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Analog Devices Inc./Maxim Integrated MAX6861UK26
- Part No.:
- MAX6861UK26
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6861UK26.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,169
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Product details
Overview
MAX6861UK26 from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.625V reset threshold (suffix '26'), and pin-selectable 10ms/150ms minimum reset timeout via CT input. It monitors VCC, responds to manual reset (MR), and asserts active-low push-pull RESET - used in battery-powered medical and portable electronics for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6861UK26 datasheet, MAX6861UK26 pinout, MAX6861UK26 application, or MAX6861UK26 equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed timing behavior under VCC transients, and real-world selection guidance for low-power µP reset supervision in space-constrained designs.
Technical Context
The MAX6861UK26 integrates voltage monitoring, manual reset detection, and a fixed-function reset timeout generator - with no watchdog timer (unlike MAX6864–MAX6869). Its CT pin selects between two factory-set timeout options (D1 = 10ms min or D3 = 150ms min), enabling design flexibility without external components.
It guarantees valid RESET assertion down to VCC = +1.1V and exhibits immunity to VCC transients ≤40µs at 100mV overdrive. The internal 10kΩ MR pullup and glitch rejection (200ns) support direct switch interfacing without external debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries in always-on monitoring systems. |
| Reset Threshold Voltage | 2.625V ±2.5% - precisely trimmed to supervise 2.5V or 2.7V logic rails with margin against brownout. |
| Reset Timeout Options | 10ms or 150ms (min) - selected by CT pin logic level; ensures sufficient µP initialization time across diverse clock speeds. |
| VCC Validity Range | Operates down to VCC = +1.1V - maintains guaranteed RESET assertion during deep brownout, preventing undefined µP state. |
| MR Input Behavior | Active-low with 10kΩ internal pullup and 1µs minimum pulse width - supports momentary switches and CMOS logic without external biasing. |
| Output Type | Push-pull active-low RESET - eliminates need for external pullup resistor and provides rail-to-rail drive into µP reset pin. |
| Package | 5-pin SOT23 - footprint-compatible with industry-standard supervisory ICs for drop-in layout reuse. |
Pinout & Package
MAX6861UK26 uses a 5-pin SOT23 package (JEDEC MO-178AA), with pins arranged as follows (top view): Pin 1 = CT, Pin 2 = GND, Pin 3 = MR, Pin 4 = RESET, Pin 5 = VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CT | Reset timeout select input | Logic-low selects 10ms min timeout (D1); logic-high selects 150ms min timeout (D3); no external pull required. |
| 2 - GND | Ground reference | Common return path for all internal circuits; must connect to system ground plane for noise immunity. |
| 3 - MR | Manual reset input | Active-low; internally pulled up to VCC (10kΩ); accepts CMOS levels; initiates reset when driven ≤0.3×VCC. |
| 4 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; sinks ≥50µA at VCC ≥1.1V; VOH ≥0.8×VCC when deasserted. |
| 5 - VCC | Supply voltage input | Monitored rail input; bypass with 0.1µF ceramic capacitor to GND; operates from 1.2V to 5.5V. |
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 timeout | CT pin eliminates need for external RC timing network - reduces BOM count and PCB area vs. adjustable supervisors. |
| VCC transient immunity | Immune to ≤40µs VCC glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| Guaranteed reset validity | RESET remains asserted and valid down to VCC = +1.1V - ensures deterministic µP startup even during severe brownout. |
| No external components | Internal MR pullup, precision voltage reference, and timeout generator eliminate capacitors, resistors, and trimming. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and low-power MCU sleep/wake cycles. IC Role / Device Role / Timing Role: Supervises 2.5V analog front-end and 3.3V wireless SoC supply rails; asserts RESET on power-up and brownout to prevent corrupted sensor calibration data. Use Value: 170nA ICC extends CR2032 battery life beyond 2 years; 10ms timeout ensures fast wake-from-sleep recovery without firmware delay loops. |
Use Scenario: Portable ECG and SpO₂ units powered by rechargeable Li-ion cells with dynamic load switching. IC Role / Device Role / Timing Role: Monitors main 3.3V system rail and auxiliary 1.8V ADC supply; triggers hardware reset if either rail dips below 2.625V during high-current pulse delivery. Use Value: 2.625V threshold matches nominal 2.5V rail tolerance; CT pin allows field-programmable timeout to match different MCU boot sequences. |
| Smart Wearables | Industrial Handheld Terminals |
|
Use Scenario: Fitness trackers with motion sensor fusion, OLED display, and BLE connectivity operating on single-cell LiPo. IC Role / Device Role / Timing Role: Provides power-on reset and brownout protection for ARM Cortex-M0+ MCU; MR pin enables user-initiated soft reset via tactile button. Use Value: Push-pull RESET drives MCU reset pin directly - avoids leakage issues of open-drain alternatives in high-impedance sleep modes. |
Use Scenario: Ruggedized barcode scanners with cold-temperature operation (-20°C) and frequent battery swaps. IC Role / Device Role / Timing Role: Supervises 3.3V logic rail during hot-swap battery insertion; detects VCC ramp-up and holds RESET until stable, then releases after 150ms (CT = high). Use Value: Guaranteed operation down to VCC = +1.1V prevents false release during marginal battery voltage; SOT23 footprint fits tight mechanical envelopes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K26DBVR | Same 2.63V threshold, 200ms fixed timeout, 1.8µA ICC - 10× higher quiescent current than MAX6861UK26. | Not suitable for multi-year coin-cell applications; better for systems with regulated 3.3V supply and less stringent power budgets. | Select TPS3836K26DBVR only if board-level compatibility with TI's SOT23-5 footprint and existing TI ecosystem tools is required. |
| STM6315SW26D6F | 2.63V threshold, 1.6µA ICC, 200ms timeout - lacks MR input and CT select; open-drain output requires pullup. | Cannot support manual reset or timeout adjustment; limited to basic power-on reset in cost-sensitive consumer devices. | Choose STM6315SW26D6F where MR functionality is unnecessary and lowest unit cost outweighs power/performance trade-offs. |
Compared with TPS3836K26DBVR and STM6315SW26D6F, MAX6861UK26 uniquely combines nanopower operation (170nA), pin-selectable timeout, and integrated MR - making it the only option for long-life, feature-rich reset supervision in compact portable medical and industrial devices.
Availability
MAX6861UK26 is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, smart wearables, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX6861UK26 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, medical, and communications systems.
The MAX6861UK26 belongs to the MAX6854–MAX6869 nanopower µP supervisory family - engineered specifically for ultra-low-power, space-constrained applications where battery longevity and deterministic reset behavior are critical.
FAQ
What is the exact reset threshold voltage of MAX6861UK26?
The MAX6861UK26 has a factory-trimmed reset threshold voltage of 2.625V, 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 '26' corresponds to VTH = 2.625V. The device asserts RESET when VCC falls below this threshold and holds it for the selected timeout period after VCC rises above it.
Does MAX6861UK26 include a watchdog timer function?
No, MAX6861UK26 does not include a watchdog timer. It is part of the MAX6861–MAX6863 subgroup, which features manual reset (MR) and pin-selectable reset timeout (via CT), but no WDI input or watchdog circuitry. Watchdog capability is exclusive to MAX6864–MAX6869 variants - confirmed in the Selector Guide and Pin Descriptions sections of the datasheet.
How do I configure the reset timeout period on MAX6861UK26?
On MAX6861UK26, the reset timeout is configured using the CT pin (Pin 1): connect CT to GND for 10ms minimum timeout (D1), or to VCC for 150ms minimum timeout (D3). This selection is latched at power-up and remains active until the next power cycle. The actual timeout varies with temperature and supply voltage, but minimum values are guaranteed per Table 1 and Table 4.
What is the supply current of MAX6861UK26 at 1.8V and –40°C?
At VCC = 1.8V and TA = –40°C, the MAX6861UK26 supply current is guaranteed ≤370nA (maximum), with typical value of 170nA at +25°C. The datasheet Electrical Characteristics table shows ICC = 170nA (typ) at VCC = 1.8V, TA = +25°C, and notes that ICC increases slightly at temperature extremes - remaining well below 1µA across full operating range.
Is MAX6861UK26 pin-compatible with TPS3836 series devices?
Yes, MAX6861UK26 is pin-compatible with TPS3836/TPS3837/TPS3838 devices per the datasheet Feature list: "Pin Compatible to the TPS3836/TPS3837/TPS3838 (MAX6861/MAX6862/MAX6863)". Both use identical 5-pin SOT23 pinout (CT/GND/MR/RESET/VCC), enabling direct replacement in existing layouts - though functional differences (e.g., CT select vs. fixed timeout) require firmware or schematic review.
MAX6861UK26 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- 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
MAX6861UK26 FAQ
1.How can I place an order for MAX6861UK26 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6861UK26 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 MAX6861UK26 reliable?
The price and inventory of MAX6861UK26 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6861UK26 is usually 5 days.
3.What payment methods are accepted for MAX6861UK26?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6861UK26 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6861UK26?
MAX6861UK26 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6861UK26 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 MAX6861UK26?
For technical support, including MAX6861UK26 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6861UK26 requirements.
6.How does Aetrix verify that MAX6861UK26 is sourced from the original manufacturer or authorized distributors?
All MAX6861UK26 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 MAX6861UK26 meets industry standards.
7.What is the process for return or replacement of MAX6861UK26?
All MAX6861UK26 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6861UK26, 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 MAX6861UK26 part is unused and in its original packaging.
Return procedure for MAX6861UK26:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6861UK26 Tags
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MIC826SYMT-TR
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