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Analog Devices Inc./Maxim Integrated MAX6865UK36D3L+T
- Part No.:
- MAX6865UK36D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK36D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,564
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Product details
Overview
The MAX6865UK36D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.6V reset threshold (±2.5%), 300ms minimum reset timeout, and integrated watchdog timer with 209s typical timeout. It monitors VCC, accepts manual reset (MR), and asserts active-high push-pull RESET during brownout, power-up, or watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK36D3L+T datasheet, MAX6865UK36D3L+T pinout, MAX6865UK36D3L+T application, or MAX6865UK36D3L+T equivalent, key selection criteria include guaranteed RESET validity down to VCC = +1.1V, immunity to sub-40µs VCC transients, MR glitch rejection (200ns), and compatibility with 1.2V–5.5V supply rails in space-constrained portable systems.
Technical Context
This device implements a precision voltage monitor with hysteresis (0.5% of VTH), a monolithic watchdog timer that clears on any WDI edge and expires if WDI remains static >209s (typ), and a fixed 300ms reset timeout after VCC recovery or MR deassertion. The internal 10kΩ MR pullup enables direct switch interfacing without external components.
The active-high push-pull RESET output is referenced to VCC and delivers VOH ≥ 0.8×VCC (ISOURCE = 500µA) and VOL ≤ 0.3V (ISINK = 1.2mA), ensuring robust logic-level compatibility across 1.71V–5.5V operation. No external capacitor or resistor is required for basic functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V; enables multi-year battery life in always-on medical sensors. |
| Reset Threshold | 3.600V ±2.5% (VTH = 3.510V–3.690V); factory-trimmed for precise 3.3V rail supervision. |
| Reset Timeout | 300ms min (D3 option); holds µP in reset long enough for full power stabilization. |
| Watchdog Timeout | 209s typ (L suffix); supports long-loop firmware without spurious resets. |
| VCC Operating Range | 1.2V to 5.5V; functions across Li-ion, coin-cell, and regulated 3.3V/5V supplies. |
| RESET Validity | Guaranteed to VCC = +1.1V; ensures deterministic reset assertion during deep brownout. |
| MR Glitch Rejection | 200ns; rejects noise spikes on manual reset line without external filtering. |
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 during fault conditions; no external pullup needed. |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS levels. |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears timer on each transition; 150ns pulse capable. |
| 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 extends battery life in portable medical devices beyond 5 years. |
| No external components | Integrated MR pullup (10kΩ), no timing capacitors, and no reset pullup resistors reduce BOM count by 3–5 parts. |
| VCC transient immunity | Immune to 100mV VCC glitches ≤40µs duration, eliminating false resets in noisy power environments. |
| Guaranteed low-VCC operation | RESET remains valid down to VCC = +1.1V, enabling reliable reset assertion during deep undervoltage events. |
| Watchdog edge sensitivity | Clears on any WDI edge (not level), supporting flexible firmware watchdog strobing without strict timing windows. |
Applications
| Glucose Monitor Power Management | Patient Monitor Brownout Protection |
|---|---|
|
Use Scenario: Continuous glucose sensing with coin-cell battery and low-power MCU. IC Role / Device Role / Timing Role: Supervises 3.3V rail, triggers reset on battery sag below 3.6V, and resets MCU if firmware hangs. Use Value: Prevents corrupted sensor readings during brownout and ensures safe restart after watchdog timeout (209s). |
Use Scenario: Portable ECG device powered by rechargeable Li-ion with variable voltage discharge profile. IC Role / Device Role / Timing Role: Monitors main 3.3V supply, asserts RESET during VCC drop below 3.6V, and validates reset down to 1.1V. Use Value: Guarantees deterministic MCU reset even during deep battery depletion, avoiding unsafe undefined states. |
| Handheld Diagnostic Tool | Wearable Vital Sign Sensor |
|
Use Scenario: Battery-operated handheld spirometer with ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Provides 300ms reset hold time after power-up and manual reset via tactile button on MR pin. Use Value: Ensures full MCU initialization before firmware execution, eliminating boot failures due to premature clock enable. |
Use Scenario: Ultra-low-power wearable pulse oximeter using CR2032 coin cell. IC Role / Device Role / Timing Role: Combines VCC supervision, MR input for user-initiated recalibration, and watchdog monitoring of optical sampling loop. Use Value: Achieves <200nA system quiescent current while maintaining fail-safe reset behavior across temperature (-40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK36D3S+T | Same 3.6V threshold and D3 timeout, but 3.3s (S) watchdog instead of 209s (L). | Suitable for short-loop firmware where fast watchdog response is preferred over long-duration supervision. | Select MAX6864UK36D3S+T when firmware executes tight loops requiring sub-5s watchdog clearing. |
| TPS3836K33DBVR | 3.08V fixed threshold, 200ms timeout, no watchdog, push-pull active-low RESET. | Lacks watchdog and MR input; limited to basic voltage monitoring in non-critical applications. | Choose TPS3836K33DBVR only for cost-sensitive designs omitting watchdog and manual reset requirements. |
Compared with MAX6864UK36D3S+T and TPS3836K33DBVR, the MAX6865UK36D3L+T uniquely combines 3.6V supervision, 300ms reset hold, and long-interval (209s) watchdog - essential for medical devices with infrequent but safety-critical firmware tasks.
Availability
MAX6865UK36D3L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered diagnostic tools, and wearable vital sign sensors requiring stable component supply with long-term lifecycle support.
Supply support for MAX6865UK36D3L+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 MAX6854–MAX6869 family delivers nanopower supervisory functionality targeting battery-critical portable electronics, with emphasis on ultra-low ICC, wide VCC range, and integrated watchdog for safety-compliant firmware monitoring.
FAQ
What is the exact reset threshold voltage of the MAX6865UK36D3L+T?
The MAX6865UK36D3L+T has a factory-trimmed reset threshold of 3.600V with ±2.5% tolerance (3.510V to 3.690V), corresponding to the "36" suffix per Maxim's Threshold Suffix Guide. This value is guaranteed over -40°C to +85°C and ensures precise supervision of 3.3V nominal rails with adequate margin.
Does the MAX6865UK36D3L+T require external components for basic operation?
No. The MAX6865UK36D3L+T operates autonomously with no external components: MR is internally pulled up to VCC (10kΩ), RESET is push-pull active-high (no pullup needed), and VCC bypassing uses only a standard 0.1µF capacitor. This eliminates BOM overhead and PCB area in space-constrained designs.
How does the watchdog timer in the MAX6865UK36D3L+T function?
The MAX6865UK36D3L+T watchdog timer expires if the WDI pin remains static (high or low) for longer than 209s (typ). It clears on any rising or falling edge at WDI and resumes counting immediately after RESET deasserts. Pulse width sensitivity is 150ns, supporting flexible firmware strobing without strict timing constraints.
What is the minimum VCC voltage at which MAX6865UK36D3L+T guarantees RESET validity?
The MAX6865UK36D3L+T guarantees RESET output validity down to VCC = +1.1V across the full temperature range (-40°C to +85°C). Below this, RESET may become indeterminate - a critical specification for reliable brownout handling in medical-grade battery-powered equipment.
Is the MAX6865UK36D3L+T pin-compatible with other devices in the MAX68xx family?
Yes - the MAX6865UK36D3L+T shares the identical 5-pin SOT23-5 pinout with all MAX6864–MAX6869 variants. Pin 1 is RESET (active-high push-pull), Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC. This allows drop-in replacement within the same functional subgroup when adjusting watchdog timeout or reset polarity.
MAX6865UK36D3L+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:
- 3.6V
- 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
MAX6865UK36D3L+T FAQ
1.How can I place an order for MAX6865UK36D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK36D3L+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 MAX6865UK36D3L+T reliable?
The price and inventory of MAX6865UK36D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK36D3L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK36D3L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK36D3L+T transactions.
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4.How is shipping managed for MAX6865UK36D3L+T?
MAX6865UK36D3L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK36D3L+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 MAX6865UK36D3L+T?
For technical support, including MAX6865UK36D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK36D3L+T requirements.
6.How does Aetrix verify that MAX6865UK36D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK36D3L+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 MAX6865UK36D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK36D3L+T?
All MAX6865UK36D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK36D3L+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 MAX6865UK36D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK36D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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