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Analog Devices Inc./Maxim Integrated MAX6865UK36D2S+T
- Part No.:
- MAX6865UK36D2S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK36D2S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,989
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Product details
Overview
The MAX6865UK36D2S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, a factory-trimmed 3.600V reset threshold (±2.5%), 40ms minimum reset timeout, and integrated watchdog timer with 3.3s typical timeout. It monitors VCC, responds to manual reset (MR), and triggers reset on watchdog expiration - designed for battery-powered medical and portable electronics requiring guaranteed reset validity down to VCC = +1.1V.
For engineers reviewing the MAX6865UK36D2S+T datasheet, MAX6865UK36D2S+T pinout, MAX6865UK36D2S+T application, or MAX6865UK36D2S+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset/watchdog timing, true low-power behavior across temperature, and validated alternative options for portable equipment design.
Technical Context
The MAX6865UK36D2S+T implements a dual-trigger reset architecture: it asserts reset when VCC falls below 3.600V, when MR is pulled low, or when the watchdog input (WDI) remains static beyond 3.3s (typ). Its internal timer guarantees reset remains asserted for ≥40ms after VCC recovers above threshold and MR deasserts.
It uses BiCMOS process technology (2848 transistors), supports push-pull active-high RESET output, features 10kΩ internal MR pullup, and provides immunity to VCC transients ≤40µs at 100mV overdrive - all while maintaining valid reset operation down to VCC = +1.1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.600V ±2.5% - precisely sets power-fail detection point for 3.3V systems with margin |
| Supply Current | 170nA (typ) at +25°C - enables multi-year battery life in glucose monitors and wearables |
| Reset Timeout | 40ms (min) - ensures µP completes power-up initialization before release |
| Watchdog Timeout | 3.3s (typ), S-suffix - detects firmware hangs in embedded applications without excessive polling |
| VCC Operating Range | 1.2V to 5.5V - supports single-cell Li-ion, coin-cell, and multi-rail systems |
| Reset Output Type | Push-pull active-high - eliminates external pullup, drives µP reset pin directly |
| Guaranteed Reset Validity | Down to VCC = +1.1V - ensures deterministic reset state during deep brownout |
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 output; drives high during reset assertion; referenced to VCC; no external pullup required |
| 2 | GND | Ground reference for all internal circuits and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; accepts CMOS logic levels |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears internal timer on transition; detects ≥150ns pulses |
| 5 | VCC | Supply voltage input and monitored rail; requires 0.1µF bypass 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 patient monitors |
| Watchdog immunity to noise | WDI detects only clean edges; ignores glitches <150ns, preventing false timeouts in noisy environments |
| VCC transient immunity | Immune to ≤40µs VCC dips of 100mV - avoids spurious resets during switching regulator ripple |
| No external components | Integrated MR pullup, precision voltage reference, and timing capacitor eliminate BOM cost and layout area |
| Valid reset at low VCC | RESET output remains functional down to VCC = +1.1V - critical for graceful shutdown in brownout |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervises 3.3V system rail, asserts reset on brownout or firmware hang detected via WDI, ensures safe restart before sensor calibration. Use Value: Prevents corrupted glucose readings during power instability; 170nA ICC extends disposable sensor life beyond 14 days. |
Use Scenario: Portable ECG/SpO₂ device powered by CR2032 coin cell with intermittent wireless reporting. IC Role / Device Role / Timing Role: Monitors main supply, triggers reset if MCU fails to service watchdog within 3.3s, guarantees known state after battery insertion or low-VCC recovery. Use Value: Eliminates risk of silent firmware lockup during clinical measurement; 40ms reset timeout aligns with ADC initialization sequence. |
| Industrial Handheld Scanners | Smart Wearable Trackers |
Use Scenario: Rugged barcode scanner with cold-temperature operation (-20°C) and frequent drop-induced power interruptions. IC Role / Device Role / Timing Role: Detects VCC dip below 3.600V during mechanical shock-induced supply sag; holds reset for ≥40ms to prevent partial flash writes. Use Value: Ensures NAND flash integrity during field use; 1.1V reset validity prevents undefined MCU state during rapid battery voltage decay. |
Use Scenario: Fitness tracker with motion-sensing SoC, BLE radio, and 150mAh LiPo battery. IC Role / Device Role / Timing Role: Provides dual-fault protection: VCC monitoring + software watchdog; MR pin enables user-initiated factory reset via button. Use Value: Reduces firmware crash recovery time from minutes to milliseconds; push-pull active-high RESET simplifies PCB routing versus open-drain alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK36D2S+T | Same 3.600V threshold, 40ms timeout, and 3.3s watchdog, but features active-low push-pull RESET output | Requires µP with active-low reset input; incompatible with active-high reset designs without level-shifting | Select when interfacing with legacy µPs requiring active-low reset assertion |
| TPS3836K33DBVR | 3.3V fixed threshold, 200ms min timeout, no watchdog; 1.6µA ICC - 9× higher than MAX6865UK36D2S+T | Lacks watchdog functionality; unsuitable for firmware hang detection; higher current limits battery life in always-on devices | Choose only for cost-sensitive, non-watchdog applications where 3.3V threshold suffices and µA-level current is acceptable |
Compared with MAX6865UK36D2S+T, MAX6864UK36D2S+T offers identical supervision timing but inverted reset polarity, while TPS3836K33DBVR trades off watchdog capability and nanopower operation for lower unit cost - making MAX6865UK36D2S+T optimal for space-constrained, long-life portable medical devices.
Availability
MAX6865UK36D2S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign recorders, industrial handheld scanners, and smart wearable trackers requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK36D2S+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX6854–MAX6869 family was designed specifically for ultra-low-power microprocessor supervision in battery-critical portable and medical electronics, integrating voltage monitoring, manual reset, and watchdog functions into minimal 5-pin SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX6865UK36D2S+T?
The MAX6865UK36D2S+T has a factory-trimmed reset threshold of 3.600V 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 '36' corresponds to 3.600V nominal. The device guarantees reset assertion when VCC falls below this threshold and maintains reset for ≥40ms after VCC rises above it.
Does the MAX6865UK36D2S+T include a watchdog timer, and what is its timeout?
Yes, the MAX6865UK36D2S+T includes a watchdog timer with a typical timeout of 3.3s, indicated by the 'S' suffix in the part number. The timer expires if the WDI pin remains static (no rising or falling edge) beyond this period, triggering a reset for the configured 40ms timeout. The timer clears on any WDI edge, MR assertion, or active reset - ensuring robust firmware supervision.
What is the function of Pin 1 on the MAX6865UK36D2S+T, and how does it differ from other variants?
Pin 1 of the MAX6865UK36D2S+T is the active-high push-pull RESET output. Unlike MAX6864 (active-low RESET) or MAX6866 (open-drain RESET), this variant drives high during reset assertion and requires no external pullup. Its VOH is guaranteed ≥0.8 × VCC when sourcing 500µA, enabling direct interface with µPs that accept active-high reset signals.
Can the MAX6865UK36D2S+T operate reliably at very low supply voltages?
Yes, the MAX6865UK36D2S+T guarantees valid reset operation down to VCC = +1.1V, as specified in the Electrical Characteristics table. Below this voltage, RESET output behavior is not guaranteed. This feature ensures deterministic system state during deep brownout conditions common in coin-cell and single-Li-ion applications - a key differentiator from higher-current supervisors.
What packaging and environmental specifications apply to the MAX6865UK36D2S+T?
The MAX6865UK36D2S+T is supplied in a RoHS-compliant, lead-free 5-pin SOT23-5 package, rated for operation from -40°C to +85°C. The '+T' suffix confirms lead-free packaging per Maxim's ordering convention. Its small footprint (2.9mm × 1.6mm) and low thermal resistance support high-density portable PCB layouts without thermal derating concerns.
MAX6865UK36D2S+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:
- 3.6V
- 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
MAX6865UK36D2S+T FAQ
1.How can I place an order for MAX6865UK36D2S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK36D2S+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 MAX6865UK36D2S+T reliable?
The price and inventory of MAX6865UK36D2S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK36D2S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK36D2S+T?
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4.How is shipping managed for MAX6865UK36D2S+T?
MAX6865UK36D2S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK36D2S+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 MAX6865UK36D2S+T?
For technical support, including MAX6865UK36D2S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK36D2S+T requirements.
6.How does Aetrix verify that MAX6865UK36D2S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK36D2S+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 MAX6865UK36D2S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK36D2S+T?
All MAX6865UK36D2S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK36D2S+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 MAX6865UK36D2S+T part is unused and in its original packaging.
Return procedure for MAX6865UK36D2S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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