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Analog Devices Inc./Maxim Integrated MAX6865UK45D1S+T
- Part No.:
- MAX6865UK45D1S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK45D1S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,503
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Product details
Overview
The MAX6865UK45D1S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, combining voltage monitoring (4.500V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (3.3s typical timeout). It asserts an active-low push-pull RESET output when VCC drops below threshold, MR is pulled low, or watchdog expires - ensuring reliable power-up/brownout recovery in ultra-low-power systems.
For engineers reviewing the MAX6865UK45D1S+T datasheet, MAX6865UK45D1S+T pinout, MAX6865UK45D1S+T application, or MAX6865UK45D1S+T equivalent, this device is selected for battery-powered medical monitors, portable instrumentation, and embedded systems requiring guaranteed reset validity down to VCC = +1.1V, <170nA supply current, and immunity to short VCC transients.
Technical Context
The MAX6865UK45D1S+T implements a dual-trigger reset architecture: one path responds to VCC falling below 4.500V ±2.5%, the second activates on MR assertion or WDI inactivity exceeding 3.3s (typ). Its internal watchdog timer clears on any WDI edge, MR assertion, or RESET assertion - preventing false timeouts during software initialization or interrupt handling.
Reset deassertion follows a fixed 10ms minimum timeout after VCC rises above threshold and MR deasserts; the push-pull RESET output drives low with ≤0.3V VOL at 1.2mA sink, and remains valid across -40°C to +85°C with guaranteed operation down to VCC = +1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.500V ±2.5% - precisely trimmed to monitor 4.5V rails without external resistors |
| Supply Current (typ) | 170nA at VCC = 1.8V - enables multi-year battery life in glucose monitors and wearables |
| Reset Timeout Period | 10ms min - ensures µP reset pulse meets minimum assertion time for ARM Cortex-M and similar cores |
| Watchdog Timeout | 3.3s typ (S-suffix) - balances fault detection speed against software execution time in firmware loops |
| RESET Output Type | Push-pull active-low - eliminates need for external pullup, simplifies interface to 1.8V–5.5V µP reset inputs |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V system rails without level-shifting |
| Guaranteed Reset Validity | Down to VCC = +1.1V - maintains deterministic reset state during deep brownout conditions |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount. Compact footprint (2.9mm × 1.6mm) suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - sinks up to 1.2mA; asserts low during VCC undervoltage, MR low, or watchdog timeout |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity and accurate threshold sensing |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic levels; 1µs minimum pulse width |
| 4 | WDI | Watchdog input - toggling required every <3.3s; detects edges ≥150ns; timer resets on rising/falling edge |
| 5 | VCC | Supply and monitored voltage input - bypass with 0.1µF capacitor to GND; reset asserted if VCC < 4.500V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - reduces quiescent drain in always-on patient monitors and IoT sensors |
| Factory-trimmed VTH | 4.500V ±2.5% - eliminates calibration overhead and external resistor networks for 4.5V rail supervision |
| No external components | Self-contained supervision - requires only 0.1µF VCC bypass capacitor; no timing resistors or capacitors needed |
| Glitch immunity | Immune to VCC transients ≤40µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| Wide VCC range | Operates from 1.2V to 5.5V - supports legacy 5V, modern 3.3V/1.8V, and single-cell battery systems |
Applications
| Portable Medical Devices | Battery-Powered Instrumentation |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 10+ days on coin-cell battery. IC Role / Device Role / Timing Role: Supervises 3.3V system rail and triggers hard reset if firmware hangs or power sags during sensor calibration. Use Value: 170nA ICC extends battery life; 4.500V threshold ensures clean reset before brownout-induced memory corruption. |
Use Scenario: Handheld multimeter powered by two AA alkaline cells (1.8V–3.2V range). IC Role / Device Role / Timing Role: Monitors declining battery voltage and asserts reset before ADC reference instability causes measurement errors. Use Value: Guaranteed reset validity to VCC = +1.1V prevents erratic behavior during final battery discharge phase. |
| Wearable Health Trackers | Low-Power Industrial Sensors |
|
Use Scenario: ECG patch transmitting data via BLE; MCU enters deep sleep between measurements. IC Role / Device Role / Timing Role: Watchdog (3.3s timeout) verifies firmware wakes correctly; MR allows user-initiated recalibration. Use Value: WDI edge-triggered watchdog avoids false timeouts during extended sleep cycles; MR internal 10kΩ pullup eliminates external component. |
Use Scenario: Wireless temperature node in HVAC duct, operating unattended for years on primary lithium battery. IC Role / Device Role / Timing Role: Supervises 3.6V LiSOCl₂ supply and forces MCU reboot if communication stack locks up. Use Value: 10ms reset timeout satisfies ARM reset timing requirements; SOT23-5 footprint minimizes PCB area in constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK45D1S+T | No CT pin; identical reset threshold (4.500V), timeout (10ms), and watchdog (3.3s) - differs only in absence of CT select function | Suitable where pin-selectable timeout is unnecessary; same footprint and electrical behavior otherwise | Select MAX6864UK45D1S+T if CT functionality is unused - identical cost and availability |
| TPS3836K33DBVR | Fixed 3.3V reset threshold; no watchdog; 200ms reset timeout; SOT23-5 package | Lacks watchdog and manual reset; intended for simpler 3.3V-only systems without firmware supervision needs | Choose only for basic 3.3V rail monitoring without code-execution safety - not a functional replacement for MAX6865UK45D1S+T |
Compared with MAX6864UK45D1S+T, the MAX6865UK45D1S+T adds no functional benefit unless CT-based timeout selection is required; compared with TPS3836K33DBVR, it delivers critical watchdog and 4.5V threshold capability essential for safety-critical firmware supervision.
Availability
MAX6865UK45D1S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and wearable health trackers requiring stable component supply with long-term lifecycle support.
Supply support for MAX6865UK45D1S+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 communications applications.
The MAX6854–MAX6869 family targets ultra-low-power microprocessor supervision in battery-critical systems, emphasizing nanopower operation, factory-trimmed accuracy, and integrated watchdog safety.
FAQ
What is the exact reset threshold voltage of the MAX6865UK45D1S+T?
The MAX6865UK45D1S+T has a factory-trimmed reset threshold voltage of 4.500V ±2.5%, as indicated by the "45" suffix in the part number per Maxim's Threshold Suffix Guide. This value is guaranteed over -40°C to +85°C and ensures precise supervision of 4.5V system rails without external calibration components.
Does the MAX6865UK45D1S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK45D1S+T includes a watchdog timer with a typical timeout of 3.3s, denoted by the "S" suffix in the part number. The timer resets on any rising or falling edge at the WDI pin and triggers a reset if no edge occurs within the timeout window - providing firmware execution integrity in embedded applications.
What is the reset timeout period for the MAX6865UK45D1S+T, and how is it set?
The MAX6865UK45D1S+T has a fixed 10ms minimum reset timeout period, specified by the "D1" suffix. Unlike MAX6861–MAX6863 variants, it does not feature a CT pin for timeout selection - the D1 option is permanently configured during manufacturing and requires no external configuration.
What type of RESET output does the MAX6865UK45D1S+T provide?
The MAX6865UK45D1S+T provides an active-low push-pull RESET output (Pin 1). It drives low with ≤0.3V at 1.2mA sink current and high to VCC when deasserted - eliminating the need for an external pullup resistor and enabling direct interface to standard µP reset inputs.
Is the MAX6865UK45D1S+T compatible with 1.8V microcontrollers?
Yes, the MAX6865UK45D1S+T operates from VCC = 1.2V to 5.5V and guarantees RESET validity down to VCC = +1.1V. Its push-pull RESET output is referenced to VCC, making it fully compatible with 1.8V µPs - provided the monitored VCC rail itself is 4.5V (as set by the 45 threshold suffix).
MAX6865UK45D1S+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:
- 4.5V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 10ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK45D1S+T FAQ
1.How can I place an order for MAX6865UK45D1S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK45D1S+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 MAX6865UK45D1S+T reliable?
The price and inventory of MAX6865UK45D1S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK45D1S+T is usually 5 days.
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Once your MAX6865UK45D1S+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 MAX6865UK45D1S+T?
For technical support, including MAX6865UK45D1S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK45D1S+T requirements.
6.How does Aetrix verify that MAX6865UK45D1S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK45D1S+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 MAX6865UK45D1S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK45D1S+T?
All MAX6865UK45D1S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK45D1S+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 MAX6865UK45D1S+T part is unused and in its original packaging.
Return procedure for MAX6865UK45D1S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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