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Analog Devices Inc./Maxim Integrated MAX6864UK31D1S+T
- Part No.:
- MAX6864UK31D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK31D1S+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,015
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Product details
Overview
The MAX6864UK31D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring voltage monitoring (reset threshold = +3.075V), manual reset input (MR), and watchdog timer (timeout = 3.3s typ). It asserts an active-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, with guaranteed reset validity down to VCC = +1.1V. It is designed for ultra-low-power portable medical and consumer devices requiring reliable power-on reset and firmware fault recovery.
For engineers reviewing the MAX6864UK31D1S+T datasheet, MAX6864UK31D1S+T pinout, MAX6864UK31D1S+T application, or MAX6864UK31D1S+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery-powered systems, and validated alternative options - all grounded in Maxim's official specifications and ordering documentation.
Technical Context
The MAX6864UK31D1S+T integrates a precision voltage monitor with ±2.5% threshold accuracy, a glitch-immune manual reset input (250ns MR-to-reset delay, 1µs minimum pulse width), and a dedicated watchdog timer that clears on any WDI edge and expires after 3.3s (typ) of inactivity. Its internal 10kΩ MR pullup and 20nA WDI/CT input leakage ensure minimal loading in low-power systems.
It operates across VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1.1V, with supply current as low as 170nA (typ) at 1.8V - enabling operation in deep-sleep states of glucose monitors and wearables. The device uses BiCMOS process technology and contains 2848 transistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | +3.075V (factory-trimmed, ±2.5% tolerance; matches 3.3V rail monitoring) |
| Watchdog Timeout Period | 3.3s typical (S-suffix); enables robust firmware hang detection without excessive wake-ups) |
| Reset Timeout Period | 10ms minimum (D1 suffix); ensures µP initialization completes before release) |
| Supply Current | 170nA typical at VCC = 1.8V; supports multi-year battery life in always-on sensors |
| VCC Operating Range | 1.2V to 5.5V; compatible with Li-ion, coin-cell, and regulated 1.8V/3.3V supplies |
| RESET Output Type | Push-pull active-low; eliminates external pull-up and simplifies interface to 3.3V µP reset inputs |
| Guaranteed Reset Validity | Down to VCC = +1.1V; ensures deterministic reset behavior during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm × 1.1mm) suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; drives µP reset pin directly; sinks 50µA @ VCC ≥ 1.1V |
| 2 | GND | Ground reference; must be connected to system ground plane for noise immunity |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | WDI | Watchdog input; edge-sensitive (150ns min pulse); clears internal timer on rising/falling transitions |
| 5 | VCC | Supply voltage input; monitored for reset generation; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical at 1.8V - extends battery life in glucose monitors and pagers beyond 5 years |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy DC-DC environments |
| No external components required | Integrated MR pullup, precise voltage reference, and watchdog oscillator eliminate BOM cost and layout area |
| Guaranteed reset validity to 1.1V | Ensures µP remains held in reset until supply stabilizes below operational voltage - critical for flash programming safety |
| Watchdog edge-triggered clear | WDI responds to any logic transition (not just toggles), enabling flexible software heartbeat placement |
Applications
| Portable Medical Sensors | Low-Power Consumer Electronics |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on single coin cell. IC Role / Device Role / Timing Role: Supervises 1.8V LDO output and triggers hardware reset if firmware hangs or supply sags during sensor calibration. Use Value: 170nA quiescent current directly contributes to >10,000-hour battery runtime; 3.3s watchdog prevents missed glucose alerts due to frozen UI. |
Use Scenario: Bluetooth LE audio earbuds entering deep sleep between streaming sessions. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts reset if VCC drops during battery discharge or charging transient. Use Value: +3.075V threshold aligns precisely with 3.3V rail brownout point; 10ms reset timeout allows full SoC boot before RF initialization. |
| Industrial Handheld Terminals | Wearable Health Trackers |
|
Use Scenario: Ruggedized barcode scanner operating in variable-temperature warehouses. IC Role / Device Role / Timing Role: Provides cold-start reset at power-on and detects firmware lockups during barcode decode loops. Use Value: Guaranteed operation from –40°C to +85°C and 1.2V–5.5V supply range ensures reliability across charging, battery, and USB power modes. |
Use Scenario: Optical heart-rate monitor sampling every 5 seconds while maintaining <10µA average system current. IC Role / Device Role / Timing Role: Generates clean power-on reset and serves as fail-safe watchdog triggered by motion-detection interrupt service routine. Use Value: MR input enables user-initiated factory reset via button press; open-drain compatibility (via internal configuration) supports mixed-voltage I/O domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold; no watchdog; 2.5µA supply current; SOT23-5 | Lacks watchdog functionality - suitable only where firmware-level error recovery suffices | Select when lowest possible BOM cost is prioritized over fault coverage, and system already implements software watchdog |
| MAX6361KA29D3+T | 3.0V reset threshold; 1.6µA supply current; no watchdog; push-pull active-low RESET | Higher ICC limits battery life in multi-year deployments; no WDI pin - requires external timing circuit for hang detection | Choose for legacy Maxim designs needing drop-in replacement where watchdog is unused and 1.6µA ICC is acceptable |
Compared with TPS3836K33DBVR and MAX6361KA29D3+T, the MAX6864UK31D1S+T uniquely delivers nanopower supervision *with integrated watchdog* in the same SOT23-5 footprint - eliminating external components and enabling autonomous firmware recovery without increasing system current budget.
Availability
MAX6864UK31D1S+T is available at Aetrix Electronics and suitable for portable medical sensors, low-power consumer electronics, and industrial handheld terminals requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6864UK31D1S+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, medical, and communications applications.
The MAX6864UK31D1S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-critical applications demanding sub-µA current draw, precise voltage monitoring, and autonomous firmware fault recovery.
FAQ
What is the exact reset threshold voltage of the MAX6864UK31D1S+T?
The MAX6864UK31D1S+T has a factory-trimmed reset threshold voltage of +3.075V, with ±2.5% tolerance over temperature (–40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "31" corresponds to 3.075V nominal. The MAX6864UK31D1S+T maintains this accuracy without external calibration.
Does the MAX6864UK31D1S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6864UK31D1S+T includes a watchdog timer with a typical timeout of 3.3s, indicated by the "S" suffix in the part number. Per Table 3 (Watchdog Timeout), the S-suffix guarantees a minimum of 1.5s and maximum of 7.75s. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period.
What does the "D1" in MAX6864UK31D1S+T signify?
The "D1" suffix in MAX6864UK31D1S+T specifies the reset timeout period: 10ms minimum, 15ms typical, and 25ms maximum. This is defined in Table 4 (Reset Timeout Periods) of the datasheet. The D1 option ensures rapid release of the microprocessor after power stabilization, ideal for fast-booting portable devices.
Is the MAX6864UK31D1S+T pin-compatible with other devices in the MAX68xx family?
The MAX6864UK31D1S+T uses the standard 5-pin SOT23-5 pinout shared across MAX6864–MAX6869 variants (Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VCC). However, it is not pin-compatible with MAX6861–MAX6863 (which use Pin 1 = CT) or MAX6854–MAX6856 (which lack WDI). Always verify pin function alignment per device-specific pin descriptions.
What is the supply current specification for the MAX6864UK31D1S+T under typical operating conditions?
The MAX6864UK31D1S+T draws 170nA typical supply current at VCC = 1.8V and TA = +25°C, as specified in the Electrical Characteristics table. At VCC = 3.3V, typical ICC is 190nA. This ultra-low current enables multi-year operation from coin-cell batteries and is measured with reset deasserted and no watchdog toggling.
MAX6864UK31D1S+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Last Time Buy
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6864UK31D1S+T FAQ
1.How can I place an order for MAX6864UK31D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK31D1S+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 MAX6864UK31D1S+T reliable?
The price and inventory of MAX6864UK31D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK31D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6864UK31D1S+T?
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4.How is shipping managed for MAX6864UK31D1S+T?
MAX6864UK31D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6864UK31D1S+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 MAX6864UK31D1S+T?
For technical support, including MAX6864UK31D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK31D1S+T requirements.
6.How does Aetrix verify that MAX6864UK31D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK31D1S+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 MAX6864UK31D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK31D1S+T?
All MAX6864UK31D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK31D1S+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 MAX6864UK31D1S+T part is unused and in its original packaging.
Return procedure for MAX6864UK31D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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