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Analog Devices Inc./Maxim Integrated MAX6865UK37D4S+T
- Part No.:
- MAX6865UK37D4S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK37D4S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,624
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Product details
Overview
The MAX6865UK37D4S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer (WDI) functions. It asserts an active-low push-pull RESET when VCC drops below 3.608V (typ), MR is pulled low, or WDI fails to toggle within 3.3s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset down to VCC = +1.1V.
For engineers reviewing the MAX6865UK37D4S+T datasheet, MAX6865UK37D4S+T pinout, MAX6865UK37D4S+T application, or MAX6865UK37D4S+T equivalent, this device serves as a critical power-on reset and software fault recovery element in battery-constrained portable medical and consumer electronics where supply stability, timing predictability, and sub-µA quiescent current are mandatory.
Technical Context
The MAX6865UK37D4S+T implements a dual-threshold voltage monitor with factory-trimmed 3.608V (±2.5%) reset threshold and 0.5% hysteresis, ensuring immunity to short VCC transients (e.g., ≤40µs at 100mV overdrive). Its watchdog timer detects WDI inactivity with 3.3s typical timeout (S-suffix), clearing on any rising/falling edge and pausing during RESET assertion.
This device integrates a 10kΩ internal MR pullup, supports 1200ms minimum reset timeout (D4 suffix), and delivers push-pull active-high RESET output referenced to VCC - requiring no external components beyond a 0.1µF VCC bypass capacitor. It operates across –40°C to +85°C and remains functional down to VCC = 1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.608V (typ), ±2.5% tolerance - ensures reliable brownout detection at nominal 3.6V rail without external calibration |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation on coin-cell batteries in always-on patient monitors |
| Reset Timeout | 1200ms (min) - provides sufficient hold time for slow-starting µPs and peripheral initialization sequences |
| Watchdog Timeout | 3.3s (typ), S-suffix - balances fault coverage and software execution margin for embedded firmware loops |
| VCC Range | 1.2V to 5.5V - supports direct interfacing with 1.8V, 2.5V, 3.3V, and 5V logic domains without level shifters |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup resistor and ensures defined logic state during VCC ramp |
| Operating Temp | –40°C to +85°C - qualified for industrial and portable medical environments including glucose monitors |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during fault condition; sinks/source current per VOH/VOL specs; no external pullup required |
| 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; accepts CMOS logic; 1µs minimum pulse width |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on transition; immune to <150ns glitches |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF ceramic bypass to GND near pin |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in low-duty-cycle medical wearables |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - ensures fail-safe behavior during deep brownout |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy power environments |
| No external components | Integrates MR pullup, precision voltage reference, and watchdog oscillator - reduces BOM count and layout area |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance eliminates need for external resistor networks or calibration |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET on VCC brownout or firmware hang detected via WDI timeout. Use Value: Prevents corrupted sensor readings or failed BLE handshakes by enforcing clean µP restart before data transmission. |
Use Scenario: Portable ECG or SpO₂ units operating from single AAA alkaline cells. IC Role / Device Role / Timing Role: Voltage monitor and watchdog co-processor ensuring safe boot and runtime fault recovery. Use Value: Guarantees clinical-grade reliability with 1200ms reset hold time accommodating slow analog front-end stabilization. |
| MP3 Players | Smart Pagers |
Use Scenario: Flash-based audio players with dynamic voltage scaling and deep-sleep modes. IC Role / Device Role / Timing Role: Power-on reset generator and software watchdog enforcing firmware integrity after wake-up. Use Value: Eliminates frozen UI states by resetting the µP if WDI is not toggled within 3.3s during playback loop execution. |
Use Scenario: Two-way pagers with intermittent RF reception and long standby periods. IC Role / Device Role / Timing Role: Nanopower supervisor maintaining reset readiness while drawing <200nA during 99% of operation. Use Value: Extends battery life to >1 year on CR2032 by minimizing quiescent current without sacrificing fault coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK37D4S+T | Same 3.608V threshold, 1200ms timeout, and 3.3s watchdog - but features active-low push-pull RESET output instead of active-high. | Requires redesign of RESET net polarity; incompatible with µPs expecting active-high reset assertion. | Select when existing schematic uses active-low reset logic and board layout cannot accommodate signal inversion. |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog; 1.6µA ICC - 10× higher quiescent current than MAX6865UK37D4S+T. | Suitable only for non-battery-critical applications; lacks WDI fault coverage and nanopower operation. | Choose only if cost sensitivity outweighs battery life requirements and watchdog functionality is unnecessary. |
Compared with MAX6865UK37D4S+T, MAX6864UK37D4S+T offers identical supervision parameters but inverted RESET polarity, while TPS3836K33DBVR trades nanopower operation and watchdog capability for lower unit cost and simpler integration in line-powered systems.
Availability
MAX6865UK37D4S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and smart pagers requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for MAX6865UK37D4S+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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family delivers nanopower supervisory functionality targeting battery-operated portable electronics where ultra-low ICC, guaranteed reset validity down to 1.1V, and integrated watchdog protection are essential design requirements.
FAQ
What is the exact reset threshold voltage of the MAX6865UK37D4S+T?
The MAX6865UK37D4S+T has a factory-trimmed reset threshold of 3.608V (typical), with ±2.5% tolerance over temperature and process variation. This value corresponds to the '37' suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is guaranteed valid from –40°C to +85°C without external calibration.
Does the MAX6865UK37D4S+T require external components for basic operation?
No, the MAX6865UK37D4S+T requires no external components for core supervision functionality. It integrates a 10kΩ MR pullup resistor, precision voltage reference, and watchdog oscillator. Only a 0.1µF ceramic bypass capacitor between VCC and GND is recommended for noise immunity - no resistors, capacitors, or diodes are needed for reset timing or threshold setting.
What is the function of the WDI pin on the MAX6865UK37D4S+T?
The WDI (Watchdog Input) pin on the MAX6865UK37D4S+T monitors microprocessor activity: if WDI remains static (high or low) for longer than 3.3s (typical, S-suffix), the internal watchdog timer expires and triggers a reset for 1200ms. The timer clears on any rising or falling edge at WDI and pauses while RESET is asserted.
Can the MAX6865UK37D4S+T operate reliably at VCC = 1.2V?
Yes, the MAX6865UK37D4S+T is fully specified to operate at VCC = 1.2V (minimum), with guaranteed reset assertion and valid RESET output down to VCC = +1.1V. Its 170nA typical supply current and functional reset behavior at this voltage make it suitable for ultra-low-voltage energy-harvesting or coin-cell systems.
How does the MAX6865UK37D4S+T differ from the MAX6864UK37D4S+T?
The MAX6865UK37D4S+T and MAX6864UK37D4S+T share identical reset threshold (3.608V), timeout (1200ms), and watchdog period (3.3s), but differ in RESET output polarity: MAX6865UK37D4S+T provides active-high push-pull RESET, while MAX6864UK37D4S+T provides active-low push-pull RESET - requiring corresponding µP interface compatibility verification.
MAX6865UK37D4S+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:
- 3.7V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK37D4S+T FAQ
1.How can I place an order for MAX6865UK37D4S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK37D4S+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 MAX6865UK37D4S+T reliable?
The price and inventory of MAX6865UK37D4S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK37D4S+T is usually 5 days.
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Once your MAX6865UK37D4S+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 MAX6865UK37D4S+T?
For technical support, including MAX6865UK37D4S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK37D4S+T requirements.
6.How does Aetrix verify that MAX6865UK37D4S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK37D4S+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 MAX6865UK37D4S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK37D4S+T?
All MAX6865UK37D4S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK37D4S+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 MAX6865UK37D4S+T part is unused and in its original packaging.
Return procedure for MAX6865UK37D4S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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