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Analog Devices Inc./Maxim Integrated MAX6385XS31D3-T
- Part No.:
- MAX6385XS31D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS31D3-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,323
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Product details
Overview
MAX6385XS31D3-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit with factory-set 3.08V reset threshold, 140ms minimum VCC reset timeout, and integrated debounced manual reset input (MR). It monitors single supply voltage (VCC) in battery-powered or space-constrained embedded systems and guarantees valid reset output down to VCC = 1V. Designed for critical microprocessor power-up sequencing in portable instrumentation and industrial controllers.
For engineers reviewing the MAX6385XS31D3-T datasheet, MAX6385XS31D3-T pinout, MAX6385XS31D3-T application, or MAX6385XS31D3-T equivalent, key selection criteria include its 3.08V ±2.5% threshold accuracy over –40°C to +125°C, 3μA supply current at 1.8V, 4-pin SC70 package footprint, and MR input with internal 63kΩ pullup - all verified in Maxim's Rev 7 datasheet (19-1839).
Technical Context
The MAX6385XS31D3-T implements a precision bandgap-based reset comparator with ±2.5% threshold tolerance across temperature, paired with a monotonic RC-based timeout timer. Its active-high push-pull RESET output drives high during fault conditions (VCC < 3.08V or MR low) and remains asserted for ≥140ms after recovery.
It features a dedicated MR input with 1µs minimum pulse width support, 100ns glitch rejection, and guaranteed operation with TTL/CMOS logic levels. The device lacks auxiliary RESET IN functionality and does not support dual-voltage monitoring - confirmed by MAX6385-specific pin mapping and selector guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges. |
| Reset Timeout | 140ms minimum - provides sufficient hold time for microprocessor initialization before release. |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year battery life in always-on sensor nodes and portable equipment. |
| Operating Voltage | 1.0V to 5.5V - supports valid reset assertion down to 1V, critical for ultra-low-voltage SoC power sequencing. |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to μP reset inputs. |
| MR Input | Internal 63kΩ pullup, TTL/CMOS compatible - allows direct connection of momentary switch to GND without external components. |
| Package | 4-pin SC70 (X4+1 outline) - 1.6mm × 1.6mm footprint ideal for compact PCB layouts. |
Pinout & Package
MAX6385XS31D3-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), with 0.65mm pitch and thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - must be decoupled with 0.1μF capacitor near pin for transient immunity. |
| 2 | RESET | Active-high push-pull reset output - drives high during reset assertion; sinks/source current per spec (VOL ≤ 0.3V at 1.2mA, VOH ≥ 0.8×VCC). |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; pulling low forces reset for ≥140ms after release. |
| 4 | GND | Ground reference for all internal circuitry and output drivers - requires low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±2.5% accuracy over full temperature range - eliminates external resistor divider and calibration effort. |
| Guaranteed reset validity | Operates correctly down to VCC = 1V - ensures deterministic reset behavior during deep brownout or Li-ion battery discharge. |
| Integrated MR debounce | No external RC network required - internal timing rejects transients <100ns and supports clean reset initiation via mechanical switch. |
| Negative-going VCC transient immunity | Withstands 10mV/µs glitches up to 35µs duration without false triggering - validated per Typical Operating Characteristics graph toc07. |
| Pb-free SC70 packaging | RoHS-compliant 4-pin SC70 (X4+1) - meets IPC/JEDEC standards for reflow soldering at 260°C peak temperature. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor with ARM Cortex-M0+ MCU requiring reliable power-on reset during cold-start from depleted coin cell. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET until VCC stabilizes above 3.08V and holds for ≥140ms to ensure flash memory readiness. Use Value: 3μA quiescent current extends battery life beyond 5 years; 3.08V threshold matches typical LDO output for analog front-end rails. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 3.3V I/O supply and field-replaceable firmware. IC Role / Device Role / Timing Role: Primary reset supervisor for main controller ASIC, triggered by either brownout or operator-initiated MR button press. Use Value: MR input with internal 63kΩ pullup enables direct switch connection; 140ms timeout satisfies IEC 61131-2 reset timing requirements. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: 12V-to-3.3V powered body control module operating in –40°C to +125°C ambient with AEC-Q100 compliance requirement. IC Role / Device Role / Timing Role: Single-supply reset monitor for microcontroller core voltage, providing fail-safe restart during load-dump transients. Use Value: ±2.5% threshold accuracy over full temperature range prevents spurious resets; SC70 package withstands automotive reflow profiles. | Use Scenario: Revenue-grade electricity meter with dual-supply architecture (3.3V MCU + 1.8V RTC) and tamper-detection circuitry. IC Role / Device Role / Timing Role: Dedicated reset supervisor for main application processor, independent of RTC power domain. Use Value: 1.0V–5.5V operating range accommodates wide-input buck converter output; 4-pin SC70 saves board area in sealed meter housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385LT31D3-T | Same electrical specs but in 6-pin μDFN (L611+1) package - larger footprint, higher thermal resistance (θJA = 477°C/W). | Preferred for thermally demanding environments where SC70 self-heating may affect long-term threshold stability. | Select when board layout allows 2.0mm × 2.0mm μDFN and thermal margin is constrained. |
| TPS3808G30DBVR | TI part with identical 3.0V threshold and 200ms timeout; consumes 1.1μA at 3.3V but lacks MR input - requires external switch interface. | Suitable for cost-sensitive consumer electronics where manual reset is unnecessary and lower IQ is prioritized. | Choose only if MR functionality is omitted from system design and 1.1μA IQ justifies switching from Maxim's ecosystem. |
Compared with MAX6385XS31D3-T, the LT variant offers better thermal performance in high-power-density designs, while the TPS3808G30DBVR reduces supply current by 63% but removes integrated MR - making MAX6385XS31D3-T optimal for space-constrained, MR-dependent embedded systems requiring guaranteed AEC-Q100 compatibility.
Availability
MAX6385XS31D3-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6385XS31D3-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, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for battery longevity, small-footprint deployment, and robust operation in harsh thermal environments - directly addressing needs in portable instrumentation and automotive ECUs.
FAQ
What is the exact reset threshold voltage of MAX6385XS31D3-T and how is it specified?
The MAX6385XS31D3-T has a factory-set nominal reset threshold of 3.08V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is derived from the "31" suffix in the part number, referencing the Reset Thresholds table where "31" corresponds to VTH(min) = 3.00V, VTH(nom) = 3.08V, VTH(max) = 3.15V. The MAX6385XS31D3-T uses this specific trim and is not adjustable.
Does MAX6385XS31D3-T support dual-voltage monitoring like some other members of the MAX6381–MAX6390 family?
No, MAX6385XS31D3-T does not support dual-voltage monitoring. It monitors only the VCC supply rail. Auxiliary RESET IN functionality is exclusive to MAX6387/MAX6388/MAX6389 variants, as confirmed by the Selector Guide and Pin Description tables. The MAX6385XS31D3-T pinout contains only VCC, RESET, MR, and GND - no RESET IN terminal.
What is the function and electrical behavior of the MR pin on MAX6385XS31D3-T?
The MR pin on MAX6385XS31D3-T is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces the RESET output high for the full 140ms timeout period, even if VCC remains stable. The MAX6385XS31D3-T guarantees MR operation with TTL/CMOS logic levels and rejects glitches shorter than 100ns. No external components are needed for basic switch interfacing.
Can MAX6385XS31D3-T operate reliably at VCC = 1.2V, and what happens to the RESET output below that?
Yes, MAX6385XS31D3-T guarantees correct RESET output logic state for VCC ≥ 1.0V, including at 1.2V. Below 1.0V, the internal circuitry cannot maintain defined output behavior - the RESET output may become indeterminate or float. For applications requiring valid reset signaling down to 0V, external pulldown resistors are recommended only for push-pull outputs like those on MAX6385XS31D3-T, though this falls outside guaranteed operation per datasheet specifications.
Is MAX6385XS31D3-T pin-compatible with legacy Maxim reset ICs such as MAX809 or MAX6326?
Yes, MAX6385XS31D3-T is explicitly listed as pin-compatible with MAX809/MAX810/MAX803/MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348, and MAX6711/MAX6712/MAX6713 - per the Features section of the datasheet. This compatibility applies specifically to the 4-pin SC70 package configuration used by MAX6385XS31D3-T, enabling drop-in replacement in existing designs without PCB modification.
MAX6385XS31D3-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:
- 3.08V
- 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
MAX6385XS31D3-T FAQ
1.How can I place an order for MAX6385XS31D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS31D3-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 MAX6385XS31D3-T reliable?
The price and inventory of MAX6385XS31D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS31D3-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS31D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS31D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS31D3-T?
MAX6385XS31D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS31D3-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 MAX6385XS31D3-T?
For technical support, including MAX6385XS31D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS31D3-T requirements.
6.How does Aetrix verify that MAX6385XS31D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS31D3-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 MAX6385XS31D3-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS31D3-T?
All MAX6385XS31D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS31D3-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 MAX6385XS31D3-T part is unused and in its original packaging.
Return procedure for MAX6385XS31D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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