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Analog Devices Inc./Maxim Integrated MAX6865UK22D2L+T
- Part No.:
- MAX6865UK22D2L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK22D2L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,424
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Product details
Overview
The MAX6865UK22D2L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (reset threshold = +2.235V), manual reset input (MR), and watchdog timer (209s typical timeout) with ultra-low 170nA typical supply current. It asserts an active-high push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, and holds reset for 40ms minimum after recovery - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK22D2L+T datasheet, MAX6865UK22D2L+T pinout, MAX6865UK22D2L+T application, or MAX6865UK22D2L+T equivalent, key selection criteria include its guaranteed RESET validity down to VCC = +1.1V, immunity to short VCC transients (<40µs at 100mV overdrive), fixed 40ms reset timeout, and compatibility with noisy low-power systems requiring reliable power-on reset and software fault detection.
Technical Context
This device implements a precision bandgap-based voltage monitor with ±2.5% reset threshold accuracy over -40°C to +85°C, coupled with a digital watchdog timer that clears on any WDI edge (rising or falling) and expires if WDI remains static beyond 209s (typ). The internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset without external components.
The push-pull active-high RESET output delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V) and VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V), ensuring clean logic-level signaling to µP reset inputs. No external capacitor or resistor is required for basic operation, supporting minimalist PCB design in space-constrained portable equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +2.235V (factory-trimmed, ±2.5% tolerance) - ensures precise brownout detection for 2.5V/3.3V rail monitoring |
| Supply Current | 170nA typical at +25°C - enables multi-year battery life in always-on medical sensors |
| Reset Timeout | 40ms minimum (D2 option) - provides sufficient hold time for µP initialization sequences |
| Watchdog Timeout | 209s typical (L suffix) - supports long-loop firmware without excessive watchdog toggling |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup and guarantees defined logic level at all VCC ≥ 1.1V |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies switch interface and reduces BOM count |
Pinout & Package
Package: 5-pin SOT23-5 (lead-free, +T suffix), footprint-compatible with industry-standard 5-lead SOT packages. Thermal pad not present; standard reflow profile applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; no external pullup needed |
| 2 | GND | Ground reference - must connect to system ground plane for noise immunity and accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; momentary switch to GND initiates reset |
| 4 | WDI | Watchdog input - rising/falling edges clear timer; static high/low >209s triggers reset |
| 5 | VCC | Supply voltage input - monitored for brownout; bypass with 0.1µF ceramic capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in coin-cell–powered devices |
| Guaranteed RESET validity | RESET remains functional down to VCC = +1.1V - ensures reset assertion even during deep brownout |
| Transient immunity | Immune to VCC glitches <40µs duration at 100mV overdrive - prevents false resets in noisy environments |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog timer eliminate discrete support parts |
| Lead-free packaging | +T suffix denotes RoHS-compliant, lead-free SOT23-5 - meets global environmental compliance requirements |
Applications
| Glucose Monitor Power Management | Patient Monitor Brownout Protection |
|---|---|
Use Scenario: Continuous glucose sensing with intermittent wireless transmission powered by CR2032 coin cell. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during battery voltage sag below 2.235V and detecting firmware lockup via WDI. Use Value: Prevents corrupted sensor readings or failed BLE handshakes by guaranteeing µP restart before critical data loss occurs. |
Use Scenario: Portable ECG device operating from rechargeable Li-ion with variable load profiles. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcing safe boot sequence and runtime integrity checks. Use Value: Eliminates risk of silent firmware failure during clinical measurement by forcing hard reset on missed WDI toggles. |
| MP3 Player Firmware Recovery | Industrial Handheld Scanner Reset Control |
Use Scenario: Flash-based audio player with deep-sleep mode drawing <1µA between playback sessions. IC Role / Device Role / Timing Role: Nanopower supervisor providing power-on reset and long-interval watchdog supervision (209s). Use Value: Enables reliable wake-from-sleep without external RC timing networks or additional reset ICs. |
Use Scenario: Rugged barcode scanner using ARM Cortex-M0 with frequent I/O interrupts and motor drive pulses. IC Role / Device Role / Timing Role: Reset generator with MR input for user-initiated reboot and WDI monitoring of main loop execution. Use Value: Ensures deterministic recovery from ESD-induced code crashes without requiring host MCU intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK22D2L+T | Same 2.235V threshold, 40ms timeout, 209s watchdog, but active-low push-pull RESET output | Requires µP with active-low reset input; incompatible with active-high reset designs without level-shifting | Select when interfacing with legacy µPs expecting active-low reset assertion |
| TPS3837K22DBVR | 2.2V threshold, 200ms min timeout, no watchdog, 1.6µA ICC - higher quiescent current, no WDI functionality | Suitable only for basic voltage monitoring; cannot replace watchdog-dependent safety-critical functions | Choose only for cost-sensitive, non-safety applications where watchdog is unnecessary |
Compared with MAX6864UK22D2L+T and TPS3837K22DBVR, the MAX6865UK22D2L+T uniquely combines ultra-low 170nA current, active-high RESET, and certified 209s watchdog in one SOT23 package - making it the sole fit for battery-powered medical devices requiring both low-power operation and fail-safe runtime supervision.
Availability
MAX6865UK22D2L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power industrial handhelds requiring stable component supply across extended product lifecycles.
Supply support for MAX6865UK22D2L+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 management, sensing, and interface applications in demanding industrial and medical environments.
The MAX6854–MAX6869 family was engineered specifically for nanopower supervisory functions in battery-critical systems - delivering factory-trimmed voltage thresholds, integrated watchdog timers, and guaranteed operation down to 1.1V VCC.
FAQ
What is the exact reset threshold voltage of the MAX6865UK22D2L+T?
The MAX6865UK22D2L+T has a factory-trimmed reset threshold of +2.235V, 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 "22" corresponds to 2.235V nominal. The MAX6865UK22D2L+T maintains this accuracy without external calibration.
Does the MAX6865UK22D2L+T require external components for basic operation?
No, the MAX6865UK22D2L+T operates autonomously with no external components required. Its internal 10kΩ MR pullup, precision voltage reference, and digital watchdog timer eliminate the need for external resistors, capacitors, or timing networks - though a 0.1µF bypass capacitor on VCC is recommended for noise immunity in real-world layouts.
What is the function of the WDI pin on the MAX6865UK22D2L+T?
The WDI (Watchdog Input) pin on the MAX6865UK22D2L+T monitors µP activity: any rising or falling edge clears the internal watchdog timer, while static high or low states exceeding 209s (typical) trigger a reset pulse. This ensures firmware liveliness - if the host µP hangs or misses a WDI toggle, the MAX6865UK22D2L+T forces a controlled restart.
How does the MAX6865UK22D2L+T behave when VCC drops below 1.1V?
The MAX6865UK22D2L+T guarantees valid RESET output down to VCC = +1.1V. Below this, RESET may become undefined due to insufficient drive strength. However, most µPs cease operation below 1.1V, so this limit aligns with system-level power collapse - no external pulldown is needed for the MAX6865UK22D2L+T's active-high push-pull output.
Is the MAX6865UK22D2L+T pin-compatible with other devices in the MAX68xx family?
Yes, the MAX6865UK22D2L+T shares the identical 5-pin SOT23-5 pinout with all MAX6864–MAX6869 variants. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC - enabling drop-in replacement within the same functional subgroup (watchdog-enabled, active-high RESET variants).
MAX6865UK22D2L+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:
- 2.188V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK22D2L+T FAQ
1.How can I place an order for MAX6865UK22D2L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK22D2L+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 MAX6865UK22D2L+T reliable?
The price and inventory of MAX6865UK22D2L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK22D2L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK22D2L+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6865UK22D2L+T transactions.
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4.How is shipping managed for MAX6865UK22D2L+T?
MAX6865UK22D2L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK22D2L+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 MAX6865UK22D2L+T?
For technical support, including MAX6865UK22D2L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK22D2L+T requirements.
6.How does Aetrix verify that MAX6865UK22D2L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK22D2L+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 MAX6865UK22D2L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK22D2L+T?
All MAX6865UK22D2L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK22D2L+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 MAX6865UK22D2L+T part is unused and in its original packaging.
Return procedure for MAX6865UK22D2L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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