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Analog Devices Inc./Maxim Integrated MAX6864UK33D6L+T
- Part No.:
- MAX6864UK33D6L+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK33D6L+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,663
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Product details
Overview
MAX6864UK33D6L+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 3.3V reset threshold (±2.5%), 1200ms minimum reset timeout, manual reset input (MR), and watchdog timer with 209s typical timeout. It monitors VCC in battery-powered medical and portable electronics to ensure reliable µP startup and fault recovery.
For engineers reviewing the MAX6864UK33D6L+T datasheet, MAX6864UK33D6L+T pinout, MAX6864UK33D6L+T application, or MAX6864UK33D6L+T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for low-power supervisory design.
Technical Context
The MAX6864UK33D6L+T integrates voltage monitoring, manual reset assertion, and watchdog timer functionality in a single BiCMOS IC. Its reset output asserts when VCC drops below 3.3V, MR is pulled low, or WDI remains static beyond 209s - with guaranteed reset validity down to VCC = 1.1V and immunity to ≤40µs VCC transients at 100mV overdrive.
It uses an internal 10kΩ pullup on MR and accepts CMOS-level WDI transitions as short as 150ns. The watchdog timer clears on any WDI edge, MR assertion, or active reset - ensuring robust detection of software hangs without requiring external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typ at +25°C - enables multi-year operation on coin-cell batteries in always-on medical monitors. |
| Reset Threshold | 3.3V ±2.5% - precisely matches common 3.3V logic rails; factory-trimmed for no calibration required. |
| Reset Timeout | 600–1200ms min (D6 option) - ensures full µP initialization before release, even after brownout recovery. |
| Watchdog Timeout | 209s typ (L suffix) - supports long-cycle firmware tasks while detecting catastrophic lockups. |
| VCC Operating Range | 1.2V to 5.5V - compatible with Li-ion, alkaline, and regulated 1.8V/2.5V/3.3V/5V systems. |
| Reset Output Type | Push-pull active-low - drives µP reset directly without external pullup; sinks 1.2mA at VCC ≥ 2.38V. |
| MR Input | Active-low with 10kΩ internal pullup - accepts momentary switch or open-drain logic; 1µs min pulse width. |
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-low push-pull reset output; asserts low during VCC undervoltage, MR low, or watchdog timeout - drives µP reset pin directly. |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane with low-impedance path. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 10kΩ; initiates reset when pulled to GND. |
| 4 | WDI | Watchdog input; requires rising/falling edge every <209s to prevent reset; detects pulses ≥150ns wide. |
| 5 | VCC | Supply voltage input and monitored rail; bypass with 0.1µF capacitor to GND for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical supply current enables >10-year battery life in glucose monitors using CR2032 cells. |
| Guaranteed reset validity | RESET remains functional down to VCC = 1.1V - ensures fail-safe reset assertion during deep brownout. |
| No external components | Integrates MR pullup, watchdog timing, and reset delay - eliminates BOM cost and board space for RC networks. |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| Watchdog edge sensitivity | Detects WDI transitions as short as 150ns - supports high-frequency polling without missing watchdog clears. |
Applications
| Glucose Monitors | Patient Monitoring Devices |
|---|---|
Use Scenario: Continuous glucose sensing with Bluetooth LE transmission and low-power sleep cycles. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset on power-up, brownout, or firmware hang detected via WDI. Use Value: Prevents corrupted sensor readings or failed BLE handshakes by guaranteeing µP enters known state before critical ADC or radio initialization. |
Use Scenario: Portable ECG or SpO₂ monitor powered by single AA battery with multi-week runtime. IC Role / Device Role / Timing Role: Voltage supervisor with 3.3V threshold and 1200ms reset timeout coordinating µP, analog front-end, and display controller startup sequence. Use Value: Ensures analog signal chain powers up fully before µP begins sampling - eliminating baseline drift or clipping on first acquisition. |
| Industrial Handheld Scanners | Smart Wearables |
Use Scenario: Rugged barcode scanner with cold-temperature operation (-20°C) and frequent wake-from-sleep events. IC Role / Device Role / Timing Role: Nanopower supervisor monitoring 3.3V rail and asserting reset if VCC dips during motor activation or RF burst. Use Value: Maintains deterministic boot timing across temperature and load transients - preventing bootloader timeouts or corrupted flash writes. |
Use Scenario: Fitness tracker with heart-rate sensor, accelerometer, and BLE SoC running duty-cycled firmware. IC Role / Device Role / Timing Role: Watchdog-enabled supervisor verifying firmware execution integrity between sensor reads and wireless uploads. Use Value: Detects infinite loops in motion-detection algorithms by requiring WDI toggling every <209s - triggering hard reset before battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.3V reset threshold, 200ms timeout, no watchdog timer, 1.2µA ICC. | Lacks watchdog functionality; suitable only where software hang detection is handled externally. | Select when lowest possible BOM count is prioritized and watchdog is implemented in firmware or separate logic. |
| STM6315SW33F6F | 3.3V threshold, 1.6s timeout, 1.5µA ICC, no watchdog, push-pull active-low RESET. | Higher supply current and longer timeout; no WDI input - requires external watchdog or MCU-integrated solution. | Choose for legacy designs already using STM63xx family; verify compatibility with 1200ms timing margin in power-up sequencing. |
Compared with MAX6864UK33D6L+T, TPS3836K33DBVR omits watchdog capability but offers lower procurement complexity, while STM6315SW33F6F trades nanopower efficiency for broader temperature qualification (–40°C to +125°C) and higher drive strength - neither provides direct functional replacement without firmware or layout adaptation.
Availability
MAX6864UK33D6L+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, industrial handheld scanners, and smart wearables requiring stable component supply across extended production lifecycles.
Supply support for MAX6864UK33D6L+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 systems.
The MAX6854–MAX6869 family was engineered specifically for ultra-low-power microprocessor supervision in battery-constrained devices - delivering nanoscale current draw without sacrificing reset accuracy, watchdog reliability, or transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6864UK33D6L+T?
The MAX6864UK33D6L+T has a factory-trimmed reset threshold of 3.3V with ±2.5% tolerance over –40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) and Electrical Characteristics section of the datasheet, where "33" in the part number denotes the 3.3V option. The device guarantees valid reset assertion down to VCC = 1.1V, supporting robust operation during brownout conditions.
Does MAX6864UK33D6L+T include a watchdog timer, and what is its timeout?
Yes, MAX6864UK33D6L+T includes a watchdog timer with "L" suffix indicating 209s typical timeout (95s min, 487s max). The timer expires if the WDI pin remains static (high or low) beyond this period, triggering a reset for the D6-configured 1200ms timeout. The timer clears on any WDI edge, MR assertion, or active reset - ensuring responsive hang detection without false triggers.
What package type and pin configuration does MAX6864UK33D6L+T use?
MAX6864UK33D6L+T uses a 5-pin SOT23-5 package with standard pinout: Pin 1 = RESET (active-low push-pull), Pin 2 = GND, Pin 3 = MR (active-low manual reset), Pin 4 = WDI (watchdog input), Pin 5 = VCC. This configuration is explicitly shown in the "MAX6864/MAX6865/MAX6866 Pin Description" section and "Pin Configurations" diagram on page 15 of the datasheet.
Can MAX6864UK33D6L+T operate from a 1.8V supply?
Yes, MAX6864UK33D6L+T operates from 1.2V to 5.5V, including 1.8V nominal supplies. At VCC = 1.8V, its supply current is 170nA (typ), reset threshold remains 3.3V ±2.5%, and RESET output sinks 500µA with VOL ≤ 0.3V. However, note that the 3.3V threshold is fixed - so it monitors a higher rail (e.g., 3.3V LDO output) while powered from 1.8V, enabling flexible multi-rail supervision.
How does the manual reset (MR) function on MAX6864UK33D6L+T?
The MR pin on MAX6864UK33D6L+T is an active-low input with internal 10kΩ pullup to VCC. Driving MR low initiates a reset that persists for the full 1200ms timeout after MR returns high. It accepts CMOS logic levels and momentary switches; no external debounce is needed. MR pulse width must exceed 1µs, and the pin rejects glitches <200ns - ensuring noise immunity in portable equipment.
MAX6864UK33D6L+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:
- 600ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6864UK33D6L+T FAQ
1.How can I place an order for MAX6864UK33D6L+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK33D6L+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 MAX6864UK33D6L+T reliable?
The price and inventory of MAX6864UK33D6L+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK33D6L+T is usually 5 days.
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Once your MAX6864UK33D6L+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 MAX6864UK33D6L+T?
For technical support, including MAX6864UK33D6L+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK33D6L+T requirements.
6.How does Aetrix verify that MAX6864UK33D6L+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK33D6L+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 MAX6864UK33D6L+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK33D6L+T?
All MAX6864UK33D6L+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK33D6L+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 MAX6864UK33D6L+T part is unused and in its original packaging.
Return procedure for MAX6864UK33D6L+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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