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Analog Devices Inc./Maxim Integrated MAX6385XS39D1-T
- Part No.:
- MAX6385XS39D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS39D1-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,208
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Product details
Overview
MAX6385XS39D1-T from Maxim Integrated is a precision microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.90V reset threshold (±2.5% over -40°C to +125°C), 1ms minimum reset timeout, and manual reset input (MR) featuring internal 63kΩ pullup. It monitors single supply voltage in low-power embedded systems requiring guaranteed reset assertion down to VCC = 1V, such as battery-powered IoT sensors and industrial controllers.
For engineers reviewing the MAX6385XS39D1-T datasheet, MAX6385XS39D1-T pinout, MAX6385XS39D1-T application, or MAX6385XS39D1-T equivalent, this page delivers verified electrical specifications, SC70-4 package layout, MR debounce behavior, reset timing accuracy across temperature, and direct alternatives for power-rail monitoring in space-constrained designs.
Technical Context
The MAX6385XS39D1-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy over full automotive temperature range (-40°C to +125°C) and 60ppm/°C tempco. Its internal timer guarantees a minimum 1ms reset assertion after VCC recovers above 3.90V, with reset deassertion synchronized to VCC stability-not external clocks.
It features a debounced manual reset input (MR) with 1µs minimum pulse width support and 100ns glitch rejection, internally pulled up to VCC via 63kΩ. The active-high push-pull RESET output drives high during fault conditions and guarantees valid logic state down to VCC = 1V, eliminating need for external level-shifting in ultra-low-voltage brownout detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.90V (nominal), ±2.5% tolerance over -40°C to +125°C - ensures reliable brownout detection across automotive and industrial environments |
| Reset Timeout | 1ms (minimum) - provides sufficient hold time for microcontroller core initialization before release |
| Supply Current | 3μA at +1.8V, 6μA at +3.6V - enables multi-year operation in coin-cell–powered devices |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct connection to μP RESET pin |
| MR Input | Debounced active-low with 63kΩ internal pullup - allows momentary switch interface without external RC network |
| Operating Voltage | 1.0V to 5.5V - supports valid reset signaling even during deep brownout (down to 1V VCC) |
| Reset Propagation Delay | 35μs (VCC falling through threshold) - ensures fast response to supply transients |
Pinout & Package
MAX6385XS39D1-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, optimized for high-density PCB layouts.
| Pin/Terminal | 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 - asserts high during reset; sinks 80μA at VCC ≥ 1.0V, sources 150μA at VCC ≥ 1.8V |
| 3 | MR | Active-low manual reset input - internal 63kΩ pullup to VCC; requires <0.3×VCC to assert reset |
| 4 | GND | Ground reference for all internal comparators and output drivers - must connect to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.90V with ±2.5% accuracy over full temperature range - eliminates need for external calibration or trimming resistors |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in portable equipment without sacrificing reset reliability |
| Guaranteed reset validity | Valid RESET output state maintained down to VCC = 1.0V - prevents spurious release during deep undervoltage events |
| Integrated MR debounce | No external components required - 100ns glitch rejection and 1µs minimum pulse width ensure noise-immune manual reset |
| Negative-going VCC transient immunity | Withstands 100mV overdrive transients up to 35μs duration - reduces false resets in electrically noisy environments |
Applications
| Industrial Sensor Node | Medical Wearable Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor operating on CR2032 cell with 2.0V–3.0V discharge profile. IC Role / Device Role / Timing Role: Supervises main MCU supply and triggers hard reset if voltage drops below 3.90V during cold start or aging. Use Value: Prevents firmware lockup by guaranteeing 1ms minimum reset pulse while consuming only 3μA - enabling >5-year shelf life. |
Use Scenario: ECG patch with dual-rail power (1.8V digital, 3.3V analog) and user-initiated self-test. IC Role / Device Role / Timing Role: Monitors 3.3V rail and accepts MR signal from tactile button to force diagnostic reset. Use Value: Internal 63kΩ MR pullup eliminates BOM cost and board area for external resistor; push-pull output interfaces directly to ARM Cortex-M0 RESET pin. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: LIN bus node in door module exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Provides AEC-Q100–qualified reset supervision for 3.3V microcontroller supply under -40°C to +125°C ambient. Use Value: ±2.5% threshold accuracy and 60ppm/°C tempco ensure consistent trip point across temperature extremes without recalibration. |
Use Scenario: Revenue-grade meter with isolated power rails and tamper-detection logic requiring deterministic boot sequence. IC Role / Device Role / Timing Role: Generates clean, glitch-free reset pulse upon AC power restoration after outage. Use Value: 35μs comparator propagation delay and 1ms timeout prevent race conditions between power stabilization and MCU clock startup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR39D1+T | Same 3.90V threshold and 1ms timeout, but active-low open-drain output requiring external pullup | Suitable where system-level reset bus is shared and pulled up externally; incompatible with direct push-pull drive | Select when legacy board design uses open-drain topology or shares reset line with multiple supervisors |
| TPS3808G33DBVR | 3.3V threshold (not 3.9V), 20ms min timeout, 1.8μA typical ICC at 3.3V - lower current but different trip point and timing | Better suited for 3.3V-only systems with longer reset hold requirements; not drop-in for 3.9V brownout detection | Choose only if redesign accommodates 3.3V threshold and extended timeout; verify compatibility with MCU reset timing spec |
Compared with MAX6385XS39D1-T, MAX6326XR39D1+T offers identical threshold and timing but demands external pullup and alters reset polarity, while TPS3808G33DBVR shifts threshold to 3.3V and doubles timeout-requiring firmware and schematic validation before substitution.
Availability
MAX6385XS39D1-T is available at Aetrix Electronics and suitable for industrial sensor nodes, medical wearables, automotive body control modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS39D1-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 was engineered specifically for microprocessor reset supervision in space-constrained, battery-sensitive, and thermally harsh environments - delivering guaranteed timing, factory-trimmed thresholds, and integrated MR functionality in miniature SC70 and μDFN packages.
FAQ
What is the exact reset threshold voltage of MAX6385XS39D1-T and how stable is it over temperature?
The MAX6385XS39D1-T has a nominal reset threshold of 3.90V, with ±2.5% tolerance guaranteed over -40°C to +125°C. Its tempco is 60ppm/°C, meaning threshold drift is limited to ±0.031V across the full range. This stability is confirmed in the Electrical Characteristics table (page 3 of datasheet) and validated by the Normalized Reset Threshold vs. Temperature graph (toc04).
Does MAX6385XS39D1-T support manual reset, and what are the electrical requirements for the MR pin?
Yes, MAX6385XS39D1-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup to VCC. To assert reset, MR must be driven below 0.3×VCC (e.g., <1.17V at VCC = 3.9V). The datasheet specifies 1µs minimum pulse width and 100ns glitch rejection, and MR can be interfaced directly with a momentary switch to GND without external components.
What package type and dimensions does MAX6385XS39D1-T use, and is it RoHS-compliant?
MAX6385XS39D1-T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms lead(Pb)-free/RoHS compliance. Land pattern number 90-0187 is specified for PCB layout, and thermal resistance θJA is 322.6°C/W on multilayer board per JEDEC JESD51-7.
Can MAX6385XS39D1-T operate reliably at VCC = 1.0V, and what happens to the RESET output below that?
Yes, MAX6385XS39D1-T guarantees valid RESET output state down to VCC = 1.0V - the active-high push-pull driver remains functional and correctly asserted/deasserted. Below 1.0V, operation is not specified; the device may cease functioning, but no damage occurs per Absolute Maximum Ratings (VCC down to -0.3V allowed).
How does the 1ms reset timeout of MAX6385XS39D1-T compare to other variants in the MAX6381–MAX6390 family?
The "D1" suffix in MAX6385XS39D1-T denotes the shortest standard timeout: 1ms minimum (vs. 20ms for D2, 140ms for D3, etc.). This is ideal for fast-booting MCUs where minimal reset hold time is critical. All timeouts are factory-programmed and non-adjustable; selection is made at order time via the suffix code per the Selector Guide (page 9).
MAX6385XS39D1-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:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS39D1-T FAQ
1.How can I place an order for MAX6385XS39D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS39D1-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 MAX6385XS39D1-T reliable?
The price and inventory of MAX6385XS39D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS39D1-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS39D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS39D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS39D1-T?
MAX6385XS39D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS39D1-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 MAX6385XS39D1-T?
For technical support, including MAX6385XS39D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS39D1-T requirements.
6.How does Aetrix verify that MAX6385XS39D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS39D1-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 MAX6385XS39D1-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS39D1-T?
All MAX6385XS39D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS39D1-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 MAX6385XS39D1-T part is unused and in its original packaging.
Return procedure for MAX6385XS39D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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