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Analog Devices Inc./Maxim Integrated MAX6865UK46D5S+T
- Part No.:
- MAX6865UK46D5S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK46D5S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,610
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Product details
Overview
The MAX6865UK46D5S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring 4.625V factory-trimmed reset threshold, 300ms minimum reset timeout, active-high push-pull RESET output, manual reset input (MR), and watchdog timer with 3.3s typical timeout. It monitors VCC supply integrity and asserts reset during power-up, brownout, or software hang in battery-powered medical and portable electronics.
For engineers reviewing the MAX6865UK46D5S+T datasheet, MAX6865UK46D5S+T pinout, MAX6865UK46D5S+T application, or MAX6865UK46D5S+T equivalent, this page delivers verified electrical specs, functional pin roles, real-world use cases in glucose monitors and PDAs, and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The MAX6865UK46D5S+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality within a single BiCMOS IC. Its reset logic triggers on VCC falling below 4.625V ±2.5%, MR low pulse ≥1µs, or WDI inactivity exceeding 3.3s (typ), with guaranteed reset validity down to VCC = 1.1V.
It uses an internal 10kΩ pullup on MR and supports noise-immune operation via glitch rejection (200ns) and transient immunity (≤40µs at 100mV overdrive). The active-high push-pull RESET output drives high with VOH ≥0.8×VCC at ISOURCE = 500µA (VCC ≥2.38V), sinking <0.3V when deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 4.625V ±2.5% - precisely set for 5V system brownout detection without external resistors |
| Reset Timeout Period | 300ms (min) - ensures µP completes full initialization before release from reset |
| Watchdog Timeout | 3.3s (typ), S-suffix - detects firmware hangs in embedded applications with moderate response latency |
| Supply Current | 170nA (typ) at VCC = 1.8V - enables multi-year battery life in always-on patient monitors |
| Operating Voltage Range | 1.2V to 5.5V - supports Li-ion, coin-cell, and regulated 3.3V/5V rails without level-shifting |
| RESET Output Type | Active-high push-pull - directly interfaces to µP reset inputs requiring high-true logic without pullup |
| VCC Validity Limit | Guaranteed RESET assertion down to VCC = 1.1V - maintains reliable reset signaling through deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin supervisory ICs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during fault condition; no external pullup required |
| 2 | GND | Ground reference - must be connected to system ground plane for stable reset timing and noise immunity |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS-level signals or momentary switch to GND |
| 4 | WDI | Watchdog input - toggling edge clears internal timer; static high/low >3.3s triggers reset |
| 5 | VCC | Supply voltage input - monitored for reset assertion; requires 0.1µF bypass capacitor to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - extends battery life in glucose meters and wearable health devices |
| Factory-trimmed VTH | 4.625V ±2.5% - eliminates calibration overhead and external resistor networks in production |
| Watchdog immunity | 150ns minimum WDI pulse width - tolerates fast MCU I/O transitions without spurious timeouts |
| Glitch rejection | 200ns MR input filtering - prevents false resets from ESD or PCB trace coupling |
| VCC transient immunity | 40µs max duration at 100mV overdrive - suppresses reset during brief supply dips in noisy environments |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
|
Use Scenario: Continuous blood glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset if main supply drops below 4.625V or firmware fails to service watchdog within 3.3s. Use Value: Prevents corrupted sensor readings or unsafe insulin dosing due to undetected MCU lockup or brownout. |
Use Scenario: Portable ECG and SpO₂ units operating on single CR2032 coin cell for >2 years. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output and provides 300ms reset hold time to ensure ADC and BLE controller boot reliability. Use Value: Enables ultra-low-quiescent-current design while guaranteeing deterministic startup and crash recovery. |
| PDAs / Handheld Terminals | Industrial Data Loggers |
|
Use Scenario: Ruggedized PDA used in warehouse inventory scanning with intermittent USB charging. IC Role / Device Role / Timing Role: Detects VCC sag during hot-plug events and asserts active-high RESET to prevent flash corruption during write operations. Use Value: Eliminates need for external RC reset circuits and improves field reliability under dynamic power conditions. |
Use Scenario: Remote environmental logger powered by solar + supercapacitor, operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Provides valid reset signal down to VCC = 1.1V and operates across full industrial temperature range. Use Value: Ensures robust boot sequencing even during cold-start or marginal energy harvesting conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6865UK46D5L+T | Same package, pinout, and reset threshold; watchdog timeout 209s (typ) instead of 3.3s | Suitable for systems requiring longer watchdog intervals (e.g., infrequently polled sensors) | Select when firmware execution cycles exceed 3s and shorter timeout would cause nuisance resets |
| TPS3837K33DBVR | 3.3V fixed reset threshold, 200ms reset timeout, no watchdog, SOT23-5 | Lacks WDI functionality; suited for simple power-monitoring-only designs | Choose only if watchdog capability is unnecessary and 3.3V threshold matches system rail |
Compared with MAX6865UK46D5S+T, the L-suffix variant trades faster watchdog response for extended timeout headroom, while TPS3837K33DBVR offers cost reduction at the expense of supervision depth-neither is pin-compatible nor functionally interchangeable without schematic and firmware revision.
Availability
MAX6865UK46D5S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, PDAs, and industrial data loggers requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6865UK46D5S+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 interface applications in industrial, medical, and communications markets.
The MAX68xx family delivers nanopower supervisory solutions optimized for battery-critical portable and medical electronics, combining voltage monitoring, manual reset, and watchdog functions in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6865UK46D5S+T?
The MAX6865UK46D5S+T has a factory-trimmed reset threshold of 4.625V with ±2.5% tolerance over temperature. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "46" corresponds to nominal 4.625V. The device guarantees reset assertion when VCC falls below this threshold and holds reset for 300ms after VCC recovers above it.
Does the MAX6865UK46D5S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6865UK46D5S+T includes a watchdog timer with a typical timeout period of 3.3s, indicated by the "S" suffix in the part number. This is verified in Table 3 (Watchdog Timeout) and the Ordering Information section. The timer expires if the WDI pin remains static (high or low) beyond this interval, triggering a reset for the configured 300ms timeout period.
What type of RESET output does the MAX6865UK46D5S+T provide, and how is it configured?
The MAX6865UK46D5S+T provides an active-high push-pull RESET output, confirmed by its position in the Selector Guide (row MAX6865) and Pin Description section. Unlike open-drain variants, this output drives high actively and requires no external pullup resistor. It sources ≥0.8×VCC at 500µA load (VCC ≥2.38V) and sinks <0.3V when deasserted.
What is the minimum reset timeout period for the MAX6865UK46D5S+T, and how is it selected?
The MAX6865UK46D5S+T has a fixed minimum reset timeout period of 300ms, denoted by the "D5" suffix in its part number. This value is specified in Table 4 (Reset Timeout Periods) as D5 = 300ms (min)/450ms (typ)/600ms (max). No external components or pin strapping are needed-the timeout is factory-programmed and immutable.
Is the MAX6865UK46D5S+T compatible with 1.8V and 3.3V supply rails?
Yes, the MAX6865UK46D5S+T operates across 1.2V to 5.5V, fully supporting 1.8V and 3.3V systems. Its 170nA typical supply current at 1.8V and guaranteed reset validity down to VCC = 1.1V make it suitable for low-voltage battery-powered designs. Electrical characteristics-including VOH, VOL, and watchdog timing-are specified across this full range.
MAX6865UK46D5S+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:
- 4.625V
- 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
MAX6865UK46D5S+T FAQ
1.How can I place an order for MAX6865UK46D5S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK46D5S+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 MAX6865UK46D5S+T reliable?
The price and inventory of MAX6865UK46D5S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK46D5S+T is usually 5 days.
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Once your MAX6865UK46D5S+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 MAX6865UK46D5S+T?
For technical support, including MAX6865UK46D5S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK46D5S+T requirements.
6.How does Aetrix verify that MAX6865UK46D5S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK46D5S+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 MAX6865UK46D5S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK46D5S+T?
All MAX6865UK46D5S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK46D5S+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 MAX6865UK46D5S+T part is unused and in its original packaging.
Return procedure for MAX6865UK46D5S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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