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Analog Devices Inc./Maxim Integrated MAX6385XS44D4-T
- Part No.:
- MAX6385XS44D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS44D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
MAX6385XS44D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.38V reset threshold, 1120ms VCC reset timeout, and manual reset input. 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 MAX6385XS44D4-T datasheet, MAX6385XS44D4-T pinout, MAX6385XS44D4-T application, or MAX6385XS44D4-T equivalent, key selection criteria include its active-high push-pull output configuration, 4.38V ±2.5% threshold accuracy over –40°C to +125°C, 1120ms minimum VCC reset timeout, MR input with internal pullup, and 4-pin SC70 package compatibility with space-constrained embedded systems.
Technical Context
The MAX6385XS44D4-T implements a precision voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and a monolithic timer for fixed 1120ms reset assertion after VCC recovery. Its active-high push-pull RESET output drives high during fault conditions and deasserts cleanly without external pullup.
It features a debounced manual reset input (MR) with internal 63kΩ pullup resistor, supporting TTL/CMOS-compatible logic levels and momentary switch interfacing. The device operates reliably down to VCC = 1V, ensuring deterministic reset behavior during deep brownout events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal, ±2.5% over –40°C to +125°C - ensures accurate detection of 4.5V rail undervoltage before system instability |
| VCC Reset Timeout | 1120ms minimum - holds processor in reset long enough for power stabilization and clock lock in MCU applications |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and reduces BOM count |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during severe brownout down to 1V supply |
| MR Input Pullup | 63kΩ internal - allows direct connection of normally open switch to GND without external components |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6385XS44D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, with 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 output - drives high during reset assertion; sinks 1.2mA at VCC ≥ 2.5V with VOL ≤ 0.3V |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; low pulse ≥1µs forces reset for full timeout period |
| 4 | GND | Ground reference for all internal comparators and output stage - requires low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V with ±2.5% tolerance over full temperature range - eliminates external resistor divider and calibration effort |
| Guaranteed reset validity | RESET output remains logic-valid down to VCC = 1V - prevents spurious release during slow power ramp-down |
| Integrated MR pullup | 63kΩ internal resistor - enables single-switch manual reset without discrete pullup, reducing footprint and assembly cost |
| Negative-going transient immunity | Rejects VCC glitches <1120µs wide when overdrive is <100mV - avoids false resets in noisy power environments |
| Low-power operation | 3μA ICC at +1.8V - extends battery life in always-on monitoring nodes and portable medical devices |
Applications
| Portable Battery-Powered Equipment | Industrial Controllers |
|---|---|
Use Scenario: Coin-cell–powered wireless sensor node operating intermittently for environmental monitoring. IC Role / Device Role / Timing Role: Power supervisor ensuring clean MCU boot and brownout recovery during battery voltage sag. Use Value: 3μA quiescent current extends 10-year battery life; 1120ms timeout prevents premature firmware execution before LDO stabilization. | Use Scenario: PLC I/O module requiring robust reset during 24V DC supply fluctuations. IC Role / Device Role / Timing Role: Primary reset generator tied to 5V logic rail, with MR for field-service forced reboot. Use Value: ±2.5% threshold accuracy maintains timing margin across –40°C to +125°C ambient; MR input enables maintenance-triggered safe restart without power cycle. |
| Automotive Body Electronics | Medical Wearables |
Use Scenario: In-cabin occupancy sensor with CAN interface and low-voltage wake-up capability. IC Role / Device Role / Timing Role: AEC-Q100–qualified supervisor monitoring 3.3V microcontroller supply and enabling cold-cranking resilience. Use Value: Valid operation down to VCC = 1V ensures reset integrity during engine cranking transients; 4-pin SC70 fits tight PCB real estate near SoC. | Use Scenario: ECG patch with ultra-low-power ARM Cortex-M0+ and rechargeable Li-ion battery. IC Role / Device Role / Timing Role: System-level reset controller coordinating power sequencing between analog front-end and digital subsystem. Use Value: Active-high push-pull output directly interfaces with MCU's nRESET pin without level-shifting; 4.38V threshold matches typical 4.5V LDO dropout margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385LT44D4-T | Same electrical specs but in 6-pin μDFN (1.5mm × 1.5mm) instead of 4-pin SC70 - higher thermal resistance (θJA = 477°C/W) | Better suited for high-density layouts where μDFN land pattern is already standardized; less suitable for minimal footprint designs | Select when board layout uses μDFN footprints or requires lower profile (0.55mm height vs. SC70's 0.95mm) |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable), 200ms timeout, 1.6μA ICC at 3.3V - lacks MR input and has different timing granularity | Targeted at simpler 3.3V-only systems without manual reset requirement; not drop-in for 4.38V/1120ms/MR use cases | Choose only if design uses 3.3V rail exclusively and does not require field-service reset or extended timeout |
Compared with MAX6385LT44D4-T, the MAX6385XS44D4-T offers smaller footprint and better thermal performance on standard PCBs, while TPS3808G33DBVR trades flexibility for ultra-low current - neither is pin-compatible, so layout changes are required for substitution.
Availability
MAX6385XS44D4-T is available at Aetrix Electronics and suitable for portable battery-powered equipment, industrial controllers, automotive body electronics, and medical wearables requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS44D4-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 demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor supervisory circuits optimized for battery longevity, wide-temperature operation, and minimal external components in space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6385XS44D4-T?
The MAX6385XS44D4-T has a factory-set nominal reset threshold of 4.38V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "44" corresponds to VTH(nom) = 4.38V, VTH(min) = 4.27V, and VTH(max) = 4.48V. The MAX6385XS44D4-T uses this precise threshold to monitor 4.5V supply rails for brownout conditions.
Does the MAX6385XS44D4-T support manual reset functionality?
Yes, the MAX6385XS44D4-T includes a dedicated active-low manual reset input (MR) on Pin 3. It features an internal 63kΩ pullup resistor to VCC, allowing direct connection of a normally open momentary switch to GND. A low pulse ≥1µs on MR forces reset assertion for the full 1120ms timeout period. This MR function is explicitly documented for MAX6384/MAX6385/MAX6386/MAX6390 variants, confirming its presence in the MAX6385XS44D4-T.
What package type and dimensions does the MAX6385XS44D4-T use?
The MAX6385XS44D4-T is packaged in a lead-free, RoHS-compliant 4-pin SC70 (SOT-323) package with outline number 21-0098 and land pattern 90-0187. Its dimensions are 2.0mm × 2.1mm × 0.95mm, and it has thermal resistance θJA = 322.6°C/W on a multilayer board. This package is distinct from the 6-pin μDFN option used by LT-suffixed variants and is specified in the Ordering Information table for "XS" prefix parts.
What is the reset output configuration of the MAX6385XS44D4-T?
The MAX6385XS44D4-T features an active-high push-pull reset output on Pin 2. Unlike open-drain variants, it does not require an external pullup resistor. When asserted, RESET drives high; when deasserted, it actively pulls low to ensure clean logic transitions. This configuration is confirmed in the General Description and Selector Guide, which assign "push-pull active-high" to MAX6382/MAX6385/MAX6388 - the "XS" prefix and "44" suffix in MAX6385XS44D4-T place it in that group.
How does the MAX6385XS44D4-T behave during severe supply brownout?
The MAX6385XS44D4-T guarantees correct RESET output logic state down to VCC = 1V, ensuring deterministic reset assertion even during deep brownout. Its internal comparators and timer remain functional across the full 1.0V to 5.5V operating range. Below 1V, the device ceases operation, but the push-pull output retains its last valid state until VCC collapses further - a behavior validated in the Electrical Characteristics table under "RESET Output State Guaranteed Valid Down to VCC = 1V".
MAX6385XS44D4-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:
- 4.38V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS44D4-T FAQ
1.How can I place an order for MAX6385XS44D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS44D4-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 MAX6385XS44D4-T reliable?
The price and inventory of MAX6385XS44D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS44D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS44D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS44D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS44D4-T?
MAX6385XS44D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS44D4-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 MAX6385XS44D4-T?
For technical support, including MAX6385XS44D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS44D4-T requirements.
6.How does Aetrix verify that MAX6385XS44D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS44D4-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 MAX6385XS44D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS44D4-T?
All MAX6385XS44D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS44D4-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 MAX6385XS44D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS44D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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