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Analog Devices Inc./Maxim Integrated MAX6366LKA29+T
- Part No.:
- MAX6366LKA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366LKA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,537
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Product details
Overview
The MAX6366LKA29+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 ±70mV), asserts active-high open-drain RESET on power failure or watchdog timeout, supports 1.2V to 5.5V operation, and delivers up to 150mA from VCC or backup battery. It is used in portable equipment requiring reliable brownout protection and nonvolatile memory retention during main power loss.
For engineers reviewing the MAX6366LKA29+T datasheet, MAX6366LKA29+T pinout, MAX6366LKA29+T application, or MAX6366LKA29+T equivalent, key selection criteria include its 1.6s watchdog timeout, 150ms minimum reset timeout, 2.93V factory-set reset threshold, 10µA quiescent current, and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6366LKA29+T implements a dedicated watchdog timer with 1.6s nominal timeout (1.0–2.25s over temperature), triggered by absence of WDI edge transitions. Its reset generator asserts an active-high open-drain output for ≥150ms after VCC recovery or watchdog timeout.
Battery switchover uses a MOSFET-based analog switch with 40mV hysteresis between VCC and VBATT, enabling seamless transition to backup power when VCC falls below both the 2.93V threshold and VBATT. Chip-enable gating provides 1.5ns propagation delay and <100Ω on-resistance between CE IN and CE OUT during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±70mV - guarantees reliable detection of VCC brownout at +3.3V or +2.5V logic rails |
| Watchdog Timeout | 1.6s (1.0–2.25s) - provides sufficient margin for firmware execution loops without false triggers |
| Reset Timeout Period | ≥150ms - ensures µP completes full power-up initialization before release |
| Quiescent Current | 10µA (typ) - enables multi-year battery life in always-on backup mode |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with ultra-low-voltage µPs and legacy 5V systems |
| Output Type | Active-high open-drain RESET - allows wired-OR configuration and level-shifting flexibility |
| Battery Switchover Hysteresis | 40mV - prevents oscillation during slow VCC decay near VBATT |
Pinout & Package
MAX6366LKA29+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, watchdog timeout, or MR/WDI fault; requires external pull-down for logic-low default |
| 2: CE IN | Chip-enable input | Directly gates CE signal path to SRAM; held low to disable writes during power faults |
| 3: GND | Ground reference | Common return for all internal circuits and external decoupling |
| 4: WDI | Watchdog input | Edge-sensitive trigger - rising/falling edges reset internal 1.6s timer; static high/low for >1.6s forces reset pulse |
| 5: VCC | Main supply input | Powers device and supplies OUT during normal operation; monitored for reset threshold violation |
| 6: OUT | Power output | Sources from VCC (≤150mA) or BATT (≤40mA) depending on switchover state; powers SRAM or real-time clock |
| 7: BATT | Backup battery input | Provides hold-up power when VCC fails; must exceed VCC by ≥20mV to engage switchover |
| 8: CE OUT | Chip-enable output | Passes CE IN signal only when reset is deasserted; clamped low for 12µs if CE IN is low at reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Integrated watchdog timer | 1.6s timeout with edge-triggered reset - eliminates need for external timing components and reduces firmware complexity |
| Chip-enable gating with 1.5ns delay | Prevents erroneous SRAM writes during power transients without adding latency to normal read/write cycles |
| Battery switchover with 40mV hysteresis | Ensures stable RAM retention during slow VCC decay without chattering or premature switching |
| 10µA supply current in active mode | Extends battery life in backup applications where device remains powered continuously |
| Factory-trimmed 2.93V reset threshold | Eliminates external resistor networks for +3.3V system monitoring, improving accuracy and board area efficiency |
Applications
| Portable Medical Monitor | Industrial PLC I/O Module |
|---|---|
Use Scenario: Battery-powered patient monitor retains real-time vital sign data during AC power interruption. IC Role / Device Role / Timing Role: Supervisory IC maintains SRAM power via BATT, asserts RESET to halt µP during brownout, and gates CE to prevent corrupted ECG waveform storage. Use Value: Guarantees data integrity across power transitions using 2.93V threshold aligned with 3.3V system rail and 150ms reset hold time for safe µP shutdown. | Use Scenario: Remote I/O node preserves configuration registers and process state during field power dips. IC Role / Device Role / Timing Role: MAX6366LKA29+T monitors 3.3V backplane supply, triggers watchdog reset if µC hangs, and switches SRAM to coin-cell backup. Use Value: 1.6s watchdog timeout matches typical control loop duration; 10µA quiescent current enables >5-year coin-cell life in maintenance-free deployments. |
| POS Terminal with Flash Memory | Smart Energy Meter |
Use Scenario: Retail terminal safeguards transaction logs and encryption keys during unexpected mains dropout. IC Role / Device Role / Timing Role: Acts as power-fail supervisor: disables flash write enable via CE gating, asserts RESET to freeze µP, and sustains SRAM from backup battery. Use Value: 1.5ns CE propagation delay ensures no spurious writes occur during fast power collapse; 40mV switchover hysteresis avoids glitches on noisy 24VDC inputs. | Use Scenario: Meter retains time-of-use billing data and tamper logs during grid instability or battery replacement. IC Role / Device Role / Timing Role: Monitors 3.3V RTC supply, initiates watchdog reset on firmware stall, and isolates meter RAM from failing supply using CE OUT control. Use Value: Factory-set 2.93V threshold matches LiSOCl₂ battery discharge profile; 150ms reset timeout exceeds EEPROM write cycle time for atomic log commits. |
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 threshold and watchdog function, but push-pull active-low RESET output instead of open-drain active-high | Requires redesign of reset net termination; incompatible with wired-OR or level-shifted reset buses | Select when system demands active-low reset polarity and no external pull-up is desired |
| TPS3808G33DBVR | 3.3V fixed reset threshold, no watchdog or battery switchover; 350ms reset timeout; SOT23-6 package | Lacks memory write protection, backup power management, and watchdog - suitable only for basic reset-only use cases | Choose only if application requires only supply monitoring without battery backup or CE gating |
Compared with MAX6366PKA29+T and TPS3808G33DBVR, the MAX6366LKA29+T uniquely integrates watchdog supervision, battery-backed SRAM power control, and chip-enable gating in a single SOT23-8 package - eliminating three discrete functions and reducing BOM count by 2–4 components in portable and industrial µP systems.
Availability
MAX6366LKA29+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, POS terminals with flash memory, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6366LKA29+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 systems needing integrated power supervision, battery backup, and memory write protection - targeting space-constrained, battery-operated, and mission-critical embedded platforms.
FAQ
What is the exact reset threshold voltage for MAX6366LKA29+T?
The MAX6366LKA29+T has a factory-trimmed reset threshold of 2.93V, with guaranteed limits of 2.85V (min) and 3.00V (max) over temperature. This value is laser-trimmed during production and applies to VCC monitoring under all operating conditions specified in the datasheet. The MAX6366LKA29+T does not require external resistors to set this threshold.
Does MAX6366LKA29+T support battery-backup operation with lithium coin cells?
Yes, MAX6366LKA29+T supports lithium coin-cell backup (e.g., CR2032) via the BATT pin. It draws only 3µA typical in battery-backup mode (VBATT = 2.8V, VCC = 0V), enabling multi-year operation. The device requires VBATT to exceed VCC by at least 20mV to engage switchover, and features 40mV hysteresis to prevent oscillation during slow discharge.
How does the watchdog timer in MAX6366LKA29+T operate?
The MAX6366LKA29+T watchdog timer resets on any rising or falling edge at the WDI pin. If WDI remains static (high or low) for longer than 1.6s (1.0–2.25s range), it triggers a RESET pulse lasting ≥150ms. The timer clears immediately on each WDI transition, making it suitable for periodic firmware "kick" routines. No external components are needed - the MAX6366LKA29+T implements the entire timing function internally.
Can MAX6366LKA29+T be used without a backup battery?
Yes, MAX6366LKA29+T operates fully 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 active. The device will assert RESET during VCC brownout but cannot sustain SRAM power during main supply loss.
What is the purpose of the CE IN and CE OUT pins on MAX6366LKA29+T?
The CE IN and CE OUT pins implement hardware write-protection for CMOS RAM or flash memory. During normal operation, CE IN passes directly to CE OUT with 1.5ns delay. When RESET asserts, CE OUT is forced low (if CE IN was low) or held high (if CE IN was high), preventing spurious writes during power faults. This feature is integral to the MAX6366LKA29+T and requires no external logic.
MAX6366LKA29+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:
- Push-Pull, Totem Pole
- 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
MAX6366LKA29+T FAQ
1.How can I place an order for MAX6366LKA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366LKA29+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 MAX6366LKA29+T reliable?
The price and inventory of MAX6366LKA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366LKA29+T is usually 5 days.
3.What payment methods are accepted for MAX6366LKA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366LKA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366LKA29+T?
MAX6366LKA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366LKA29+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 MAX6366LKA29+T?
For technical support, including MAX6366LKA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366LKA29+T requirements.
6.How does Aetrix verify that MAX6366LKA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6366LKA29+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 MAX6366LKA29+T meets industry standards.
7.What is the process for return or replacement of MAX6366LKA29+T?
All MAX6366LKA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366LKA29+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 MAX6366LKA29+T part is unused and in its original packaging.
Return procedure for MAX6366LKA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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