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Analog Devices Inc./Maxim Integrated MAX6865UK32D4L+T
- Part No.:
- MAX6865UK32D4L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK32D4L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,809
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Product details
Overview
The MAX6865UK32D4L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.2V reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP initialization during brownout or software lockup.
For engineers reviewing the MAX6865UK32D4L+T datasheet, MAX6865UK32D4L+T pinout, MAX6865UK32D4L+T application, or MAX6865UK32D4L+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options for low-power system reset and watchdog supervision.
Technical Context
This device integrates voltage monitoring, manual reset assertion, and watchdog timer functionality into a single BiCMOS IC. Its reset output remains asserted for ≥1200ms after VCC rises above 3.2V or MR deasserts, and its watchdog timer expires if WDI remains static beyond 209s (typ), triggering a full reset sequence.
The MAX6865UK32D4L+T uses push-pull active-high RESET output referenced to VCC, supports operation down to VCC = 1.1V with guaranteed reset validity, and features internal 10kΩ MR pullup and 20nA WDI input current - enabling direct CMOS-level interfacing without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold | 3.200V ±2.5% - factory-trimmed for precise brownout detection on 3.3V systems. |
| Reset Timeout | 1200ms min - ensures µP completes full power-up initialization before release. |
| Watchdog Timeout | 209s typ (L-suffix) - suitable for long-cycle firmware tasks without spurious resets. |
| VCC Operating Range | 1.2V to 5.5V - supports Li-ion, coin-cell, and multi-rail embedded systems. |
| Reset Output Type | Push-pull active-high - eliminates need for external pullup and simplifies µP interface. |
| Guaranteed Reset Validity | To VCC = +1.1V - maintains deterministic reset state during deep brownout. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives high when VCC < 3.2V, MR low, or WDI timeout occurs; remains high ≥1200ms after recovery. |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; 1µs minimum pulse width; 250ns MR-to-reset delay. |
| 4 | WDI | Watchdog input; clears internal timer on any edge (rising/falling); 150ns minimum pulse width; 20nA input current. |
| 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 enables >10-year battery life in always-on medical wearables. |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets in noisy automotive or industrial environments. |
| No external components | Integrates MR pullup, timing capacitor, and watchdog oscillator - reduces BOM count and PCB area. |
| Valid reset down to 1.1V | Ensures deterministic µP behavior during deep undervoltage conditions where most supervisors fail. |
| Watchdog edge-triggered clear | WDI accepts 150ns pulses and clears timer on any transition - supports low-duty-cycle firmware heartbeat signals. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail and triggers hardware reset if MCU hangs during sensor calibration or radio handshake. Use Value: Prevents missed hypoglycemia alerts by enforcing full µP restart within 209s of software freeze. |
Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules sharing a single ARM Cortex-M4. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and asserts active-high RESET to hold µP in reset until stable post-brownout. Use Value: Guarantees safe boot sequence and eliminates corrupted waveform data caused by partial power-up. |
| Portable ECG Devices | Smart Pagers |
Use Scenario: Handheld single-lead ECG with rechargeable LiPo battery and 24-bit ADC sampling. IC Role / Device Role / Timing Role: Provides 1200ms reset timeout to accommodate slow analog front-end stabilization before µP firmware execution. Use Value: Eliminates startup glitches that would corrupt first-second ECG trace due to premature µP clock enable. |
Use Scenario: Two-way encrypted pager with persistent memory and low-power wake-on-RF mode. IC Role / Device Role / Timing Role: Uses WDI to verify periodic firmware health checks; resets system if heartbeat signal stops for >209s. Use Value: Recovers from stuck interrupt handlers without user intervention, maintaining message delivery SLA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK32D4L+T | Same 3.2V threshold, 1200ms timeout, and 209s watchdog, but features active-low push-pull RESET output. | Requires µP reset pin configured for active-low assertion; incompatible with active-high-only reset inputs. | Select when target µP demands active-low reset polarity and board layout cannot accommodate level-shifting. |
| TPS3838K33DBVR | 3.08V threshold (±0.5%), 200ms fixed timeout, no watchdog; 1.5µA ICC - 9× higher than MAX6865UK32D4L+T. | Lacks watchdog functionality; insufficient for systems requiring autonomous software fault recovery. | Choose only for cost-sensitive, non-watchdog applications where 1.5µA supply current is acceptable. |
Compared with MAX6864UK32D4L+T and TPS3838K33DBVR, the MAX6865UK32D4L+T uniquely combines ultra-low 170nA current, 1200ms programmable reset hold time, and 209s watchdog - making it optimal for long-life, self-healing medical and portable devices where both power and reliability are critical.
Availability
MAX6865UK32D4L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, portable ECG devices, and smart pagers requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK32D4L+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 MAX6865UK32D4L+T belongs to the MAX68xx nanopower supervisory family, engineered specifically for battery-critical medical and portable electronics needing guaranteed reset integrity and autonomous watchdog supervision.
FAQ
What is the exact reset threshold voltage of the MAX6865UK32D4L+T?
The MAX6865UK32D4L+T has a factory-trimmed reset threshold of 3.200V 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 "32" corresponds to 3.200V nominal. The MAX6865UK32D4L+T maintains this accuracy without external calibration or trimming components.
Does the MAX6865UK32D4L+T support active-high or active-low reset output?
The MAX6865UK32D4L+T provides an active-high push-pull RESET output (Pin 1), as specified in the MAX6865 pin description and Selector Guide. When asserted, RESET goes high; when deasserted, it returns low. This differs from the MAX6864UK32D4L+T (active-low) and MAX6866UK32D4L+T (open-drain active-low), confirming the MAX6865UK32D4L+T's output polarity is fixed and non-configurable.
What is the watchdog timeout period for the MAX6865UK32D4L+T?
The MAX6865UK32D4L+T features a watchdog timeout period of 209s typical (L-suffix), with min/max values of 95s/487s over temperature. This is explicitly defined in Table 3 (Watchdog Timeout) and confirmed in the Ordering Information section, where "L" denotes the long watchdog option. The timer resets on any WDI edge and expires only if WDI remains static beyond this interval.
Can the MAX6865UK32D4L+T operate below 1.8V?
Yes, the MAX6865UK32D4L+T operates from VCC = 1.2V to 5.5V and guarantees valid reset assertion down to VCC = 1.1V. Electrical Characteristics confirm supply voltage minimum of 1.2V (–40°C to +85°C), and the "Guaranteed Reset Valid to VCC = +1.1V" feature ensures deterministic behavior even during deep brownout - critical for coin-cell and energy-harvesting systems.
Is the MR input of the MAX6865UK32D4L+T internally pulled up?
Yes, the MR input (Pin 3) of the MAX6865UK32D4L+T includes an internal 10kΩ pullup resistor to VCC, as documented in the Pin Description table and Applications Information section. This allows MR to be left unconnected or tied directly to VCC when unused, eliminating the need for external biasing and simplifying PCB layout in space-constrained portable designs.
MAX6865UK32D4L+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:
- 3.2V
- 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
MAX6865UK32D4L+T FAQ
1.How can I place an order for MAX6865UK32D4L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK32D4L+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 MAX6865UK32D4L+T reliable?
The price and inventory of MAX6865UK32D4L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK32D4L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK32D4L+T?
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4.How is shipping managed for MAX6865UK32D4L+T?
MAX6865UK32D4L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK32D4L+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 MAX6865UK32D4L+T?
For technical support, including MAX6865UK32D4L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK32D4L+T requirements.
6.How does Aetrix verify that MAX6865UK32D4L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK32D4L+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 MAX6865UK32D4L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK32D4L+T?
All MAX6865UK32D4L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK32D4L+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 MAX6865UK32D4L+T part is unused and in its original packaging.
Return procedure for MAX6865UK32D4L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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