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Analog Devices Inc./Maxim Integrated MAX6385XS39D7-T
- Part No.:
- MAX6385XS39D7-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS39D7-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,496
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Product details
Overview
MAX6385XS39D7-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.90V reset threshold, 1200ms 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 automotive-grade power sequencing and brownout protection.
For engineers reviewing the MAX6385XS39D7-T datasheet, MAX6385XS39D7-T pinout, MAX6385XS39D7-T application, or MAX6385XS39D7-T equivalent, key selection criteria include its 3.90V ±2.5% threshold accuracy over temperature, 1200ms/150ms dual timeout configuration, 4-pin SC70 package, and compatibility with critical μP reset requirements in portable and dual-voltage systems.
Technical Context
The MAX6385XS39D7-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy from -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed minimum 1200ms reset assertion after VCC recovery and a separate 150ms manual reset timeout following MR release.
This device features an internal 63kΩ pullup on the MR pin, accepts TTL/CMOS-compatible logic levels, and maintains correct RESET logic state even as VCC drops to 1V - enabling robust power-up initialization and brownout recovery in low-voltage embedded systems without external support circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.90V (nominal), ±2.5% over -40°C to +125°C - ensures reliable detection of 3.3V rail brownout |
| VCC Reset Timeout | 1200ms (min) - holds μP in reset long enough for full power stabilization post-brownout |
| Manual Reset Timeout | 150ms (min) - provides short, deterministic reset pulse for operator-triggered recovery |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| Operating Voltage Range | +1.0V to +5.5V - supports operation during deep undervoltage conditions and wide-input systems |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup and drives high-impedance μP reset inputs directly |
| MR Input Pullup | 63kΩ internal resistor - allows direct connection of momentary switch to GND without external components |
Pinout & Package
MAX6385XS39D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained PCB layouts in portable and automotive electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - powers internal circuitry and serves as reset comparator reference |
| 2 | RESET | Active-high push-pull output - asserts high during fault condition and remains high for full 1200ms timeout |
| 3 | MR | Active-low manual reset input - forces reset when pulled low; internal 63kΩ pullup enables switch-to-GND interface |
| 4 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.90V with ±2.5% tolerance over full industrial temperature range - eliminates external resistor network and calibration |
| Dual independent timeout periods | 1200ms VCC reset + 150ms manual reset - decouples power-recovery timing from user-initiated reset behavior |
| Low-voltage operation guarantee | Valid RESET output state maintained down to VCC = 1V - ensures deterministic μP initialization during deep brownout |
| Negative-going transient immunity | Immune to sub-10µs VCC glitches below threshold - prevents spurious resets in electrically noisy environments |
| RoHS-compliant 4-pin SC70 | 2.0mm × 2.1mm footprint - enables high-density placement in compact portable and automotive control modules |
Applications
| Automotive Body Control Module | Industrial PLC I/O Card |
|---|---|
Use Scenario: Monitoring 3.3V microcontroller supply in door module under cold-crank battery conditions (-12V to +14V transients). IC Role / Device Role / Timing Role: Active-high push-pull reset supervisor asserting during VCC dip below 3.90V and holding for 1200ms after recovery. Use Value: Prevents firmware corruption during engine start by ensuring MCU remains held in reset until 3.3V rail stabilizes fully. | Use Scenario: Power sequencing for dual-rail FPGA-based I/O controller with 1.2V core and 3.3V I/O supplies. IC Role / Device Role / Timing Role: Monitors 3.3V I/O rail and provides manual reset via front-panel button with 150ms timeout. Use Value: Enables field-serviceable recovery without power cycle while maintaining strict 1200ms power-stabilization window for safe reconfiguration. |
| Portable Medical Sensor Hub | Battery-Powered Smart Meter |
Use Scenario: Supervising ultra-low-power ARM Cortex-M0+ in wearable ECG sensor operating from coin-cell battery. IC Role / Device Role / Timing Role: 3μA quiescent current supervisor with 3.90V threshold detecting end-of-life battery sag. Use Value: Extends usable battery life by >2 years versus higher-current alternatives while guaranteeing clean reset at 3.3V rail collapse. | Use Scenario: Ensuring reliable boot sequence in AMI smart meter exposed to grid voltage sags and lightning-induced transients. IC Role / Device Role / Timing Role: Detects 3.90V brownout on 3.3V logic rail and asserts reset for full 1200ms to allow LDO and RTC recovery. Use Value: Meets IEC 61000-4-11 immunity requirements by rejecting <10µs negative VCC transients that would otherwise corrupt meter firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS39D4-T | Same 3.90V threshold and MR functionality, but 1120ms VCC timeout (vs. 1200ms) | Suitable where slightly shorter power-stabilization window is acceptable | Select for cost-sensitive designs where 80ms timeout reduction does not impact system reliability |
| TPS3123E18DBVR | 3.08V fixed threshold, 200ms timeout, SOT-23-5 package, no MR input | Lacks manual reset and has lower threshold - limited to single-rail 3.0V systems | Choose only if 3.08V detection and absence of MR are acceptable; not drop-in compatible |
Compared with MAX6385XS39D7-T, the MAX6385XS39D4-T offers identical functionality with reduced timeout duration, while the TPS3123E18DBVR lacks manual reset and targets different voltage rails - making the MAX6385XS39D7-T uniquely suited for automotive and industrial applications requiring both precise 3.90V monitoring and field-serviceable reset capability.
Availability
MAX6385XS39D7-T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O cards, portable medical sensor hubs, and battery-powered smart meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS39D7-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 reset circuits optimized for battery-powered, automotive, and space-constrained embedded systems requiring guaranteed reset behavior across extreme temperatures and supply conditions.
FAQ
What is the exact reset threshold voltage of the MAX6385XS39D7-T?
The MAX6385XS39D7-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 confirmed in the Reset Thresholds table of the official datasheet and applies specifically to the "39" suffix in the part number. The MAX6385XS39D7-T uses this fixed threshold to monitor 3.3V supply rails for brownout conditions without external components.
Does the MAX6385XS39D7-T support manual reset functionality?
Yes, the MAX6385XS39D7-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor. Driving MR low forces an immediate reset, which remains asserted for 150ms after MR is released. This feature is explicitly documented in the General Description and Pin Description sections for MAX6385 devices. The MAX6385XS39D7-T leverages this MR input to enable field-serviceable recovery in automotive and industrial applications without requiring external debounce circuitry.
What is the package type and footprint of the MAX6385XS39D7-T?
The MAX6385XS39D7-T is packaged in a 4-pin SC70 (SOT-323) outline with package code X4+1, outline number 21-0098, and land pattern 90-0187. Its dimensions are 2.0mm × 2.1mm × 0.95mm. This RoHS-compliant package is confirmed in the Ordering Information and Package Information sections of the datasheet. The MAX6385XS39D7-T's compact SC70 footprint enables high-density PCB layouts in portable and automotive electronics where board space is constrained.
How does the MAX6385XS39D7-T behave during low VCC conditions?
The MAX6385XS39D7-T guarantees valid RESET output logic state down to VCC = 1V, as specified in the Electrical Characteristics table. Below this level, the internal circuitry may no longer drive the push-pull output reliably. This behavior is critical for brownout recovery in systems where VCC collapses gradually. The MAX6385XS39D7-T maintains deterministic reset assertion during such events, unlike devices that lose output validity near 1.5V - ensuring the connected microprocessor remains safely held in reset until full power restoration.
What are the thermal characteristics of the MAX6385XS39D7-T in its SC70 package?
The MAX6385XS39D7-T in 4-pin SC70 exhibits a junction-to-ambient thermal resistance (θJA) of 322.6°C/W and junction-to-case (θJC) of 115°C/W on a multilayer board, per JEDEC JESD51-7 testing methodology. These values are published in the Package Information section and reflect actual thermal performance under standard PCB layout conditions. Designers using the MAX6385XS39D7-T should apply these figures for junction temperature estimation in ambient environments up to +125°C, especially in sealed automotive enclosures where airflow is restricted.
MAX6385XS39D7-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:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS39D7-T FAQ
1.How can I place an order for MAX6385XS39D7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS39D7-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 MAX6385XS39D7-T reliable?
The price and inventory of MAX6385XS39D7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS39D7-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS39D7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS39D7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS39D7-T?
MAX6385XS39D7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS39D7-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 MAX6385XS39D7-T?
For technical support, including MAX6385XS39D7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS39D7-T requirements.
6.How does Aetrix verify that MAX6385XS39D7-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS39D7-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 MAX6385XS39D7-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS39D7-T?
All MAX6385XS39D7-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS39D7-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 MAX6385XS39D7-T part is unused and in its original packaging.
Return procedure for MAX6385XS39D7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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