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Analog Devices Inc./Maxim Integrated MAX6385XS40D3-T
- Part No.:
- MAX6385XS40D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS40D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,799
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Product details
Overview
MAX6385XS40D3-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.0V reset threshold, 140ms minimum VCC reset timeout, and manual reset input (MR). It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6385XS40D3-T datasheet, MAX6385XS40D3-T pinout, MAX6385XS40D3-T application, or MAX6385XS40D3-T equivalent, key selection criteria include its active-high push-pull output configuration, 4.0V ±2.5% threshold accuracy over –40°C to +125°C, MR debounce capability, SC70-4 package footprint, and compatibility with dual-voltage system monitoring.
Technical Context
The MAX6385XS40D3-T implements a precision voltage comparator with internal 4.0V reference and a monostable timeout timer triggered by VCC falling below threshold or MR assertion. Its active-high push-pull RESET output drives high during fault conditions and deasserts after the 140ms minimum timeout period once VCC recovers above 4.0V or MR is released.
It features an internal 63kΩ pullup on MR, supports TTL/CMOS-compatible manual reset triggering, and maintains guaranteed logic state integrity down to VCC = 1V. The device is AEC-Q100 qualified (automotive version denoted by /V suffix) and immune to negative-going VCC transients up to specified overdrive-duration limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V ±2.5% over –40°C to +125°C - ensures reliable detection of 4.0V rail collapse with minimal temperature drift. |
| VCC Reset Timeout | 140ms (min) - holds RESET high long enough to guarantee full μP initialization after power recovery. |
| Supply Current | 3μA at +1.8V - enables integration into ultra-low-power battery-operated systems without significant quiescent load. |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and provides strong drive capability (800µA source, 3.2mA sink). |
| Manual Reset Input | MR with 63kΩ internal pullup - allows momentary switch-to-GND implementation with no external components required. |
| Operating Voltage Range | +1.0V to +5.5V - supports operation during deep brownout and ensures functional reset assertion even as VCC decays. |
| Reset Output Validity | Guaranteed down to VCC = 1V - prevents metastability or undefined logic states during power-down sequences. |
Pinout & Package
MAX6385XS40D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - powers internal circuitry and serves as reset trigger source. |
| 2 | RESET | Active-high push-pull output - drives high during reset condition; sinks current when low, sources current when high. |
| 3 | MR | Active-low manual reset input - forces reset when pulled low; internally pulled up to VCC via 63kΩ resistor. |
| 4 | GND | Analog and digital ground reference - must be connected to system ground plane for accurate threshold sensing and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.0V threshold | ±2.5% accuracy across –40°C to +125°C eliminates need for external calibration or trimming resistors. |
| 140ms minimum reset timeout | Ensures sufficient hold time for slow-starting processors or peripherals before release of reset signal. |
| Integrated MR pullup | 63kΩ internal resistor enables direct connection of momentary switch to GND - no external BOM items required. |
| Valid output down to VCC = 1V | Prevents floating or indeterminate reset state during deep undervoltage events, improving system robustness. |
| Negative-going transient immunity | Rejects short-duration VCC glitches (e.g., <100ns at 100mV overdrive), reducing false resets in noisy environments. |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable ECG sensor operating from single Li-ion cell with dynamic voltage sag during RF transmission. IC Role / Device Role / Timing Role: Monitors core supply (3.3V) and asserts active-high RESET to halt MCU execution until voltage stabilizes post-transmission. Use Value: Prevents corrupted memory writes or firmware crashes caused by brownout-induced timing violations during wireless bursts. |
Use Scenario: Sub-GHz sensor node powered by coin cell, waking periodically to sample and transmit data. IC Role / Device Role / Timing Role: Provides clean power-on reset and detects battery depletion below 3.0V using 4.0V threshold with margin. Use Value: Enables deterministic wake-up sequence and graceful shutdown before critical undervoltage lockout occurs. |
| Industrial HMI Panels | Dual-Voltage Microcontroller Systems |
Use Scenario: Touchscreen HMI powered from 5V rail with auxiliary 3.3V LDO for logic; subject to line transients. IC Role / Device Role / Timing Role: Supervises 5V main supply and generates active-high reset pulse synchronized to VCC recovery. Use Value: Eliminates need for external RC timing network while providing glitch-immune reset assertion during AC line disturbances. |
Use Scenario: MCU with separate 1.8V core and 3.3V I/O supplies requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V rail; MR input allows software-initiated reset of both domains via single control line. Use Value: Simplifies BOM and layout by replacing dual-supply supervisors with one device plus optional RESET IN variant (e.g., MAX6387). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS40D2-T | 20ms minimum reset timeout vs. 140ms - shorter assertion window. | Suitable for fast-booting MCUs where extended reset hold time is unnecessary. | Select when system startup timing budget is tight and 20ms suffices for initialization. |
| MAX6385XS40D5-T | 280ms minimum reset timeout vs. 140ms - doubles hold duration. | Required for peripherals with longer power-up stabilization (e.g., certain ADCs or flash memories). | Choose when downstream devices demand >140ms reset assertion to ensure readiness. |
Compared with MAX6385XS40D2-T and MAX6385XS40D5-T, the MAX6385XS40D3-T provides a balanced 140ms reset hold time - sufficient for most ARM Cortex-M and RISC-V microcontrollers without over-provisioning delay, optimizing boot speed and reliability in portable and industrial edge devices.
Availability
MAX6385XS40D3-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial HMI panels, and dual-voltage microcontroller systems requiring stable component supply and long-term production continuity.
Supply support for MAX6385XS40D3-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, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy μP supervisory circuits targeting space- and energy-constrained embedded systems requiring guaranteed reset behavior across wide temperature and voltage ranges.
FAQ
What is the reset threshold voltage of the MAX6385XS40D3-T?
The MAX6385XS40D3-T has a factory-set reset threshold of 4.00V with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is laser-trimmed during production and does not require external adjustment. The threshold is referenced to VCC and remains stable under varying load and temperature conditions, ensuring consistent detection of 4.0V rail faults. The MAX6385XS40D3-T uses this fixed threshold to assert RESET whenever VCC falls below 4.00V.
Does the MAX6385XS40D3-T support manual reset functionality?
Yes, the MAX6385XS40D3-T includes a dedicated active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, and RESET remains high for the full 140ms timeout after MR is released. This feature enables hardware-triggered resets via momentary switches or logic signals without external components. The MAX6385XS40D3-T's MR input is TTL/CMOS-compatible and supports debounced operation per datasheet specifications.
What package type is used for the MAX6385XS40D3-T?
The MAX6385XS40D3-T is packaged in a 4-pin SC70 (SOT-323) outline, designated as package code X4+1, with dimensions of 2.0mm × 2.1mm × 0.95mm. This RoHS-compliant, lead-free package features gull-wing leads and is optimized for reflow soldering on high-density PCBs. The MAX6385XS40D3-T's SC70-4 footprint matches industry-standard land pattern 90-0187 and is pin-compatible with other members of the MAX6384–MAX6390 series in the same package variant.
How does the MAX6385XS40D3-T behave during brownout conditions?
During brownout, when VCC drops below 4.00V, the MAX6385XS40D3-T immediately asserts its active-high RESET output. RESET remains high for a minimum of 140ms after VCC rises back above the threshold, ensuring the microprocessor completes power-up initialization. The MAX6385XS40D3-T guarantees valid logic levels on RESET down to VCC = 1V, preventing metastability. Its negative-going transient immunity further suppresses false resets from sub-microsecond supply glitches.
Is the MAX6385XS40D3-T suitable for automotive applications?
The MAX6385XS40D3-T is rated for –40°C to +125°C operation and is AEC-Q100 qualified when ordered with the /V suffix (e.g., MAX6385XS40D3/V+T). The standard MAX6385XS40D3-T lacks automotive qualification documentation and is intended for industrial and commercial use. For automotive deployment, specify the /V variant to ensure compliance with stress testing, failure rate, and traceability requirements. The MAX6385XS40D3-T itself shares identical electrical specs but requires the /V suffix for certified automotive use.
MAX6385XS40D3-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:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS40D3-T FAQ
1.How can I place an order for MAX6385XS40D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS40D3-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 MAX6385XS40D3-T reliable?
The price and inventory of MAX6385XS40D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS40D3-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS40D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS40D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS40D3-T?
MAX6385XS40D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS40D3-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 MAX6385XS40D3-T?
For technical support, including MAX6385XS40D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS40D3-T requirements.
6.How does Aetrix verify that MAX6385XS40D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS40D3-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 MAX6385XS40D3-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS40D3-T?
All MAX6385XS40D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS40D3-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 MAX6385XS40D3-T part is unused and in its original packaging.
Return procedure for MAX6385XS40D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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