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Analog Devices Inc./Maxim Integrated MAX6865UK28D4L+T
- Part No.:
- MAX6865UK28D4L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK28D4L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
The MAX6865UK28D4L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.800V reset threshold (suffix '28'), 1200ms minimum reset timeout (suffix 'D4'), and 209s typical watchdog timeout (suffix 'L'). It monitors VCC, asserts active-high push-pull RESET on brownout/manual reset/watchdog expiry, and supports battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK28D4L+T datasheet, MAX6865UK28D4L+T pinout, MAX6865UK28D4L+T application, or MAX6865UK28D4L+T equivalent, this page delivers verified electrical specs, functional pin mapping, real-world use cases, and validated alternative options for low-power µP reset and watchdog supervision.
Technical Context
The MAX6865UK28D4L+T integrates voltage monitoring, manual reset input (MR), and watchdog timer with WDI input-triggering RESET when VCC falls below 2.800V, MR is pulled low, or WDI remains static beyond 209s (typ). Its internal timer guarantees RESET remains asserted for ≥1200ms after recovery.
Designed for ultra-low-power operation, it maintains guaranteed reset validity down to VCC = +1.1V, features 200ns MR glitch rejection, and draws only 170nA (typ) at 2.5V/25°C-enabling multi-year battery life in glucose monitors and wearables.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at 2.5V/25°C - enables >10-year coin-cell operation in always-on medical sensors |
| Reset Threshold | 2.800V ±2.5% - factory-trimmed for precise brownout detection on 3.0V or 2.85V rails |
| Reset Timeout | 1200ms minimum - ensures full µP initialization and peripheral stabilization before release |
| Watchdog Timeout | 209s typical (L-suffix) - suitable for infrequent firmware tasks like daily calibration or BLE advertising intervals |
| RESET Output Type | Active-high push-pull - eliminates external pullup, drives directly into CMOS µP reset input |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, alkaline, and regulated 3.3V/2.5V systems |
| Reset Validity Limit | Guaranteed to VCC = +1.1V - ensures deterministic reset assertion during deep brownout |
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 fault; no external pullup required |
| 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 |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising/falling transitions |
| 5 | VCC | Supply voltage input - monitored rail; requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >5-year operation on CR2032 in patient monitors |
| Immunity to VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy environments |
| Guaranteed reset at low VCC | Valid RESET assertion down to VCC = +1.1V - ensures reliability during battery depletion |
| No external components | Internal MR pullup, fixed timing, and factory-trimmed threshold eliminate BOM parts |
| Watchdog edge sensitivity | Detects 150ns WDI pulses - supports fast firmware toggling without timing margin loss |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Supervises 3.0V coin-cell rail and triggers full µP reset if firmware hangs during BLE handshake or sensor readout. Use Value: 209s watchdog timeout aligns with maximum BLE connection interval; 1200ms reset hold ensures ADC and radio initialization completes. |
Use Scenario: Portable ECG patch recording heart rate and SpO₂ for 72-hour clinical trials. IC Role / Device Role / Timing Role: Monitors 2.85V regulated supply and asserts RESET on brownout during battery swap or low-voltage cutoff. Use Value: 2.800V threshold matches LDO output tolerance; 170nA ICC extends runtime by >18 months per CR2477 cell. |
| Industrial Handheld Scanners | Smart Wearable Trackers |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, operating in warehouse RF-noise environments. IC Role / Device Role / Timing Role: Provides MR-initiated reset via physical button and detects µP lockup during motor driver faults. Use Value: 200ns MR glitch rejection prevents false triggers from ESD events; push-pull RESET drives 10kΩ µP input directly. |
Use Scenario: Fitness tracker with motion sensor, OLED display, and BLE SoC running intermittent firmware tasks. IC Role / Device Role / Timing Role: Watches WDI toggled once per minute during sleep mode; resets on missed toggle due to memory corruption. Use Value: 209s watchdog period accommodates longest firmware task without false timeout; 1.2–5.5V range supports buck-boost power architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK28D4L+T | Same 2.800V threshold, 1200ms timeout, 209s watchdog, but active-low open-drain RESET output | Requires external pullup resistor; incompatible with µP reset inputs expecting active-high logic | Select only if system design already uses open-drain reset signaling and level-shifting is needed |
| TPS3837K28DBVR | 2.80V threshold, 1200ms timeout, no watchdog; 2.5µA ICC (15× higher than MAX6865UK28D4L+T) | Lacks WDI functionality; unsuitable for firmware hang detection in unattended devices | Choose only for cost-sensitive, non-watchdog applications where 2.5µA ICC is acceptable |
Compared with MAX6864UK28D4L+T and TPS3837K28DBVR, the MAX6865UK28D4L+T uniquely combines ultra-low ICC, active-high push-pull RESET, and integrated watchdog-making it optimal for battery-critical, self-monitoring portable medical devices.
Availability
MAX6865UK28D4L+T is available at Aetrix Electronics and suitable for glucose monitors, patient loggers, industrial scanners, and smart wearables requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK28D4L+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 and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-constrained portable and medical electronics-prioritizing ultra-low ICC, guaranteed low-VCC operation, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK28D4L+T?
The MAX6865UK28D4L+T has a factory-trimmed reset threshold of 2.800V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix '28' corresponds to 2.800V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for deep brownout detection in battery-powered systems.
Does the MAX6865UK28D4L+T require an external pullup resistor on the RESET pin?
No, the MAX6865UK28D4L+T features an active-high push-pull RESET output, which actively drives high during reset assertion and low during deassertion. Unlike open-drain variants, it does not require an external pullup resistor-reducing BOM count and simplifying layout. This is explicitly stated in the MAX6865 pin description and functional diagram.
How does the watchdog timer in the MAX6865UK28D4L+T respond to WDI signal edges?
The MAX6865UK28D4L+T watchdog timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static (high or low) for longer than the 209s typical timeout period. It detects pulses as short as 150ns and resumes counting immediately after RESET deasserts-ensuring robust firmware execution monitoring without false timeouts.
What is the minimum VCC voltage at which the MAX6865UK28D4L+T guarantees valid RESET output?
The MAX6865UK28D4L+T guarantees valid RESET output down to VCC = +1.1V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset behavior during severe brownout conditions-critical for medical devices using aging primary batteries where voltage decay below 1.2V is common.
Can the MAX6865UK28D4L+T be used with a 1.8V supply rail?
Yes, the MAX6865UK28D4L+T operates across VCC = 1.2V to 5.5V, fully supporting 1.8V systems. Its 170nA typical supply current and 2.800V reset threshold remain valid at 1.8V, and its RESET output meets VOH/VOL specs (e.g., VOH ≥ 0.8×VCC at ISOURCE = 200µA). This makes it suitable for low-voltage µPs and SoCs in modern portable electronics.
MAX6865UK28D4L+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:
- 2.8V
- 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
MAX6865UK28D4L+T FAQ
1.How can I place an order for MAX6865UK28D4L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK28D4L+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 MAX6865UK28D4L+T reliable?
The price and inventory of MAX6865UK28D4L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK28D4L+T is usually 5 days.
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Once your MAX6865UK28D4L+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 MAX6865UK28D4L+T?
For technical support, including MAX6865UK28D4L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK28D4L+T requirements.
6.How does Aetrix verify that MAX6865UK28D4L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK28D4L+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 MAX6865UK28D4L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK28D4L+T?
All MAX6865UK28D4L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK28D4L+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 MAX6865UK28D4L+T part is unused and in its original packaging.
Return procedure for MAX6865UK28D4L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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