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Analog Devices Inc./Maxim Integrated MAX6864UK31D1S+
- Part No.:
- MAX6864UK31D1S+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK31D1S+.pdf
- Description:
- MAX6864 NANOPOWER MICROPROCESSOR
- Quantity:
- Payment:
- Shipping:
Inventory:383
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Product details
Overview
The MAX6864UK31D1S+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (reset threshold = +3.075V), manual reset input (MR), and watchdog timer (timeout = 3.3s typ) with ultra-low 170nA typical supply current. It asserts an active-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, ensuring reliable boot-up and runtime fault recovery in battery-constrained systems.
For engineers reviewing the MAX6864UK31D1S+ datasheet, MAX6864UK31D1S+ pinout, MAX6864UK31D1S+ application, or MAX6864UK31D1S+ equivalent, this device is selected for low-power embedded systems requiring guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), and deterministic watchdog supervision of firmware execution flow.
Technical Context
The MAX6864UK31D1S+ integrates a precision voltage comparator with ±2.5% reset threshold accuracy, a monostable reset timeout generator (10ms min), and a digital watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable direct switch interfacing without external components.
Reset assertion is synchronized to VCC falling edge detection with 40µs propagation delay (tRD), while the watchdog monitors µP activity via WDI - a dedicated input tolerant to 0.3×VCC/0.7×VCC logic thresholds and capable of detecting 150ns pulses. The push-pull RESET output sinks ≥50µA at 0.3V (VCC ≥ 1.1V) and sources ≥200µA at 0.8×VCC (VCC ≥ 1.71V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V; enables multi-year operation on coin-cell batteries. |
| Reset Threshold Voltage | +3.075V (suffix D1, Table 2); factory-trimmed ±2.5% accuracy ensures precise brownout detection for 3.3V systems. |
| Reset Timeout Period | 10ms minimum (suffix D1, Table 4); guarantees sufficient hold time for µP initialization after power stabilization. |
| Watchdog Timeout | 3.3s typical (suffix S, Table 3); provides robust firmware supervision without excessive timeout latency. |
| VCC Operating Range | 1.2V to 5.5V; supports wide-input battery-powered designs including single-cell Li-ion and dual-cell alkaline. |
| Reset Validity Limit | Guaranteed down to VCC = +1.1V; ensures deterministic reset behavior during deep brownout conditions. |
| MR Input Glitch Rejection | 200ns; rejects noise spikes without requiring external RC filtering. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; drives µP reset pin directly without external pullup; valid to VCC = +1.1V. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS logic levels; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on transition; detects pulses ≥150ns. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current extends battery life in portable medical and IoT devices. |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog oscillator eliminate BOM cost and layout area. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive, preventing spurious resets in noisy environments. |
| Guaranteed reset validity | RESET output remains functional down to VCC = +1.1V, ensuring fail-safe behavior during deep undervoltage. |
| Watchdog edge-triggered clear | WDI transitions (not level holds) reset the timer, enabling robust software supervision without timing jitter. |
Applications
| Glucose Monitor | Patient Monitor |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps where battery replacement is infrequent and firmware reliability is critical. IC Role / Device Role / Timing Role: Supervises µP power-up sequence and runtime execution via WDI; triggers hard reset on firmware hang or sensor communication failure. Use Value: Prevents erroneous insulin dosing by enforcing deterministic recovery from code lockups, leveraging 3.3s watchdog timeout and 10ms reset hold. |
Use Scenario: Portable bedside vital-sign monitors powered by rechargeable Li-ion batteries with strict energy budgets. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts RESET during brownout; MR enables clinician-initiated recalibration reset. Use Value: Ensures clinical data integrity by guaranteeing µP reset validity down to VCC = +1.1V and rejecting EMI-induced supply transients. |
| MP3 Player | Cell Phone Baseband |
Use Scenario: Flash-based audio players using low-voltage microcontrollers and flash memory requiring clean power sequencing. IC Role / Device Role / Timing Role: Provides 10ms reset timeout synchronized to VCC rise, preventing flash corruption during cold start. Use Value: Eliminates need for external RC reset networks, reducing component count while maintaining <170nA quiescent draw. |
Use Scenario: Baseband processors in GSM/UMTS handsets where RF noise induces supply instability and firmware crashes. IC Role / Device Role / Timing Role: Dual-fault protection: VCC monitor detects battery sag; WDI watches baseband SW execution loops. Use Value: Achieves carrier-grade reliability with 200ns MR glitch rejection and edge-triggered watchdog clearing immune to RF coupling. |
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 timer, 200ms reset timeout, 1.6µA ICC. | Lacks runtime firmware supervision; suitable only for power-monitoring-only use cases. | Select when watchdog functionality is unnecessary and higher ICC is acceptable for cost-sensitive designs. |
| MAX6316LUK31D3+ | Same 3.075V threshold and 10ms timeout, but no MR input or watchdog; 1.2µA ICC. | Provides basic voltage monitoring only; no manual reset or software supervision capability. | Choose for simplified, ultra-low-cost supervision where MR and WDI are not required. |
Compared with TPS3836K33DBVR and MAX6316LUK31D3+, the MAX6864UK31D1S+ uniquely delivers integrated watchdog supervision and manual reset in a nanopower package - essential for safety-critical portable electronics where firmware lockup must trigger autonomous recovery.
Availability
MAX6864UK31D1S+ is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and cell phone baseband modules requiring stable component supply across extended production lifecycles.
Supply support for MAX6864UK31D1S+ 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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and consumer markets.
The MAX6864UK31D1S+ belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-operated devices demanding sub-µA quiescent current, guaranteed reset behavior under brownout, and integrated watchdog supervision.
FAQ
What is the exact reset threshold voltage of the MAX6864UK31D1S+?
The MAX6864UK31D1S+ has a factory-trimmed reset threshold voltage of +3.075V (±2.5%), corresponding to suffix "31" in the ordering code per Maxim's Threshold Suffix Guide. This value is guaranteed over the full -40°C to +85°C operating temperature range and ensures precise brownout detection for 3.3V nominal systems. The MAX6864UK31D1S+ uses this threshold to assert RESET whenever VCC falls below this level.
Does the MAX6864UK31D1S+ include a watchdog timer, and what is its timeout period?
Yes, the MAX6864UK31D1S+ includes a watchdog timer with a typical timeout period of 3.3 seconds, indicated 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 beyond this period. This behavior is confirmed in the Electrical Characteristics table and Functional Diagram of the MAX6864UK31D1S+ datasheet.
What is the reset timeout period for the MAX6864UK31D1S+?
The MAX6864UK31D1S+ has a minimum reset timeout period of 10ms, denoted by the "D1" suffix. This fixed timeout ensures the RESET signal remains asserted long enough for microprocessor initialization after VCC rises above the 3.075V threshold or after manual reset deassertion. The 10ms duration is guaranteed across temperature and supply voltage variations per the MAX6864UK31D1S+ specifications.
What package type and pin configuration does the MAX6864UK31D1S+ use?
The MAX6864UK31D1S+ is housed in a 5-pin SOT23-5 package with lead-free (RoHS-compliant) finish. Pin 1 is RESET (active-low push-pull), Pin 2 is GND, Pin 3 is MR (active-low manual reset), Pin 4 is WDI (watchdog input), and Pin 5 is VCC. This configuration is explicitly shown in the "MAX6864/MAX6865/MAX6866 Pin Description" section and "Pin Configurations" diagram of the MAX6864UK31D1S+ datasheet.
Is the MAX6864UK31D1S+ compatible with 1.8V or 2.5V supply rails?
Yes, the MAX6864UK31D1S+ operates over a VCC range of 1.2V to 5.5V and is fully specified at 1.8V, 2.5V, 3.3V, and 5.0V. Its 170nA typical supply current and guaranteed reset validity down to VCC = +1.1V make it suitable for low-voltage systems. The MAX6864UK31D1S+ maintains accurate reset threshold detection and functional watchdog operation across this entire range.
MAX6864UK31D1S+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- 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:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6864UK31D1S+ FAQ
1.How can I place an order for MAX6864UK31D1S+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK31D1S+ 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+ reliable?
The price and inventory of MAX6864UK31D1S+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK31D1S+ is usually 5 days.
3.What payment methods are accepted for MAX6864UK31D1S+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6864UK31D1S+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6864UK31D1S+?
MAX6864UK31D1S+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6864UK31D1S+ 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+?
For technical support, including MAX6864UK31D1S+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK31D1S+ requirements.
6.How does Aetrix verify that MAX6864UK31D1S+ is sourced from the original manufacturer or authorized distributors?
All MAX6864UK31D1S+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX6864UK31D1S+?
All MAX6864UK31D1S+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK31D1S+, 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+ part is unused and in its original packaging.
Return procedure for MAX6864UK31D1S+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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