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Analog Devices Inc./Maxim Integrated MAX6861UK26+T
- Part No.:
- MAX6861UK26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6861UK26+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
MAX6861UK26+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.625V reset threshold (suffix '26'), and pin-selectable 10ms/150ms minimum reset timeout via CT input. It monitors VCC, asserts active-low push-pull RESET on brownout or manual reset, and guarantees valid reset down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6861UK26+T datasheet, MAX6861UK26+T pinout, MAX6861UK26+T application, or MAX6861UK26+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing parameters, real-world use context, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX6861UK26+T integrates voltage monitoring, manual reset input (MR), and pin-configurable reset timeout logic - but no watchdog timer (excluded per Selector Guide). Its CT pin selects between D1 (10ms min) and D3 (150ms min) reset timeout periods, with internal 10kΩ MR pullup and guaranteed reset assertion at VCC ≥ 1.1V.
It uses BiCMOS process (2848 transistors), operates from -40°C to +85°C, and features immunity to short VCC transients (e.g., ≤40µs for 100mV overdrive). The push-pull active-low RESET output drives directly without external components and remains asserted for the full timeout after VCC rises above 2.625V or MR deasserts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V (factory-trimmed, ±2.5% tolerance) - ensures reliable power-on reset for 2.7V–3.3V systems |
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout Options | 10ms or 150ms min (pin-selectable via CT) - supports fast recovery or robust brownout hold-off |
| VCC Operating Range | 1.2V to 5.5V - compatible with Li-ion, alkaline, and regulated low-voltage rails |
| RESET Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout |
| MR Input Logic | Active-low, internally pulled up to VCC (10kΩ), 1µs minimum pulse width - accepts CMOS or open-drain signals |
| Package | 5-pin SOT23 - surface-mount footprint compatible with high-density portable PCB layouts |
Pinout & Package
5-pin SOT23 package with exposed pad (not electrically connected); compact 2.9mm × 1.6mm footprint, 1.1mm height.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CT | Reset timeout select input: low = 10ms min, high = 150ms min; CMOS-compatible, 20nA leakage |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); initiates reset when driven ≤0.3×VCC |
| 4 | RESET | Active-low push-pull reset output; sinks 50µA at VCC ≥1.1V, VOH ≥0.8×VCC when deasserted |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in always-on medical sensors |
| Pin-selectable timeout | CT pin eliminates need for external RC timing components or firmware configuration |
| Brownout immunity | Valid RESET assertion down to VCC = +1.1V prevents erratic µP behavior during deep undervoltage |
| No external components | Integrated MR pullup, precision voltage reference, and timing logic reduce BOM count and layout area |
| VCC transient rejection | Immune to ≤40µs VCC glitches at 100mV overdrive - avoids false resets in noisy power environments |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing in wearable patch pumps requiring multi-year battery operation and fail-safe power-up sequencing. IC Role / Device Role / Timing Role: Supervises main µP supply rail (2.8V), asserts RESET on power-up and brownout, and provides 150ms timeout for ADC initialization. Use Value: 170nA ICC extends CR2032 battery life beyond 3 years; 10kΩ MR pullup enables momentary switch interface without external resistors. |
Use Scenario: Portable ECG/SpO₂ units powered by single-cell Li-ion, subject to rapid load transients and thermal cycling. IC Role / Device Role / Timing Role: Monitors 3.3V system rail, triggers hardware reset on VCC dip below 2.625V, and holds RESET for 150ms to ensure stable µP boot. Use Value: Guaranteed RESET validity to 1.1V prevents latch-up during battery sag; SOT23 footprint fits tight space constraints near sensor front-end. |
| MP3 Players | PDAs / Handheld Terminals |
Use Scenario: Flash-based audio players using 1.8V core and 3.3V I/O, where cold-start reliability and low quiescent current are critical. IC Role / Device Role / Timing Role: Provides 2.625V reset threshold aligned with 2.7V LDO output, with 10ms timeout for fast wake-from-sleep recovery. Use Value: Pin-selectable timeout allows same BOM for fast-boot (CT=low) and robust-hold (CT=high) variants; no external timing caps required. |
Use Scenario: Industrial handheld terminals operating in wide temperature ranges (-40°C to +85°C) with intermittent GPS/WiFi bursts. IC Role / Device Role / Timing Role: Supervises 3.3V system rail, detects brownout during RF transmit surges, and asserts RESET with 150ms hold time for full µP reinitialization. Use Value: Immunity to 40µs VCC transients prevents false resets during RF switching; BiCMOS process ensures stable operation across full temp range. |
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 2.625V threshold, 200nA ICC, but fixed 200ms timeout (no CT pin); push-pull active-low RESET | Lacks pin-selectable timeout - requires separate SKUs for different delay needs | Choose if fixed 200ms timeout suffices and TI sourcing is preferred |
| MAX6361L26R23+ | 2.63V threshold, 1.2µA ICC (7× higher), 140ms fixed timeout, SOT23-5, same temp range | Higher supply current reduces battery life; no CT flexibility; lower accuracy (±3% vs ±2.5%) | Consider only if MAX6861UK26+T lead-time constraints exist and 1.2µA ICC is acceptable |
Compared with TPS3836K26DBVR and MAX6361L26R23+, the MAX6861UK26+T uniquely combines ultra-low 170nA current, factory-trimmed 2.625V threshold, and field-selectable 10ms/150ms timeout - enabling single-BOM support for multiple power-up timing requirements in space-constrained medical and portable designs.
Availability
MAX6861UK26+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitoring devices, and MP3 players requiring stable component supply with long-term lifecycle assurance and lead-free compliance.
Supply support for MAX6861UK26+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, mixed-signal, and power management ICs for demanding industrial, medical, and portable applications.
The MAX6861UK26+T belongs to the MAX6854–MAX6869 nanopower µP supervisory family, engineered specifically for ultra-low-power battery-operated systems requiring guaranteed reset integrity across wide temperature and voltage ranges.
FAQ
What is the exact reset threshold voltage of MAX6861UK26+T?
The MAX6861UK26+T has a factory-trimmed reset threshold of 2.625V, 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 '26' corresponds to 2.625V nominal. The device guarantees reset assertion when VCC falls below this threshold and holds RESET for the selected timeout period after VCC recovers.
Does MAX6861UK26+T include a watchdog timer function?
No, the MAX6861UK26+T does not include a watchdog timer. Per the Selector Guide and Pin Description sections, MAX6861/MAX6862/MAX6863 feature CT input and MR but omit WDI - unlike MAX6864–MAX6869 which explicitly include watchdog functionality. The MAX6861UK26+T provides only voltage monitoring, manual reset, and pin-selectable reset timeout.
How is the reset timeout period selected on MAX6861UK26+T?
The reset timeout period on MAX6861UK26+T is selected via the CT pin: connect CT to GND for 10ms minimum timeout (D1 option), or to VCC for 150ms minimum timeout (D3 option). This selection is effective immediately and can be changed dynamically, though the new timeout applies only after the current reset cycle completes - as specified in Table 1 and Applications Information section.
What is the supply current of MAX6861UK26+T at 2.5V and +25°C?
The MAX6861UK26+T draws 170nA typical supply current at VCC = 2.5V and TA = +25°C, with a maximum of 370nA. This ultra-low ICC is measured with reset deasserted and no load, and is confirmed in the Electrical Characteristics table under "Supply Current (ICC)" with condition "VCC > VTH, no load, reset output deasserted".
Is MAX6861UK26+T pin-compatible with any Texas Instruments supervisory ICs?
Yes, the MAX6861UK26+T is pin-compatible with the TPS3836/TPS3837/TPS3838 series, as explicitly stated in the Features section: "Pin Compatible to the TPS3836/TPS3837/TPS3838 (MAX6861/MAX6862/MAX6863)". This compatibility covers identical 5-pin SOT23 pinout (CT/MR/GND/RESET/VCC), enabling drop-in replacement in existing designs where timing and threshold match.
MAX6861UK26+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:
- 2.625V
- 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+T FAQ
1.How can I place an order for MAX6861UK26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6861UK26+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 MAX6861UK26+T reliable?
The price and inventory of MAX6861UK26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6861UK26+T is usually 5 days.
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4.How is shipping managed for MAX6861UK26+T?
MAX6861UK26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6861UK26+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 MAX6861UK26+T?
For technical support, including MAX6861UK26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6861UK26+T requirements.
6.How does Aetrix verify that MAX6861UK26+T is sourced from the original manufacturer or authorized distributors?
All MAX6861UK26+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 MAX6861UK26+T meets industry standards.
7.What is the process for return or replacement of MAX6861UK26+T?
All MAX6861UK26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6861UK26+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 MAX6861UK26+T part is unused and in its original packaging.
Return procedure for MAX6861UK26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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