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Analog Devices Inc./Maxim Integrated MAX6865UK45D3L+T
- Part No.:
- MAX6865UK45D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK45D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,170
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Product details
Overview
MAX6865UK45D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.500V reset threshold (±2.5%), 150ms 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 MAX6865UK45D3L+T datasheet, MAX6865UK45D3L+T pinout, MAX6865UK45D3L+T application, or MAX6865UK45D3L+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, and real-world design implications - not generic timing IC descriptions.
Technical Context
The MAX6865UK45D3L+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality in a single BiCMOS IC. Its reset output remains asserted for ≥150ms after VCC exceeds 4.500V and MR deasserts, while the watchdog timer expires if WDI remains static >209s (typ), triggering a full reset cycle.
This device guarantees valid reset operation down to VCC = +1.1V and exhibits immunity to VCC transients ≤40µs at 100mV overdrive. It uses internal 10kΩ MR pullup and supports push-pull active-high RESET output referenced to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold | 4.500V ±2.5%; factory-trimmed for precise 3.3V/5V rail supervision without external resistors. |
| Reset Timeout | 150ms min (D3 option); ensures µP completes power-up sequencing before release. |
| Watchdog Timeout | 209s typ (L suffix); detects long-duration firmware hangs in low-duty-cycle embedded systems. |
| VCC Operating Range | 1.2V to 5.5V; supports operation across Li-ion, coin-cell, and regulated rails. |
| Reset Output Type | Push-pull active-high; drives µP reset pin directly without external pullup or level-shifting. |
| Guaranteed Reset Validity | To VCC = +1.1V; maintains deterministic reset state during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint ideal for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; asserts high during fault conditions and holds for ≥150ms post-recovery. |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane with low-inductance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic or momentary switch to GND. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on each transition; pulse width ≥150ns guaranteed. |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF ceramic 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 patient monitors. |
| Factory-trimmed VTH | 4.500V ±2.5% threshold eliminates calibration overhead and reduces BOM count. |
| No external components | Self-contained supervision: no external R/C network needed for reset timing or threshold setting. |
| Watchdog immunity to stuck loops | WDI edge-triggered clearing prevents false resets during repetitive software polling patterns. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive-critical for noisy DC-DC converter outputs. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V MCU supply and triggers hardware reset if firmware hangs during sensor readout or radio handshake. Use Value: Prevents missed hypoglycemia alerts by enforcing deterministic recovery from undetected software faults. |
Use Scenario: Portable ECG/SpO₂ units powered by single CR2032 coin cell with multi-week standby. IC Role / Device Role / Timing Role: Monitors VCC during battery discharge curve; asserts reset before MCU enters undefined state below 2.2V. Use Value: Eliminates field failures caused by marginal supply voltage during clinical use in emergency settings. |
| Industrial Handheld Scanners | Smart Wearables |
Use Scenario: Rugged barcode scanners operating in warehouses with intermittent USB charging and vibration-induced power noise. IC Role / Device Role / Timing Role: Provides MR-initiated reset for field firmware updates and watchdog supervision of motor control firmware. Use Value: Ensures reliable boot after hot-plug events and prevents corrupted flash writes during power interruption. |
Use Scenario: Fitness trackers with heart-rate sensor, accelerometer, and BLE SoC running duty-cycled firmware. IC Role / Device Role / Timing Role: Watches WDI toggled by main loop heartbeat; resets SoC if motion algorithm freezes or sensor FIFO overflows. Use Value: Maintains data integrity and user trust by auto-recovering from sensor stack deadlocks without user intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK45D3S+T | Same 4.500V threshold and D3 timeout, but 3.3s watchdog (S suffix) instead of 209s (L). | Better suited for fast-response systems like USB peripherals where lockup detection must occur within seconds. | Select MAX6864UK45D3S+T when firmware hang recovery time budget is <5s; MAX6865UK45D3L+T for infrequent, long-duration processes. |
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog, 1.5µA ICC - 9× higher quiescent current. | Lacks WDI functionality; requires external circuitry for software supervision; unsuitable for ultra-low-power medical devices. | Choose TPS3837K33DBVR only for cost-sensitive, non-battery applications where watchdog is handled in firmware. |
Compared with MAX6864UK45D3S+T and TPS3837K33DBVR, the MAX6865UK45D3L+T uniquely balances nanoscale current draw, precise 4.5V threshold, and long-interval watchdog coverage - making it optimal for battery-powered medical devices requiring both extended shelf life and robust firmware fault recovery.
Availability
MAX6865UK45D3L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, industrial handheld scanners, and smart wearables requiring stable component supply across multi-year production cycles.
Supply support for MAX6865UK45D3L+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 demanding industrial, medical, and communications applications.
The MAX68xx family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, factory-trimmed accuracy, and integrated watchdog functionality without external components.
FAQ
What is the exact reset threshold voltage of the MAX6865UK45D3L+T?
The MAX6865UK45D3L+T has a factory-trimmed reset threshold of +4.500V 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 "45" corresponds to 4.500V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, supporting operation across wide battery discharge curves.
Does the MAX6865UK45D3L+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK45D3L+T includes a watchdog timer with a typical timeout period of 209s (L suffix), with min/max values of 95s and 487s respectively. The timer clears on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this interval - enabling detection of long-duration firmware hangs in low-duty-cycle applications like glucose monitors.
What is the reset output configuration of the MAX6865UK45D3L+T?
The MAX6865UK45D3L+T features a push-pull active-high RESET output (pin 1), as confirmed in the MAX6865-specific pin description on page 8 of the datasheet. This output drives high during reset assertion and low during normal operation, eliminating need for external pullup resistors and simplifying interface to µP reset pins expecting active-high logic.
How does the MAX6865UK45D3L+T achieve ultra-low supply current?
The MAX6865UK45D3L+T achieves 170nA typical supply current through BiCMOS process optimization and dynamic circuit gating. Its current draw remains stable across VCC (1.2V–5.5V) and temperature (-40°C to +85°C), as shown in Figure toc02. This enables multi-year operation on coin cells - critical for wearable and medical devices where battery replacement is impractical.
Can the MAX6865UK45D3L+T be used with a 1.8V microcontroller supply rail?
Yes, the MAX6865UK45D3L+T operates across VCC = 1.2V to 5.5V and guarantees valid reset behavior down to VCC = +1.1V. Its 4.500V reset threshold is intended for monitoring higher rails (e.g., 5V or 3.3V system supplies), but the IC itself can be powered from 1.8V while supervising a separate 4.5V domain - provided VCC ≥ 1.2V per Absolute Maximum Ratings.
MAX6865UK45D3L+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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK45D3L+T FAQ
1.How can I place an order for MAX6865UK45D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK45D3L+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 MAX6865UK45D3L+T reliable?
The price and inventory of MAX6865UK45D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK45D3L+T is usually 5 days.
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Once your MAX6865UK45D3L+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 MAX6865UK45D3L+T?
For technical support, including MAX6865UK45D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK45D3L+T requirements.
6.How does Aetrix verify that MAX6865UK45D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK45D3L+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 MAX6865UK45D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK45D3L+T?
All MAX6865UK45D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK45D3L+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 MAX6865UK45D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK45D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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