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Analog Devices Inc./Maxim Integrated MAX6366LKA23+T
- Part No.:
- MAX6366LKA23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366LKA23+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,572
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Product details
Overview
MAX6366LKA23+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 active-high open-drain RESET on power failure or 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 brownout protection.
For engineers reviewing the MAX6366LKA23+T datasheet, MAX6366LKA23+T pinout, MAX6366LKA23+T application, or MAX6366LKA23+T equivalent, key selection criteria include its 1.6s watchdog timeout, 2.32V factory-trimmed reset threshold, 8-pin SOT23 package, battery-switchover hysteresis (±20mV), and guaranteed RESET/RESET validity down to 1.2V during backup mode.
Technical Context
The MAX6366LKA23+T integrates a precision voltage monitor, 1.6s watchdog timer with edge-triggered clear logic, bidirectional VCC/BATT switchover MOSFET control, and CE signal gating with 1.5ns propagation delay. Its internal 20kΩ MR pullup is unused (MAX6366 variant), and WDI input responds to rising/falling edges or pulses ≥100ns to reset the watchdog timer.
Reset assertion occurs when VCC falls below 2.32V, when WDI remains static >1.65s, or during power-up/brownout; RESET remains asserted for ≥150ms after VCC recovers. The device operates across -40°C to +85°C with <10µA quiescent current and maintains functional RESET output down to 1.2V supply or battery voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (factory-trimmed, ±0.06V tolerance) - ensures reliable detection of 2.5V system brownout |
| Watchdog Timeout | 1.6s (typical, 1.0–2.25s over temp) - provides sufficient margin for firmware execution loops without false triggers |
| Supply Voltage Range | 1.2V to 5.5V - enables direct interface with 1.2V logic, 2.5V/3.3V/5V rails, and battery-backed SRAM |
| Quiescent Current | 10µA (max at +25°C) - minimizes standby power draw in battery-critical applications |
| Reset Timeout Period | 150ms (min) - meets µP reset hold-time requirements for stable initialization |
| VCC-to-OUT On-Resistance | 4.6Ω (at 2.38V, 25mA) - limits voltage drop and power loss during main-supply operation |
| Battery-Backup Current | 3µA (max at -40°C to +85°C) - preserves battery life for multi-year backup operation |
Pinout & Package
MAX6366LKA23+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead(Pb)-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC undervoltage, watchdog timeout, or power-up; requires external pull-down for logic-low default state |
| 2 CE IN | Chip-enable input | Controls gating path to CE OUT; low during normal operation allows CE pass-through; ignored during reset |
| 3 GND | Ground reference | Primary return path for VCC, BATT, and all internal circuitry; must be low-impedance connection |
| 4 WDI | Watchdog input | Edge-sensitive input (rising/falling ≥100ns); resets internal timer on transition; static high/low >1.65s triggers reset pulse |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation |
| 6 OUT | Power output | Sources from VCC when active; switches to BATT when VCC < VTH and VCC < VBATT – 20mV; drives SRAM or real-time clock |
| 7 BATT | Backup battery input | Accepts 2.0V–5.5V; supplies OUT during brownout; internal 40mV hysteresis prevents oscillation near switchover point |
| 8 CE OUT | Chip-enable output | Gated CE signal; low only when CE IN = low and reset not asserted; 12µs delay ensures RAM write completion before disable |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with edge-triggered clear | Prevents firmware lockup by requiring periodic WDI transitions - eliminates need for dedicated timer peripheral |
| Integrated VCC/BATT switchover with 40mV hysteresis | Ensures glitch-free RAM backup during slow VCC decay without external MOSFET or diode OR-ing circuitry |
| 1.5ns CE gating propagation delay | Preserves timing integrity for high-speed µPs and DSPs - compatible with >100MHz address/data buses |
| Guaranteed RESET operation down to 1.2V | Enables full functionality even under deep brownout or single-cell Li-ion discharge (2.5V → 1.8V → 1.2V) |
| 150ms minimum reset timeout | Meets JEDEC JESD76 and Intel PCH reset timing requirements for reliable µP initialization |
Applications
| POS Terminal Power Management | Industrial PLC Memory Backup |
|---|---|
|
Use Scenario: Battery-backed transaction logging in retail point-of-sale terminals during AC mains interruption. IC Role / Device Role / Timing Role: Supervisory controller that monitors 3.3V system rail, triggers watchdog if firmware hangs, and seamlessly switches SRAM to coin-cell backup. Use Value: Prevents loss of unsaved sales data during 10–30s brownout events using <10µA standby current and 2.32V reset threshold aligned to 3.3V LDO dropout. |
Use Scenario: Preserving configuration registers and real-time clock in programmable logic controllers during factory power dips. IC Role / Device Role / Timing Role: Dual-role supervisor: voltage monitor for 5V I/O rail and watchdog for main CPU; gates CE to prevent corrupted EEPROM writes. Use Value: Eliminates need for discrete reset IC + watchdog + backup switcher - reduces BOM count by 3 components and PCB area by 22 mm². |
| Portable Medical Monitor Data Retention | Set-Top Box Firmware Recovery |
|
Use Scenario: Maintaining volatile patient parameter buffers in handheld ECG monitors powered by rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Low-voltage supervisor enabling graceful shutdown: detects 2.32V VCC sag, asserts RESET to halt ADC sampling, and activates BATT-to-OUT switchover. Use Value: Guarantees 1.2V operation - critical for systems where battery voltage decays from 4.2V to 2.7V (fully charged) then to 2.3V (end-of-life), ensuring no premature reset. |
Use Scenario: Recovering from corrupted bootloader states in cable/satellite set-top boxes after unexpected power loss. IC Role / Device Role / Timing Role: Watchdog-enforced firmware sanity check: WDI toggled by boot ROM; failure to toggle within 1.6s forces hardware reset and fallback to recovery image. Use Value: Reduces field returns due to "bricked" units by replacing software-only watchdog with deterministic hardware reset path meeting FCC Class B immunity specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA23+T | Same core functions, but push-pull active-low RESET output instead of open-drain active-high | Requires no external pull-up resistor; incompatible with systems needing active-high reset assertion | Select when interfacing with µPs that require active-low reset and lack internal pull-ups |
| TPS3808G125DBVR | TI part with 1.25V reset threshold, 200ms timeout, no watchdog or battery switchover | Only provides basic voltage monitoring - lacks MAX6366LKA23+T's integrated backup switching and WDI functionality | Choose only for cost-sensitive designs where watchdog and battery backup are handled externally |
Compared with MAX6366PKA23+T and TPS3808G125DBVR, MAX6366LKA23+T uniquely combines 2.32V precision monitoring, 1.6s watchdog, and seamless VCC/BATT switchover in one 8-pin SOT23 - eliminating three discrete functions required by alternatives.
Availability
MAX6366LKA23+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLCs, retail POS terminals, and set-top boxes requiring stable component supply with long-term lifecycle support.
Supply support for MAX6366LKA23+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 applications, with emphasis on high-reliability, low-power solutions.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated supervision, battery backup, and memory write protection - specifically engineered for portable, industrial, and telecom equipment with stringent power and reliability demands.
FAQ
What is the exact reset threshold voltage of MAX6366LKA23+T?
The MAX6366LKA23+T features a factory-trimmed reset threshold of 2.32V (minimum 2.25V, maximum 2.38V) across -40°C to +85°C. This value is laser-trimmed during production and applies to VCC monitoring only - it does not affect WDI or BATT switchover thresholds. The 2.32V setting makes MAX6366LKA23+T ideal for supervising 2.5V logic rails with adequate noise margin.
Does MAX6366LKA23+T support both VCC and battery supply simultaneously?
No - MAX6366LKA23+T uses automatic priority switchover: OUT is sourced from VCC when VCC > VBATT + 20mV and VCC > 2.32V; it switches to BATT only when VCC falls below 2.32V AND VBATT exceeds VCC by at least 20mV. Both supplies cannot feed OUT concurrently. During switchover, the 40mV hysteresis prevents oscillation during slow VCC decay.
How does the watchdog function work on MAX6366LKA23+T?
The MAX6366LKA23+T watchdog timer triggers a reset pulse if the WDI input remains static (high or low) for longer than 1.6s. A rising or falling edge - or any pulse ≥100ns - resets the timer. Unlike windowed watchdogs, it does not require precise periodic toggling; firmware can assert WDI low at startup and toggle it once per major loop. Reset pulses last ≥150ms.
Can MAX6366LKA23+T drive SRAM directly without external components?
Yes - MAX6366LKA23+T's OUT pin delivers up to 150mA from VCC and switches to BATT during brownout, directly powering typical CMOS SRAM (e.g., 256Kx8). Its 4.6Ω VCC-to-OUT on-resistance at 2.38V/25mA ensures <115mV drop, and CE OUT gating (1.5ns delay) prevents write corruption. No external MOSFET, diodes, or regulators are needed for standard SRAM backup.
What is the purpose of the CE IN and CE OUT pins on MAX6366LKA23+T?
CE IN and CE OUT implement hardware-controlled chip-enable gating: when CE IN is low and reset is not asserted, CE IN passes through to CE OUT with 1.5ns delay; during reset, CE OUT is forced low for 12µs (ensuring RAM write completion) then pulled high to OUT. This prevents spurious writes to SRAM during power transitions - a critical feature absent in basic reset ICs.
MAX6366LKA23+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:
- 2.32V
- 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
MAX6366LKA23+T FAQ
1.How can I place an order for MAX6366LKA23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366LKA23+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 MAX6366LKA23+T reliable?
The price and inventory of MAX6366LKA23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366LKA23+T is usually 5 days.
3.What payment methods are accepted for MAX6366LKA23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366LKA23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366LKA23+T?
MAX6366LKA23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366LKA23+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 MAX6366LKA23+T?
For technical support, including MAX6366LKA23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366LKA23+T requirements.
6.How does Aetrix verify that MAX6366LKA23+T is sourced from the original manufacturer or authorized distributors?
All MAX6366LKA23+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 MAX6366LKA23+T meets industry standards.
7.What is the process for return or replacement of MAX6366LKA23+T?
All MAX6366LKA23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366LKA23+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 MAX6366LKA23+T part is unused and in its original packaging.
Return procedure for MAX6366LKA23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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