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Analog Devices Inc./Maxim Integrated MAX6864UK31D3S+T
- Part No.:
- MAX6864UK31D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK31D3S+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,998
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Product details
Overview
MAX6864UK31D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.075V reset threshold (suffix "31"), 150ms minimum reset timeout (suffix "D3"), and 3.3s typical watchdog timeout (suffix "S"). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog timeout - designed for battery-powered medical and portable electronics requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6864UK31D3S+T datasheet, MAX6864UK31D3S+T pinout, MAX6864UK31D3S+T application, or MAX6864UK31D3S+T equivalent, this page delivers verified functional specifications, validated pin roles, confirmed timing behavior under brownout and watchdog fault conditions, and real-world selection guidance for low-power µP supervision in constrained environments.
Technical Context
The MAX6864UK31D3S+T integrates three core supervision functions: precise VCC voltage monitoring with ±2.5% threshold accuracy, a manual reset input (MR) with 250ns propagation delay and internal 10kΩ pullup, and a watchdog timer that clears on any WDI edge and expires after 3.3s (typ) if inactive. Its reset output remains asserted for ≥150ms after VCC rises above 3.075V and MR deasserts.
It operates across -40°C to +85°C with supply voltage range 1.2V–5.5V, guarantees valid reset assertion down to VCC = +1.1V, and features immunity to VCC transients ≤40µs at 100mV overdrive - enabling robust operation in noisy, low-voltage battery systems without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year battery life in glucose monitors and wearables. |
| Reset Threshold Voltage | 3.075V (min 2.998V, max 3.152V) - factory-trimmed for precise supervision of 3.3V rails. |
| Reset Timeout Period | 150ms min (D3 option) - ensures µP completes power-up initialization before release. |
| Watchdog Timeout | 3.3s typ (S suffix) - balances fault detection responsiveness with software execution margin. |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems. |
| Reset Output Type | Active-low push-pull - drives µP reset directly without external pullup; sinks 500µA at VCC ≥ 2.38V. |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout. |
Pinout & Package
MAX6864UK31D3S+T is housed in a RoHS-compliant, lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), footprint-compatible with industry-standard 5-pin SOT23 layouts. Thermal resistance θJA = 140°C/W; maximum power dissipation = 571mW at +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - asserts low during VCC undervoltage, MR assertion, or WDI timeout; deasserts only after full 150ms timeout. |
| 2 | GND | Ground reference - must connect to system ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; 250ns delay from MR low to RESET assert. |
| 4 | WDI | Watchdog input - rising or falling edge clears internal 3.3s timer; glitch rejection <200ns. |
| 5 | VCC | Supply and monitored rail - powers device and serves as voltage sense input; requires 0.1µF bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in always-on patient monitors and pagers. |
| Factory-trimmed VTH | 3.075V ±2.5% - eliminates external resistor networks and calibration for 3.3V systems. |
| Integrated watchdog | 3.3s typical timeout with edge-triggered clear - detects firmware hangs without CPU intervention. |
| No external components | Self-contained supervision - no capacitors, resistors, or diodes required for basic operation. |
| Brownout immunity | Valid reset assertion down to VCC = +1.1V - ensures reliable reset even during severe voltage collapse. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail, asserts reset on brownout or firmware lockup, and validates power integrity before sensor initialization. Use Value: Prevents corrupted glucose readings due to undervoltage-induced MCU malfunction; 170nA ICC extends disposable sensor life beyond 7 days. |
Use Scenario: Portable ECG/SpO₂ units powered by CR2032 coin cell with intermittent wireless reporting. IC Role / Device Role / Timing Role: Monitors VCC during battery discharge curve, triggers watchdog reset if BLE stack stalls, and holds reset until stable 3.075V is restored. Use Value: Guarantees clinical-grade data reliability; 150ms reset timeout accommodates slow LDO startup in ultra-low-power designs. |
| MP3 Players | Industrial Handheld Terminals |
|
Use Scenario: Flash-based audio players using single-cell Li-ion with aggressive power gating. IC Role / Device Role / Timing Role: Provides power-on reset and detects MCU freeze during file decode; WDI toggled by audio codec interrupt handler. Use Value: Eliminates "frozen screen" failures; 3.3s watchdog period allows full MP3 frame decode without false triggers. |
Use Scenario: Ruggedized barcode scanners operating in warehouses with fluctuating 3.3V supply from switching regulators. IC Role / Device Role / Timing Role: Supervises main logic rail, rejects sub-40µs supply glitches, and initiates hard reset on communication lockup. Use Value: Maintains operational uptime in electrically noisy environments; push-pull RESET drives reset line without pullup resistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog timer, 1.2µA ICC. | Lacks watchdog functionality; suitable only for basic voltage monitoring without code-execution safety. | Select when watchdog is unnecessary and higher ICC is acceptable for cost-sensitive designs. |
| STM6315SW33F | 3.3V threshold, 140ms timeout, 2.5µA ICC, integrated watchdog with 1.6s timeout, SOT23-5. | Higher supply current and shorter watchdog period; not qualified for medical-grade reliability. | Choose for non-critical industrial use where Maxim's 170nA ICC and 3.3s watchdog are not required. |
Compared with TPS3836K33DBVR and STM6315SW33F, MAX6864UK31D3S+T uniquely combines medical-grade low ICC (170nA), precise 3.075V threshold, and long 3.3s watchdog - making it optimal for battery-constrained, safety-critical supervision where extended runtime and firmware fault coverage are mandatory.
Availability
MAX6864UK31D3S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, portable audio devices, and industrial handheld terminals requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6864UK31D3S+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 MAX6864UK31D3S+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for ultra-low-power, safety-critical embedded systems where battery longevity and deterministic reset behavior under brownout or software fault conditions are essential.
FAQ
What is the exact reset threshold voltage of MAX6864UK31D3S+T?
The MAX6864UK31D3S+T has a factory-trimmed reset threshold of 3.075V, with guaranteed tolerance of ±2.5% (2.998V to 3.152V) over -40°C to +85°C. This value is encoded in the "31" suffix per Maxim's Threshold Suffix Guide and is measured at VCC falling. The MAX6864UK31D3S+T does not require external calibration to achieve this precision.
Does MAX6864UK31D3S+T include a watchdog timer, and what is its timeout?
Yes, MAX6864UK31D3S+T includes an integrated watchdog timer with a typical timeout of 3.3s, denoted by the "S" suffix in the part number. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static longer than 3.3s (min 1.5s, max 7.75s). This behavior is confirmed in the Electrical Characteristics table and Functional Diagram of the MAX6864UK31D3S+T datasheet.
What is the reset timeout period for MAX6864UK31D3S+T, and how is it set?
The MAX6864UK31D3S+T has a fixed minimum reset timeout period of 150ms, indicated by the "D3" suffix. This value is factory-programmed and cannot be adjusted externally. It ensures the reset signal remains asserted for ≥150ms after VCC exceeds 3.075V and MR is deasserted - sufficient for most 3.3V µP power-up sequences. No external capacitor or resistor is needed to configure this timing.
Can MAX6864UK31D3S+T operate down to 1.2V supply, and is reset valid at low VCC?
Yes, MAX6864UK31D3S+T operates from VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = +1.1V - confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. At VCC = 1.1V, the device still sinks 50µA on RESET while asserting low, ensuring deterministic behavior during deep brownout conditions critical for medical and portable applications.
What package type and pin configuration does MAX6864UK31D3S+T use?
MAX6864UK31D3S+T uses a 5-pin SOT23-5 package (JEDEC MO-178AA) with standard pinout: Pin 1 = RESET (active-low push-pull), Pin 2 = GND, Pin 3 = MR (active-low manual reset), Pin 4 = WDI (watchdog input), Pin 5 = VCC. This layout matches Maxim's official Pin Configurations diagram and is compatible with automated SMT assembly processes.
MAX6864UK31D3S+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:
- Active
- 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:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6864UK31D3S+T FAQ
1.How can I place an order for MAX6864UK31D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK31D3S+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 MAX6864UK31D3S+T reliable?
The price and inventory of MAX6864UK31D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK31D3S+T is usually 5 days.
3.What payment methods are accepted for MAX6864UK31D3S+T?
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4.How is shipping managed for MAX6864UK31D3S+T?
MAX6864UK31D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6864UK31D3S+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 MAX6864UK31D3S+T?
For technical support, including MAX6864UK31D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK31D3S+T requirements.
6.How does Aetrix verify that MAX6864UK31D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK31D3S+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 MAX6864UK31D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK31D3S+T?
All MAX6864UK31D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK31D3S+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 MAX6864UK31D3S+T part is unused and in its original packaging.
Return procedure for MAX6864UK31D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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