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Analog Devices Inc./Maxim Integrated MAX6865UK42D5L+T
- Part No.:
- MAX6865UK42D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK42D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,138
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Product details
Overview
MAX6865UK42D5L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.200V reset threshold (±2.5%), 450ms minimum reset timeout (D5), and watchdog timer with 209s typical timeout (L suffix). It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - used in battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6865UK42D5L+T datasheet, MAX6865UK42D5L+T pinout, MAX6865UK42D5L+T application, or MAX6865UK42D5L+T equivalent, this page delivers verified specifications, functional pin mapping, real-world use cases, and validated alternative parts for low-power embedded system design and BOM optimization.
Technical Context
The MAX6865UK42D5L+T integrates voltage monitoring, manual reset input (MR), and watchdog timer (WDI) in a single BiCMOS IC. Its reset assertion logic combines VCC falling below 4.200V, MR low pulse ≥1µs, or WDI inactivity beyond 209s (typ), with guaranteed reset validity down to VCC = +1.1V.
It uses internal 10kΩ MR pullup and supports push-pull active-high RESET output. The watchdog clears on any WDI edge (rising/falling), and reset remains asserted for 450ms min after VCC recovery, MR deassertion, or watchdog timeout expiration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on medical sensors. |
| Reset Threshold Voltage | 4.200V ±2.5% - factory-trimmed to monitor 3.3V/5V rail brownout with precise hysteresis (0.5% of VTH). |
| Reset Timeout Period | 450ms min (D5 option) - ensures µP completes power-up initialization before release from reset. |
| Watchdog Timeout | 209s typ (L suffix) - suitable for long-cycle firmware tasks without excessive polling overhead. |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery systems including single Li-ion (3.0–4.2V) and dual alkaline (1.8–3.2V). |
| RESET Output Type | Push-pull active-high - eliminates external pullup, drives µP reset pin directly with VOH ≥0.8×VCC at 500µA. |
| Guaranteed Reset Validity | To VCC = +1.1V - maintains deterministic reset state during deep brownout, critical for data integrity in patient monitors. |
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 - asserts high during fault conditions; sinks 500µA while deasserted, referenced to VCC. |
| 2 | GND | Ground reference - must connect to system common ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS logic; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input - detects rising/falling edges; resets internal timer on each transition; immune to <150ns glitches. |
| 5 | VCC | Supply voltage input - monitors reset threshold; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in portable diagnostics by >10 years on CR2032. |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets in noisy ECG or pulse-oximeter environments. |
| No external components | Self-contained supervision - no timing capacitors, pullups, or RC networks required for basic operation. |
| Watchdog edge-triggered clear | WDI cleared on any logic transition - enables robust software supervision without dedicated toggle pins. |
| Valid reset at low VCC | RESET guaranteed functional down to VCC = +1.1V - ensures safe shutdown sequencing in deep discharge states. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose monitoring (CGM) patch worn for 7–14 days on single coin cell. IC Role / Device Role / Timing Role: Supervises MCU power-up, detects brownout during RF transmission, and resets firmware lockup via WDI heartbeat. Use Value: 170nA ICC extends battery life beyond clinical wear period; 209s watchdog timeout aligns with sensor calibration cycle. |
Use Scenario: Portable ECG or SpO₂ device with sleep mode and intermittent measurement bursts. IC Role / Device Role / Timing Role: Ensures reliable MCU restart after power interruption; monitors 3.3V rail stability during analog front-end activation. Use Value: 4.200V reset threshold matches LDO output tolerance; 450ms reset timeout accommodates ADC settling and BLE reconnection. |
| Industrial Handheld Scanners | Smart Wearable Sensors |
|
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, subjected to thermal cycling and ESD events. IC Role / Device Role / Timing Role: Provides MR-initiated field reset, guards against firmware hang during motor driver faults, and validates VCC during cold-start. Use Value: MR internal 10kΩ pullup eliminates external resistor; 1.1V reset validity prevents undefined behavior during battery cold cranking. |
Use Scenario: Fitness tracker with motion-sensing SoC, operating intermittently on thin-film battery. IC Role / Device Role / Timing Role: Supervises ultra-low-power MCU wake-up sequence and enforces watchdog reset if sensor fusion algorithm stalls. Use Value: SOT23-5 footprint minimizes PCB area; 170nA ICC avoids compromising standby current budget (<1µA target). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK42D5L+T | Same 4.200V threshold, 450ms timeout, 209s watchdog, but active-low push-pull RESET output. | Requires inverted reset logic on µP side; not drop-in for active-high reset pin designs. | Select when host MCU reset pin is active-low and board layout cannot accommodate level-shifting. |
| TPS3837K33DBVR | 3.3V fixed threshold, 200ms timeout, no watchdog, 1.6µA ICC - higher quiescent current, no WDI functionality. | Limited to fixed-threshold 3.3V systems; unsuitable for long-cycle watchdog supervision or sub-µA battery apps. | Choose only for cost-sensitive, non-battery, 3.3V-only applications where watchdog is unnecessary. |
Compared with MAX6865UK42D5L+T, MAX6864UK42D5L+T offers identical supervision parameters but inverted reset polarity, while TPS3837K33DBVR trades ultra-low power and watchdog capability for lower unit cost in simpler 3.3V systems.
Availability
MAX6865UK42D5L+T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered industrial scanners, and wearable health sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK42D5L+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 delivers nanopower supervision with integrated watchdog and manual reset - engineered specifically for battery-critical portable healthcare and IoT edge devices.
FAQ
What is the exact reset threshold voltage of MAX6865UK42D5L+T?
The MAX6865UK42D5L+T has a factory-trimmed reset threshold of 4.200V with ±2.5% tolerance over temperature (-40°C to +85°C), as defined by the "42" suffix in its part number per Maxim's Threshold Suffix Guide. This value is measured at VCC falling and includes 0.5% hysteresis to prevent chatter near threshold.
Does MAX6865UK42D5L+T support active-high or active-low reset output?
MAX6865UK42D5L+T provides an active-high push-pull RESET output - it drives high during reset assertion and low when deasserted. This is confirmed by its pin description (Pin 1 = RESET, active-high) and Selector Guide entry, distinguishing it from MAX6864 (active-low) and MAX6866 (open-drain).
What is the watchdog timeout behavior of MAX6865UK42D5L+T?
MAX6865UK42D5L+T features a watchdog timer with 209s typical timeout (L suffix), with min/max of 95s/487s over temperature. The timer clears on any WDI edge (rising or falling) and expires only if WDI remains static longer than the timeout - triggering a full 450ms reset pulse.
Can MAX6865UK42D5L+T operate down to 1.2V supply?
Yes, MAX6865UK42D5L+T operates across VCC = 1.2V to 5.5V and guarantees valid reset functionality down to VCC = +1.1V. At 1.2V, supply current is 190nA (typ), and RESET output maintains VOH ≥0.8×VCC with 500µA source capability - enabling use in single-cell alkaline or deeply discharged Li-ion systems.
Is external circuitry required for manual reset on MAX6865UK42D5L+T?
No external circuitry is required for manual reset on MAX6865UK42D5L+T: Pin 3 (MR) includes an internal 10kΩ pullup to VCC, accepts standard CMOS logic levels, and requires only a momentary switch to GND. A 0.1µF capacitor from MR to GND is optional for enhanced noise immunity in EMI-heavy environments.
MAX6865UK42D5L+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:
- 4.2V
- 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
MAX6865UK42D5L+T FAQ
1.How can I place an order for MAX6865UK42D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK42D5L+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 MAX6865UK42D5L+T reliable?
The price and inventory of MAX6865UK42D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK42D5L+T is usually 5 days.
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Once your MAX6865UK42D5L+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 MAX6865UK42D5L+T?
For technical support, including MAX6865UK42D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK42D5L+T requirements.
6.How does Aetrix verify that MAX6865UK42D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK42D5L+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 MAX6865UK42D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK42D5L+T?
All MAX6865UK42D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK42D5L+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 MAX6865UK42D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK42D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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