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Analog Devices Inc./Maxim Integrated MAX6385XS31D7-T
- Part No.:
- MAX6385XS31D7-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS31D7-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,101
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Product details
Overview
MAX6385XS31D7-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 3.08V 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 battery-powered industrial controllers.
For engineers reviewing the MAX6385XS31D7-T datasheet, MAX6385XS31D7-T pinout, MAX6385XS31D7-T application, or MAX6385XS31D7-T equivalent, key selection criteria include its active-high push-pull reset output, 3.08V ±2.5% threshold accuracy over temperature, 1200ms minimum VCC timeout, integrated MR pullup (63kΩ), and 4-pin SC70 package compatibility with space-constrained embedded systems.
Technical Context
The MAX6385XS31D7-T implements a precision voltage comparator with internal 1.27V reference for threshold detection and a monostable timer for reset assertion timing. Its reset logic asserts high when VCC falls below 3.08V or MR is pulled low, holding the output high for ≥1200ms after VCC recovery or MR release.
It features a dedicated manual reset input with internal 63kΩ pullup resistor, supports operation down to VCC = 1V with guaranteed output state validity, and provides negative-going VCC transient immunity up to 150µs for 100mV overdrive - critical for noisy power environments in portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| VCC Reset Timeout | 1200ms minimum - guarantees sufficient μP initialization time after power recovery |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| Output Type | Active-high push-pull - drives reset line directly without external pullup, simplifying BOM |
| MR Pullup Resistance | 63kΩ internal - allows direct connection of momentary switch to GND without external components |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion even during deep brownout conditions |
| Reset Output Validity | Guaranteed down to VCC = 1V - prevents spurious resets during power ramp-down |
Pinout & Package
MAX6385XS31D7-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 high-density PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - powers device and serves as reset threshold reference point |
| 2 | RESET | Active-high push-pull output - drives μP reset pin high during fault; sinks current when deasserted |
| 3 | MR | Active-low manual reset input - initiates reset on logic-low pulse; internally pulled up to VCC |
| 4 | GND | Analog/digital ground reference - must be connected to system ground plane for stable comparator operation |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±2.5% tolerance over full temperature range - eliminates need for external resistor divider calibration |
| Guaranteed reset validity at low VCC | Operates correctly down to VCC = 1V - ensures deterministic reset behavior during deep undervoltage events |
| Integrated MR pullup | 63kΩ internal resistor - enables single-switch manual reset implementation without discrete components |
| Negative-going transient immunity | Rejects VCC glitches ≤150µs wide at 100mV overdrive - improves robustness in electrically noisy environments |
| Low-power design | 3μA supply current at +1.8V - extends battery runtime in always-on sensor nodes and portable instruments |
Applications
| Power Monitoring in Portable Instruments | Industrial Controller Brownout Protection |
|---|---|
Use Scenario: Handheld multimeter powered by two AA batteries experiencing gradual discharge and intermittent load spikes. IC Role / Device Role / Timing Role: Supervises main supply rail and asserts active-high reset to halt MCU execution when voltage drops below 3.08V. Use Value: Prevents corrupted EEPROM writes and erratic display behavior during battery depletion, using only 3μA quiescent current. | Use Scenario: PLC I/O module operating in factory environment with unstable 3.3V auxiliary rail subject to motor switching noise. IC Role / Device Role / Timing Role: Monitors 3.3V rail and generates 1200ms reset pulse upon undervoltage, ensuring full firmware reload after recovery. Use Value: Eliminates need for external RC timing network while maintaining immunity to <150µs transients on VCC line. |
| Manual Reset in Test Equipment | Dual-Rail Power Sequencing Support |
Use Scenario: Benchtop oscilloscope requiring field-serviceable hard reset via front-panel button. IC Role / Device Role / Timing Role: Accepts debounced pushbutton signal on MR pin and asserts 1200ms reset pulse independent of VCC recovery timing. Use Value: Internal 63kΩ pullup enables direct switch-to-GND connection - no external resistor or debounce circuit required. | Use Scenario: FPGA-based data acquisition board with separate 1.2V core and 3.3V I/O supplies. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V rail; coordinated with secondary supervisor (e.g., MAX6387) monitoring 1.2V rail via RESET IN interface. Use Value: Enables synchronized reset assertion across multiple voltage domains using shared reset bus topology. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS31D4-T | Same 3.08V threshold and active-high push-pull output, but 1120ms VCC reset timeout (vs. 1200ms) | Suitable where slightly shorter reset hold time is acceptable, e.g., faster-booting microcontrollers | Select when 1120ms timeout meets system initialization requirements and tighter timing margin is needed |
| MAX6326XR31D7-T | Pin-compatible 4-pin SC70 package, same 3.08V threshold, but open-drain active-low output and no MR input | Requires external pullup resistor and cannot support manual reset functionality | Choose only if active-low signaling and absence of manual reset are acceptable in target design |
Compared with MAX6385XS31D4-T, the MAX6385XS31D7-T provides 80ms longer reset assertion for more conservative μP initialization; versus MAX6326XR31D7-T, it delivers active-high push-pull drive and integrated MR capability - eliminating external components and enabling field serviceability.
Availability
MAX6385XS31D7-T is available at Aetrix Electronics and suitable for portable instrumentation, industrial controllers, test equipment, and dual-rail power sequencing applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX6385XS31D7-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 is a semiconductor company specializing in analog and mixed-signal ICs for power, sensing, and connectivity applications, now part of Analog Devices.
The MAX6381–MAX6390 family was designed for ultra-low-power, high-accuracy microprocessor supervision in space- and energy-constrained systems such as battery-powered instruments and automotive ECUs.
FAQ
What is the exact reset threshold voltage of the MAX6385XS31D7-T?
The MAX6385XS31D7-T has a factory-set nominal reset threshold of 3.08V, with guaranteed accuracy of ±2.5% 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 "31" corresponds to VTH(min) = 3.00V, VTH(nom) = 3.08V, and VTH(max) = 3.15V at +25°C.
Does the MAX6385XS31D7-T support manual reset functionality?
Yes, the MAX6385XS31D7-T includes a dedicated active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for the full 1200ms timeout period after MR is released. This feature is explicitly documented in the Pin Description and Applications Information sections.
What package type and dimensions does the MAX6385XS31D7-T use?
The MAX6385XS31D7-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. It is RoHS-compliant (+T suffix), and this package variant is confirmed in the Ordering Information table under "MAX6385XS_ _D_+T" with 4-pin SC70 listed as the package option.
What is the minimum supply voltage at which the MAX6385XS31D7-T guarantees correct reset output behavior?
The MAX6385XS31D7-T guarantees valid reset output state down to VCC = 1.0V, as specified in both the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic high/low output levels during deep brownout conditions, preventing spurious resets or floating states that could destabilize the host microprocessor.
How does the reset timeout behavior differ between VCC recovery and manual reset events for the MAX6385XS31D7-T?
The MAX6385XS31D7-T applies the same 1200ms minimum timeout period for both VCC recovery and manual reset release - unlike the MAX6390, which offers asymmetric timing. This is confirmed in the Reset Timeout Period table, where D7 suffix specifies 1200ms for all MAX6384–MAX6386 variants, including MAX6385XS31D7-T, with no distinction between VCC and MR timeout durations.
MAX6385XS31D7-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:
- 3.08V
- 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
MAX6385XS31D7-T FAQ
1.How can I place an order for MAX6385XS31D7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS31D7-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 MAX6385XS31D7-T reliable?
The price and inventory of MAX6385XS31D7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS31D7-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS31D7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS31D7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS31D7-T?
MAX6385XS31D7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS31D7-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 MAX6385XS31D7-T?
For technical support, including MAX6385XS31D7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS31D7-T requirements.
6.How does Aetrix verify that MAX6385XS31D7-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS31D7-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 MAX6385XS31D7-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS31D7-T?
All MAX6385XS31D7-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS31D7-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 MAX6385XS31D7-T part is unused and in its original packaging.
Return procedure for MAX6385XS31D7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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