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Analog Devices Inc./Maxim Integrated MAX6865UK41D2S+T
- Part No.:
- MAX6865UK41D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK41D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,026
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Product details
Overview
The MAX6865UK41D2S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 4.100V reset threshold (±2.5%), 40ms minimum reset timeout, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP startup and fault recovery.
For engineers reviewing the MAX6865UK41D2S+T datasheet, MAX6865UK41D2S+T pinout, MAX6865UK41D2S+T application, or MAX6865UK41D2S+T equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed watchdog timing behavior, and real-world use cases for low-voltage, low-power embedded systems.
Technical Context
The MAX6865UK41D2S+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality into a single BiCMOS IC. Its reset output asserts when VCC falls below 4.100V, MR is pulled low, or WDI remains static beyond 3.3s (typ), with guaranteed reset validity down to VCC = +1.1V.
It uses an internal 10kΩ pullup on MR and accepts CMOS-level WDI transitions ≥150ns wide. The watchdog timer clears on any WDI edge, MR assertion, or active reset - enabling robust software execution monitoring without external components.
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 | 4.100V ±2.5% - factory-trimmed for precise brownout detection on 3.3V/4.2V Li-ion systems. |
| Reset Timeout Period | 40ms min (D2 option) - ensures µP completes power-rail stabilization before release from reset. |
| Watchdog Timeout | 3.3s typ (S suffix) - balances fault detection speed against acceptable software loop duration. |
| VCC Operating Range | 1.2V to 5.5V - supports operation across full battery discharge curve of 3.0–4.2V Li-ion packs. |
| Reset Output Type | Push-pull active-low - eliminates need for external pullup; sinks 50µA @ VCC ≥1.1V for direct µP reset input drive. |
| MR Input Behavior | Active-low with 10kΩ internal pullup - allows momentary switch-to-GND implementation without external biasing. |
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-low push-pull reset output; asserts low during VCC undervoltage, MR activation, or watchdog timeout; deasserts after 40ms timeout. |
| 2 | GND | Ground reference for all internal circuits; must be connected to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; triggers reset when pulled ≤0.3×VCC. |
| 4 | WDI | Watchdog input; requires rising/falling edge every <3.3s to prevent reset; immune to pulses <150ns. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF ceramic capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year shelf life on CR2032 in glucose monitors. |
| Guaranteed reset validity | RESET remains functional down to VCC = +1.1V - ensures fail-safe behavior during deep brownout. |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog oscillator eliminate BOM parts and layout area. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy portable environments. |
| Watchdog edge-triggered clear | WDI edge (rising or falling) resets watchdog timer - supports flexible software heartbeat placement. |
Applications
| Glucose Monitor | Patient Monitor |
|---|---|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission in disposable wearable patch. IC Role / Device Role / Timing Role: Supervises 3.3V rail from coin cell; asserts reset if voltage sags during RF burst or sensor excitation. Use Value: Prevents corrupted ADC readings or BLE packet loss by ensuring µP only operates within valid VCC window. |
Use Scenario: Portable ECG device powered by rechargeable Li-ion with sleep/wake cycles. IC Role / Device Role / Timing Role: Monitors main 3.3V domain; triggers watchdog reset if firmware hangs during analog front-end calibration. Use Value: Guarantees automatic recovery without user intervention, meeting IEC 60601-1 reliability requirements. |
| Smart Hearing Aid | Industrial Handheld Scanner |
Use Scenario: Ultra-low-power hearing aid using custom ASIC and MEMS microphone. IC Role / Device Role / Timing Role: Provides 4.100V reset threshold aligned to LiPo full-charge voltage; enables clean boot after battery insertion. Use Value: Eliminates need for RC-based reset circuits, reducing component count and PCB area in space-constrained earpiece. |
Use Scenario: Rugged barcode scanner with cold-temperature operation (-20°C). IC Role / Device Role / Timing Role: Supervises 3.3V logic rail; uses 40ms reset timeout to accommodate slow LDO settling after cold-start. Use Value: Ensures deterministic µP initialization across temperature extremes without firmware workarounds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK41D2S+T | No CT pin; identical reset threshold (4.100V), timeout (40ms), and watchdog (3.3s); differs only in RESET polarity (active-low push-pull same as MAX6865). | Same functional scope; lacks pin-selectable timeout but matches MAX6865UK41D2S+T in all monitored parameters. | Select MAX6864UK41D2S+T if CT pin is unused and footprint compatibility is required. |
| TPS3836K33DBVR | Fixed 3.08V reset threshold; 200ms min timeout; no watchdog; 1.5µA ICC - 9× higher quiescent current than MAX6865UK41D2S+T. | Suitable for non-watchdog, higher-VCC systems where ultra-low ICC is not critical. | Choose TPS3836K33DBVR only for cost-sensitive, non-battery-critical applications where 170nA ICC is unnecessary. |
Compared with MAX6864UK41D2S+T, the MAX6865UK41D2S+T offers identical supervision performance but is not pin-compatible due to CT pin presence; compared with TPS3836K33DBVR, it delivers 94% lower supply current and integrated watchdog - essential for long-life portable medical devices.
Availability
MAX6865UK41D2S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, smart hearing aids, and industrial handheld scanners requiring stable component supply and long-term lifecycle support.
Supply support for MAX6865UK41D2S+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6854–MAX6869 family delivers nanopower supervisory functions for battery-critical systems - engineered specifically for extended runtime in portable medical and consumer electronics.
FAQ
What is the exact reset threshold voltage of the MAX6865UK41D2S+T?
The MAX6865UK41D2S+T has a factory-trimmed reset threshold of 4.100V with ±2.5% tolerance over -40°C to +85°C. This value is defined by the "41" suffix per Table 2 in the datasheet and is guaranteed across temperature and supply voltage variations. The MAX6865UK41D2S+T maintains this accuracy without external calibration.
Does the MAX6865UK41D2S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK41D2S+T includes a watchdog timer with a typical timeout of 3.3s (S suffix), with min/max values of 1.5s and 7.75s. The timer resets on any WDI edge, MR assertion, or active reset condition - ensuring robust detection of firmware lockups in safety-critical portable devices using the MAX6865UK41D2S+T.
What is the function of Pin 1 (RESET) on the MAX6865UK41D2S+T?
Pin 1 of the MAX6865UK41D2S+T is the active-low push-pull reset output. It drives low during VCC undervoltage, MR activation, or watchdog timeout, and remains low for the full 40ms reset timeout period before deasserting. Unlike open-drain variants, it requires no external pullup and sinks 50µA at VCC ≥1.1V - directly compatible with standard µP reset inputs.
Can the MAX6865UK41D2S+T operate down to 1.2V supply voltage?
Yes, the MAX6865UK41D2S+T operates across VCC = 1.2V to 5.5V and guarantees valid reset output down to VCC = +1.1V. At 1.2V, its supply current is 190nA (typ), and RESET remains functional with VOL ≤0.3V under 50µA sink load - making it suitable for deep-discharge monitoring in Li-ion and coin-cell applications using the MAX6865UK41D2S+T.
How does the manual reset (MR) input behave on the MAX6865UK41D2S+T?
The MR input on the MAX6865UK41D2S+T is active-low with an internal 10kΩ pullup to VCC. Driving MR ≤0.3×VCC initiates reset, which persists for the full 40ms timeout after MR returns high. Glitch rejection is 200ns, and minimum pulse width is 1µs - enabling reliable pushbutton or FPGA-driven reset control without external debouncing in systems using the MAX6865UK41D2S+T.
MAX6865UK41D2S+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:
- 4.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 40ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK41D2S+T FAQ
1.How can I place an order for MAX6865UK41D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK41D2S+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 MAX6865UK41D2S+T reliable?
The price and inventory of MAX6865UK41D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK41D2S+T is usually 5 days.
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Once your MAX6865UK41D2S+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 MAX6865UK41D2S+T?
For technical support, including MAX6865UK41D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK41D2S+T requirements.
6.How does Aetrix verify that MAX6865UK41D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK41D2S+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 MAX6865UK41D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK41D2S+T?
All MAX6865UK41D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK41D2S+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 MAX6865UK41D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK41D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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