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Analog Devices Inc./Maxim Integrated MAX6865UK33D4L+T
- Part No.:
- MAX6865UK33D4L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK33D4L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,506
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Product details
Overview
MAX6865UK33D4L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.3V reset threshold (±2.5%), 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 µP initialization during brownout or software lockup.
For engineers reviewing the MAX6865UK33D4L+T datasheet, MAX6865UK33D4L+T pinout, MAX6865UK33D4L+T application, or MAX6865UK33D4L+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), push-pull active-high RESET output, and integrated 10kΩ MR pullup - critical for low-power, noise-sensitive embedded systems.
Technical Context
The MAX6865UK33D4L+T implements a dual-monitoring architecture: a precision voltage detector triggers reset when VCC falls below 3.3V ±2.5%, while a watchdog timer expires if WDI remains static beyond 209s (typ). Reset assertion persists for ≥1200ms after VCC recovery or MR deassertion, ensuring µP stabilization.
Its BiCMOS process enables nanoscale leakage control (170nA ICC typ at 2.5V), and the internal 10kΩ MR pullup eliminates external components. The device asserts RESET high (push-pull) upon fault detection and maintains valid logic levels down to VCC = 1.1V, supporting deep brownout operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at 2.5V - enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold | 3.3V ±2.5% - factory-trimmed for precise 3.3V rail monitoring without external calibration. |
| Reset Timeout | 1200ms minimum - ensures full µP boot sequence completion before release. |
| Watchdog Timeout | 209s typical - provides long-duration software execution supervision for infrequent tasks. |
| VCC Validity Range | 1.1V to 5.5V - guarantees RESET output integrity even during severe brownout conditions. |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset implementation with momentary switch to GND. |
| WDI Pulse Detection | 150ns minimum pulse width - reliably captures fast µP state transitions for robust watchdog clearing. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-high) | Push-pull output asserted high during reset; sinks no current when deasserted; referenced to VCC. |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels. |
| 4 | WDI | Watchdog input; rising or falling edge clears internal timer; static condition >209s triggers reset. |
| 5 | VCC | Primary supply input monitored for brownout; bypass with 0.1µF capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery life in single-CR2032 medical devices. |
| Guaranteed reset validity to 1.1V | Ensures deterministic µP reset behavior even as battery voltage collapses below 1.2V. |
| No external components required | Integrated 10kΩ MR pullup and precision voltage reference eliminate BOM cost and layout area. |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive - prevents spurious resets in noisy power environments. |
| Watchdog timer with 209s timeout | Matches long-cycle firmware operations (e.g., sensor polling, data logging) without false triggering. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to initialize MCU on power-up and watchdog-triggered recovery from firmware hang. Use Value: 170nA quiescent current extends CR2032 battery life beyond 2 years; 1.1V VCC validity ensures reset integrity during end-of-battery discharge. |
Use Scenario: Portable ECG/SpO₂ units operating from rechargeable Li-ion with intermittent wireless reporting. IC Role / Device Role / Timing Role: Voltage monitor and watchdog supervisor ensuring safe MCU restart after brownout or software crash during clinical data acquisition. Use Value: 1200ms reset timeout accommodates full bootloader and firmware validation; 209s watchdog period aligns with maximum allowable sensor sampling interval. |
| Smart Wearables | Industrial Handheld Terminals |
Use Scenario: Fitness trackers with motion-sensing, heart-rate monitoring, and multi-day battery runtime. IC Role / Device Role / Timing Role: Nanopower supervisory circuit providing VCC monitoring and software supervision for ARM Cortex-M0+ host MCU. Use Value: Factory-trimmed 3.3V threshold matches common PMIC output rails; SOT23-5 footprint minimizes PCB area in space-constrained wrist-worn designs. |
Use Scenario: Ruggedized barcode scanners used in warehouse logistics with frequent drop-induced firmware faults. IC Role / Device Role / Timing Role: Fault-detection IC triggering hardware reset on power anomaly or unresponsive application layer. Use Value: MR input enables field-service reset via dedicated button; 209s watchdog timeout exceeds longest possible scan-and-process cycle without compromising reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK33D4S+T | Same 3.3V threshold and 1200ms timeout, but 3.3s watchdog (vs. 209s); push-pull active-low RESET. | Better suited for fast-recovery systems requiring sub-5s watchdog response (e.g., real-time motor controllers). | Select MAX6864UK33D4S+T only if shorter watchdog timeout and active-low reset polarity are required. |
| TPS3836K33DBVR | 3.3V threshold, 200ms timeout, no watchdog; SOT23-5; 1.6µA supply current (vs. 170nA). | Lacks watchdog functionality and offers 6× higher ICC - unsuitable for multi-year battery applications. | Choose TPS3836K33DBVR only for cost-sensitive, non-battery-critical designs where watchdog is unnecessary. |
Compared with MAX6865UK33D4L+T, MAX6864UK33D4S+T trades longer watchdog supervision for faster fault response and inverted reset polarity, while TPS3836K33DBVR sacrifices nanoscale power efficiency and watchdog capability for lower unit cost in AC-powered systems.
Availability
MAX6865UK33D4L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart wearables, and industrial handheld terminals requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK33D4L+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 interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family delivers nanopower supervisory functions - voltage monitoring, manual reset, and watchdog timing - specifically for battery-constrained portable and medical electronics demanding multi-year operation.
FAQ
What is the reset output configuration of the MAX6865UK33D4L+T?
The MAX6865UK33D4L+T features a push-pull active-high RESET output. When asserted, RESET goes high (to VCC level); when deasserted, it goes low (near 0V). This eliminates need for external pullup resistors and ensures clean logic-level compatibility with µP reset inputs expecting active-high signals. The output remains valid down to VCC = +1.1V.
Does the MAX6865UK33D4L+T require external components for basic operation?
No, the MAX6865UK33D4L+T operates autonomously with zero external components. Its MR input includes a built-in 10kΩ pullup to VCC, the voltage reference is factory-trimmed, and no timing capacitors or resistors are needed. Only a 0.1µF bypass capacitor on VCC is recommended for noise immunity - not strictly required but strongly advised for robust operation.
What is the exact watchdog timeout specification for MAX6865UK33D4L+T?
The MAX6865UK33D4L+T has a watchdog timeout of 95s (min), 209s (typ), and 487s (max) - denoted by the "L" suffix in its part number. This long timeout is optimized for firmware with infrequent state changes, such as periodic sensor reads or wireless transmissions, preventing false resets during legitimate long idle periods.
How does the MAX6865UK33D4L+T handle VCC transients?
The MAX6865UK33D4L+T rejects short VCC transients: a 100mV overdrive glitch lasting ≤40µs typically does not trigger reset. This immunity is achieved through internal filtering and is validated across temperature (-40°C to +85°C). It prevents spurious resets in electrically noisy environments like motor-driven handheld tools or switching power supply proximity.
Can the MAX6865UK33D4L+T monitor supply voltages other than 3.3V?
No - the "33" in MAX6865UK33D4L+T specifies a factory-trimmed 3.3V reset threshold (3.22V min, 3.38V max per ±2.5% tolerance). It is not adjustable. For other thresholds (e.g., 1.8V, 2.5V, 5.0V), select alternate variants like MAX6865UK18D4L+T or MAX6865UK25D4L+T, which share identical functionality and package.
MAX6865UK33D4L+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:
- 3.3V
- 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
MAX6865UK33D4L+T FAQ
1.How can I place an order for MAX6865UK33D4L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK33D4L+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 MAX6865UK33D4L+T reliable?
The price and inventory of MAX6865UK33D4L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK33D4L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK33D4L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK33D4L+T transactions.
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4.How is shipping managed for MAX6865UK33D4L+T?
MAX6865UK33D4L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK33D4L+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 MAX6865UK33D4L+T?
For technical support, including MAX6865UK33D4L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK33D4L+T requirements.
6.How does Aetrix verify that MAX6865UK33D4L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK33D4L+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 MAX6865UK33D4L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK33D4L+T?
All MAX6865UK33D4L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK33D4L+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 MAX6865UK33D4L+T part is unused and in its original packaging.
Return procedure for MAX6865UK33D4L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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