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Analog Devices Inc./Maxim Integrated MAX6860UK45D3+T
- Part No.:
- MAX6860UK45D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6860UK45D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,151
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Product details
Overview
MAX6860UK45D3+T 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 when VCC drops below 4.500V (typ), MR is pulled low, or watchdog timeout occurs (3.3s typ), with guaranteed reset validity down to VCC = +1.1V. Designed for battery-powered medical and portable electronics requiring ultra-low quiescent current.
For engineers reviewing the MAX6860UK45D3+T datasheet, MAX6860UK45D3+T pinout, MAX6860UK45D3+T application, or MAX6860UK45D3+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options - all specific to the MAX6860UK45D3+T variant with 4.5V threshold, D3 (150ms min) reset timeout, and S (3.3s typ) watchdog period.
Technical Context
The MAX6860UK45D3+T integrates a precision voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C, a 150ms minimum reset timeout timer, and a 3.3s typical watchdog timeout (S-suffix) that clears on any WDI edge. Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset without external components.
This device belongs to the MAX6864–MAX6869 watchdog-enabled subgroup and uses BiCMOS process for 170nA typical supply current at VCC = 1.8V. Unlike non-watchdog variants, it requires WDI activity monitoring and asserts RESET on VCC undervoltage, MR assertion, or watchdog expiration - all with identical 150ms reset hold time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.500V (typ), ±2.5% tolerance - ensures reliable brownout detection for 4.5V nominal rails |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year operation in coin-cell-powered devices |
| Reset Timeout Period | 150ms (min), 225ms (typ), 300ms (max) - holds µP in reset long enough for full power stabilization |
| Watchdog Timeout | 3.3s (typ), S-suffix - provides sufficient margin for firmware execution loops without false triggers |
| RESET Output Type | Active-low push-pull - drives directly into µP reset pin without external pullup resistor |
| VCC Validity Range | Guaranteed RESET assertion down to VCC = +1.1V - supports deep brownout recovery before power collapse |
| MR Input Behavior | Internally pulled up to VCC via 10kΩ; 1µs minimum pulse width - compatible with mechanical switches and CMOS logic |
Pinout & Package
MAX6860UK45D3+T is housed in a lead-free 5-pin SOT23-5 package (JEDEC MO-178AA), with pins arranged as follows (top view): Pin 1 = I.C., Pin 2 = GND, Pin 3 = MR, Pin 4 = RESET, Pin 5 = VCC. The I.C. pin is internally connected and must be tied to GND for optimal noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (I.C.) | Internally Connected | Must be externally connected to GND to reduce noise susceptibility; no signal function |
| 2 (GND) | Ground Reference | Primary return path for all internal circuits; must connect to system ground plane |
| 3 (MR) | Manual Reset Input | Active-low input; initiates reset when pulled ≤0.3×VCC; internally pulled up to VCC (10kΩ) |
| 4 (RESET) | Reset Output | Active-low push-pull output; sinks ≥500µA at VCC ≥2.38V; no external pullup required |
| 5 (VCC) | Supply Voltage Input | Monitored rail input; bypass with 0.1µF capacitor to GND; valid from 1.2V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical at 1.8V - extends battery life in glucose monitors and wearables beyond 5 years |
| Watchdog timer with edge-triggered clear | Clears on any rising/falling edge at WDI - prevents stuck-loop masking of firmware faults |
| Immunity to short VCC transients | No reset triggered by ≤40µs transients at 100mV overdrive - rejects switching noise in DC/DC converters |
| Guaranteed reset assertion down to 1.1V | Valid RESET output even during deep brownout - ensures µP remains held until complete power collapse |
| No external components required | Integrated MR pullup, precision voltage reference, and timing capacitors - reduces BOM count and PCB area |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose levels with Bluetooth LE transmission. IC Role / Device Role / Timing Role: Supervises 3.3V main rail and triggers hard reset if firmware hangs during sensor initialization or radio handshake. Use Value: 170nA quiescent current extends CR2032 battery life to >24 months; 3.3s watchdog timeout matches max sensor acquisition + BLE packet cycle. |
Use Scenario: Wearable patch recording ECG, SpO₂, and temperature continuously for 72 hours. IC Role / Device Role / Timing Role: Monitors 1.8V analog front-end supply and asserts RESET if VCC sags during RF burst transmission. Use Value: Guaranteed RESET assertion down to 1.1V prevents partial ADC conversion corruption; 150ms reset hold ensures full SoC reinitialization. |
| Low-Power Smart Pagers | Industrial Wireless Sensor Nodes |
Use Scenario: Two-way pager receiving encrypted alerts via sub-GHz ISM band with wake-on-RX capability. IC Role / Device Role / Timing Role: Provides manual reset via tactile button (MR) and watchdog supervision of baseband processor during sleep/wake transitions. Use Value: MR internal 10kΩ pullup eliminates external resistor; 200ns glitch rejection prevents false resets from RF coupling into MR trace. |
Use Scenario: Dust-proof enclosure housing LoRaWAN node sampling environmental sensors every 15 minutes. IC Role / Device Role / Timing Role: Supervises 3.6V Li-SOCl₂ primary cell and triggers reset if MCU fails to service watchdog during deep sleep exit. Use Value: 4.5V reset threshold aligns with end-of-life voltage of Li-SOCl₂; 170nA ICC minimizes self-discharge impact over 10-year deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK45D3S+T | Same 4.5V threshold, D3 timeout, S-watchdog; adds WDI pin (Pin 1), removes I.C. pin | Requires WDI routing; supports active firmware watchdog feeding instead of passive timeout | Select when µP can toggle WDI - enables tighter fault detection than passive timeout alone |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms reset timeout, no watchdog, SOT23-5 pin-compatible | Lacks watchdog and adjustable threshold; only suitable for fixed 3.3V systems without code-execution monitoring | Choose only if replacing legacy TPS3836 designs and watchdog functionality is unnecessary |
Compared with MAX6860UK45D3+T, MAX6864UK45D3S+T adds active watchdog control at the cost of extra PCB routing, while TPS3836K33DBVR offers drop-in compatibility for 3.3V-only systems but omits both programmable threshold and watchdog - making MAX6860UK45D3+T the sole option for 4.5V rails requiring autonomous timeout-based supervision.
Availability
MAX6860UK45D3+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered telemetry modules, and low-power industrial sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6860UK45D3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX6860UK45D3+T belongs to the MAX6864–MAX6869 watchdog supervisory family, engineered specifically for ultra-low-power embedded systems where firmware reliability must be enforced autonomously during battery depletion or electromagnetic interference events.
FAQ
What is the exact reset threshold voltage of the MAX6860UK45D3+T?
The MAX6860UK45D3+T has a factory-trimmed reset threshold of +4.500V (typical), 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 "45" corresponds to 4.500V. The device asserts RESET when VCC falls below this threshold and holds it for the full D3 timeout period (150ms min) after VCC recovers.
Does the MAX6860UK45D3+T require an external pullup resistor on the RESET pin?
No, the MAX6860UK45D3+T features an active-low push-pull RESET output, which actively drives low and high without needing an external pullup. This is explicitly stated in the Pin Description section for MAX6860: "Push-pull RESET outputs are referenced to VCC." The 0.1µF bypass capacitor on VCC is required, but no pullup is needed on RESET - simplifying layout and reducing BOM count.
How does the watchdog timer in the MAX6860UK45D3+T operate, and what is its timeout period?
The MAX6860UK45D3+T watchdog timer expires after 3.3 seconds (typical), denoted by the "S" suffix in its part number. It monitors the WDI pin and resets the system if WDI remains static (high or low) beyond this period. The timer clears on any rising or falling edge at WDI, ensuring responsiveness to firmware activity - critical for detecting hung code in safety-critical portable devices.
What is the function of the I.C. pin on the MAX6860UK45D3+T, and how should it be connected?
The I.C. (Internally Connected) pin on the MAX6860UK45D3+T is not a signal pin - it connects internally to substrate or guard structures. Per the Pin Configurations diagram and datasheet note, it must be externally tied to GND to improve noise immunity in electrically noisy environments. Leaving it floating may degrade transient rejection performance, especially in battery-powered medical equipment.
Is the MAX6860UK45D3+T compatible with 1.8V microcontrollers, and what is its minimum operating voltage?
Yes, the MAX6860UK45D3+T operates from VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1.1V. At 1.8V supply, its typical supply current is 170nA, and its RESET output can sink ≥500µA (VOL ≤ 0.3V). This makes it fully compatible with 1.8V µPs used in modern ultra-low-power wearables and sensors.
MAX6860UK45D3+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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6860UK45D3+T FAQ
1.How can I place an order for MAX6860UK45D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6860UK45D3+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 MAX6860UK45D3+T reliable?
The price and inventory of MAX6860UK45D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6860UK45D3+T is usually 5 days.
3.What payment methods are accepted for MAX6860UK45D3+T?
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4.How is shipping managed for MAX6860UK45D3+T?
MAX6860UK45D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6860UK45D3+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 MAX6860UK45D3+T?
For technical support, including MAX6860UK45D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6860UK45D3+T requirements.
6.How does Aetrix verify that MAX6860UK45D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6860UK45D3+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 MAX6860UK45D3+T meets industry standards.
7.What is the process for return or replacement of MAX6860UK45D3+T?
All MAX6860UK45D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6860UK45D3+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 MAX6860UK45D3+T part is unused and in its original packaging.
Return procedure for MAX6860UK45D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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