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Analog Devices Inc./Maxim Integrated MAX6385XS39D4-T
- Part No.:
- MAX6385XS39D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS39D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,701
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Product details
Overview
MAX6385XS39D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.90V 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, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for use in battery-powered industrial controllers.
For engineers reviewing the MAX6385XS39D4-T datasheet, MAX6385XS39D4-T pinout, MAX6385XS39D4-T application, or MAX6385XS39D4-T equivalent, key selection criteria include its active-high push-pull reset output, 3.90V ±2.5% threshold accuracy over temperature, 1120ms minimum VCC timeout, MR input with internal 63kΩ pullup, and 4-pin SC70 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6385XS39D4-T implements a precision voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco, paired with a monolithic timer that enforces a guaranteed minimum 1120ms reset assertion after VCC recovery. Its MR input features 1µs minimum pulse width support and 100ns glitch rejection.
This device uses BiCMOS process technology to achieve ultra-low quiescent current (3μA at +1.8V) while maintaining robust negative-going VCC transient immunity-rejecting transients up to 150µs wide when overdrive is ≤100mV below threshold-and ensures reset state validity down to VCC = 1V without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.90V (factory-set, ±2.5% over –40°C to +125°C) |
| VCC Reset Timeout | 1120ms min (guaranteed minimum assertion time after VCC rises above threshold) |
| Reset Output Type | Active-high push-pull (drives high during reset; no external pullup required) |
| Supply Current | 3μA at +1.8V (enables multi-year operation in coin-cell–powered systems) |
| Operating Voltage Range | +1.0V to +5.5V (ensures functional reset assertion even during deep brownout) |
| Manual Reset Input | MR with 63kΩ internal pullup (supports direct switch-to-GND connection; no external resistor needed) |
| Temperature Range | –40°C to +125°C (AEC-Q100 qualified for automotive under-hood and industrial control environments) |
Pinout & Package
MAX6385XS39D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.6mm × 0.95mm, optimized for high-density PCB layouts in portable and automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary power supply input and monitored voltage rail; accepts +1.0V to +5.5V |
| 2 | RESET | Active-high push-pull reset output; drives high during reset condition and low otherwise |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 63kΩ resistor |
| 4 | GND | Analog/digital ground reference; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.90V with ±2.5% tolerance over full temperature range eliminates external resistor network |
| Guaranteed reset validity | RESET output remains logic-valid down to VCC = 1V-no external pulldown required for active-high push-pull |
| Low-power supervision | 3μA supply current at +1.8V enables >10-year battery life in always-on IoT sensor nodes |
| Transient-immune comparator | Rejects VCC glitches ≤150µs wide at 100mV overdrive-reduces false resets in noisy power environments |
| Integrated MR pullup | 63kΩ internal resistor allows direct momentary switch connection without BOM additions or layout overhead |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 3.3V I/O rail and 5V MCU core supply in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Supervisory circuit providing deterministic 1120ms reset hold-off after cold start or brownout recovery to ensure FPGA configuration completes before CPU execution begins. Use Value: Prevents firmware corruption by guaranteeing reset remains asserted until all voltage rails stabilize and clock domains lock-critical for SIL-2 compliant control systems. | Use Scenario: Embedded in door module ECUs to supervise 12V-to-3.3V DC-DC converter output powering CAN transceivers and microcontrollers. IC Role / Device Role / Timing Role: Active-high push-pull reset generator triggered by 3.90V threshold violation, with MR input enabling service-mode reset via diagnostic tool. Use Value: Enables fail-safe reinitialization during vehicle wake-up sequences while meeting AEC-Q100 Grade 1 requirements for under-hood thermal cycling. |
| Portable Medical Monitor | Battery-Powered Data Logger |
Use Scenario: Powers clinical-grade ECG monitor using single Li-ion cell (2.7V–4.2V) with LDO-regulated 3.3V system rail. IC Role / Device Role / Timing Role: Resets ARM Cortex-M4 when battery voltage drops below 3.90V-preventing data loss during low-battery shutdown. Use Value: Ultra-low 3μA quiescent current extends operational runtime between charges without compromising reset reliability at end-of-discharge. | Use Scenario: Supervises 3.3V supply in environmental sensor node powered by CR2032 coin cell (nominal 3.0V, aging to 2.0V). IC Role / Device Role / Timing Role: Detects undervoltage on regulated rail and asserts active-high RESET to halt ADC sampling and EEPROM writes before data corruption occurs. Use Value: Factory-set 3.90V threshold provides margin against LDO dropout while 1120ms timeout ensures complete flash write completion before power collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS39D3-T | Same 3.90V threshold and active-high push-pull output, but 140ms reset timeout instead of 1120ms | Suitable for fast-recovery systems where shorter reset hold-off is acceptable (e.g., consumer wearables) | Select when faster system restart is prioritized over extended stabilization time after brownout |
| TPS3808G39DBVR | 3.9V threshold, active-high open-drain output (requires external pullup), 1200ms timeout, 1.8V–6.0V VCC range | Used in TI-based designs requiring SOT-23-5 footprint; lacks integrated MR pullup | Choose when board already includes pullup resistors and design leverages TI ecosystem tools |
Compared with MAX6385XS39D3-T, the MAX6385XS39D4-T provides significantly longer reset assertion (1120ms vs. 140ms) for reliable initialization of complex peripherals; versus TPS3808G39DBVR, it eliminates external pullup dependency and reduces component count in space-constrained layouts.
Availability
MAX6385XS39D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical monitors, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6385XS39D4-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-supply microprocessor supervisory circuits optimized for ultra-low quiescent current, tight threshold accuracy, and robust operation in harsh thermal and electrical environments.
FAQ
What is the exact reset threshold voltage of the MAX6385XS39D4-T?
The MAX6385XS39D4-T has a factory-set reset threshold of 3.90V, specified with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "39" corresponds to nominal 3.90V (min 3.80V, max 4.00V at +25°C). The MAX6385XS39D4-T maintains this precision without external calibration components.
Does the MAX6385XS39D4-T require an external pullup resistor on the RESET pin?
No, the MAX6385XS39D4-T does not require an external pullup resistor on the RESET pin because it features an active-high push-pull output architecture. The internal driver actively pulls the RESET line high during assertion and low during deassertion. This eliminates the need for external components and simplifies layout-unlike open-drain alternatives such as the MAX6383 series, which mandate external pullups.
What is the function of the MR pin on the MAX6385XS39D4-T?
The MR (Manual Reset) pin on the MAX6385XS39D4-T is an active-low input that forces a reset when pulled to GND. It includes a built-in 63kΩ pullup resistor to VCC, allowing direct connection of a momentary switch between MR and GND without additional components. When asserted, the MAX6385XS39D4-T holds RESET high for the full 1120ms timeout period after MR is released, ensuring deterministic system restart.
Can the MAX6385XS39D4-T operate reliably at VCC = 1.0V?
Yes, the MAX6385XS39D4-T guarantees correct RESET output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures valid reset signaling during deep brownout conditions-critical for preserving memory integrity and preventing erratic MCU behavior-even when input voltage collapses near the lower limit of its 1.0V–5.5V operating range.
Is the MAX6385XS39D4-T qualified for automotive applications?
Yes, the MAX6385XS39D4-T is AEC-Q100 qualified for automotive use, as explicitly noted in the Features section and Ordering Information. It meets Grade 1 temperature requirements (–40°C to +125°C) and is offered in RoHS-compliant packages. While the specific /V automotive variant uses suffix "/V+T", the standard MAX6385XS39D4-T shares identical die and qualification-making it suitable for non-safety-critical automotive subsystems like infotainment and body electronics.
MAX6385XS39D4-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:
- 3.9V
- 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
MAX6385XS39D4-T FAQ
1.How can I place an order for MAX6385XS39D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS39D4-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 MAX6385XS39D4-T reliable?
The price and inventory of MAX6385XS39D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS39D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS39D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS39D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS39D4-T?
MAX6385XS39D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS39D4-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 MAX6385XS39D4-T?
For technical support, including MAX6385XS39D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS39D4-T requirements.
6.How does Aetrix verify that MAX6385XS39D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS39D4-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 MAX6385XS39D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS39D4-T?
All MAX6385XS39D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS39D4-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 MAX6385XS39D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS39D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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