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Analog Devices Inc./Maxim Integrated MAX6864UK41D3S+T
- Part No.:
- MAX6864UK41D3S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6864UK41D3S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,140
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Product details
Overview
The MAX6864UK41D3S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (reset threshold = 4.100V), manual reset input (MR), and watchdog timer (timeout = 3.3s typ) with ultra-low 170nA typical supply current. It asserts an active-low push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout-ensuring reliable startup and fault recovery in battery-powered medical and portable electronics.
For engineers reviewing the MAX6864UK41D3S+T datasheet, MAX6864UK41D3S+T pinout, MAX6864UK41D3S+T application, or MAX6864UK41D3S+T equivalent, key selection criteria include its 4.100V factory-trimmed reset threshold, 150ms minimum reset timeout, 3.3s watchdog period, guaranteed RESET validity down to VCC = +1.1V, and immunity to short VCC transients ≤40µs at 100mV overdrive.
Technical Context
This device integrates a precision bandgap-based voltage monitor, a monostable watchdog timer triggered by WDI edge transitions, and a manual reset latch-all operating from 1.2V to 5.5V supply. Its internal 10kΩ MR pullup and glitch rejection (200ns) eliminate external components for basic reset functionality.
The watchdog timer clears on any rising or falling edge at WDI and expires only if WDI remains static beyond 3.3s (typ); reset assertion persists for 150ms (min) after VCC recovery, MR deassertion, or watchdog expiration-enabling robust code-execution supervision without software overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.100V ±2.5% - precisely monitors 4.1V rails; valid down to VCC = 1.1V |
| Supply Current | 170nA (typ) at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout | 150ms (min) - ensures µP initialization completes before release |
| Watchdog Timeout | 3.3s (typ) - balances supervision responsiveness and software execution margin |
| Output Type | Push-pull active-low RESET - drives directly into µP reset pin; no external pullup needed |
| MR Input | Active-low with 10kΩ internal pullup - supports momentary switch or CMOS logic interface |
| VCC Range | 1.2V to 5.5V - compatible with 1.8V, 3.3V, and 5V systems |
Pinout & Package
Package: 5-pin SOT23-5 (2.9mm × 1.6mm × 1.1mm), lead-free, RoHS-compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks ≥500µA at VCC ≥2.38V; valid to VCC = 1.1V |
| 2 | GND | Ground reference for all internal circuits; must connect to system ground plane |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (10kΩ); accepts CMOS levels |
| 4 | WDI | Watchdog input; detects edges ≥150ns wide; timer resets on each transition |
| 5 | VCC | Supply voltage input; 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 glucose monitors |
| Factory-trimmed VTH | 4.100V threshold with ±2.5% tolerance eliminates external resistor networks |
| No external components | Integrated MR pullup, precise timing, and reset hysteresis reduce BOM count by 3–5 parts |
| Transient immunity | Immune to VCC glitches ≤40µs at 100mV overdrive-prevents spurious resets in noisy environments |
| Guaranteed RESET validity | RESET remains functional down to VCC = +1.1V-ensures reset integrity during deep brownout |
Applications
| Glucose Monitors | Patient Monitors |
|---|---|
Use Scenario: Continuous blood glucose sensing in handheld meters with single CR2032 battery. IC Role / Device Role / Timing Role: Supervises 3.3V rail and µP firmware execution via WDI; asserts RESET on power-up, brownout, or software hang. Use Value: 170nA ICC extends battery life beyond 2 years; 4.100V threshold matches LDO output tolerance; 3.3s watchdog prevents missed calibration cycles. |
Use Scenario: Portable ECG/SpO₂ units requiring FDA-grade reliability and low-power operation. IC Role / Device Role / Timing Role: Monitors main 5V supply and triggers hard reset if µP fails to service WDI within 3.3s. Use Value: Guaranteed RESET validity to VCC = 1.1V ensures fail-safe shutdown during battery depletion; 150ms timeout satisfies IEC 60601-1 reset timing requirements. |
| MP3 Players | Cell Phones (Feature) |
Use Scenario: Flash-based audio players with intermittent USB charging and deep sleep modes. IC Role / Device Role / Timing Role: Provides clean power-on reset and detects firmware lockups during codec initialization. Use Value: 5-pin SOT23 footprint minimizes PCB area; MR input enables hardware reset button; open-drain option (not used here) allows level-shifting to 1.8V µP cores. |
Use Scenario: Entry-level GSM handsets using 3.6V Li-ion battery and ARM7-based baseband processor. IC Role / Device Role / Timing Role: Supervises 3.3V PMIC output and watches µP activity during call setup and SMS processing. Use Value: Immunity to 40µs VCC transients prevents false resets during RF transmit bursts; 10kΩ MR pullup simplifies front-panel button interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6865UK41D3S+T | Active-high push-pull RESET output instead of active-low | Requires µP with active-high reset input; incompatible with standard active-low reset pins | Select when host µP reset pin is active-high and board layout cannot accommodate inversion |
| TPS3836K33DBVR | Fixed 3.3V reset threshold; no watchdog timer; 2.5µA ICC (15× higher) | Lacks code-execution supervision; suited only for basic power-monitoring, not safety-critical firmware recovery | Choose only if watchdog functionality is unnecessary and 3.3V rail monitoring suffices |
Compared with MAX6864UK41D3S+T, MAX6865UK41D3S+T offers identical timing and thresholds but inverted RESET polarity-requiring µP compatibility verification-while TPS3836K33DBVR omits watchdog capability and draws significantly more current, limiting battery lifetime in portable medical devices.
Availability
MAX6864UK41D3S+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, MP3 players, and feature cell phones requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX6864UK41D3S+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 portable applications.
The MAX6864UK41D3S+T belongs to the nanopower µP supervisory family, engineered specifically for ultra-low-power battery-operated systems where extended runtime and reliable firmware supervision are critical.
FAQ
What is the exact reset threshold voltage of the MAX6864UK41D3S+T?
The MAX6864UK41D3S+T has a factory-trimmed reset threshold of 4.100V with ±2.5% tolerance across -40°C to +85°C. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "41" corresponds to 4.100V nominal. The device guarantees valid RESET operation down to VCC = +1.1V, making it suitable for brownout detection in systems with tight supply margins.
Does the MAX6864UK41D3S+T include a watchdog timer, and what is its timeout period?
Yes, the MAX6864UK41D3S+T includes a watchdog timer with a typical timeout period of 3.3 seconds, indicated by the "S" suffix in the part number. The timer resets on any rising or falling edge at the WDI pin and expires only if WDI remains static beyond this period. It is designed to detect firmware hangs in µP-based systems without requiring software polling or complex configuration.
What is the reset timeout duration for the MAX6864UK41D3S+T, and how is it set?
The MAX6864UK41D3S+T has a fixed minimum reset timeout period of 150ms, denoted by the "D3" suffix. This value is factory-set and non-adjustable-unlike the MAX6861–MAX6863 series, which use the CT pin for selection. The 150ms duration ensures sufficient time for µP power stabilization and internal register initialization before release.
What type of reset output does the MAX6864UK41D3S+T provide, and how is it configured?
The MAX6864UK41D3S+T provides an active-low push-pull RESET output (pin 1), eliminating the need for an external pullup resistor. This configuration directly drives standard µP reset inputs that require an active-low signal. The output sinks ≥500µA at VCC ≥2.38V and remains valid down to VCC = +1.1V, ensuring robust reset assertion even during deep brownout conditions.
Is the MAX6864UK41D3S+T compatible with 1.8V or 2.5V supply rails?
Yes, the MAX6864UK41D3S+T operates across a VCC range of 1.2V to 5.5V and maintains full functionality-including 170nA supply current, 4.100V threshold accuracy, and 3.3s watchdog timing-at 1.8V and 2.5V. Electrical characteristics tables confirm performance at these voltages, and the device's guaranteed RESET validity to VCC = +1.1V ensures compatibility with low-voltage µPs in deep-sleep states.
MAX6864UK41D3S+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:
- 4.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6864UK41D3S+T FAQ
1.How can I place an order for MAX6864UK41D3S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6864UK41D3S+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 MAX6864UK41D3S+T reliable?
The price and inventory of MAX6864UK41D3S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6864UK41D3S+T is usually 5 days.
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MAX6864UK41D3S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6864UK41D3S+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 MAX6864UK41D3S+T?
For technical support, including MAX6864UK41D3S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6864UK41D3S+T requirements.
6.How does Aetrix verify that MAX6864UK41D3S+T is sourced from the original manufacturer or authorized distributors?
All MAX6864UK41D3S+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 MAX6864UK41D3S+T meets industry standards.
7.What is the process for return or replacement of MAX6864UK41D3S+T?
All MAX6864UK41D3S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6864UK41D3S+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 MAX6864UK41D3S+T part is unused and in its original packaging.
Return procedure for MAX6864UK41D3S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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