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Analog Devices Inc./Maxim Integrated MAX6865UK34D5L+T
- Part No.:
- MAX6865UK34D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK34D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,074
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Product details
Overview
The MAX6865UK34D5L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring, manual reset input (MR), and watchdog timer (WDI) functionality. It asserts an active-high push-pull RESET output when VCC drops below 3.400V (typ), MR is pulled low, or the watchdog times out after 209s (typ). Designed for ultra-low-power systems, it draws only 170nA (typ) supply current and guarantees valid reset operation down to VCC = +1.1V.
For engineers reviewing the MAX6865UK34D5L+T datasheet, MAX6865UK34D5L+T pinout, MAX6865UK34D5L+T application, or MAX6865UK34D5L+T equivalent, key selection criteria include its factory-trimmed 3.4V reset threshold, 300ms minimum reset timeout, 209s watchdog period, active-high push-pull reset output, and compatibility with battery-powered medical and portable electronics requiring robust brownout and software fault protection.
Technical Context
The MAX6865UK34D5L+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C and 0.5% hysteresis to prevent chatter during threshold crossings. Its watchdog timer detects WDI inactivity (no edge transition) for >209s (typ), clearing on any rising/falling edge, MR assertion, or RESET assertion.
This device integrates a 10kΩ internal MR pullup, glitch rejection (200ns), and MR-to-reset delay of 250ns. The active-high push-pull RESET output delivers VOH ≥ 0.8×VCC at ISOURCE = 500µA (VCC ≥ 2.38V) and VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.38V), ensuring reliable µP interface across 1.2V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.400V (typ), factory-trimmed; ensures reliable power-on reset for 3.3V systems with margin against brownout |
| Supply Current | 170nA (typ) at VCC = 1.8V; enables multi-year battery life in glucose monitors and wearables |
| Reset Timeout | 300ms (min), D5 option; provides sufficient hold time for µP initialization and clock stabilization |
| Watchdog Timeout | 209s (typ), L-suffix; supports long-loop firmware without excessive watchdog servicing overhead |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and ensures defined logic level at all VCC ≥ 1.1V |
| Operating Voltage | 1.2V to 5.5V; supports single-cell Li-ion, coin-cell, and multi-rail embedded systems |
| VCC Immunity | Valid RESET assertion guaranteed down to VCC = +1.1V; prevents undefined µP state during deep brownout |
Pinout & Package
Package: 5-pin SOT23-5, lead-free (RoHS-compliant), footprint-compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output; drives µP reset input high during fault conditions; referenced to VCC |
| 2 | GND | Ground reference for all internal circuitry and reset timing; must connect to system ground plane |
| 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; edge-sensitive (rising/falling); clears internal timer on each transition; requires no external RC |
| 5 | VCC | Main supply input; monitored for reset generation; 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 battery life in always-on medical sensors |
| Factory-trimmed VTH | 3.400V ±2.5% threshold eliminates external resistor networks and calibration effort |
| Watchdog immunity | 150ns minimum WDI pulse width tolerance prevents false timeouts from EMI or signal jitter |
| Glitch rejection | 200ns MR input filtering rejects board-level noise without external RC debounce |
| VCC transient immunity | Immune to 100mV VCC glitches ≤40µs duration, improving reliability in noisy automotive/industrial rails |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission every 5 minutes. IC Role / Device Role / Timing Role: Supervises 3.3V rail from coin cell; triggers full µP reset on brownout or firmware hang detected via WDI. Use Value: 170nA ICC extends CR2032 battery life beyond 2 years; 209s watchdog interval accommodates BLE connection handshaking without spurious resets. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ continuously for 72 hours. IC Role / Device Role / Timing Role: Monitors 1.8V µP core supply; asserts active-high RESET to halt corrupted data logging during voltage sag. Use Value: Guaranteed RESET validity down to VCC = +1.1V prevents memory corruption during final battery discharge phase. |
| Industrial Handheld Scanners | Smart Smoke Detectors |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, operating in warehouses with ESD-prone environments. IC Role / Device Role / Timing Role: Provides MR-initiated reset for field firmware updates and watchdog supervision of motor control firmware. Use Value: 200ns MR glitch rejection prevents accidental resets from ESD transients; 300ms reset timeout ensures complete µP boot sequence completion. |
Use Scenario: Battery-backed smoke alarm with self-test routine running every 30 seconds and RF reporting. IC Role / Device Role / Timing Role: Supervises 3.0V backup supply; uses WDI to verify self-test execution and trigger alarm reset on failure. Use Value: 3.4V reset threshold aligns precisely with end-of-life voltage for alkaline AA cells, enabling accurate low-battery warning before failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK34D5S+T | Same 3.4V threshold and 300ms timeout, but 3.3s watchdog (S-suffix) instead of 209s (L-suffix) | Better suited for fast-loop firmware where frequent WDI toggling is feasible; less tolerant of long idle periods | Select MAX6864UK34D5S+T when watchdog servicing can occur every ~1–2 seconds |
| TPS3837K33DBVR | 3.3V reset threshold (±0.5%), 200ms timeout, no watchdog; 1.6µA ICC - 10× higher than MAX6865UK34D5L+T | Lacks watchdog functionality; requires external circuitry for software fault detection | Choose TPS3837K33DBVR only if ultra-low ICC is not required and watchdog is implemented separately |
Compared with MAX6864UK34D5S+T, the MAX6865UK34D5L+T's 209s watchdog better supports infrequent-firmware-update scenarios; versus TPS3837K33DBVR, it delivers 10× lower ICC and integrated watchdog-critical for sealed, battery-only medical devices.
Availability
MAX6865UK34D5L+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, and smart safety sensors requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6865UK34D5L+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 MAX6865UK34D5L+T belongs to the MAX6854–MAX6869 nanopower supervisory family, engineered specifically for battery-critical systems needing simultaneous voltage monitoring, manual reset, and long-interval watchdog supervision in minimal footprint.
FAQ
What is the exact reset threshold voltage of the MAX6865UK34D5L+T?
The MAX6865UK34D5L+T has a factory-trimmed reset threshold of 3.400V (typical), with guaranteed tolerance of ±2.5% over -40°C to +85°C. This value corresponds to the "34" suffix in the part number and is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet. The actual threshold falls between 3.315V (min) and 3.485V (max) at +25°C.
Does the MAX6865UK34D5L+T support active-high or active-low reset output?
The MAX6865UK34D5L+T features an active-high push-pull RESET output, as indicated by the "65" in the part number (per Selector Guide). This means RESET goes high during fault conditions (VCC < threshold, MR low, or watchdog timeout) and returns low after the 300ms timeout expires. No external pullup is required.
What is the watchdog timeout period for the MAX6865UK34D5L+T?
The MAX6865UK34D5L+T uses the "L" watchdog suffix, providing a typical timeout period of 209 seconds, with min/max values of 95s and 487s respectively. This long interval is designed for firmware with extended idle or sleep cycles, reducing the frequency of required WDI toggling.
Can the MAX6865UK34D5L+T operate reliably at VCC = 1.2V?
Yes - the MAX6865UK34D5L+T is fully specified from VCC = 1.2V to 5.5V. Its reset function remains guaranteed down to VCC = +1.1V, and the active-high RESET output maintains VOH ≥ 0.8×VCC at ISOURCE = 10µA even at 1.2V, ensuring interoperability with low-voltage µPs.
Is the MAX6865UK34D5L+T pin-compatible with other devices in the MAX68xx family?
The MAX6865UK34D5L+T uses the standard 5-pin SOT23-5 package and shares identical pinout (RESET, GND, MR, WDI, VCC) with MAX6864/MAX6866/MAX6867–MAX6869 variants. However, it is not pin-compatible with MAX6854–MAX6863 (which lack WDI) or MAX6858/MAX6860 (which omit MR), as those use different pin assignments per functional configuration.
MAX6865UK34D5L+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:
- 3.4V
- 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
MAX6865UK34D5L+T FAQ
1.How can I place an order for MAX6865UK34D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK34D5L+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 MAX6865UK34D5L+T reliable?
The price and inventory of MAX6865UK34D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK34D5L+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK34D5L+T?
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4.How is shipping managed for MAX6865UK34D5L+T?
MAX6865UK34D5L+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK34D5L+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 MAX6865UK34D5L+T?
For technical support, including MAX6865UK34D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK34D5L+T requirements.
6.How does Aetrix verify that MAX6865UK34D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK34D5L+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 MAX6865UK34D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK34D5L+T?
All MAX6865UK34D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK34D5L+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 MAX6865UK34D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK34D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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