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Analog Devices Inc./Maxim Integrated MAX6865UK30D3L+T
- Part No.:
- MAX6865UK30D3L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK30D3L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,153
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Product details
Overview
The MAX6865UK30D3L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, integrating voltage monitoring (3.000V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout). It asserts an active-high push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, with guaranteed validity down to VCC = +1.1V. It targets ultra-low-power portable medical and consumer devices requiring reliable power-on reset and firmware crash recovery.
For engineers reviewing the MAX6865UK30D3L+T datasheet, MAX6865UK30D3L+T pinout, MAX6865UK30D3L+T application, or MAX6865UK30D3L+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for battery-powered µP systems where supply current <200nA and watchdog immunity to software lockup are critical selection criteria.
Technical Context
The MAX6865UK30D3L+T implements a dual-trigger reset architecture: one path monitors VCC against a precision 3.000V ±2.5% threshold with 150ms minimum timeout (D3 option), while a second path detects WDI inactivity exceeding 209s (L suffix) to trigger reset. Its BiCMOS process enables 170nA typical supply current at 2.5V and operation down to VCC = 1.1V.
It features internal 10kΩ MR pullup, 150ns WDI pulse detection capability, and push-pull RESET output referenced to VCC with VOH ≥ 0.8×VCC (ISOURCE = 500µA) and VOL ≤ 0.3V (ISINK = 1.2mA). The watchdog timer clears on any WDI edge, MR assertion, or RESET assertion - ensuring robust recovery from frozen code execution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.000V ±2.5% - precisely trimmed to monitor 3.0V rails without external resistors |
| Supply Current | 170nA (typ) at 2.5V - enables multi-year battery life in glucose monitors and pagers |
| Reset Timeout | 150ms (min) - ensures µP completes power-up initialization before release |
| Watchdog Timeout | 209s (typ), L-suffix - provides long-duration firmware supervision for low-duty-cycle applications |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and simplifies interface to 3.3V/5V µP reset inputs |
| VCC Validity Range | Guaranteed RESET assertion down to VCC = +1.1V - supports deep brownout detection in Li-ion systems |
| WDI Pulse Detection | 150ns minimum width - immune to noise spikes while capturing valid firmware heartbeat edges |
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 µP reset pin directly; no external components needed |
| 2 | GND | Ground reference - must be connected to system ground plane for stable threshold and timing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic or momentary switch to GND |
| 4 | WDI | Watchdog input - toggling within 209s prevents reset; rising/falling edges clear internal timer |
| 5 | VCC | Supply voltage input - monitored for brownout; bypass with 0.1µF capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell–powered devices |
| Factory-trimmed VTH | 3.000V ±2.5% threshold eliminates calibration overhead and reduces BOM count |
| Watchdog immunity | Clears on any WDI edge - prevents false timeouts during normal firmware polling or ISR handling |
| VCC transient rejection | Immune to 100mV transients ≤40µs - avoids spurious resets in noisy portable environments |
| No external components | Integrated MR pullup, precise threshold, and push-pull RESET eliminate discrete passives |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Portable handheld glucose meters powered by CR2032 coin cells with intermittent usage over multi-year shelf life. IC Role / Device Role / Timing Role: Supervises 3.0V rail during power-up and detects firmware hangs via WDI; asserts active-high RESET to ARM Cortex-M0 µP. Use Value: 170nA ICC extends battery life beyond 5 years; 209s watchdog timeout accommodates deep sleep modes without false triggers. |
Use Scenario: Wearable ECG patches with Bluetooth LE transmission, operating from rechargeable LiPo batteries. IC Role / Device Role / Timing Role: Monitors 3.0V system rail and provides fail-safe reset if BLE stack freezes or sensor ADC locks up. Use Value: Guaranteed RESET validity to VCC = 1.1V ensures reset assertion even during end-of-life battery sag; push-pull output interfaces directly to µP without level-shifting. |
| MP3 Players | Smart Pagers |
|
Use Scenario: Flash-based audio players with NAND storage, requiring clean power-on sequencing and firmware watchdog coverage. IC Role / Device Role / Timing Role: Generates 150ms reset pulse on power-up and triggers reset if main processor fails to toggle WDI every 209s. Use Value: D3 timeout matches typical NAND controller initialization time; 3.000V threshold aligns with regulated 3.0V LDO output. |
Use Scenario: Two-way pagers with low-duty-cycle RF reception and infrequent display updates. IC Role / Device Role / Timing Role: Provides brownout protection during battery insertion/removal and recovers from corrupted message parsing loops. Use Value: MR input allows hardware reset via side button; 150ms reset hold time exceeds µP boot ROM execution window. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK30D3L+T | Active-low push-pull RESET output instead of active-high; identical VTH, timeout, and watchdog specs | Requires µP with active-low reset input; incompatible with active-high reset architectures without inversion logic | Select when interfacing to legacy µPs or ASICs expecting active-low reset assertion |
| TPS3838K33DBVR | 3.08V reset threshold (±0.5%), 200ms timeout, no watchdog; 2.5µA ICC - 15× higher supply current | Lacks watchdog functionality; suitable only for basic voltage monitoring without firmware supervision | Choose only if watchdog is unnecessary and design prioritizes tighter threshold tolerance over battery life |
Compared with MAX6865UK30D3L+T, MAX6864UK30D3L+T offers identical supervision timing but inverted RESET polarity, while TPS3838K33DBVR trades away watchdog capability and nanopower operation for improved threshold accuracy - making MAX6865UK30D3L+T the sole choice for ultra-low-power, watchdog-enabled 3.0V systems.
Availability
MAX6865UK30D3L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and smart pagers requiring stable component supply across extended production lifecycles and battery-operated field deployments.
Supply support for MAX6865UK30D3L+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 connectivity in demanding industrial, medical, and portable applications.
The MAX68xx family delivers nanopower supervisory circuits optimized for battery-critical systems where sub-200nA ICC, factory-trimmed thresholds, and integrated watchdog timers enable reliable µP reset without compromising runtime.
FAQ
What is the exact reset threshold voltage of the MAX6865UK30D3L+T?
The MAX6865UK30D3L+T has a factory-trimmed reset threshold of 3.000V 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 "30" corresponds to 3.000V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, supporting operation during deep brownout conditions.
Does the MAX6865UK30D3L+T require external components for basic operation?
No, the MAX6865UK30D3L+T operates autonomously with zero external components: it includes an internal 10kΩ pullup on MR, a precision trimmed 3.000V threshold, and an active-high push-pull RESET output. Only a 0.1µF bypass capacitor on VCC is recommended for noise immunity - no resistors, capacitors, or diodes are required for core supervision or watchdog functionality.
How does the watchdog timer in the MAX6865UK30D3L+T respond to firmware activity?
The MAX6865UK30D3L+T watchdog timer (209s typical timeout, L-suffix) clears on any rising or falling edge at the WDI pin. It does not require high-low-high transitions - a single edge suffices. If WDI remains static longer than 209s, RESET asserts for 150ms. The timer pauses while RESET is asserted and resumes counting immediately upon deassertion, enabling precise firmware health monitoring.
What is the supply current of the MAX6865UK30D3L+T across its operating voltage range?
The MAX6865UK30D3L+T draws 170nA typical supply current at VCC = 2.5V and TA = +25°C, rising to 190nA at 3.3V and 210nA at 5.0V. At VCC = 1.8V, ICC is 170nA (typ). All values are specified over -40°C to +85°C, with maximum ICC ≤ 400nA at 5.0V - confirming true nanopower performance essential for decade-long battery operation.
Can the MAX6865UK30D3L+T interface directly to a 5V microcontroller reset input?
Yes, the MAX6865UK30D3L+T's active-high push-pull RESET output is referenced to VCC and guarantees VOH ≥ 0.8×VCC at ISOURCE = 500µA. When powered from a 3.0V rail, RESET reaches ≥2.4V - sufficient to drive standard 5V-tolerant µP reset inputs (e.g., STM32, PIC, MSP430) without level shifters. For strict 5V logic thresholds, verify µP's VIH min against actual VCC and load conditions.
MAX6865UK30D3L+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:
- 3V
- 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
MAX6865UK30D3L+T FAQ
1.How can I place an order for MAX6865UK30D3L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK30D3L+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 MAX6865UK30D3L+T reliable?
The price and inventory of MAX6865UK30D3L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK30D3L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK30D3L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK30D3L+T transactions.
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4.How is shipping managed for MAX6865UK30D3L+T?
MAX6865UK30D3L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK30D3L+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 MAX6865UK30D3L+T?
For technical support, including MAX6865UK30D3L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK30D3L+T requirements.
6.How does Aetrix verify that MAX6865UK30D3L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK30D3L+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 MAX6865UK30D3L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK30D3L+T?
All MAX6865UK30D3L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK30D3L+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 MAX6865UK30D3L+T part is unused and in its original packaging.
Return procedure for MAX6865UK30D3L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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