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Analog Devices Inc./Maxim Integrated MAX6366HKA29+T
- Part No.:
- MAX6366HKA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366HKA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
The MAX6366HKA29+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 = 2.93V typ), asserts an open-drain active-high RESET output on power failure or watchdog timeout, and switches OUT between VCC and backup battery (VBATT) with 40mV hysteresis. Used in portable POS terminals and industrial controllers requiring reliable brownout protection and nonvolatile memory retention.
For engineers reviewing the MAX6366HKA29+T datasheet, MAX6366HKA29+T pinout, MAX6366HKA29+T application, or MAX6366HKA29+T equivalent, this page delivers verified functional identity, exact reset threshold (2.85–3.00V), watchdog timeout (1.00–2.25s), battery-switching behavior, CE gating propagation delay (2–9ns), and SOT23-8 package mapping - all confirmed from Maxim's official datasheet Rev 5.
Technical Context
The MAX6366HKA29+T implements a precision voltage monitor with factory-trimmed 2.93V reset threshold (±7mV over temperature), a 1.6s nominal watchdog timer that triggers pulsed RESET on WDI stall, and bidirectional VCC/BATT switchover controlled by internal MOSFETs with <4.6Ω on-resistance at 2.38V. Its CE IN-to-CE OUT transmission gate enables real-time chip-enable signal gating during reset events.
RESET is open-drain active-high and guaranteed valid down to 1.2V VCC or VBATT; the watchdog clears on any WDI edge (rising/falling) or reset assertion. Battery-backup mode activates only when both VCC < VTH and VCC < (VBATT − 20mV), preventing chatter during slow VCC decay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.85V to 3.00V (factory-set for 2.93V typ); ensures reliable detection of +3.3V supply brownout before logic corruption. |
| Watchdog Timeout | 1.00s to 2.25s (1.6s typ); provides fail-safe µP recovery if firmware hangs longer than system-critical timeout. |
| Supply Current | 10µA to 50µA (at VCC > VTH); enables multi-year battery life in always-on backup applications. |
| VCC-to-OUT On-Resistance | 4.6Ω max at VCC = 2.38V, IOUT = 25mA; minimizes voltage drop and power loss during main-supply operation. |
| CE IN to CE OUT Delay | 2ns to 9ns (50Ω source, 50pF load); supports high-speed µP/DSP interfaces without timing violation. |
| Battery-Backup Quiescent Current | 3µA max (TA = −40°C to +85°C); preserves backup battery charge during extended power-loss events. |
| Reset Timeout Period | 150ms to 280ms; guarantees sufficient µP initialization time after VCC recovery. |
Pinout & Package
MAX6366HKA29+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), lead(Pb)-free, RoHS-compliant, with moisture sensitivity level (MSL) 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Open-drain active-high reset output | Asserts high during VCC undervoltage, WDI timeout, or MR/RESET IN fault; requires external pull-down for logic-low default state. |
| 2 CE IN | Chip-enable input | Directly gates CE signal path to CMOS RAM; held low during reset to prevent write corruption. |
| 3 GND | Ground reference | Common return for VCC, BATT, and digital logic; must be low-impedance for accurate threshold sensing. |
| 4 WDI | Watchdog input | Edge-triggered (rising/falling); resets internal timer on each transition; 100ns minimum pulse width required. |
| 5 VCC | Main supply input | Operates from 1.2V to 5.5V; powers internal circuitry and sources OUT up to 150mA when above VTH. |
| 6 OUT | Switched output | Connects to SRAM VDD; sourced from VCC (normal) or BATT (backup); 1.5ns CE gating propagation delay. |
| 7 BATT | Backup battery input | Accepts 0V to 6V; automatically engages when VCC < (VBATT − 20mV) and VCC < VTH; 40mV hysteresis prevents oscillation. |
| 8 CE OUT | Chip-enable output | Passes CE IN when reset inactive; forced low for 12µs if CE IN is low at reset assertion to complete ongoing memory access. |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with 1.6s timeout | Enables autonomous µP recovery without software intervention; clears on any WDI edge, eliminating false triggers from noise. |
| Factory-trimmed 2.93V reset threshold | Guarantees precise detection of +3.3V rail collapse (±7mV over −40°C to +85°C), avoiding premature or delayed reset assertion. |
| VCC/BATT switchover with 40mV hysteresis | Prevents rapid toggling during slow VCC decay; ensures stable SRAM power during brownout transitions. |
| 1.5ns CE gating propagation delay | Supports high-speed µP address/data buses without violating setup/hold timing for memory writes. |
| 10µA quiescent current (VCC > VTH) | Extends battery life in portable equipment; reduces thermal load in space-constrained embedded designs. |
| Open-drain active-high RESET | Allows wired-OR configuration with other reset sources; compatible with µP reset inputs requiring active-high assertion. |
Applications
| POS Terminal Power Management | Industrial PLC Memory Backup |
|---|---|
Use Scenario: Portable point-of-sale terminal operating on Li-ion battery with intermittent AC adapter connection. IC Role / Device Role / Timing Role: Supervises 3.3V main rail, triggers watchdog reset if payment processing stalls, and switches SRAM to battery during AC dropout. Use Value: Prevents transaction data loss during power interruption; maintains RAM contents for ≥10 years on coin-cell backup. |
Use Scenario: Programmable logic controller in factory automation with volatile configuration RAM. IC Role / Device Role / Timing Role: Monitors 5V system rail, asserts RESET on brownout, gates CE to halt writes during fault, and sustains SRAM via backup battery. Use Value: Eliminates need for external backup diodes and discrete gating logic; reduces BOM count by 4 components. |
| Medical Handheld Diagnostic Device | Smart Energy Meter Data Retention |
Use Scenario: Battery-powered handheld ultrasound device requiring FDA-compliant power-fail response. IC Role / Device Role / Timing Role: Provides 150ms minimum reset hold time after VCC recovery and watchdog supervision of ARM Cortex-M4 firmware. Use Value: Meets IEC 62304 Class C software safety requirements for deterministic reset behavior under transient faults. |
Use Scenario: Utility meter with EEPROM and RTC, deployed in environments with frequent grid fluctuations. IC Role / Device Role / Timing Role: Detects 2.93V threshold crossing on 3.3V supply, gates CE during reset, and powers RTC/SRAM from backup cell. Use Value: Guarantees 10-year data retention at −40°C to +85°C with <3µA battery drain in backup mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA29+T | Same 2.93V reset threshold and watchdog, but push-pull active-low RESET output instead of open-drain active-high. | Requires redesign of reset net termination; incompatible with systems needing active-high assertion or wired-OR reset bus. | Select only if µP reset input is active-low and no shared reset bus exists. |
| TPS3808G33DBVR | 3.3V fixed reset threshold (not adjustable), no watchdog or battery switchover; 350ms reset timeout vs. 150ms min. | Lacks battery backup, CE gating, and watchdog - suitable only for basic power-monitoring, not memory-retention systems. | Choose only for cost-sensitive, non-battery-backed applications where watchdog and backup features are unnecessary. |
Compared with MAX6366HKA29+T, MAX6366PKA29+T offers identical monitoring and timing but different reset polarity and drive type, while TPS3808G33DBVR omits critical battery-backup and watchdog functionality - making it unsuitable for SRAM retention or autonomous recovery use cases.
Availability
MAX6366HKA29+T is available at Aetrix Electronics and suitable for portable POS terminals, industrial PLCs, medical handheld diagnostics, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed lead(Pb)-free compliance.
Supply support for MAX6366HKA29+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and computing applications.
The MAX6365–MAX6368 family was designed specifically for µP-based systems needing integrated power supervision, battery backup, and memory write protection - targeting space-constrained, battery-sensitive applications like portable instrumentation and embedded controllers.
FAQ
What is the exact reset threshold voltage of the MAX6366HKA29+T?
The MAX6366HKA29+T has a factory-trimmed reset threshold of 2.85V (min), 2.93V (typ), and 3.00V (max) over temperature. This range is specified in the Reset Threshold Ranges table of the datasheet and applies directly to the MAX6366HKA29+T marking code "AAAW". The threshold is guaranteed across −40°C to +85°C with ±7mV typical drift.
Does the MAX6366HKA29+T support battery-backup switchover, and what are the activation conditions?
Yes, the MAX6366HKA29+T supports automatic battery-backup switchover. It engages backup mode only when two conditions are met simultaneously: VCC falls below the 2.93V reset threshold AND VCC drops at least 20mV below VBATT. This dual-condition logic, with 40mV hysteresis, prevents oscillation during slow VCC decay and ensures clean transition to battery power for SRAM retention.
What is the watchdog timeout behavior of the MAX6366HKA29+T, and how is it cleared?
The MAX6366HKA29+T features a watchdog timer with a nominal 1.6s timeout (1.00–2.25s range). It is cleared on every rising or falling edge at the WDI pin - not just periodic pulses - enabling robust firmware supervision. If WDI remains static beyond the timeout, a pulsed RESET output is generated for the full 150–280ms reset period. The timer also resets automatically whenever RESET is asserted.
Can the MAX6366HKA29+T be used without a backup battery?
Yes, the MAX6366HKA29+T operates fully without a backup battery. In such configurations, connect the BATT pin to GND and tie OUT directly to VCC. All supervision, watchdog, and CE gating functions remain active. The device draws only 10–50µA quiescent current, making it suitable for mains-powered systems where battery backup is optional or unused.
What package type and pin compatibility does the MAX6366HKA29+T have?
The MAX6366HKA29+T uses an 8-pin SOT23 package (2.9mm × 1.6mm footprint) with standard pinout matching the entire MAX6365–MAX6368 family. Pin 1 is RESET, Pin 2 is CE IN, Pin 3 is GND, Pin 4 is WDI, Pin 5 is VCC, Pin 6 is OUT, Pin 7 is BATT, and Pin 8 is CE OUT. It is pin-compatible with all variants in the series, differing only in function (e.g., WDI vs. MR vs. RESET IN) and reset output type.
MAX6366HKA29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX6366HKA29+T FAQ
1.How can I place an order for MAX6366HKA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366HKA29+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 MAX6366HKA29+T reliable?
The price and inventory of MAX6366HKA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366HKA29+T is usually 5 days.
3.What payment methods are accepted for MAX6366HKA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366HKA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366HKA29+T?
MAX6366HKA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366HKA29+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 MAX6366HKA29+T?
For technical support, including MAX6366HKA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366HKA29+T requirements.
6.How does Aetrix verify that MAX6366HKA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6366HKA29+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 MAX6366HKA29+T meets industry standards.
7.What is the process for return or replacement of MAX6366HKA29+T?
All MAX6366HKA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366HKA29+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 MAX6366HKA29+T part is unused and in its original packaging.
Return procedure for MAX6366HKA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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