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Analog Devices Inc./Maxim Integrated MAX6865UK16D4L+T
- Part No.:
- MAX6865UK16D4L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK16D4L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,874
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Product details
Overview
MAX6865UK16D4L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 1.575V reset threshold, 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 power-on reset and code-execution error recovery.
For engineers reviewing the MAX6865UK16D4L+T datasheet, MAX6865UK16D4L+T pinout, MAX6865UK16D4L+T application, or MAX6865UK16D4L+T equivalent, this device delivers guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, and push-pull active-high RESET output - critical for low-voltage, long-battery-life embedded systems requiring deterministic reset behavior under brownout and software fault conditions.
Technical Context
The MAX6865UK16D4L+T integrates voltage monitoring, a manual reset input (MR), and a watchdog timer that triggers reset if WDI remains static beyond 209s (typ). Its internal reset timeout generator enforces a fixed 1200ms minimum assertion period after VCC recovery or MR deassertion.
It uses BiCMOS process technology (2848 transistors) and features guaranteed operation from -40°C to +85°C. The push-pull active-high RESET output is referenced to VCC and sinks ≤0.3V at 1.2mA load, while MR includes a 10kΩ internal pullup and rejects <200ns glitches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold Voltage | 1.575V ±2.5% - factory-trimmed for precise brownout detection at low-voltage logic rails. |
| Reset Timeout Period | 1200ms minimum - ensures full µP initialization and firmware handshaking before release. |
| Watchdog Timeout | 209s typical (L-suffix) - supports long-loop firmware without spurious resets in patient monitors. |
| VCC Operating Range | 1.2V to 5.5V - compatible with single-cell Li-ion, coin-cell, and 3.3V/5V system rails. |
| RESET Output Type | Push-pull active-high - eliminates external pullup, drives high-impedance µP reset inputs directly. |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint-compatible with TPS3836/TPS3837/TPS3838.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault; no external pullup required. |
| 2 | GND | Ground reference - must be connected to system common ground plane for noise immunity. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-level signals. |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising/falling transitions; detects ≥150ns pulses. |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - reduces quiescent drain in always-on medical sensors and wearables. |
| Watchdog timer with L-suffix | 209s typical timeout - accommodates long-latency sensor polling or communication handshakes. |
| Reset validity to 1.1V | Ensures reset signal integrity even as battery voltage collapses below logic thresholds. |
| No external components | Eliminates BOM cost and layout area - only 0.1µF VCC bypass cap required. |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets in noisy power environments. |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises VCC during battery discharge and initiates hard reset if firmware hangs during RF handshake. Use Value: Prevents missed hypoglycemia alerts by enforcing full µP restart after watchdog timeout, leveraging 209s window to cover BLE connection retries. |
Use Scenario: Multi-parameter bedside monitor with ECG, SpO₂, and NIBP modules sharing a single µP. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts active-high RESET to hold µP in reset until all analog subsystems stabilize post-power-up. Use Value: Guarantees synchronized initialization across sensor chains using 1200ms timeout - longer than slowest ADC settling time. |
| Portable Medical Pagers | Low-Power Wearables |
Use Scenario: Emergency alert pager powered by CR2032 coin cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Provides brownout reset at 1.575V threshold and extends battery life via 170nA ICC. Use Value: Enables >8 years of standby operation while maintaining guaranteed reset assertion down to VCC = 1.1V during final battery depletion. |
Use Scenario: Fitness tracker with motion-sensing MCU entering deep-sleep between accelerometer wakeups. IC Role / Device Role / Timing Role: Watches WDI toggled by MCU's periodic wakeup pulse; triggers reset if motion algorithm locks up. Use Value: Uses 209s watchdog window to tolerate extended sleep intervals while catching firmware freezes during sensor fusion computation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6865UK16D4S+T | Same package and pinout; watchdog timeout reduced to 3.3s (S-suffix) instead of 209s (L-suffix). | Better suited for fast-recovery systems like MP3 players where rapid reset response is prioritized over long-loop tolerance. | Select when firmware execution loops are short and deterministic; avoid for medical devices requiring long watchdog windows. |
| TPS3836K33DBVR | 3.3V fixed reset threshold (vs. 1.575V), 200ms timeout, no watchdog, SOT23-5 package. | Lacks watchdog and manual reset; suitable only for basic power-monitoring without software fault coverage. | Choose only for cost-sensitive, non-critical applications where brownout detection suffices and firmware reliability is externally managed. |
Compared with MAX6865UK16D4L+T, the S-suffix variant trades long watchdog latency for faster fault response, while TPS3836K33DBVR omits both watchdog and manual reset - making MAX6865UK16D4L+T uniquely suited for safety-critical, low-power medical supervision requiring dual-fault coverage and ultra-low ICC.
Availability
MAX6865UK16D4L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, portable medical pagers, and low-power wearables requiring stable component supply across long production lifecycles and stringent regulatory traceability.
Supply support for MAX6865UK16D4L+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 industrial, medical, and communications applications, emphasizing low power, high reliability, and integration.
The MAX6854–MAX6869 family was engineered specifically for nanopower supervisory functions in battery-constrained medical and portable electronics, combining voltage monitoring, manual reset, and configurable watchdog timing in minimal footprint.
FAQ
What is the reset threshold voltage of the MAX6865UK16D4L+T?
The MAX6865UK16D4L+T has a factory-trimmed reset threshold voltage of +1.575V, with ±2.5% tolerance over temperature. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "16" corresponds to 1.575V. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for deep-brownout scenarios in coin-cell-powered devices.
Does the MAX6865UK16D4L+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK16D4L+T includes a watchdog timer with a typical timeout of 209s, indicated by the "L" suffix in the part number. This is verified in Table 3 (Watchdog Timeout) and the Ordering Information section, which specifies "L" for long timeout (95s to 487s min/max). The timer clears on any WDI edge and expires only if WDI remains static beyond the timeout window.
What type of reset output does the MAX6865UK16D4L+T provide?
The MAX6865UK16D4L+T provides a push-pull active-high RESET output, as confirmed by the Pin Description table for MAX6865 (page 8) and Selector Guide (page 16). Pin 1 is labeled RESET and functions as an active-high output referenced to VCC, eliminating need for external pullup resistors and enabling direct interface with µP reset inputs requiring high-level assertion.
What is the minimum reset timeout period for the MAX6865UK16D4L+T?
The MAX6865UK16D4L+T has a minimum reset timeout period of 1200ms, denoted by the "D4" suffix per Table 4 (Reset Timeout Periods). This value is guaranteed across -40°C to +85°C and ensures sufficient time for µP core, PLLs, and peripherals to fully initialize before release - critical in multi-rail medical systems with staggered power sequencing.
Is the MAX6865UK16D4L+T RoHS-compliant and lead-free?
Yes, the "+T" suffix in MAX6865UK16D4L+T explicitly indicates lead-free, RoHS-compliant packaging per Maxim's ordering conventions. The datasheet states: "Specify lead-free by replacing '-T' with '+T' when ordering," confirming compliance with EU RoHS Directive 2011/65/EU and JEDEC J-STD-609 moisture sensitivity level 1 rating for the SOT23-5 package.
MAX6865UK16D4L+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:
- 1.575V
- 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
MAX6865UK16D4L+T FAQ
1.How can I place an order for MAX6865UK16D4L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK16D4L+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 MAX6865UK16D4L+T reliable?
The price and inventory of MAX6865UK16D4L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK16D4L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK16D4L+T?
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4.How is shipping managed for MAX6865UK16D4L+T?
MAX6865UK16D4L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK16D4L+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 MAX6865UK16D4L+T?
For technical support, including MAX6865UK16D4L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK16D4L+T requirements.
6.How does Aetrix verify that MAX6865UK16D4L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK16D4L+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 MAX6865UK16D4L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK16D4L+T?
All MAX6865UK16D4L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK16D4L+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 MAX6865UK16D4L+T part is unused and in its original packaging.
Return procedure for MAX6865UK16D4L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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