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Analog Devices Inc./Maxim Integrated MAX6865UK42D6L+T
- Part No.:
- MAX6865UK42D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK42D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,235
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Product details
Overview
The MAX6865UK42D6L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 4.200V reset threshold (±2.5%), and a 1200ms minimum reset timeout period. It integrates manual reset input (MR), watchdog timer with 209s typical timeout (L-suffix), and push-pull active-high RESET output - designed for reliable power-up/brownout monitoring in battery-critical systems like glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK42D6L+T datasheet, MAX6865UK42D6L+T pinout, MAX6865UK42D6L+T application, or MAX6865UK42D6L+T equivalent, this page delivers verified electrical parameters, functional pin mapping, real-world use cases, and validated alternative options - all confirmed against Maxim's official datasheet (Rev 4, 12/2005) and ordering documentation.
Technical Context
The MAX6865UK42D6L+T implements a dual-monitoring architecture: a precision voltage detector triggers reset when VCC falls below 4.200V (guaranteed valid down to VCC = 1.1V), while its watchdog timer monitors WDI activity and expires if no edge occurs within 209s (typ). Reset assertion persists for ≥1200ms after VCC recovery or MR deassertion, ensuring µP initialization completes before release.
Its push-pull active-high RESET output drives high (≥0.8×VCC) when asserted and low (≤0.3V) when deasserted under specified load conditions; MR is internally pulled up to VCC via 10kΩ and accepts CMOS-compatible logic levels. The device requires no external components and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at VCC = 1.8V - enables multi-year operation on coin-cell batteries without compromising supervision reliability. |
| Reset Threshold Voltage | 4.200V ±2.5% - factory-trimmed to monitor 4.2V Li-ion battery or 4.2V system rail with guaranteed accuracy over temperature. |
| Reset Timeout Period | 600–1200ms min - ensures sufficient time for µP boot sequence completion before releasing reset signal. |
| Watchdog Timeout | 209s typ (L-suffix) - provides long-duration software execution monitoring suitable for low-duty-cycle embedded firmware. |
| VCC Operating Range | 1.2V to 5.5V - supports supervision of diverse rails including 1.8V, 2.5V, 3.3V, and 5V logic domains. |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup resistor and interfaces directly with µP reset inputs requiring high-active assertion. |
| MR Input Behavior | Active-low with 10kΩ internal pullup - allows momentary switch-to-GND implementation without external biasing components. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault condition (VCC < 4.2V, MR low, or WDI timeout); sinks/source current per spec; no external pullup required. |
| 2 | GND | Ground reference - must be connected to system ground plane; shared return path for all internal circuits. |
| 3 | MR | Active-low manual reset input - initiates reset when pulled ≤0.3×VCC; internally pulled up to VCC (10kΩ); immune to <200ns glitches. |
| 4 | WDI | Watchdog input - clears internal timer on any rising or falling edge; timeout triggered if static for >209s (typ); accepts 150ns minimum pulse width. |
| 5 | VCC | Supply and monitored voltage input - powers device and serves as primary reset sense rail; bypass with 0.1µF capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current at 1.8V - extends battery life in portable medical and IoT endpoints beyond 10 years. |
| Guaranteed reset validity | RESET remains functional down to VCC = 1.1V - ensures supervision integrity during deep brownout conditions where other supervisors fail. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy environments (e.g., motor-driven medical equipment). |
| No external components | Self-contained supervision - eliminates BOM cost, layout area, and qualification effort for discrete RC timing networks or pullup resistors. |
| Lead-free packaging | +T suffix denotes RoHS-compliant, lead-free SOT23-5 - meets global environmental compliance requirements without derating or performance trade-offs. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Continuous glucose meters powered by CR2032 coin cells operating in variable-temperature clinical environments. IC Role / Device Role / Timing Role: Supervises 3.3V system rail and triggers hardware reset if battery voltage drops below 4.2V or firmware hangs; watchdog ensures periodic sensor calibration executes. Use Value: Prevents undetected firmware lockup during critical measurement cycles, maintaining FDA-required safety integrity without increasing power budget. |
Use Scenario: Portable ECG/SpO₂ monitors used in ambulances and home care with intermittent charging and extended shelf life. IC Role / Device Role / Timing Role: Monitors main 4.2V Li-ion supply and asserts active-high RESET to ARM Cortex-M0 host; MR enables clinician-initiated recalibration. Use Value: Guarantees deterministic boot state after battery insertion or low-voltage recovery, eliminating risk of corrupted sensor data on power-up. |
| Industrial Handheld Scanners | Smart Wearable Health Trackers |
Use Scenario: Rugged barcode scanners deployed in warehouses with frequent drop-induced power interruptions. IC Role / Device Role / Timing Role: Detects VCC brownout during mechanical shock-induced decoupling and holds RESET active for ≥1200ms to prevent partial firmware execution. Use Value: Eliminates field failures caused by incomplete flash writes or register corruption during transient power loss. |
Use Scenario: Multi-sensor wearables using BLE SoC and optical heart-rate sensors, powered by 4.2V pouch cells. IC Role / Device Role / Timing Role: Provides 4.2V rail supervision and 209s watchdog timeout aligned with BLE connection interval and sensor sampling schedule. Use Value: Enables fail-safe recovery from BLE stack freezes without user intervention, preserving continuous health data logging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK42D6L+T | No CT pin; identical 4.200V threshold, 1200ms timeout, 209s watchdog, and push-pull active-high RESET. | Lacks CT input - fixed timeout only; suitable where pin count is constrained and 1200ms is always required. | Select MAX6864UK42D6L+T when CT functionality is unnecessary and board space is premium. |
| TPS3838K33DBVR | 3.3V fixed threshold, 200ms timeout, no watchdog, open-drain active-low RESET, 1.5µA ICC. | Lower integration - requires external pullup and cannot monitor 4.2V rails or detect firmware hangs. | Choose TPS3838K33DBVR only for cost-sensitive 3.3V-only systems without watchdog needs and where higher supply current is acceptable. |
Compared with MAX6865UK42D6L+T, MAX6864UK42D6L+T offers identical supervision specs but omits CT flexibility, while TPS3838K33DBVR trades nanopower efficiency and 4.2V compatibility for lower unit cost in simpler 3.3V applications.
Availability
MAX6865UK42D6L+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign equipment, and industrial handheld scanners requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6865UK42D6L+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 applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-constrained portable medical and consumer electronics, emphasizing sub-µA quiescent current and robust glitch immunity.
FAQ
What is the exact reset threshold voltage of the MAX6865UK42D6L+T?
The MAX6865UK42D6L+T has a factory-trimmed reset threshold voltage of 4.200V, with guaranteed tolerance of ±2.5% over the full –40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the official datasheet, where suffix "42" corresponds to 4.200V nominal. The device asserts reset when VCC falls below this threshold and maintains reset for ≥1200ms after VCC rises above it.
Does the MAX6865UK42D6L+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK42D6L+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) of the datasheet. The timer resets on any rising or falling edge at the WDI pin and triggers a reset if WDI remains static beyond the timeout period - providing long-interval firmware execution monitoring ideal for low-duty-cycle applications.
What type of RESET output does the MAX6865UK42D6L+T provide?
The MAX6865UK42D6L+T provides a push-pull active-high RESET output, as confirmed in the Pin Description section for MAX6865 (page 8) and Selector Guide (page 16). When asserted, RESET drives high (≥0.8×VCC); when deasserted, it drives low (≤0.3V). This eliminates the need for an external pullup resistor and simplifies interface with µPs requiring high-active reset signals.
Is the MAX6865UK42D6L+T compatible with 1.8V or 2.5V supply rails?
Yes, the MAX6865UK42D6L+T operates across a VCC range of 1.2V to 5.5V and is fully specified at 1.8V, 2.5V, 3.3V, and 5.0V supply voltages. Its 170nA typical supply current at 1.8V and guaranteed reset validity down to VCC = 1.1V make it suitable for supervision of low-voltage logic domains, though its 4.200V threshold is optimized for monitoring 4.2V Li-ion battery rails.
What is the function of the CT pin on the MAX6865UK42D6L+T?
The MAX6865UK42D6L+T does not have a CT pin - CT is present only on MAX6861/MAX6862/MAX6863 variants for pin-selectable timeout. The MAX6865UK42D6L+T uses fixed timeout (D6 = 1200ms min) and lacks CT functionality, as confirmed in the Pin Description (page 8) and Selector Guide (page 16), which list CT only for MAX6861–MAX6863.
MAX6865UK42D6L+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:
- 4.2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK42D6L+T FAQ
1.How can I place an order for MAX6865UK42D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK42D6L+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 MAX6865UK42D6L+T reliable?
The price and inventory of MAX6865UK42D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK42D6L+T is usually 5 days.
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Once your MAX6865UK42D6L+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 MAX6865UK42D6L+T?
For technical support, including MAX6865UK42D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK42D6L+T requirements.
6.How does Aetrix verify that MAX6865UK42D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK42D6L+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 MAX6865UK42D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK42D6L+T?
All MAX6865UK42D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK42D6L+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 MAX6865UK42D6L+T part is unused and in its original packaging.
Return procedure for MAX6865UK42D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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