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Analog Devices Inc./Maxim Integrated MAX6865UK23D6S+T
- Part No.:
- MAX6865UK23D6S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK23D6S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,881
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Product details
Overview
The MAX6865UK23D6S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.313V reset threshold, 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable power-on reset and code-execution error recovery.
For engineers reviewing the MAX6865UK23D6S+T datasheet, MAX6865UK23D6S+T pinout, MAX6865UK23D6S+T application, or MAX6865UK23D6S+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = +1.1V, immunity to short VCC transients, push-pull active-high RESET output, and compatibility with low-voltage µP systems requiring long watchdog timeout and precise brownout detection.
Technical Context
This device integrates three core functions: precision voltage monitoring with ±2.5% threshold accuracy over temperature, a glitch-immune manual reset input with 250ns MR-to-reset delay and internal 10kΩ pullup, and a watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 209s (typ). Its BiCMOS process enables stable operation from 1.2V to 5.5V supply.
The reset assertion logic combines VCC undervoltage, MR assertion, and watchdog timeout - all triggering the same RESET output. The 1200ms timeout (D6 option) is fixed and factory-set; no external components are required. Reset deassertion occurs only after VCC exceeds VTH + hysteresis and the full timeout elapses, ensuring robust power-rail stabilization before µP release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at VCC = 1.8V - enables multi-year battery life in glucose monitors and pagers. |
| Reset Threshold Voltage | 2.313V (±2.5%) - precisely matches 2.3V LDO outputs or 2.5V rail tolerances in portable systems. |
| Reset Timeout Period | 600–1200ms (D6 option) - ensures sufficient hold time for slow-ramping power supplies and FPGA configuration. |
| Watchdog Timeout | 95–487s (L suffix, typ 209s) - supports long-loop firmware execution without spurious resets in patient monitors. |
| VCC Validity Range | Operates down to VCC = +1.1V - guarantees valid RESET assertion during deep brownout conditions. |
| Output Type | Push-pull active-high RESET - eliminates need for external pullup and interfaces directly to µP reset inputs. |
| MR Input Logic | Active-low with 0.3×VCC VIL and internal 10kΩ pullup - compatible with open-drain GPIO and momentary switches. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, -40°C to +85°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives µP reset pin high during fault; sinks 500µA at VCC ≥ 2.38V. |
| 2 | GND | Ground reference - must be connected to system ground plane with low-inductance path for noise immunity. |
| 3 | MR | Active-low manual reset input - initiates reset when pulled below 0.3×VCC; internally pulled up to VCC. |
| 4 | WDI | Watchdog input - must toggle within 209s (typ) to prevent reset; accepts 150ns minimum pulse width. |
| 5 | VCC | Supply and monitored voltage input - requires 0.1µF bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year battery life in single-CR2032 medical devices. |
| Reset threshold accuracy | ±2.5% over -40°C to +85°C ensures reliable brownout detection across environmental extremes. |
| VCC transient immunity | Rejects 100mV glitches ≤40µs - prevents false resets in noisy automotive or industrial power rails. |
| No external components | Eliminates BOM cost and board space for RC timing networks or pullup resistors. |
| Guaranteed RESET validity | Valid down to VCC = +1.1V - supports reset assertion even during severe undervoltage events. |
Applications
| Portable Glucose Monitors | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power MCU sleep cycles. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during battery voltage sag below 2.3V and watchdog timeout if firmware hangs during sensor calibration. Use Value: Prevents corrupted glucose readings by forcing controlled reboot before ADC or radio misbehavior occurs. |
Use Scenario: Multi-parameter bedside monitor running real-time ECG, SpO₂, and NIBP algorithms on ARM Cortex-M4. IC Role / Device Role / Timing Role: Dual-fault detector monitoring both main 3.3V rail and backup coin-cell supply, with 1200ms reset hold for safe peripheral shutdown. Use Value: Ensures deterministic state recovery after power interruption, meeting IEC 60601-1 safety-critical reset requirements. |
| Industrial Handheld Scanners | Wearable Health Trackers |
|
Use Scenario: Rugged barcode scanner with cold-temperature operation (-20°C) and intermittent 2G/3G modem use. IC Role / Device Role / Timing Role: Brownout supervisor with 2.313V threshold and 209s watchdog - detects firmware lockups during RF handshaking sequences. Use Value: Eliminates field returns due to "frozen display" by auto-rebooting before battery depletion triggers uncontrolled shutdown. |
Use Scenario: Optical heart-rate tracker using photoplethysmography (PPG) with 7-day battery life target. IC Role / Device Role / Timing Role: Nanopower supervisor enabling <1µA system sleep current while maintaining watchdog supervision of sensor fusion firmware. Use Value: Extends usable runtime by avoiding unnecessary wake-ups caused by reset circuit leakage or marginal VCC noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK23D6S+T | No active-high RESET output - provides active-low open-drain or push-pull only. | Suitable where µP reset pin requires active-low assertion and external pullup is acceptable. | Select MAX6864UK23D6S+T only if active-low interface is mandatory and board layout allows pullup resistor placement. |
| TPS3838K23DBVR | Higher 4.5µA supply current; 2.32V threshold; no integrated watchdog timer. | Limited to basic voltage monitoring - cannot replace MAX6865UK23D6S+T in systems requiring watchdog supervision. | Choose TPS3838K23DBVR only for cost-sensitive, non-watchdog applications where 4.5µA ICC is acceptable. |
Compared with MAX6864UK23D6S+T and TPS3838K23DBVR, the MAX6865UK23D6S+T uniquely delivers active-high push-pull RESET, 170nA ICC, and 209s watchdog in one 5-pin SOT23 - enabling simpler, lower-power, and more robust reset architecture in portable medical devices.
Availability
MAX6865UK23D6S+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and low-power IoT edge nodes requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK23D6S+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 and mixed-signal ICs for power, sensing, and connectivity in demanding environments.
The MAX6854–MAX6869 family targets ultra-low-power supervisory needs in portable and medical electronics, emphasizing nanopower operation, wide VCC range, and integrated watchdog functionality for safety-critical firmware oversight.
FAQ
What is the exact reset threshold voltage of the MAX6865UK23D6S+T?
The MAX6865UK23D6S+T has a factory-trimmed reset threshold voltage of 2.313V, with ±2.5% tolerance over the full -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 VTH = 2.313V. The MAX6865UK23D6S+T maintains this accuracy without external calibration.
Does the MAX6865UK23D6S+T support active-high reset output?
Yes, the MAX6865UK23D6S+T features a push-pull active-high RESET output (pin 1), as confirmed in the MAX6865 pin description and Selector Guide. Unlike open-drain variants, this output drives high to VCC when deasserted and low to GND when asserted - eliminating the need for an external pullup resistor and simplifying interface to µP reset pins expecting active-high logic.
What is the watchdog timeout behavior of the MAX6865UK23D6S+T?
The MAX6865UK23D6S+T uses the "L" watchdog suffix, providing a typical timeout of 209s (min 95s, max 487s). The watchdog timer clears on any rising or falling edge at WDI (pin 4) and expires only if WDI remains static beyond this period. During reset assertion, the timer halts and resumes counting upon reset deassertion - ensuring deterministic supervision of long-duration firmware tasks.
Can the MAX6865UK23D6S+T operate reliably below 1.8V supply?
Yes, the MAX6865UK23D6S+T is fully specified from VCC = 1.2V to 5.5V and guarantees valid RESET assertion down to VCC = +1.1V. Its 170nA typical supply current at 1.8V and stable 2.313V threshold make it suitable for systems powered by single Li-ion cells under discharge or coin-cell-backed RTC circuits where voltage drops below 1.8V.
Is the MAX6865UK23D6S+T pin-compatible with other devices in the MAX68xx family?
The MAX6865UK23D6S+T shares the identical 5-pin SOT23-5 footprint and pinout (VCC, WDI, MR, GND, RESET) with MAX6864/MAX6866/MAX6867–MAX6869. However, it is not pin-compatible with MAX6854–MAX6863 or MAX6858/MAX6860 due to differing pin functions (e.g., CT or I.C. pins). Always verify pin mapping against the specific variant's Pin Description table before substitution.
MAX6865UK23D6S+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:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK23D6S+T FAQ
1.How can I place an order for MAX6865UK23D6S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK23D6S+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 MAX6865UK23D6S+T reliable?
The price and inventory of MAX6865UK23D6S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK23D6S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK23D6S+T?
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4.How is shipping managed for MAX6865UK23D6S+T?
MAX6865UK23D6S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK23D6S+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 MAX6865UK23D6S+T?
For technical support, including MAX6865UK23D6S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK23D6S+T requirements.
6.How does Aetrix verify that MAX6865UK23D6S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK23D6S+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 MAX6865UK23D6S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK23D6S+T?
All MAX6865UK23D6S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK23D6S+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 MAX6865UK23D6S+T part is unused and in its original packaging.
Return procedure for MAX6865UK23D6S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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