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Analog Devices Inc./Maxim Integrated MAX6385XS42D4-T
- Part No.:
- MAX6385XS42D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS42D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,616
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Product details
Overview
The MAX6385XS42D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit in 4-pin SC70 package, featuring a factory-set reset threshold of +4.20V (±2.5% over -40°C to +125°C), 1120ms minimum VCC reset timeout, and 3μA supply current at +1.8V. It monitors single-supply rails in battery-powered controllers and portable instrumentation where low-power, precise voltage supervision is critical.
For engineers reviewing the MAX6385XS42D4-T datasheet, MAX6385XS42D4-T pinout, MAX6385XS42D4-T application, or MAX6385XS42D4-T equivalent, key selection criteria include its active-high push-pull output, manual reset input with internal 63kΩ pullup, guaranteed reset validity down to VCC = 1V, and automotive-grade AEC-Q100 qualification for industrial embedded systems.
Technical Context
This device implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across -40°C to +125°C, coupled to a monolithic timer generating a fixed 1120ms reset assertion period after VCC recovery. The internal MR pullup resistor (63kΩ) enables direct connection of a momentary switch to GND without external components.
Reset assertion occurs when VCC falls below 4.20V or when the manual reset input (MR) is driven low; the active-high RESET output remains high for the full timeout after either condition clears. The device guarantees correct logic state for VCC ≥ 1V and exhibits immunity to negative-going VCC transients up to 35µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | +4.20V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive temperature range |
| VCC Reset Timeout | 1120ms minimum - provides sufficient hold-off time for processor initialization and power rail stabilization | Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable devices |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct interface to μP reset inputs |
| Manual Reset Input | Internal 63kΩ pullup to VCC - allows simple momentary switch-to-GND implementation with no external components |
| Operating Voltage Range | +1.0V to +5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Reset Output Validity | Valid down to VCC = 1V - ensures deterministic reset behavior during power ramp-down |
Pinout & Package
MAX6385XS42D4-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. Pin 1 is RESET (active-high push-pull), Pin 2 is VCC, Pin 3 is MR (active-low manual reset), and Pin 4 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull output - drives high during reset assertion; sinks/source current per spec; interfaces directly to μP reset pin |
| 2 | VCC | Main supply input and monitored voltage rail - powers internal circuitry and serves as primary reset trigger source |
| 3 | MR | Active-low manual reset input - forces reset when pulled low; internal 63kΩ pullup enables NC or VCC tie-off if unused |
| 4 | GND | Reference ground for all internal comparators and timers - must be connected to system ground plane for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | Fixed +4.20V with ±2.5% tolerance over full temperature range - eliminates external resistor network and calibration effort |
| Guaranteed reset validity at low VCC | Operates correctly down to VCC = 1V - ensures robust reset signaling during undervoltage shutdown sequences |
| Integrated MR pullup | 63kΩ internal resistor to VCC - reduces BOM count and PCB area by removing external pullup requirement |
| Negative transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in electrically noisy environments |
| AEC-Q100 qualified | Qualified for automotive applications per Rev 7 datasheet - supports deployment in under-hood and infotainment systems |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous monitoring of vital signs using coin-cell–powered wearable sensor nodes with strict power budget constraints. IC Role / Device Role / Timing Role: Supervises main 3.3V supply rail and asserts active-high reset to ARM Cortex-M0+ MCU during brownout events. Use Value: 3μA quiescent current extends battery life beyond 5 years; 1120ms timeout ensures full ADC calibration completes before firmware execution resumes. | Use Scenario: Environmental data collection in remote field deployments where replacement batteries are logistically difficult. IC Role / Device Role / Timing Role: Monitors Li-ion battery voltage and triggers controlled shutdown/reset sequence when cell drops below 3.2V. Use Value: +4.20V threshold matches typical LDO dropout margin; active-high output directly drives reset pin of ultra-low-power MSP430FR59xx without level-shifting. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted programmable logic controller modules operating in unregulated 24V DC industrial environments. IC Role / Device Role / Timing Role: Supervises isolated 5V logic supply derived from buck converter; debounced MR input enables field-service reset via front-panel button. Use Value: Internal MR pullup eliminates external resistor; 1120ms timeout accommodates slow-starting isolated DC/DC converters. | Use Scenario: Dashboard cluster electronics requiring ASIL-B compliant power supervision in vehicles with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary reset supervisor for Infineon AURIX TC3xx microcontroller; monitors 5V domain and asserts reset on undervoltage or ignition-cycle transitions. Use Value: AEC-Q100 qualification and ±2.5% threshold accuracy ensure compliance with ISO 26262 requirements; 4-pin SC70 footprint minimizes layout area in space-constrained clusters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | +3.08V reset threshold, 240ms timeout, no MR input, 3-pin SC70 | Lacks manual reset capability and has lower threshold - suitable only for fixed 3.3V systems without field service requirements | Select when cost-sensitive designs require basic reset without MR functionality and operate strictly at 3.3V |
| TPS3808G33DBVR | +3.3V threshold, adjustable timeout (1ms–10s), open-drain output, SOT-23-5 | Requires external pullup; timeout programmable but lacks factory-trimmed precision - better for flexible timing needs than fixed-voltage reliability | Choose when system requires configurable timeout or operates at 3.3V with existing open-drain reset architecture |
Compared with MAX809TRD3-T and TPS3808G33DBVR, the MAX6385XS42D4-T delivers higher reset threshold accuracy, integrated manual reset, and guaranteed operation down to 1V - making it optimal for 5V industrial and automotive applications demanding deterministic brownout response without design compromises.
Availability
MAX6385XS42D4-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS42D4-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, communications, and computing markets.
The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed reset supervision for microprocessor-based systems where supply rail integrity and deterministic startup sequencing are mission-critical.
FAQ
What is the exact reset threshold voltage of the MAX6385XS42D4-T and how stable is it over temperature?
The MAX6385XS42D4-T has a nominal reset threshold of +4.20V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimmed bandgap reference circuitry and is confirmed in the Electrical Characteristics table of the official datasheet. The MAX6385XS42D4-T maintains this precision without requiring external calibration or compensation networks.
Does the MAX6385XS42D4-T support manual reset, and what is the internal pullup resistance value?
Yes, the MAX6385XS42D4-T features an active-low manual reset (MR) input with an internal 63kΩ pullup resistor to VCC. This allows direct connection of a momentary switch between MR and GND without external components. The MR input accepts TTL/CMOS logic levels and remains functional across the full VCC range (1.0V to 5.5V). The MAX6385XS42D4-T's MR pin is fully compatible with standard debounce practices and supports noise immunity via optional 0.1μF capacitor to GND.
What is the reset timeout duration for the MAX6385XS42D4-T, and is it guaranteed minimum or typical?
The MAX6385XS42D4-T provides a guaranteed minimum reset timeout of 1120ms following VCC recovery above the 4.20V threshold. This value is specified in the Reset Timeout Period table under suffix D4 and is production-tested across temperature and process variations. The MAX6385XS42D4-T does not specify a maximum timeout, ensuring safe margin for processor initialization in demanding applications like automotive ECUs and industrial controllers.
Can the MAX6385XS42D4-T operate reliably at very low supply voltages, and what is the lower limit?
Yes, the MAX6385XS42D4-T guarantees correct reset output logic state down to VCC = 1.0V, as explicitly stated in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic behavior during deep brownout and power-down sequences. The MAX6385XS42D4-T continues to assert reset until VCC exceeds 4.20V and sustains the active-high output for the full 1120ms timeout, even as VCC decays toward 1V.
Is the MAX6385XS42D4-T qualified for automotive applications, and what standard does it meet?
Yes, the MAX6385XS42D4-T is AEC-Q100 qualified for automotive applications, as confirmed in the Features section and Ordering Information table of the datasheet. It meets stress testing requirements for Grade 1 (-40°C to +125°C) operation and is suitable for use in body control modules, instrument clusters, and other non-safety-critical automotive subsystems. The MAX6385XS42D4-T carries the "/V" automotive qualification suffix in its full ordering code variants.
MAX6385XS42D4-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:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS42D4-T FAQ
1.How can I place an order for MAX6385XS42D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS42D4-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 MAX6385XS42D4-T reliable?
The price and inventory of MAX6385XS42D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS42D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS42D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS42D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS42D4-T?
MAX6385XS42D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS42D4-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 MAX6385XS42D4-T?
For technical support, including MAX6385XS42D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS42D4-T requirements.
6.How does Aetrix verify that MAX6385XS42D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS42D4-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 MAX6385XS42D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS42D4-T?
All MAX6385XS42D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS42D4-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 MAX6385XS42D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS42D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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