT23 package, 10µA quiescent current, and support for battery-backed CMOS RAM write protection in space-constrained embedded systems.
Technical Context
The MAX6366PKA23-T implements a dedicated watchdog timer with 1.6s timeout (±35% over temperature), triggered by absence of edge transitions on WDI. Its reset generator guarantees RESET assertion for ≥150ms after VCC rises above 2.32V, with propagation delay <20µs during VCC fall at 10V/ms.
Battery switchover uses dual-voltage comparison: OUT connects to BATT only when VCC < VTH (2.32V) *and* VCC < VBATT − 20mV; reversion occurs when VCC > VBATT + 20mV. Chip-enable gating features a 20Ω–100Ω transmission gate with 1.5ns typical propagation delay and 12µs reset-to-CE OUT hold time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (factory preset, ±70mV tolerance); ensures reliable reset initiation for 2.5V/3.0V logic rails |
| Watchdog Timeout | 1.6s (typical), 1.0–2.25s range; provides robust software hang detection without excessive false triggers |
| Quiescent Current | 10µA (max at VCC = 5.5V); enables multi-year operation in battery-backed memory retention |
| Reset Timeout Period | 150ms (min), 280ms (max); meets µP power-on reset timing requirements across voltage and temperature |
| VCC Operating Range | 1.2V to 5.5V; supports direct interface with ultra-low-voltage microcontrollers and legacy 5V systems |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration and level-shifting with external pull-up |
| Package | 8-pin SOT23 (2.9mm × 1.6mm); enables high-density PCB layout in portable and industrial control modules |
Pinout & Package
MAX6366PKA23-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm, 0.95mm height) with gull-wing leads, RoHS-compliant and lead(Pb)-free (denoted by "+T" suffix; "-T" indicates leaded version).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Open-drain active-low reset output | Asserts low during VCC brownout, watchdog timeout, or manual reset; requires external pull-up for logic-level compatibility |
| 2: CE IN | Chip-enable input | Directly gates CE signal to SRAM; held low during reset to prevent write corruption; internal 20kΩ pullup if unused |
| 3: GND | Ground reference | Common return path for VCC, BATT, and all I/O; must be low-impedance connection to minimize noise coupling |
| 4: WDI | Watchdog input | Edge-sensitive (rising/falling); resets internal timer on each transition; 100ns minimum pulse width required |
| 5: VCC | Main supply input | Power source for supervisory logic and VCC-to-OUT switch; monitored for reset generation and switchover control |
| 6: OUT | Regulated output | Sources from VCC normally; switches to BATT during backup mode; delivers up to 150mA (VCC) or 25mA (BATT) |
| 7: BATT | Backup battery input | Accepts 2.0V–5.5V battery; enables seamless switchover when VCC drops below VTH and VBATT exceeds VCC by 20mV |
| 8: CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs after reset assertion to complete pending memory access |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog Timer | 1.6s timeout with edge-triggered reset clearance; prevents firmware lockup without CPU intervention |
| Battery Switchover Hysteresis | 40mV (20mV up / 20mV down); eliminates oscillation during slow VCC decay near threshold |
| Chip-Enable Propagation Delay | 1.5ns typical; preserves timing integrity for high-speed µP/SRAM interfaces up to 100MHz |
| Low-Voltage Operation | Functional down to 1.2V VCC or VBATT; supports energy-harvesting and coin-cell powered systems |
| Reset Output Immunity | Guaranteed valid RESET state down to 1.2V; ensures deterministic µP initialization even under deep brownout |
Applications
| Portable Medical Monitor | Industrial PLC Module |
|---|---|
|
Use Scenario: Battery-powered ECG monitor retains real-time waveform buffer during AC power loss. IC Role / Device Role / Timing Role: Supervises 3.3V system rail, triggers watchdog on firmware stall, and switches SRAM supply to coin cell via OUT pin. Use Value: Prevents loss of critical patient data during 200ms–500ms power interruption; 10µA standby current extends battery life to >3 years. |
Use Scenario: DIN-rail mounted controller maintains I/O state and configuration EEPROM during factory mains fluctuation. IC Role / Device Role / Timing Role: Monitors 5.0V VCC, asserts RESET to halt processor during undervoltage, and gates CE to block spurious writes to flash memory. Use Value: Eliminates corrupted firmware updates caused by brownout-induced partial writes; 150ms reset timeout satisfies Intel x86 reset spec. |
| Point-of-Sale Terminal | Smart Energy Meter |
|
Use Scenario: Handheld POS device uses supercapacitor backup to preserve transaction log during hot-swap battery replacement. IC Role / Device Role / Timing Role: Detects VCC drop below 2.32V, activates battery switchover, and holds CE OUT low for 12µs to complete final EEPROM write. Use Value: Enables safe field battery service without transaction loss; 40mV hysteresis prevents chatter during capacitor discharge ramp. |
Use Scenario: Utility meter retains time-of-use billing data and tamper logs during grid outage lasting minutes to hours. IC Role / Device Role / Timing Role: Supervises 3.0V RTC supply, triggers watchdog on metering ASIC freeze, and powers backup SRAM from lithium-thionyl chloride cell. Use Value: Guarantees 10-year data integrity with <1µA battery leakage in backup mode; 2.32V threshold matches LiSOCl₂ end-of-life voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366HKA23-T | Same watchdog and reset functions, but push-pull active-high RESET output instead of open-drain active-low | Requires redesign of RESET pull-up network and µP reset input biasing; incompatible with wired-OR bus topologies | Select when µP reset pin is active-high and no level translation is needed |
| TPS3808G125DBVR | TI part with 1.25V reset threshold, 200ms fixed timeout, no watchdog or battery switchover | Lacks battery backup, chip-enable gating, and watchdog-suitable only for basic power monitoring without data retention | Choose only for cost-sensitive, non-battery-backed applications where 1.25V threshold aligns with system rail |
Compared with MAX6366PKA23-T, MAX6366HKA23-T offers identical supervision functionality but different reset polarity and drive strength, while TPS3808G125DBVR omits critical battery-backup and watchdog features-making it unsuitable for applications requiring data retention or firmware crash recovery.
Availability
MAX6366PKA23-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC modules, point-of-sale terminals, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6366PKA23-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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6365–MAX6368 family was engineered specifically for µP-based systems needing integrated power supervision, battery backup, and memory write protection in minimal footprint-targeting portable, industrial, and metering equipment.
FAQ
What is the exact reset threshold voltage of the MAX6366PKA23-T?
The MAX6366PKA23-T has a factory-trimmed reset threshold of 2.32V (minimum), 2.32V (typical), and 2.38V (maximum) at +25°C, with ±70mV variation over -40°C to +85°C. This precise threshold ensures reliable reset activation for 2.5V logic systems while avoiding nuisance trips during nominal operation. The "23" suffix in MAX6366PKA23-T explicitly denotes this 2.32V rating per Maxim's ordering guide.
Does the MAX6366PKA23-T support battery backup for both VCC and VBATT supply voltages?
Yes, the MAX6366PKA23-T supports battery backup: when VCC falls below 2.32V *and* VBATT exceeds VCC by at least 20mV, the internal MOSFET switches OUT from VCC to VBATT. The device operates from VBATT down to 2.0V and draws only 3µA in backup mode (TA = -40°C to +85°C), enabling multi-year retention in MAX6366PKA23-T–based systems.
How does the watchdog function work on the MAX6366PKA23-T?
The MAX6366PKA23-T watchdog monitors the WDI pin: any rising or falling edge clears the 1.6s timer, while absence of edges longer than 1.0–2.25s triggers a RESET pulse for ≥150ms. WDI accepts TTL/CMOS levels, requires no external components, and tolerates 100ns pulses-enabling robust firmware health checking in MAX6366PKA23-T–equipped microcontrollers without additional hardware.
Can the MAX6366PKA23-T be used without a backup battery?
Yes, the MAX6366PKA23-T operates without a backup battery: connect BATT to GND and tie OUT directly to VCC. All supervision functions-including reset generation, watchdog, and chip-enable gating-remain fully functional. The device draws only 10µA quiescent current in this configuration, making MAX6366PKA23-T suitable for cost-sensitive applications where data retention isn't required.
What is the purpose of the CE IN and CE OUT pins on the MAX6366PKA23-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 forced low for 12µs to complete pending memory accesses, then disconnected and pulled up to OUT. This prevents corrupted writes to SRAM/EEPROM during power faults-critical for reliable operation in MAX6366PKA23-T–based data loggers and controllers.
MAX6366PKA23-T 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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- 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
MAX6366PKA23-T FAQ
1.How can I place an order for MAX6366PKA23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366PKA23-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 MAX6366PKA23-T reliable?
The price and inventory of MAX6366PKA23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366PKA23-T is usually 5 days.
3.What payment methods are accepted for MAX6366PKA23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366PKA23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366PKA23-T?
MAX6366PKA23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366PKA23-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 MAX6366PKA23-T?
For technical support, including MAX6366PKA23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366PKA23-T requirements.
6.How does Aetrix verify that MAX6366PKA23-T is sourced from the original manufacturer or authorized distributors?
All MAX6366PKA23-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 MAX6366PKA23-T meets industry standards.
7.What is the process for return or replacement of MAX6366PKA23-T?
All MAX6366PKA23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366PKA23-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 MAX6366PKA23-T part is unused and in its original packaging.
Return procedure for MAX6366PKA23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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