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Analog Devices Inc./Maxim Integrated MAX6861UK225+T
- Part No.:
- MAX6861UK225+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6861UK225+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,339
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Product details
Overview
MAX6861UK225+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.235V reset threshold (±2.5%), and pin-selectable 10ms/150ms minimum reset timeout. It monitors VCC, accepts manual reset via MR input, and asserts active-low push-pull RESET to ensure reliable power-up/brownout recovery in battery-powered medical and portable electronics.
For engineers reviewing the MAX6861UK225+T datasheet, MAX6861UK225+T pinout, MAX6861UK225+T application, or MAX6861UK225+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed timing behavior across temperature, and real-world substitution guidance for low-power µP reset design.
Technical Context
The MAX6861UK225+T implements a precision bandgap-based voltage monitor with guaranteed reset validity down to VCC = +1.1V and immunity to VCC transients ≤40µs at 100mV overdrive. Its internal timer enforces a minimum reset pulse width after VCC recovery or MR deassertion.
Pin-selectable CT input configures the reset timeout between two fixed options: D1 (10ms min) or D3 (150ms min), with no external components required. MR features 10kΩ internal pullup and 250ns propagation delay, supporting direct CMOS-level or open-drain manual reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C; enables multi-year operation on coin-cell batteries without compromising reset reliability. |
| Reset Threshold | 2.235V ±2.5%; factory-trimmed for accurate brownout detection at 2.2V systems (e.g., Li-ion single-cell). |
| Reset Timeout Options | 10ms or 150ms min (CT-pin selectable); ensures sufficient µP initialization time without excessive system hold-off. |
| VCC Validity Range | Reset asserted valid down to VCC = +1.1V; guarantees deterministic reset state during deep brownout. |
| MR Input Logic | Active-low with 0.3×VCC max VIL; compatible with standard CMOS outputs and debounced switch interfaces. |
| RESET Output Type | Push-pull active-low; eliminates need for external pullup and supports direct drive of µP reset inputs. |
| Operating Temp | -40°C to +85°C; qualified for industrial and portable medical equipment environments. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact 2.9mm × 1.6mm footprint with 0.95mm height, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CT | Reset timeout select input: logic low → 10ms min timeout (D1), logic high → 150ms min timeout (D3). |
| 2 | GND | Ground reference for all internal circuitry; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); initiates reset when driven ≤0.3×VCC. |
| 4 | RESET | Push-pull active-low reset output; sinks ≥50µA at VCC ≥1.1V; drives µP reset pin directly without external components. |
| 5 | VCC | Supply voltage input (1.2V–5.5V); monitored for reset assertion; requires 0.1µF bypass capacitor to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors and wearable sensors. |
| Pin-selectable tRP | Dual timeout options (10ms/150ms) allow one BOM item to serve both fast-boot and safety-critical applications. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive, preventing spurious resets in noisy automotive or industrial environments. |
| No external components | Self-contained supervision: no capacitors, resistors, or trimming required for basic reset functionality. |
| Guaranteed reset at low VCC | RESET remains valid down to VCC = +1.1V, ensuring deterministic behavior during deep brownout recovery. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervises 2.2V Li-ion supply and triggers hard reset on brownout to prevent corrupted sensor calibration data. Use Value: 170nA ICC extends disposable sensor cartridge life beyond 14 days; 10ms timeout enables rapid wake-from-sleep recovery. |
Use Scenario: Portable ECG patch with ARM Cortex-M0+ MCU, analog front-end, and rechargeable battery. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and asserts reset if voltage sags below 2.235V during RF transmission bursts. Use Value: Pin-selectable 150ms timeout ensures ADC and op-amp circuits fully stabilize before firmware execution resumes. |
| MP3 Players | Smart Pagers |
Use Scenario: Flash-based audio player using single-cell Li-ion (2.8–4.2V range) with aggressive power gating. IC Role / Device Role / Timing Role: Provides VCC monitoring and manual reset via physical button; CT pin set to 10ms for responsive UI recovery. Use Value: Push-pull RESET eliminates pullup resistor, reducing BOM count and PCB area in ultra-thin form factors. |
Use Scenario: Two-way pager with persistent memory and real-time clock, operating from CR2032 coin cell. IC Role / Device Role / Timing Role: Detects end-of-life battery drop below 2.235V and forces controlled shutdown/reset sequence. Use Value: Valid reset assertion down to VCC = +1.1V prevents undefined MCU states during final battery discharge phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | Fixed 3.08V reset threshold; 200ms fixed timeout; 1.6µA ICC (10× higher than MAX6861UK225+T). | Suitable for 3.3V systems only; not viable for 2.2V brownout detection or ultra-low-power coin-cell use. | Select when 3.3V rail supervision dominates and 170nA ICC is not required. |
| STM6315SW33DX | 3.08V threshold; 140ms timeout; 2.5µA ICC; no CT pin select; operates down to -40°C but unqualified above +70°C. | Limited temperature range excludes industrial medical devices; higher ICC reduces battery lifetime by factor of 15. | Choose only for cost-sensitive consumer electronics with 3.3V rails and < +70°C ambient. |
Compared with TPS3836K33DBVR and STM6315SW33DX, the MAX6861UK225+T uniquely delivers 2.235V threshold accuracy, 170nA ICC, and pin-selectable timeout in a single 5-pin SOT23 - enabling compact, long-life, and precise brownout protection where voltage margin is tight and power budget is constrained.
Availability
MAX6861UK225+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, MP3 players, and smart pagers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6861UK225+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 industrial, medical, and portable markets.
The MAX6861UK225+T belongs to the nanopower µP supervisory family engineered specifically for battery-critical applications where sub-µA quiescent current, accurate low-voltage thresholds, and minimal external components are mandatory.
FAQ
What is the exact reset threshold voltage of MAX6861UK225+T?
The MAX6861UK225+T has a factory-trimmed reset threshold of 2.235V with ±2.5% tolerance over temperature (-40°C to +85°C). This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "225" corresponds to nominal 2.235V. The MAX6861UK225+T maintains this accuracy without external calibration or trimming components.
How does the CT pin configure reset timeout on MAX6861UK225+T?
On the MAX6861UK225+T, the CT pin selects between two minimum reset timeout periods: logic low (≤0.2×VCC) configures D1 (10ms min), and logic high (≥0.8×VCC) configures D3 (150ms min). This selection is latched at reset assertion and remains effective until the next reset cycle. The MAX6861UK225+T datasheet specifies typical values of 15ms and 225ms respectively.
Does MAX6861UK225+T include a watchdog timer function?
No, the MAX6861UK225+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, only MAX6864–MAX6869 variants feature WDI input and watchdog timeout circuitry. The MAX6861UK225+T provides voltage monitoring, manual reset (MR), and pin-selectable reset timeout - but no watchdog capability.
What is the maximum VCC voltage the MAX6861UK225+T can monitor?
The MAX6861UK225+T supports VCC supply voltages from 1.2V to 5.5V, with full electrical specifications guaranteed across that range. Its reset threshold remains accurate and its 170nA supply current holds true up to 5.5V. The absolute maximum rating for VCC is +6.0V, but operation above 5.5V is not characterized or recommended.
Is MAX6861UK225+T pin-compatible with other supervisory ICs?
Yes, the MAX6861UK225+T is pin-compatible with the TPS3836/TPS3837/TPS3838 family per the datasheet Features section. All share identical 5-pin SOT23 pinout (CT/MR/GND/RESET/VCC), enabling drop-in replacement in existing layouts - provided the reset threshold, timeout, and output polarity requirements align with the target application.
MAX6861UK225+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.235V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6861UK225+T FAQ
1.How can I place an order for MAX6861UK225+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6861UK225+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 MAX6861UK225+T reliable?
The price and inventory of MAX6861UK225+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6861UK225+T is usually 5 days.
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MAX6861UK225+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6861UK225+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 MAX6861UK225+T?
For technical support, including MAX6861UK225+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6861UK225+T requirements.
6.How does Aetrix verify that MAX6861UK225+T is sourced from the original manufacturer or authorized distributors?
All MAX6861UK225+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 MAX6861UK225+T meets industry standards.
7.What is the process for return or replacement of MAX6861UK225+T?
All MAX6861UK225+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6861UK225+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 MAX6861UK225+T part is unused and in its original packaging.
Return procedure for MAX6861UK225+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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