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Analog Devices Inc./Maxim Integrated MAX6860UK19D2+
- Part No.:
- MAX6860UK19D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6860UK19D2+.pdf
- Description:
- MAX6860 NANOPOWER MICROPROCESSOR
- Quantity:
- Payment:
- Shipping:
Inventory:622
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Product details
Overview
MAX6860UK19D2+ from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and watchdog timer functionality. It asserts an active-low push-pull RESET output when VCC drops below 1.900V (±2.5%), MR is pulled low, or the watchdog times out after 3.3s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset down to VCC = +1.1V.
For engineers reviewing the MAX6860UK19D2+ datasheet, MAX6860UK19D2+ pinout, MAX6860UK19D2+ application, or MAX6860UK19D2+ equivalent, this page delivers verified functional identity, exact reset threshold and timeout values, confirmed watchdog behavior, and validated alternative options for battery-powered medical and portable electronics design.
Technical Context
The MAX6860UK19D2+ belongs to the MAX6864–MAX6869 series with integrated watchdog timer and manual reset input. Its watchdog monitors WDI activity with a typical timeout of 3.3s (S-suffix), clearing on any rising/falling edge and disabling during RESET assertion. The device uses factory-trimmed reset threshold (1.900V) and fixed 40ms minimum reset timeout (D2 option).
It features push-pull active-low RESET output referenced to VCC, internal 10kΩ MR pullup, and immunity to VCC transients ≤40µs at 100mV overdrive. Guaranteed operation from -40°C to +85°C and valid reset down to VCC = 1.1V enable robust brownout protection in low-voltage embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 1.900V ±2.5% - sets precise brownout detection point for 1.8V/2.5V logic domains |
| Reset Timeout Period | 40ms (min) - ensures µP completes power-up initialization before release |
| Watchdog Timeout | 3.3s (typ) - provides fail-safe recovery for firmware hangs without excessive latency |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in glucose monitors and wearables |
| Operating Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail systems |
| RESET Output Type | Push-pull active-low - eliminates external pullup, drives directly into CMOS reset inputs |
| VCC Validity Limit | Guaranteed RESET validity down to VCC = +1.1V - ensures reliable reset assertion during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks current when asserted, drives high when deasserted |
| 2 | GND | Ground reference for all internal circuits and reset timing; must connect 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; resets internal timer on any edge; requires ≥150ns pulse width for detection |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 170nA supply current | Enables >10-year battery life in always-on patient monitors powered by CR2032 cells |
| Factory-trimmed 1.900V reset threshold | Eliminates external resistor networks and calibration overhead for 1.8V I/O domain supervision |
| 40ms fixed reset timeout (D2) | Matches typical ARM Cortex-M0+ boot ROM initialization time without software configuration |
| 3.3s watchdog timeout (S-suffix) | Provides sufficient margin for BLE stack connection handshakes while catching infinite loops |
| Immunity to 40µs VCC transients | Rejects switching noise from DC-DC converters without false resets in compact PCB layouts |
| Valid RESET down to VCC = 1.1V | Ensures deterministic reset assertion during Li-ion discharge down to 2.5V pack voltage |
Applications
| Portable Medical Devices | Wearable Health Monitors |
|---|---|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 14 days on single coin cell. IC Role / Device Role / Timing Role: Supervises 1.8V MCU supply and detects firmware lockups via WDI toggling during sensor read cycles. Use Value: 170nA quiescent current extends battery life beyond 200 hours per charge; 3.3s watchdog prevents missed insulin alerts. |
Use Scenario: Optical heart-rate sensor wristband operating from rechargeable Li-Poly battery. IC Role / Device Role / Timing Role: Monitors 2.5V analog front-end supply and asserts RESET if BLE radio fails to service WDI within 3.3s. Use Value: 1.900V threshold precisely tracks LDO dropout; push-pull RESET eliminates pullup resistor area on space-constrained flex PCB. |
| Industrial Handheld Terminals | Low-Power IoT Sensors |
Use Scenario: Rugged barcode scanner powered by AA alkaline cells in warehouse environments. IC Role / Device Role / Timing Role: Provides brownout reset during battery swap and manual reset via button connected to MR pin. Use Value: 40ms reset timeout ensures full FPGA configuration before application launch; MR internal pullup removes BOM component. |
Use Scenario: Soil moisture node deployed outdoors, harvesting energy from solar cell + supercapacitor. IC Role / Device Role / Timing Role: Supervises variable 1.5–3.0V harvested rail and triggers watchdog reset if environmental sensor firmware stalls. Use Value: Valid RESET down to 1.1V allows operation across full supercap discharge curve; 1.900V threshold aligns with optimal ADC reference stability point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK19D2S+ | Identical reset threshold (1.900V), timeout (40ms), and watchdog (3.3s); differs only in part numbering convention (UK19D2S+ vs UK19D2+) | No functional difference; both support same MR/WDI/RESET pinout and SOT23-5 package | Select MAX6864UK19D2S+ if standard ordering codes require explicit 'S' suffix for watchdog-enable variants |
| TPS3836K33DBVR | Fixed 3.3V reset threshold, no watchdog timer, 200ms reset timeout, open-drain RESET output | Lacks WDI functionality and adjustable timeout; requires external pullup; suited for simpler power-on reset only | Choose TPS3836K33DBVR only when watchdog capability is unnecessary and 3.3V rail supervision suffices |
Compared with MAX6860UK19D2+, MAX6864UK19D2S+ offers identical electrical behavior and pin compatibility, while TPS3836K33DBVR trades watchdog safety and low-threshold flexibility for cost reduction in non-critical reset-only applications.
Availability
MAX6860UK19D2+ is available at Aetrix Electronics and suitable for portable medical devices, wearable health monitors, industrial handheld terminals, and low-power IoT sensors requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX6860UK19D2+ 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 connectivity in demanding industrial and medical applications.
The MAX6860UK19D2+ belongs to the nanopower µP supervisory family engineered specifically for battery-critical systems where sub-µA quiescent current, accurate low-voltage reset thresholds, and integrated watchdog safety are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6860UK19D2+?
The MAX6860UK19D2+ has a factory-trimmed reset threshold voltage of 1.900V 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 '19' corresponds to 1.900V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, making it suitable for deep-brownout protection in 1.8V systems.
Does the MAX6860UK19D2+ include a watchdog timer, and what is its timeout?
Yes, the MAX6860UK19D2+ includes a watchdog timer with a typical timeout of 3.3s, indicated by the 'S' suffix embedded in its ordering code (the 'S' is implied in MAX6860UK19D2+ per Selector Guide and Ordering Information). The timer clears on any rising or falling edge at WDI and expires only if WDI remains static longer than 3.3s (typ), triggering a full reset timeout period.
What is the reset timeout period for the MAX6860UK19D2+?
The MAX6860UK19D2+ has a fixed minimum reset timeout period of 40ms, denoted by the 'D2' suffix in its part number. Per Table 4 (Reset Timeout Periods), D2 specifies 40ms (min), 60ms (typ), and 80ms (max). This timeout begins after VCC rises above 1.900V and MR is deasserted, ensuring the microprocessor completes power-up initialization before release.
What type of RESET output does the MAX6860UK19D2+ provide?
The MAX6860UK19D2+ provides a push-pull active-low RESET output (Pin 1), as confirmed by its position in the Selector Guide under "PUSH-PULL ACTIVE LOW" and Pin Description tables. This output drives low actively during reset and high actively when deasserted-no external pullup resistor is required, simplifying layout and reducing BOM count.
How is the manual reset input (MR) configured on the MAX6860UK19D2+?
The MR pin (Pin 3) of the MAX6860UK19D2+ is an active-low input with an internal 10kΩ pullup to VCC. It accepts standard CMOS logic levels, requires a minimum pulse width of 1µs, and features 200ns glitch rejection. When unused, MR may be left floating or tied to VCC; for pushbutton implementation, connect a normally open switch from MR to GND-no external debounce components are needed.
MAX6860UK19D2+ 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:
- 1.9V
- Output:
- Open Drain or Open Collector
- 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
MAX6860UK19D2+ FAQ
1.How can I place an order for MAX6860UK19D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6860UK19D2+ 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 MAX6860UK19D2+ reliable?
The price and inventory of MAX6860UK19D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6860UK19D2+ is usually 5 days.
3.What payment methods are accepted for MAX6860UK19D2+?
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MAX6860UK19D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6860UK19D2+ 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 MAX6860UK19D2+?
For technical support, including MAX6860UK19D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6860UK19D2+ requirements.
6.How does Aetrix verify that MAX6860UK19D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6860UK19D2+ 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 MAX6860UK19D2+ meets industry standards.
7.What is the process for return or replacement of MAX6860UK19D2+?
All MAX6860UK19D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6860UK19D2+, 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 MAX6860UK19D2+ part is unused and in its original packaging.
Return procedure for MAX6860UK19D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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