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Analog Devices Inc./Maxim Integrated MAX6865UK23D5S+T
- Part No.:
- MAX6865UK23D5S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK23D5S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,362
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Product details
Overview
MAX6865UK23D5S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, combining voltage monitoring (2.23V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (209s typical timeout). It asserts an active-high push-pull RESET output during VCC brownout, MR assertion, or watchdog expiration, with guaranteed reset validity down to VCC = +1.1V. Used in battery-powered medical monitors and portable instrumentation requiring ultra-low quiescent current.
For engineers reviewing the MAX6865UK23D5S+T datasheet, MAX6865UK23D5S+T pinout, MAX6865UK23D5S+T application, or MAX6865UK23D5S+T equivalent, key selection criteria include its 170nA typical supply current, 209s watchdog timeout, 300ms minimum reset timeout (D5), 2.23V reset threshold, and compatibility with noisy low-voltage systems operating down to 1.2V.
Technical Context
The MAX6865UK23D5S+T implements a dual-trigger reset architecture: one path responds to VCC falling below 2.23V ±2.5%, another to MR low assertion, and a third to WDI inactivity exceeding 209s (typ). Its internal watchdog timer clears on any WDI edge, MR assertion, or RESET assertion - ensuring robust recovery from software hangs.
Reset timing is governed by a fixed 300ms minimum timeout (D5 option) after VCC rises above threshold or MR deasserts. The device guarantees valid RESET output down to VCC = +1.1V and exhibits immunity to VCC transients ≤40µs at 100mV overdrive, critical for unstable power rails in portable equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year battery life in always-on medical sensors. |
| Reset Threshold | 2.23V ±2.5% - precisely matches 2.2V/2.3V system rails without external resistor networks. |
| Reset Timeout | 300ms minimum (D5) - ensures full µP initialization before release in low-power microcontrollers. |
| Watchdog Timeout | 209s typical (L suffix) - supports long idle cycles in intermittent-sampling devices like glucose meters. |
| VCC Operating Range | 1.2V to 5.5V - operates across single-cell Li-ion (3.0–4.2V), coin-cell (1.5–3.0V), and regulated 1.8V/2.5V rails. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup and simplifies interface to µP reset inputs. |
| Reset Validity | Guaranteed to VCC = +1.1V - maintains deterministic reset state during deep brownout conditions. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), 2.9mm × 1.6mm footprint, 1.1mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin directly; sinks/source up to 1.2mA at VCC ≥2.38V. |
| 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 209s (typ); detects edges ≥150ns; resets internal timer on rising/falling transition. |
| 5 | VCC | Supply and monitored voltage input - bypass with 0.1µF ceramic capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical enables >10-year battery operation in coin-cell-powered patient monitors. |
| Factory-trimmed reset threshold | 2.23V ±2.5% eliminates calibration overhead and reduces BOM count in production. |
| Watchdog timer with long timeout | 209s typical (L) supports firmware with extended sleep modes without false triggers. |
| Brownout immunity | Valid RESET assertion down to VCC = +1.1V prevents undefined µP behavior during deep discharge. |
| No external components required | Integrated MR pullup, precise voltage reference, and timing circuitry reduce PCB area and assembly cost. |
Applications
| Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous glucose sensing with intermittent wireless transmission and 5-year coin-cell battery life. IC Role / Device Role / Timing Role: Supervisory IC monitors 1.8V sensor rail and asserts RESET if voltage sags or firmware hangs; WDI confirms periodic sensor readout. Use Value: 170nA ICC extends battery life; 209s watchdog timeout accommodates long transmission intervals without false resets. | Use Scenario: Portable ECG/SpO₂ logger recording data every 30 seconds and transmitting hourly via BLE. IC Role / Device Role / Timing Role: Resets microcontroller upon 2.23V rail collapse during battery depletion or initiates recovery after WDI stall. Use Value: Guaranteed RESET validity to 1.1V ensures deterministic restart even as battery discharges below nominal voltage. |
| Handheld Diagnostic Tools | Industrial Wireless Sensors |
Use Scenario: Battery-operated ultrasound probe with embedded ARM Cortex-M0+ and flash memory. IC Role / Device Role / Timing Role: Provides power-on reset, brownout protection, and software watchdog using single 5-pin SOT23 device. Use Value: 300ms D5 reset timeout allows full flash initialization and clock stabilization before µP execution begins. | Use Scenario: LoRaWAN node measuring temperature/humidity in remote locations with 10-year battery target. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and resets MCU if supply drops or firmware locks during sensor acquisition. Use Value: Immunity to ≤40µs VCC transients prevents spurious resets caused by RF switching noise on shared power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6865UK23D5L+T | Same pinout and electrical specs, but uses L-suffix watchdog (209s typ) instead of S-suffix (3.3s typ) - MAX6865UK23D5S+T has S-suffix. | Designed for longer watchdog intervals; unsuitable where fast fault detection (<5s) is required. | Select MAX6865UK23D5S+T when rapid response to software lockup is needed; choose L version only if extended timeout is acceptable. |
| TPS3837K23DBVR | Pin-compatible alternative with 2.23V threshold and 200ms reset timeout; higher 1.2µA ICC; no integrated watchdog timer. | Lacks watchdog functionality - requires external timing or µP-based supervision for hang detection. | Use only if watchdog capability is unnecessary and higher supply current is acceptable for cost or availability reasons. |
Compared with MAX6865UK23D5S+T, the MAX6865UK23D5L+T offers identical form/fit/function except for watchdog timeout length, while TPS3837K23DBVR provides threshold matching but omits watchdog - making MAX6865UK23D5S+T the sole choice for compact, low-power, self-contained supervision with fast fault response.
Availability
MAX6865UK23D5S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign loggers, handheld diagnostic tools, and industrial wireless sensors requiring stable component supply across long-lifecycle medical and industrial programs.
Supply support for MAX6865UK23D5S+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 MAX68xx family delivers nanopower supervisory solutions optimized for battery-critical portable medical devices and low-voltage embedded systems requiring reliable reset generation and software hang detection.
FAQ
What is the exact reset threshold voltage of MAX6865UK23D5S+T?
The MAX6865UK23D5S+T features a factory-trimmed reset threshold of 2.23V, with tolerance of ±2.5% over the -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "23" corresponds to 2.23V nominal. The device guarantees valid reset assertion down to VCC = +1.1V, supporting operation during deep brownout conditions.
Does MAX6865UK23D5S+T include a watchdog timer, and what is its timeout?
Yes, MAX6865UK23D5S+T includes an integrated watchdog timer with a typical timeout of 3.3s (S-suffix), as specified in Table 3 (Watchdog Timeout). The timer expires if the WDI input remains static (high or low) beyond this period, triggering a reset for the D5 timeout duration (300ms min). The timer clears on any WDI edge, MR assertion, or RESET assertion - ensuring responsive recovery from firmware stalls.
What is the reset timeout period configured for MAX6865UK23D5S+T?
The "D5" in MAX6865UK23D5S+T denotes a minimum reset timeout period of 300ms, with typical value 450ms and maximum 600ms (per Table 4). This fixed timeout begins after VCC rises above 2.23V or MR deasserts, and ensures sufficient time for microcontroller power stabilization and internal register initialization before release.
What type of RESET output does MAX6865UK23D5S+T provide?
MAX6865UK23D5S+T provides an active-high push-pull RESET output (pin 1), as confirmed in the MAX6865 pin description and Selector Guide. This eliminates the need for an external pullup resistor and allows direct connection to microcontroller reset inputs requiring high-active assertion. Output voltage meets VOH ≥0.8×VCC at ISOURCE = 500µA for VCC ≥2.38V.
Is MAX6865UK23D5S+T compatible with 1.8V supply systems?
Yes, MAX6865UK23D5S+T operates across VCC = 1.2V to 5.5V and is fully specified at 1.8V, where its typical supply current is 170nA. Its 2.23V reset threshold is appropriate for monitoring 2.3V or higher rails, but it can supervise lower supplies when used with external resistive dividers - though the datasheet confirms guaranteed reset validity down to VCC = +1.1V, making it suitable for marginal 1.8V operation with headroom.
MAX6865UK23D5S+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:
- 2.313V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 300ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK23D5S+T FAQ
1.How can I place an order for MAX6865UK23D5S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK23D5S+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 MAX6865UK23D5S+T reliable?
The price and inventory of MAX6865UK23D5S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK23D5S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK23D5S+T?
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4.How is shipping managed for MAX6865UK23D5S+T?
MAX6865UK23D5S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK23D5S+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 MAX6865UK23D5S+T?
For technical support, including MAX6865UK23D5S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK23D5S+T requirements.
6.How does Aetrix verify that MAX6865UK23D5S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK23D5S+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 MAX6865UK23D5S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK23D5S+T?
All MAX6865UK23D5S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK23D5S+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 MAX6865UK23D5S+T part is unused and in its original packaging.
Return procedure for MAX6865UK23D5S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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