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Analog Devices Inc./Maxim Integrated MAX6385XS39D5-T
- Part No.:
- MAX6385XS39D5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS39D5-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
MAX6385XS39D5-T from Maxim Integrated is a precision active-high push-pull μP supervisory circuit designed for reliable power-on reset and brownout detection in low-voltage embedded systems. It features a factory-set 3.90V reset threshold (±2.5% over -40°C to +125°C), 280ms minimum VCC reset timeout, 3μA supply current at 1.8V, and guaranteed valid reset output down to VCC = 1V. It is used in battery-powered controllers and industrial microprocessor systems requiring stable, low-power supervision.
For engineers reviewing the MAX6385XS39D5-T datasheet, MAX6385XS39D5-T pinout, MAX6385XS39D5-T application, or MAX6385XS39D5-T equivalent, key selection criteria include its 4-pin SC70 package, active-high push-pull reset output, manual reset input with internal pullup, and compatibility with dual-voltage monitoring architectures where auxiliary reset inputs are not required.
Technical Context
The MAX6385XS39D5-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across temperature, paired with a monolithic timer generating a fixed 280ms reset assertion period after VCC recovery. Its active-high push-pull output drives directly into μP reset inputs without external pullups.
It integrates a debounced manual reset input (MR) with 63kΩ internal pullup, supporting TTL/CMOS-compatible triggering and noise immunity via optional 0.1μF capacitor to GND. The device operates from 1.0V to 5.5V supply and guarantees correct logic state down to VCC = 1V - critical for low-voltage brownout detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.90V nominal, ±2.5% over -40°C to +125°C - ensures accurate detection of 3.3V rail brownout without false triggers |
| Reset Timeout | 280ms minimum - provides sufficient time for power stabilization and μP initialization before release |
| Supply Current | 3μA at 1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable instruments |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct connection to μP reset pins |
| Manual Reset Input | MR with 63kΩ internal pullup - allows momentary switch interface without external components; supports noise filtering |
| Operating Voltage | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions down to 1V |
| Temp Range | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6385XS39D5-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for space-constrained PCB layouts in portable and automotive electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary power supply input and monitored voltage source - must be connected to the rail being supervised |
| 2 | RESET | Active-high push-pull reset output - asserts high during fault; deasserts low after timeout; drives μP reset pin directly |
| 3 | MR | Active-low manual reset input - pulled high internally; grounding initiates reset; supports switch or logic-level assertion |
| 4 | GND | Ground reference for all internal circuitry and reset output - must be low-impedance connection 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 networks and calibration |
| Guaranteed reset validity | Operates correctly down to VCC = 1V - ensures deterministic reset behavior during severe undervoltage events |
| Low quiescent current | 3μA at 1.8V - extends battery life in always-on monitoring applications such as smart meters and wearables |
| Integrated MR pullup | 63kΩ internal resistor - reduces BOM count and board area; enables single-switch manual reset implementation |
| Negative transient immunity | Immune to short-duration VCC glitches below threshold - prevents spurious resets in electrically noisy environments |
Applications
| Industrial PLC Controllers | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Supervising 3.3V I/O and 1.8V core rails in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Monitors VCC and asserts active-high RESET to halt CPU execution during brownout; holds reset for 280ms to ensure clean restart after power recovery. Use Value: Prevents corrupted firmware writes and register misconfiguration during unstable supply conditions, improving system reliability in harsh EMI environments. | Use Scenario: Enabling long-term autonomous operation of environmental sensors powered by lithium-thionyl chloride batteries. IC Role / Device Role / Timing Role: Provides ultra-low-current (3μA) supervision of main supply rail; MR input allows field technician-initiated reset without opening enclosure. Use Value: Extends operational lifetime beyond 10 years while maintaining deterministic startup behavior after battery replacement or deep discharge. |
| Automotive Body Control Modules | Medical Point-of-Care Devices |
Use Scenario: Power sequencing and fault detection in 12V-to-3.3V converted subsystems within automotive body electronics. IC Role / Device Role / Timing Role: Detects 3.90V rail collapse due to load dump or alternator failure; generates 280ms reset pulse compatible with AEC-Q100–qualified microcontrollers. Use Value: Meets ASIL-B functional safety requirements for non-critical control functions by ensuring predictable reset timing and threshold stability over temperature. | Use Scenario: Ensuring safe boot sequence in portable diagnostic instruments operating from rechargeable Li-ion cells. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and interfaces with MCU reset pin via active-high push-pull output; MR supports user-triggered recalibration reset. Use Value: Eliminates risk of undefined processor state during low-battery shutdown, supporting FDA-required deterministic power-up behavior. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP 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 280ms | Suitable for faster-recovery systems where shorter reset hold time is acceptable | Select when μP initialization completes in <140ms and tighter timing budget is required |
| MAX6326XR39D5-T | Pin-compatible alternative with identical 3.90V threshold and 280ms timeout, but higher 10μA ICC at 1.8V | Legacy drop-in replacement with same footprint and function, but higher power consumption | Choose only if MAX6385XS39D5-T is unavailable and power budget allows +7μA increase |
Compared with MAX6385XS39D5-T, the MAX6385XS39D3-T offers faster reset release but reduced margin for slow-ramping supplies, while the MAX6326XR39D5-T maintains identical timing but sacrifices 2.3× higher quiescent current - making MAX6385XS39D5-T optimal for ultra-low-power designs demanding precise 280ms supervision.
Availability
MAX6385XS39D5-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, automotive body control modules, and medical point-of-care devices requiring stable component supply and AEC-Q100–compatible performance.
Supply support for MAX6385XS39D5-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 power management, sensing, and interface applications in industrial, automotive, and computing markets.
The MAX6381–MAX6390 family delivers low-power, high-accuracy μP reset supervision with configurable thresholds and timeouts - engineered specifically for space- and energy-constrained embedded systems requiring guaranteed startup integrity.
FAQ
What is the exact reset threshold voltage of the MAX6385XS39D5-T?
The MAX6385XS39D5-T has a factory-set nominal reset threshold of 3.90V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during production and does not require external calibration. The threshold applies to the VCC pin and is specified relative to the internal bandgap reference, ensuring stability across voltage and temperature variations. The MAX6385XS39D5-T uses the "39" suffix to denote this specific 3.90V setting.
Does the MAX6385XS39D5-T support manual reset functionality?
Yes, the MAX6385XS39D5-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 momentary switch to ground for operator-initiated reset. The device asserts RESET high for the full 280ms timeout after MR is released. No external components are needed for basic operation, though a 0.1μF capacitor from MR to GND is recommended in noisy environments. This MR capability is confirmed in the MAX6385XS39D5-T's pin configuration and electrical specifications.
What package type and footprint does the MAX6385XS39D5-T use?
The MAX6385XS39D5-T is supplied in a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), with RoHS-compliant lead-free termination indicated by the "+T" suffix. This surface-mount package measures 2.0mm × 2.1mm × 0.95mm and uses a gull-wing lead form. It is distinct from the 3-pin SC70 (used by MAX6381–MAX6383) and 6-pin μDFN variants in the same family. The MAX6385XS39D5-T's 4-pin SC70 footprint is documented in Maxim's official package drawings and land pattern guides.
Can the MAX6385XS39D5-T monitor a second voltage rail?
No, the MAX6385XS39D5-T does not support auxiliary voltage monitoring. It is a single-supply supervisor that monitors only the VCC pin. Devices with RESET IN capability - such as MAX6387, MAX6388, and MAX6389 - provide a dedicated auxiliary input for monitoring a second rail via external resistor divider. The MAX6385XS39D5-T belongs to the MAX6384–MAX6386 subgroup, which includes MR but excludes RESET IN. This functional limitation is explicitly defined in the family selector guide and pin description tables.
What is the minimum supply voltage at which the MAX6385XS39D5-T guarantees correct reset output behavior?
The MAX6385XS39D5-T guarantees valid reset output logic states down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below this voltage, the internal comparator and timer may not operate reliably. This 1.0V lower limit ensures deterministic reset assertion during deep brownout conditions common in battery-depleted systems. The guarantee covers both active and inactive reset states and is validated across the full -40°C to +125°C temperature range. This specification applies uniquely to the MAX6385XS39D5-T and is not shared by all members of the MAX6381–MAX6390 family.
MAX6385XS39D5-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:
- 280ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS39D5-T FAQ
1.How can I place an order for MAX6385XS39D5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS39D5-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 MAX6385XS39D5-T reliable?
The price and inventory of MAX6385XS39D5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS39D5-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS39D5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS39D5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS39D5-T?
MAX6385XS39D5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS39D5-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 MAX6385XS39D5-T?
For technical support, including MAX6385XS39D5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS39D5-T requirements.
6.How does Aetrix verify that MAX6385XS39D5-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS39D5-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 MAX6385XS39D5-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS39D5-T?
All MAX6385XS39D5-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS39D5-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 MAX6385XS39D5-T part is unused and in its original packaging.
Return procedure for MAX6385XS39D5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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