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Analog Devices Inc./Maxim Integrated MAX6865UK31D1S+T
- Part No.:
- MAX6865UK31D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK31D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,725
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Product details
Overview
MAX6865UK31D1S+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"), 10ms minimum reset timeout (suffix "D1"), and watchdog timer with 3.3s typical timeout (suffix "S"). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - designed for battery-powered medical and portable electronics requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6865UK31D1S+T datasheet, MAX6865UK31D1S+T pinout, MAX6865UK31D1S+T application, or MAX6865UK31D1S+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, real-world use cases in glucose monitors and patient monitors, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX6865UK31D1S+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion logic combines three independent triggers: VCC falling below 3.075V ±2.5%, MR pulled low, or WDI inactivity exceeding 3.3s (typ). The internal reset timeout is fixed at 10ms (min), and the watchdog timer clears on any WDI edge, MR assertion, or active reset.
It features push-pull active-high RESET output referenced to VCC, guaranteed valid down to VCC = +1.1V, and immunity to VCC transients ≤40µs at 100mV overdrive. MR includes 10kΩ internal pullup and 250ns MR-to-reset delay; WDI accepts pulses as short as 150ns and draws ≤20nA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on medical devices. |
| Reset Threshold Voltage | 3.075V ±2.5% - factory-trimmed to monitor 3.3V rail with precise brownout detection. |
| Reset Timeout Period | 10ms min - ensures µP reset pulse meets minimum hold time requirements of modern low-power MCUs. |
| Watchdog Timeout | 3.3s typ (S-suffix) - provides robust software execution monitoring without excessive timeout latency. |
| Operating Voltage Range | 1.2V to 5.5V - supports wide-input battery systems including single Li-ion, dual alkaline, or regulated 3.3V/2.5V rails. |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup and simplifies interface to µP reset inputs expecting high-active assertion. |
| VCC Immunity | Valid reset assertion down to VCC = +1.1V - guarantees reliable reset during deep brownout or battery depletion. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during reset; requires no external components; referenced to VCC. |
| 2 | GND | Ground reference - must be connected 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 to RESET; accepts CMOS-level signals. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition; 150ns minimum pulse width supported. |
| 5 | VCC | Supply voltage input - monitored for reset generation; bypass with 0.1µF capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors powered by CR2032 cells. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - critical for fail-safe behavior during battery sag in portable medical devices. |
| Watchdog edge sensitivity | Clears on any WDI rising or falling edge - prevents false timeouts due to noise and supports flexible software polling schemes. |
| No external components | Integrated MR pullup, precision voltage reference, and timing circuitry eliminate BOM cost and board space for discrete support parts. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - avoids spurious resets in electrically noisy handheld environments. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose sensing device powered by coin-cell battery, operating unattended for weeks between charges. IC Role / Device Role / Timing Role: Supervises 3.3V system rail, asserts reset on brownout or software hang, and validates power integrity before MCU boot. Use Value: 170nA ICC extends battery life; 3.075V threshold matches 3.3V LDO output; 10ms reset pulse satisfies ARM Cortex-M0+ reset hold time. |
Use Scenario: Portable ECG/SpO₂ monitor used in home care settings with strict reliability and low-power requirements. IC Role / Device Role / Timing Role: Provides dual-fault protection: VCC supervision + watchdog monitoring of firmware execution loop. Use Value: 3.3s watchdog timeout allows sufficient time for sensor initialization and data transmission while catching stuck states; push-pull RESET ensures clean signal to safety-critical MCU. |
| Industrial Handheld Terminals | Low-Power IoT Edge Sensors |
|
Use Scenario: Ruggedized barcode scanner with intermittent wake/sleep cycles and frequent button-activated resets. IC Role / Device Role / Timing Role: MR input accepts mechanical switch closure; WDI monitors host processor activity; RESET coordinates cold boot sequence. Use Value: MR internal 10kΩ pullup eliminates external resistor; 250ns MR-to-reset delay ensures deterministic response; SOT23-5 footprint fits compact PCB layout. |
Use Scenario: Battery-operated environmental sensor node transmitting data every 5 minutes via BLE, requiring fail-safe recovery from lockups. IC Role / Device Role / Timing Role: Watches firmware main loop; triggers hardware reset if BLE stack hangs or sensor driver freezes. Use Value: 3.3s watchdog period aligns with typical sensor read-and-transmit cycle; 1.2–5.5V operating range supports direct connection to LiPo cell (3.0–4.2V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK31D1S+T | Same 3.075V threshold, 10ms timeout, 3.3s watchdog, but active-low push-pull RESET output. | Requires µP with active-low reset input; incompatible with systems needing active-high assertion without level-shifting. | Select when interfacing to legacy MCUs with /RESET pins or where active-low signaling simplifies board-level logic. |
| TPS3836K33DBVR | 3.08V threshold, 200ms min reset timeout, no watchdog timer, 1.6µA ICC - higher current, fixed longer timeout, no WDI. | Suitable only for basic power-on reset; cannot replace MAX6865UK31D1S+T in watchdog-dependent safety-critical designs. | Choose only for cost-sensitive, non-watchdog applications where extended reset pulse duration is acceptable and ultra-low ICC is not required. |
Compared with MAX6865UK31D1S+T, MAX6864UK31D1S+T offers identical supervision and watchdog specs but inverted RESET polarity, while TPS3836K33DBVR lacks watchdog functionality and consumes ~10× more current - making MAX6865UK31D1S+T uniquely suited for low-power, dual-fault-tolerant portable medical systems.
Availability
MAX6865UK31D1S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign monitors, industrial handheld terminals, and low-power IoT edge sensors requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK31D1S+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 MAX68xx family was designed specifically for nanopower microprocessor supervision in battery-constrained portable medical and consumer electronics, emphasizing ultra-low ICC, precise reset thresholds, and integrated watchdog functionality.
FAQ
What is the exact reset threshold voltage of MAX6865UK31D1S+T?
The MAX6865UK31D1S+T has a factory-trimmed reset threshold voltage of 3.075V, with ±2.5% tolerance across temperature (-40°C to +85°C). This value is defined by the "31" suffix per Maxim's Threshold Suffix Guide (Table 2), and is optimized for monitoring nominal 3.3V supply rails in portable medical devices.
Does MAX6865UK31D1S+T support active-high or active-low reset output?
MAX6865UK31D1S+T provides an active-high push-pull RESET output - it drives high during reset assertion and low when deasserted. This is confirmed by its pin description (Pin 1 = RESET, active-high push-pull) and Selector Guide entry, distinguishing it from MAX6864 (active-low) and MAX6866 (open-drain).
What is the watchdog timeout period for MAX6865UK31D1S+T?
The MAX6865UK31D1S+T features a watchdog timeout period of 3.3s (typical), specified by the "S" suffix in the part number. Electrical Characteristics table confirms min/typ/max values of 1.5s / 3.3s / 7.75s at TA = -40°C to +85°C, with normalized variation <±15% over temperature.
Can MAX6865UK31D1S+T operate down to 1.2V supply voltage?
Yes, MAX6865UK31D1S+T operates across VCC = 1.2V to 5.5V, and its reset function remains guaranteed down to VCC = +1.1V. At 1.2V, supply current is 190nA (typ), and RESET output maintains valid logic levels with VOH ≥ 0.8×VCC and VOL ≤ 0.3V under specified load conditions.
Is the manual reset input (MR) of MAX6865UK31D1S+T internally pulled up?
Yes, the MR pin of MAX6865UK31D1S+T includes an internal 10kΩ pullup resistor to VCC, as stated in the Pin Description and Applications Information sections. This allows direct connection of a momentary switch to GND without external components, and supports CMOS-level drive or open-drain interfaces.
MAX6865UK31D1S+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:
- 3.075V
- 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
MAX6865UK31D1S+T FAQ
1.How can I place an order for MAX6865UK31D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK31D1S+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 MAX6865UK31D1S+T reliable?
The price and inventory of MAX6865UK31D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK31D1S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK31D1S+T?
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4.How is shipping managed for MAX6865UK31D1S+T?
MAX6865UK31D1S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK31D1S+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 MAX6865UK31D1S+T?
For technical support, including MAX6865UK31D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK31D1S+T requirements.
6.How does Aetrix verify that MAX6865UK31D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK31D1S+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 MAX6865UK31D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK31D1S+T?
All MAX6865UK31D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK31D1S+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 MAX6865UK31D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK31D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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