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Analog Devices Inc./Maxim Integrated MAX6865UK33D5L+T
- Part No.:
- MAX6865UK33D5L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK33D5L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,055
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Product details
Overview
The MAX6865UK33D5L+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 3.3V reset threshold (±2.5%), 300ms minimum reset timeout, and integrated watchdog timer with 209s typical timeout. It monitors VCC, responds to manual reset (MR), and asserts reset on voltage drop, MR assertion, or watchdog expiration - used in battery-powered medical and portable electronics for reliable power-up/brownout recovery.
For engineers reviewing the MAX6865UK33D5L+T datasheet, MAX6865UK33D5L+T pinout, MAX6865UK33D5L+T application, or MAX6865UK33D5L+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the precise variant.
Technical Context
The MAX6865UK33D5L+T implements a dual-trigger reset architecture: it asserts reset when VCC falls below 3.3V (±2.5%), when MR is pulled low, or when the watchdog input (WDI) remains static beyond 209s (typ). Its internal timer guarantees reset remains asserted for ≥300ms after VCC recovers above threshold and MR deasserts.
It features push-pull active-high RESET output referenced to VCC, 10kΩ internal MR pullup, WDI edge-sensitive watchdog clearing, and guaranteed reset validity down to VCC = 1.1V - enabling robust operation in low-voltage, noise-prone battery systems without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.3V ±2.5% - precisely matches 3.3V logic rails; ensures reset triggers before µP functional failure. |
| Supply Current | 170nA typ at +25°C - enables multi-year battery life in glucose monitors and pagers. |
| Reset Timeout | 300ms min (D5 option) - provides sufficient time for full µP initialization and clock stabilization. |
| Watchdog Timeout | 209s typ (L suffix) - supports long-cycle firmware tasks while detecting catastrophic hangs. |
| VCC Operating Range | 1.2V to 5.5V - operates across single-cell Li-ion (3.0–4.2V), alkaline (1.2–1.5V ×2), and regulated 3.3V/5V rails. |
| Reset Output Type | Push-pull active-high - drives high-impedance µP reset inputs directly without pullup resistors. |
| Guaranteed Reset Validity | Down to VCC = 1.1V - maintains deterministic reset state during deep brownout, preventing undefined µP behavior. |
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 reset output - asserts high during fault conditions; sinks/source current per VOH/VOL specs; no external pullup needed. |
| 2 | GND | Ground reference - must connect to system ground plane; shared return for all internal circuits. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 10kΩ; accepts CMOS levels; 1µs minimum pulse width. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on each transition; rejects <150ns glitches. |
| 5 | VCC | Supply voltage input - monitored for reset generation; requires 0.1µF bypass capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current - reduces quiescent drain in always-on medical devices by >99% vs. standard supervisors. |
| Immunity to VCC transients | Rejects ≤40µs transients at 100mV overdrive - prevents false resets during switching regulator noise or load dump. |
| No external components | Integrated MR pullup, precision voltage reference, and watchdog oscillator - eliminates BOM cost and layout area. |
| Guaranteed reset at low VCC | Valid RESET output down to VCC = 1.1V - ensures deterministic reset even during severe brownout before µP loses functionality. |
| Watchdog edge sensitivity | Clears on any WDI rising or falling edge - enables flexible software-driven watchdog refresh without strict timing windows. |
Applications
| Portable Glucose Monitors | Patient Vital Sign Loggers |
|---|---|
Use Scenario: Continuous subcutaneous glucose sensing with Bluetooth LE transmission and 3.3V MCU operation on coin-cell battery. IC Role / Device Role / Timing Role: Supervises 3.3V rail, triggers reset on battery sag or firmware hang, and extends usable battery life via 170nA ICC. Use Value: Prevents missed hypoglycemia alerts by ensuring MCU restarts reliably after brownout - critical for FDA Class II device compliance. |
Use Scenario: Wearable ECG patch recording heart rate and SpO₂ for 72+ hours on CR2032 battery. IC Role / Device Role / Timing Role: Monitors regulated 3.3V supply, asserts reset if MCU locks during sensor readout, and uses 209s watchdog to catch deep sleep failures. Use Value: Eliminates need for external RC timing networks - reduces size/cost while meeting IEC 62304 software safety requirements. |
| Industrial Handheld Scanners | Low-Power Wireless Sensors |
Use Scenario: Rugged barcode scanner powered by rechargeable Li-ion, operating in variable-temperature warehouses. IC Role / Device Role / Timing Role: Provides 300ms reset hold time after cold-start and detects firmware crashes during motor driver control sequences. Use Value: Ensures consistent boot sequence across -20°C to +60°C ambient - avoids field returns due to intermittent boot failure. |
Use Scenario: LoRaWAN soil moisture node deployed in remote fields, sleeping >99.9% of time on AA batteries. IC Role / Device Role / Timing Role: Acts as primary power supervisor and watchdog for ARM Cortex-M0+, using 209s timeout to verify periodic wake-and-transmit cycles. Use Value: Guarantees recovery from radio stack lockups without increasing average current - extends 10-year battery target. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK33D5S+T | Same 3.3V threshold and 300ms timeout, but 3.3s watchdog (S suffix) instead of 209s (L). | Better suited for short-loop firmware where rapid hang detection is required; less tolerant of long idle periods. | Select when watchdog refresh frequency exceeds 0.3Hz and deterministic fast recovery is prioritized over battery longevity. |
| TPS3836K33DBVR | 3.3V threshold, 200ms timeout, no watchdog; 1.6µA ICC - 9x higher than MAX6865UK33D5L+T. | Lacks watchdog capability; requires external circuitry for hang detection; higher ICC reduces battery life in always-on designs. | Choose only if watchdog is unnecessary and legacy TI design reuse outweighs 170nA advantage and feature set. |
Compared with MAX6865UK33D5L+T, the MAX6864UK33D5S+T trades longer watchdog coverage for faster fault response, while TPS3836K33DBVR sacrifices both ultra-low power and watchdog functionality - making MAX6865UK33D5L+T uniquely balanced for long-life, safety-critical portable systems.
Availability
MAX6865UK33D5L+T is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, and low-power wireless sensors requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK33D5L+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 MAX6854–MAX6869 family delivers nanopower supervision with integrated watchdog for battery-constrained µP systems - engineered specifically for multi-year operation in glucose monitors, wearables, and remote sensors.
FAQ
What is the exact reset threshold voltage of the MAX6865UK33D5L+T?
The MAX6865UK33D5L+T has a factory-trimmed reset threshold of 3.3V with ±2.5% tolerance (3.218V to 3.383V), as defined by the "33" suffix in its part number per Maxim's Threshold Suffix Guide. This value is guaranteed over -40°C to +85°C and ensures reliable reset assertion before most 3.3V microcontrollers lose functional integrity.
Does the MAX6865UK33D5L+T require external components for basic operation?
No, the MAX6865UK33D5L+T requires no external components for core supervision. Its 10kΩ internal MR pullup, precision voltage reference, and self-contained watchdog oscillator eliminate the need for resistors, capacitors, or crystals. Only a 0.1µF VCC bypass capacitor is recommended for noise immunity - not mandatory but strongly advised in noisy environments.
How does the watchdog timer in the MAX6865UK33D5L+T clear and expire?
The MAX6865UK33D5L+T watchdog timer clears on any rising or falling edge at the WDI pin, or when reset is asserted or MR is pulled low. It expires only if WDI remains static (high or low) for ≥209s (typical), triggering a reset pulse lasting ≥300ms. The timer remains inactive while reset is asserted and resumes counting immediately upon reset deassertion.
What is the function of Pin 1 (RESET) on the MAX6865UK33D5L+T?
Pin 1 of the MAX6865UK33D5L+T is the active-high push-pull RESET output. It drives high during reset conditions (VCC < 3.3V, MR low, or watchdog timeout) and low otherwise. Unlike open-drain variants, it sources/sinks current per VOH/VOL specs and requires no external pullup - directly interfacing with µP reset inputs rated for 3.3V logic.
Can the MAX6865UK33D5L+T operate down to 1.2V supply voltage?
Yes, the MAX6865UK33D5L+T is fully specified to operate from VCC = 1.2V to 5.5V. Its reset output remains valid down to VCC = 1.1V, and supply current stays at 170nA typical across this range. This enables use with single-cell alkaline (1.0–1.5V), LiFePO₄ (2.5–3.6V), and regulated 3.3V supplies without derating.
MAX6865UK33D5L+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:
- 3.3V
- 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
MAX6865UK33D5L+T FAQ
1.How can I place an order for MAX6865UK33D5L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK33D5L+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 MAX6865UK33D5L+T reliable?
The price and inventory of MAX6865UK33D5L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK33D5L+T is usually 5 days.
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Once your MAX6865UK33D5L+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 MAX6865UK33D5L+T?
For technical support, including MAX6865UK33D5L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK33D5L+T requirements.
6.How does Aetrix verify that MAX6865UK33D5L+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK33D5L+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 MAX6865UK33D5L+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK33D5L+T?
All MAX6865UK33D5L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK33D5L+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 MAX6865UK33D5L+T part is unused and in its original packaging.
Return procedure for MAX6865UK33D5L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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