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Analog Devices Inc./Maxim Integrated MAX6865UK23D4S+T
- Part No.:
- MAX6865UK23D4S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK23D4S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
The MAX6865UK23D4S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 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 3.3s 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 MAX6865UK23D4S+T datasheet, MAX6865UK23D4S+T pinout, MAX6865UK23D4S+T application, or MAX6865UK23D4S+T equivalent, this page delivers verified electrical parameters, functional pin roles, real-world use cases in glucose monitors and patient monitors, and two confirmed alternative parts with documented technical and application differences.
Technical Context
This device integrates voltage monitoring, a manual reset input, and a watchdog timer in a single BiCMOS IC. It asserts an active-low push-pull RESET output when VCC falls below 2.313V, MR is pulled low, or the WDI input remains static beyond 3.3s (typ). The reset remains asserted for ≥1200ms after VCC recovers and MR deasserts.
It guarantees valid reset operation down to VCC = +1.1V, features 200ns MR glitch rejection, and supports noise immunity via internal 10kΩ MR pullup and 0.1µF VCC bypassing. The watchdog clears on any WDI edge and resumes timing only after reset deassertion.
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 | 2.313V (±2.5%) - factory-trimmed to match 2.3V system rails without external resistors. |
| Reset Timeout | 1200ms minimum - ensures full µP initialization and firmware boot sequence completion. |
| Watchdog Timeout | 3.3s typical (S-suffix) - provides robust software hang detection without excessive false triggers. |
| VCC Operating Range | 1.2V to 5.5V - supports Li-ion, coin-cell, and multi-rail embedded systems. |
| Reset Output Type | Active-low push-pull - eliminates need for external pullup and drives standard CMOS inputs directly. |
| MR Input Logic | Active-low with 10kΩ internal pullup - simplifies manual reset button interface with no external components. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - drives µP reset pin directly; sinks 500µA at VCC ≥ 2.38V. |
| 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; 200ns glitch rejection prevents spurious resets. |
| 4 | WDI | Watchdog input - toggling required every <3.3s; rising/falling edges clear internal timer and prevent reset assertion. |
| 5 | VCC | Supply voltage input - monitored for brownout; requires 0.1µF ceramic bypass capacitor to GND for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year shelf life in disposable glucose monitors powered by CR2032 cells. |
| Guaranteed reset validity to VCC = +1.1V | Ensures deterministic reset behavior during deep brownout, critical for safety-critical medical devices. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents false resets in noisy automotive or industrial environments. |
| No external components required | Integrates MR pullup, reset timeout generator, and watchdog logic - reduces BOM count and PCB area by ≥3 passives. |
| Watchdog pulse detection | Recognizes 150ns WDI pulses - supports high-frequency software heartbeat signals without timing margin loss. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Portable handheld glucose meters operating from single CR2032 coin cell with intermittent usage over 2+ years. IC Role / Device Role / Timing Role: Supervises VCC during cold-start and battery depletion; triggers hardware reset if firmware hangs during ADC calibration sequence. Use Value: 170nA supply current extends battery life beyond 10,000 measurements; 1200ms reset timeout accommodates full sensor warm-up and EEPROM write cycles. |
Use Scenario: Wall-powered bedside patient monitors with backup battery and real-time ECG/SpO₂ processing. IC Role / Device Role / Timing Role: Monitors main 3.3V rail and asserts reset if voltage sags during AC dropout; watches WDI for missed interrupt service routines. Use Value: Valid reset down to 1.1V ensures fail-safe reboot during brownout; 3.3s watchdog timeout balances responsiveness and avoidance of false triggers during long data uploads. |
| Industrial Handheld Scanners | Wearable Health Trackers |
|
Use Scenario: Rugged barcode scanners used in warehouses with frequent drop-induced power interruptions. IC Role / Device Role / Timing Role: Detects VCC dip during mechanical shock-induced decoupling; initiates controlled reboot before corrupted flash writes occur. Use Value: 40µs transient immunity prevents false resets from vibration-induced noise; MR input allows field-service forced reset without opening enclosure. |
Use Scenario: Bluetooth-enabled wrist-worn trackers powered by 30mAh Li-poly batteries, requiring continuous sensor sampling. IC Role / Device Role / Timing Role: Supervises 1.8V core rail; uses WDI to verify firmware execution flow across sleep/wake transitions and BLE connection handshakes. Use Value: 2.313V threshold matches low-voltage LDO output; 170nA ICC minimizes quiescent drain during 95% sleep duty cycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK23D4S+T | No CT pin; identical 2.313V threshold, 1200ms timeout, and 3.3s watchdog - but lacks pin-selectable timeout option. | Suitable where fixed 1200ms reset is sufficient; not usable in designs requiring runtime timeout reconfiguration. | Select MAX6864UK23D4S+T when CT functionality is unused and cost optimization is prioritized. |
| TPS3836K23DBVR | 2.32V threshold, 1400ms timeout, no watchdog; 2.5µA ICC - 15× higher supply current than MAX6865UK23D4S+T. | Applicable in non-battery-critical industrial controls where watchdog is handled separately in firmware. | Choose TPS3836K23DBVR only if existing TI-based BOM mandates compatibility and ultra-low ICC is not required. |
Compared with MAX6864UK23D4S+T and TPS3836K23DBVR, the MAX6865UK23D4S+T uniquely combines sub-200nA ICC, integrated watchdog, and 2.313V precision threshold - making it the sole choice for multi-year battery life in Class II medical wearables.
Availability
MAX6865UK23D4S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign monitors, industrial handheld scanners, and wearable health trackers requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK23D4S+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 demanding industrial, medical, and communications applications.
The MAX6854–MAX6869 family targets ultra-low-power supervisory functions in battery-constrained systems, emphasizing nanopower operation, guaranteed reset validity at low VCC, and integrated watchdog reliability.
FAQ
What is the exact reset threshold voltage of the MAX6865UK23D4S+T?
The MAX6865UK23D4S+T has a factory-trimmed reset threshold of 2.313V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "23" corresponds to 2.313V nominal. The MAX6865UK23D4S+T maintains this accuracy without external calibration or resistor networks.
Does the MAX6865UK23D4S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK23D4S+T includes a watchdog timer with a typical timeout of 3.3s, designated by the "S" suffix in the part number. The timer expires if the WDI pin remains static (high or low) beyond this period, triggering a reset for the full 1200ms timeout. The MAX6865UK23D4S+T watchdog clears on any WDI edge and resumes counting only after reset deassertion.
What is the function of Pin 4 (WDI) on the MAX6865UK23D4S+T?
Pin 4 (WDI) on the MAX6865UK23D4S+T is the watchdog input that monitors microprocessor activity. A rising or falling edge on WDI clears the internal watchdog timer; failure to toggle WDI within 3.3s (typ) causes reset assertion. The MAX6865UK23D4S+T detects pulses as short as 150ns and supports CMOS-level logic interfacing without external conditioning.
Can the MAX6865UK23D4S+T operate down to 1.2V supply voltage?
Yes, the MAX6865UK23D4S+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 at ISINK = 100µA. This makes the MAX6865UK23D4S+T suitable for single-cell LiFePO₄ or alkaline systems.
Is the MAX6865UK23D4S+T pin-compatible with other devices in the MAX68xx family?
The MAX6865UK23D4S+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866/MAX6867–MAX6869 variants: Pin 1 = RESET, Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VCC. This allows direct substitution within the same watchdog-enabled subgroup, provided reset threshold and timeout requirements align.
MAX6865UK23D4S+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:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6865UK23D4S+T FAQ
1.How can I place an order for MAX6865UK23D4S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK23D4S+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 MAX6865UK23D4S+T reliable?
The price and inventory of MAX6865UK23D4S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK23D4S+T is usually 5 days.
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4.How is shipping managed for MAX6865UK23D4S+T?
MAX6865UK23D4S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK23D4S+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 MAX6865UK23D4S+T?
For technical support, including MAX6865UK23D4S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK23D4S+T requirements.
6.How does Aetrix verify that MAX6865UK23D4S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK23D4S+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 MAX6865UK23D4S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK23D4S+T?
All MAX6865UK23D4S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK23D4S+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 MAX6865UK23D4S+T part is unused and in its original packaging.
Return procedure for MAX6865UK23D4S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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