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Analog Devices Inc./Maxim Integrated MAX6864UK33D3S+T
- Part No.:
- MAX6864UK33D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK33D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,048
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Product details
Overview
The MAX6864UK33D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (3.3V reset threshold), manual reset input (MR), and watchdog timer (3.3s timeout) for embedded power management. It asserts an active-low push-pull RESET output when VCC drops below 3.3V, MR is pulled low, or the watchdog expires - ensuring reliable boot-up and fault recovery in ultra-low-power systems.
For engineers reviewing the MAX6864UK33D3S+T datasheet, MAX6864UK33D3S+T pinout, MAX6864UK33D3S+T application, or MAX6864UK33D3S+T equivalent, this device is selected for battery-powered medical monitors, portable instrumentation, and energy-harvesting nodes where sub-200nA quiescent current, guaranteed reset validity down to VCC = 1.1V, and immunity to short VCC transients are critical design requirements.
Technical Context
The MAX6864UK33D3S+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, a digital watchdog timer that clears on any WDI edge (rising or falling), and a fixed 150ms minimum reset timeout period (D3 option). Its internal 10kΩ MR pullup and glitch-rejecting input logic eliminate external components for manual reset implementation.
Unlike variants without watchdog capability, the MAX6864UK33D3S+T integrates a dedicated WDI input with 150ns pulse-width detection and temperature-stable timeout (±15% over -40°C to +85°C), while maintaining full compatibility with standard µP reset timing requirements including tRD < 40µs and tMRD = 250ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.3V ±2.5% - factory-trimmed for precise brownout detection at nominal 3.3V supply rails |
| Supply Current | 170nA typical at 2.5V - enables multi-year operation on coin-cell batteries |
| Watchdog Timeout | 3.3s typical - balances fault detection responsiveness with software execution margin |
| Reset Timeout | 150ms minimum - ensures sufficient hold time for µP initialization and PLL lock |
| VCC Validity Range | Operates down to VCC = 1.1V - guarantees reset assertion during deep brownout conditions |
| MR Input Logic | Active-low with 10kΩ internal pullup - supports direct connection to momentary switches or CMOS outputs without external biasing |
| WDI Pulse Detection | 150ns minimum pulse width - reliably captures fast software toggles even under high clock jitter |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives µP reset pin directly; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity and accurate threshold sensing |
| 3 | MR | Manual reset input - asserted low to force system reset; internally pulled up to VCC |
| 4 | WDI | Watchdog input - toggled by host µP to prevent timeout; edge-sensitive with 150ns minimum pulse width |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical - reduces battery drain by >95% vs. legacy supervisors, enabling >10-year shelf life in glucose meters |
| Watchdog Timer | 3.3s timeout with edge-clearing logic - prevents runaway code without requiring precise software timing margins |
| Reset Validity | Guaranteed to VCC = 1.1V - ensures deterministic reset behavior during slow power-down or weak battery conditions |
| VCC Transient Immunity | Immune to ≤40µs transients at 100mV overdrive - eliminates false resets in noisy automotive or industrial environments |
| No External Components | Integrated MR pullup, precision voltage reference, and watchdog oscillator - eliminates BOM cost and layout area |
Applications
| Portable Medical Devices | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Glucose monitors and patient telemetry units operating from CR2032 coin cells with infrequent wake-up cycles. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout protection, and watchdog-triggered recovery during firmware hangs. Use Value: 170nA supply current extends battery life beyond 5 years; 3.3V threshold matches common LDO output rails; 150ms reset timeout accommodates BLE radio initialization. |
Use Scenario: Handheld multimeters and environmental sensors powered by AA alkaline cells in field-deployed equipment. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor ensuring reliable startup after battery replacement and preventing firmware lockups during measurement routines. Use Value: Immunity to 40µs VCC transients prevents false resets during motor-driven display updates; 3.3s watchdog timeout allows full ADC conversion sequences before intervention. |
| Energy-Harvesting Nodes | Low-Power Industrial Controllers |
Use Scenario: Solar- or thermal-harvested wireless sensor nodes with intermittent power availability and long sleep intervals. IC Role / Device Role / Timing Role: Nanopower supervisor managing cold-start sequencing and validating VCC stability before waking the µP from deep sleep. Use Value: Operation down to VCC = 1.1V enables functional reset assertion even as harvested voltage decays; zero external components simplify ultra-miniature PCB design. |
Use Scenario: Programmable logic controllers (PLCs) with isolated I/O modules requiring fail-safe reset coordination across multiple voltage domains. IC Role / Device Role / Timing Role: Local supervisor for 3.3V logic domain, asserting reset to µP and clearing watchdog on communication activity via isolated UART interface. Use Value: Edge-triggered WDI input simplifies isolation barrier design (no level-shifting needed); push-pull RESET drives optocoupler inputs directly without pullup resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6865UK33D3S+T | Active-high push-pull RESET output instead of active-low | Requires inverted reset logic on µP side; incompatible with systems expecting active-low reset assertion | Select only if host µP reset pin is active-high or if board-level inversion is already implemented |
| TPS3836K33DBVR | Higher 1.2µA typical supply current; no integrated watchdog timer; 3.3V threshold with ±1.5% accuracy | Lacks watchdog functionality - requires separate timer IC or firmware-based watchdog for code execution monitoring | Choose when ultra-low power is secondary to tighter threshold tolerance and no watchdog is needed |
Compared with MAX6864UK33D3S+T, MAX6865UK33D3S+T offers identical supervision and watchdog performance but differs in reset polarity, while TPS3836K33DBVR trades nanopower operation for improved threshold accuracy and omits watchdog capability entirely - making it suitable only for simpler reset-only applications.
Availability
MAX6864UK33D3S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and energy-harvesting nodes requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for MAX6864UK33D3S+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 management, sensing, and connectivity in demanding industrial, medical, and automotive applications.
The MAX6864UK33D3S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power embedded systems where extended battery life, robust fault detection, and minimal external components are mandatory design constraints.
FAQ
What is the exact reset threshold voltage of the MAX6864UK33D3S+T?
The MAX6864UK33D3S+T has a factory-trimmed reset threshold of 3.3V with ±2.5% accuracy over the full -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) and Electrical Characteristics section of the datasheet, where suffix "33" explicitly denotes 3.3V nominal threshold. The actual threshold falls between 3.218V and 3.383V at TA = +25°C.
Does the MAX6864UK33D3S+T require external components for basic operation?
No, the MAX6864UK33D3S+T operates with zero external components for core functionality: it includes an internal 10kΩ pullup on MR, a precision voltage reference, and a self-contained watchdog oscillator. Only a 0.1µF ceramic bypass capacitor on VCC to GND is recommended for noise immunity - no pullups, resistors, or timing capacitors are needed for reset generation or watchdog operation.
How does the watchdog timer in the MAX6864UK33D3S+T clear and timeout?
The MAX6864UK33D3S+T watchdog timer clears on any rising or falling edge at the WDI pin and times out after 3.3s (typical) if no edge occurs. When timeout occurs, it asserts the RESET output for the fixed 150ms minimum period. The timer remains disabled while RESET is asserted and resumes counting immediately upon RESET deassertion - ensuring deterministic recovery without race conditions.
What is the minimum VCC voltage at which the MAX6864UK33D3S+T guarantees valid reset output?
The MAX6864UK33D3S+T guarantees valid RESET output down to VCC = 1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, reset assertion is not guaranteed. This feature ensures reliable brownout protection even as battery voltage declines significantly during discharge.
Is the MAX6864UK33D3S+T pin-compatible with other members of the MAX68xx family?
Yes, the MAX6864UK33D3S+T uses the standard 5-pin SOT23-5 package with identical pinout (RESET, GND, MR, WDI, VCC) as all MAX6864–MAX6869 variants. It is not pin-compatible with MAX6854–MAX6863 (which lack WDI) or MAX6858/MAX6860 (which have I.C. pins instead of WDI), but shares footprint and routing with MAX6865/MAX6866 having same suffix structure.
MAX6864UK33D3S+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.3V
- 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-23-5
MAX6864UK33D3S+T FAQ
1.How can I place an order for MAX6864UK33D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK33D3S+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 MAX6864UK33D3S+T reliable?
The price and inventory of MAX6864UK33D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK33D3S+T is usually 5 days.
3.What payment methods are accepted for MAX6864UK33D3S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6864UK33D3S+T transactions.
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4.How is shipping managed for MAX6864UK33D3S+T?
MAX6864UK33D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6864UK33D3S+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 MAX6864UK33D3S+T?
For technical support, including MAX6864UK33D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK33D3S+T requirements.
6.How does Aetrix verify that MAX6864UK33D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK33D3S+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 MAX6864UK33D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK33D3S+T?
All MAX6864UK33D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK33D3S+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 MAX6864UK33D3S+T part is unused and in its original packaging.
Return procedure for MAX6864UK33D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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