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Analog Devices Inc./Maxim Integrated MAX6385XS42D2-T
- Part No.:
- MAX6385XS42D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS42D2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,457
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Product details
Overview
MAX6385XS42D2-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit designed to monitor +4.20V supply voltage in embedded systems. It asserts reset when VCC falls below 4.20V (±2.5% over –40°C to +125°C), guarantees valid output down to VCC = 1V, and provides a 20ms minimum reset timeout after power-up recovery. It features a debounced manual reset input (MR) and operates at only 3μA supply current at +1.8V - ideal for battery-powered microcontroller applications requiring reliable brownout protection.
For engineers reviewing the MAX6385XS42D2-T datasheet, MAX6385XS42D2-T pinout, MAX6385XS42D2-T application, or MAX6385XS42D2-T equivalent, key selection criteria include its factory-set 4.20V threshold, 20ms VCC reset timeout, active-high push-pull output logic, MR input compatibility with TTL/CMOS, and guaranteed operation down to 1V VCC - all critical for deterministic reset behavior in portable and industrial control designs.
Technical Context
The MAX6385XS42D2-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a fixed 20ms minimum reset timeout after VCC rises above the 4.20V threshold or after MR release.
It integrates a 63kΩ internal pullup on the MR pin, supports direct connection to momentary switches without external debounce, and ensures reset assertion remains valid during negative-going VCC transients up to 100mV overdrive with sub-10µs immunity per typical characteristics - enabling robust operation in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.20V nominal, ±2.5% over –40°C to +125°C - ensures accurate detection of 4.2V Li-ion battery or 3.3V/5V rail brownout |
| VCC Reset Timeout | 20ms minimum - guarantees sufficient hold time for microcontroller initialization before release |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and drives high-impedance MCU reset inputs directly |
| MR Input | Debounced, internal 63kΩ pullup - allows direct switch-to-GND connection with no external components |
| Operating Voltage | 1.0V to 5.5V - maintains valid reset state even during deep brownout, supporting fail-safe shutdown sequencing |
| Reset Propagation Delay | 35µs max (VCC falling) - ensures fast response to rapid supply collapse |
Pinout & Package
MAX6385XS42D2-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 1.3mm × 1.7mm × 0.9mm, optimized for space-constrained PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - must be connected to the system's main 4.2V supply |
| 2 | RESET | Active-high push-pull output - drives MCU reset pin high during fault; sinks current when deasserted |
| 3 | GND | Ground reference for all internal comparators and output stage - requires low-impedance connection to system ground plane |
| 4 | MR | Active-low manual reset input - pulling low forces immediate reset; internal 63kΩ pullup holds high when unused |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.20V threshold | Eliminates external resistor divider, reducing BOM count and layout area in battery-monitoring circuits |
| 20ms reset timeout | Matches typical ARM Cortex-M boot ROM initialization windows, preventing premature code execution |
| MR input with integrated pullup | Enables single-switch reset implementation - no external resistor required for basic field service functionality |
| Valid operation down to VCC = 1V | Ensures deterministic reset assertion during deep discharge or cascaded LDO failure scenarios |
| 3μA supply current at 1.8V | Extends battery life in always-on wake-on-reset applications such as smart door locks or asset trackers |
Applications
| Portable Battery-Powered Devices | Industrial Microcontroller Systems |
|---|---|
Use Scenario: Monitoring 4.2V Li-ion battery voltage in handheld medical instruments to prevent data corruption during low-battery shutdown. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to halt MCU operation before brownout-induced memory corruption occurs. Use Value: Factory-set 4.20V threshold aligns precisely with Li-ion end-of-discharge voltage, eliminating calibration overhead and ensuring consistent shutdown behavior across production units. | Use Scenario: Providing deterministic power-on reset for an ARM-based PLC controller operating from a 5V rail with variable load transients. IC Role / Device Role / Timing Role: Active-high push-pull reset generator guaranteeing >20ms reset pulse width regardless of VCC ramp rate or noise. Use Value: 3μA quiescent current minimizes standby power draw, while MR input enables field-service firmware reload via front-panel button without modifying PCB layout. |
| Automotive Body Control Modules | Dual-Rail Embedded Systems |
Use Scenario: Ensuring safe startup sequence in automotive infotainment head units powered by both 12V and 5V supplies. IC Role / Device Role / Timing Role: Primary VCC supervisor for the 5V domain, coordinating with secondary monitoring circuits to delay MCU enable until all rails stabilize. Use Value: AEC-Q100 qualified variant availability (with /V suffix) supports automotive qualification requirements without redesigning the reset architecture. | Use Scenario: Coordinating power sequencing between 3.3V I/O and 1.2V core rails in FPGA-based test equipment. IC Role / Device Role / Timing Role: Standalone reset generator for the 3.3V domain, with MR input synchronized to core-rail OK signal via logic gate. Use Value: Valid reset output down to VCC = 1V prevents spurious resets during slow-ramp power-up sequences common in multi-stage DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS42D3-T | Same 4.20V threshold but 140ms VCC reset timeout instead of 20ms | Suitable for systems requiring longer reset hold time, e.g., complex FPGA configuration or bootloader validation | Select when extended reset duration is needed; not drop-in due to timeout mismatch |
| TLV803EB42DBZR | 4.2V threshold, 20ms timeout, active-high open-drain output (requires external pullup) | Compatible where board already includes pullup resistor; lower cost but higher effective quiescent current | Choose for cost-sensitive designs with existing pullup infrastructure; verify MR compatibility and timing margins |
Compared with MAX6385XS42D2-T, the MAX6385XS42D3-T extends reset hold time for complex initialization, while TLV803EB42DBZR trades push-pull simplicity for open-drain flexibility and slightly higher system-level current draw - both require layout or timing review before substitution.
Availability
MAX6385XS42D2-T is available at Aetrix Electronics and suitable for portable battery-powered devices, industrial microcontroller systems, automotive body control modules, and dual-rail embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6385XS42D2-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 management, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits targeting space- and energy-constrained microcontroller systems requiring guaranteed reset behavior across wide temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX6385XS42D2-T?
The MAX6385XS42D2-T has a factory-set nominal reset threshold of 4.20V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The MAX6385XS42D2-T datasheet specifies min/max limits of 4.10V to 4.31V at +25°C and 4.00V to 4.20V over temperature - making it ideal for precise 4.2V Li-ion battery monitoring applications.
Does the MAX6385XS42D2-T support manual reset functionality?
Yes, the MAX6385XS42D2-T includes a debounced manual reset input (MR) pin with an internal 63kΩ pullup resistor. Driving MR low forces an immediate active-high reset assertion, which remains active for the full 20ms timeout period after MR is released. The MAX6385XS42D2-T MR input accepts standard TTL/CMOS logic levels and can be driven directly by a momentary switch to GND - no external components are required for basic manual reset implementation.
What package type and dimensions does the MAX6385XS42D2-T use?
The MAX6385XS42D2-T is supplied in a lead-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098), measuring 1.3mm × 1.7mm × 0.9mm. Its land pattern (90-0187) is optimized for high-density PCB layouts. This compact footprint supports automated assembly and thermal performance characterized at θJA = 322.6°C/W on multilayer boards - making the MAX6385XS42D2-T well-suited for wearable electronics and miniaturized industrial sensors.
Can the MAX6385XS42D2-T operate reliably at very low supply voltages?
Yes, the MAX6385XS42D2-T guarantees correct reset output logic state down to VCC = 1.0V, as confirmed in its Absolute Maximum Ratings and Electrical Characteristics tables. This capability ensures deterministic behavior during deep brownout conditions, such as battery depletion or cascaded regulator failure. Unlike many supervisors that lose output validity below 1.8V, the MAX6385XS42D2-T maintains functional reset assertion - a critical feature for fail-safe shutdown in safety-critical embedded systems.
Is the MAX6385XS42D2-T pin-compatible with older Maxim reset ICs like the MAX809?
Yes, the MAX6385XS42D2-T is explicitly listed in the datasheet as pin-compatible with MAX809/MAX810/MAX803 and other legacy Maxim supervisors. Its 4-pin SC70 pinout (VCC, RESET, GND, MR) matches the functional mapping of those devices, enabling drop-in replacement in existing designs - provided the active-high push-pull output logic and 4.20V threshold meet system requirements. No PCB changes are required for migration from compatible variants.
MAX6385XS42D2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS42D2-T FAQ
1.How can I place an order for MAX6385XS42D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS42D2-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 MAX6385XS42D2-T reliable?
The price and inventory of MAX6385XS42D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS42D2-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS42D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS42D2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS42D2-T?
MAX6385XS42D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS42D2-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 MAX6385XS42D2-T?
For technical support, including MAX6385XS42D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS42D2-T requirements.
6.How does Aetrix verify that MAX6385XS42D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS42D2-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 MAX6385XS42D2-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS42D2-T?
All MAX6385XS42D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS42D2-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 MAX6385XS42D2-T part is unused and in its original packaging.
Return procedure for MAX6385XS42D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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