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Analog Devices Inc./Maxim Integrated MAX6865UK35D5S+T
- Part No.:
- MAX6865UK35D5S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6865UK35D5S+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,360
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Product details
Overview
MAX6865UK35D5S+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, combining voltage monitoring (3.5V factory-trimmed reset threshold), manual reset input (MR), and watchdog timer (3.3s typical timeout). It asserts an active-high push-pull RESET output during VCC brownout, MR assertion, or watchdog timeout, with guaranteed reset validity down to VCC = +1.1V. Used in battery-powered glucose monitors and portable medical devices requiring ultra-low quiescent current.
For engineers reviewing the MAX6865UK35D5S+T datasheet, MAX6865UK35D5S+T pinout, MAX6865UK35D5S+T application, or MAX6865UK35D5S+T equivalent, key selection criteria include its 170nA typical supply current, 300ms minimum reset timeout (D5 option), S-suffix 3.3s watchdog period, and compatibility with 1.2V–5.5V VCC operation in -40°C to +85°C industrial environments.
Technical Context
The MAX6865UK35D5S+T implements a precision bandgap-based voltage monitor with ±2.5% threshold accuracy over temperature, coupled with a digital watchdog timer that clears on any WDI edge and expires if WDI remains static beyond 3.3s (typ). Its internal 10kΩ MR pullup and glitch rejection (200ns) enable robust manual reset handling without external components.
Reset assertion is synchronized to VCC crossing the 3.5V threshold (VTH = 3.500V, per Table 2 suffix "35"), followed by a fixed 300ms minimum timeout (D5, Table 4), with active-high push-pull output referenced to VCC. The device guarantees valid RESET down to VCC = 1.1V and exhibits immunity to ≤40µs VCC transients at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 5.5V - supports single-cell Li-ion, 3.3V, and 5V systems without level-shifting. |
| Reset Threshold Voltage | 3.500V (±2.5%) - factory-trimmed for precise 3.3V rail supervision with hysteresis of 0.5% VTH. |
| Typical Supply Current | 170nA at VCC = 1.8V - enables multi-year battery life in always-on medical sensors. |
| Reset Timeout Period | 300ms (min) - ensures µP initialization completes before release, per D5 option in Table 4. |
| Watchdog Timeout | 3.3s (typ), S-suffix - provides sufficient margin for firmware loops while detecting hangs. |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup; drives directly into CMOS inputs. |
| VCC Validity Limit | RESET guaranteed valid to VCC = +1.1V - ensures deterministic reset behavior during deep brownout. |
Pinout & Package
Package: 5-pin SOT23-5, lead-free, surface-mount, footprint compatible with industry-standard 5-pin SOT23 layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - asserts high during fault conditions; sinks/source up to 1.2mA. |
| 2 | GND | Ground reference - must be connected to system ground plane for noise immunity and reset accuracy. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (10kΩ); accepts CMOS logic; 1µs min pulse width. |
| 4 | WDI | Watchdog input - edge-sensitive (rising/falling); clears internal timer on transition; 150ns min pulse width. |
| 5 | VCC | Supply and monitored voltage input - requires 0.1µF bypass capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical at 1.8V - reduces battery drain in portable diagnostics and wearables. |
| Factory-trimmed reset threshold | 3.500V ±2.5% - eliminates external resistor networks and calibration overhead. |
| Watchdog timer with edge-clearing | 3.3s timeout (S-suffix), cleared on any WDI edge - prevents false resets from periodic toggling. |
| Guaranteed reset validity | Valid down to VCC = +1.1V - ensures reliable reset assertion even during severe brownout. |
| No external components required | Integrated MR pullup (10kΩ), no timing capacitors - simplifies BOM and PCB layout. |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
|
Use Scenario: Continuous glucose meters operating from coin-cell batteries with infrequent wireless transmission. IC Role / Device Role / Timing Role: Supervises 3.3V analog front-end and BLE SoC power rails; triggers full system reset on brownout or firmware hang. Use Value: 170nA ICC extends battery life beyond 2 years; 3.3s watchdog detects unresponsive sensor firmware before data corruption occurs. |
Use Scenario: Portable ECG/SpO₂ monitors used in home care with low-power MCU and display driver. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and asserts active-high RESET to MCU and display controller simultaneously. Use Value: 300ms D5 timeout ensures stable power-up of analog signal chain before MCU boot; VCC = 1.1V validity prevents spurious resets during battery sag. |
| Handheld Medical Diagnostic Tools | Industrial Portable Data Loggers |
|
Use Scenario: Battery-powered ultrasound probe interfaces requiring deterministic startup and fault recovery. IC Role / Device Role / Timing Role: Provides manual reset via tactile button (MR) and automatic watchdog supervision of DSP firmware execution. Use Value: MR internal 10kΩ pullup eliminates external resistor; 200ns glitch rejection prevents false resets from ESD events on button lines. |
Use Scenario: Ruggedized environmental loggers deployed in remote locations with 10-year battery requirements. IC Role / Device Role / Timing Role: Supervises 3.5V LDO output feeding MCU, ADC, and RF transceiver; uses WDI to verify periodic sensor polling. Use Value: 3.5V threshold matches nominal LDO setpoint; 3.3s watchdog aligns with maximum allowable sensor read interval without compromising power budget. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6864UK35D5S+T | Active-low push-pull RESET output; identical threshold, timeout, and watchdog specs. | Requires inverted reset logic on host MCU; unsuitable where active-high reset is hardwired. | Select when host system design mandates active-low reset assertion and board layout cannot accommodate logic inversion. |
| TPS3837K33DBVR | 3.3V reset threshold, 200ms timeout, no watchdog; 1.6µA ICC (vs. 170nA); SOT23-5 pin-compatible. | Lacks watchdog functionality; higher supply current limits battery lifetime in always-on devices. | Choose only for cost-sensitive, non-watchdog applications where 10× higher ICC is acceptable and 3.3V (not 3.5V) threshold suffices. |
Compared with MAX6865UK35D5S+T, MAX6864UK35D5S+T offers identical supervision performance but inverted reset polarity, while TPS3837K33DBVR trades nanopower operation and watchdog capability for lower unit cost in simpler systems.
Availability
MAX6865UK35D5S+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign monitors, and handheld diagnostic tools requiring stable component supply across extended production lifecycles.
Supply support for MAX6865UK35D5S+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 industrial, medical, and communications applications, emphasizing low-power, high-reliability solutions.
The MAX6854–MAX6869 family delivers nanopower supervisory functions for battery-critical systems, with the MAX6865UK35D5S+T specifically targeting portable medical electronics needing precise 3.5V rail monitoring and watchdog safety.
FAQ
What is the exact reset threshold voltage of the MAX6865UK35D5S+T?
The MAX6865UK35D5S+T has a factory-trimmed reset threshold of 3.500V, with ±2.5% tolerance over the -40°C to +85°C temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "35" corresponds to VTH = 3.500V. The device guarantees reset assertion when VCC falls below this threshold and deassertion after VCC exceeds it plus hysteresis (0.5% of VTH).
Does the MAX6865UK35D5S+T require external components for basic operation?
No, the MAX6865UK35D5S+T operates autonomously with no external components required. It integrates a 10kΩ internal pullup on the MR pin, needs no timing capacitors for reset or watchdog functions, and only requires a 0.1µF bypass capacitor on VCC for noise immunity-per the Typical Operating Circuit. The active-high push-pull RESET output eliminates external pullup resistors.
What is the watchdog timeout behavior of the MAX6865UK35D5S+T?
The MAX6865UK35D5S+T features a watchdog timer with a typical timeout of 3.3s (S-suffix), clearing on any rising or falling edge at the WDI pin. If WDI remains static (high or low) beyond this period, RESET asserts for the configured 300ms timeout (D5). The timer remains disabled until first reset deassertion and does not run during active reset.
How does the MAX6865UK35D5S+T ensure reliable reset during low VCC conditions?
The MAX6865UK35D5S+T guarantees RESET output validity down to VCC = +1.1V, verified across temperature. Its push-pull architecture maintains defined logic levels even as supply drops, preventing floating states that could cause MCU malfunction. This is critical for brownout recovery in battery-powered medical devices where VCC may sag below 1.8V.
Is the MAX6865UK35D5S+T pin-compatible with other devices in the MAX68xx family?
Yes, the MAX6865UK35D5S+T uses the standard 5-pin SOT23-5 package and shares identical pinout with MAX6864/MAX6866 variants (Pin 1: RESET, Pin 2: GND, Pin 3: MR, Pin 4: WDI, Pin 5: VCC). However, RESET polarity differs: MAX6865UK35D5S+T is active-high push-pull, whereas MAX6864 is active-low-requiring schematic review before substitution.
MAX6865UK35D5S+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:
- 3.5V
- 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
MAX6865UK35D5S+T FAQ
1.How can I place an order for MAX6865UK35D5S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6865UK35D5S+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 MAX6865UK35D5S+T reliable?
The price and inventory of MAX6865UK35D5S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6865UK35D5S+T is usually 5 days.
3.What payment methods are accepted for MAX6865UK35D5S+T?
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4.How is shipping managed for MAX6865UK35D5S+T?
MAX6865UK35D5S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6865UK35D5S+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 MAX6865UK35D5S+T?
For technical support, including MAX6865UK35D5S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6865UK35D5S+T requirements.
6.How does Aetrix verify that MAX6865UK35D5S+T is sourced from the original manufacturer or authorized distributors?
All MAX6865UK35D5S+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 MAX6865UK35D5S+T meets industry standards.
7.What is the process for return or replacement of MAX6865UK35D5S+T?
All MAX6865UK35D5S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6865UK35D5S+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 MAX6865UK35D5S+T part is unused and in its original packaging.
Return procedure for MAX6865UK35D5S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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