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Analog Devices Inc./Maxim Integrated MAX6387XS25D3
- Part No.:
- MAX6387XS25D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS25D3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,631
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Product details
Overview
The MAX6387XS25D3 from Maxim Integrated is a low-power, dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, 2.5V factory-set VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for monitoring a second voltage source. It operates from 1.0V to 5.5V supply and consumes only 3µA at +1.8V, targeting power-sensitive embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6387XS25D3 datasheet, MAX6387XS25D3 pinout, MAX6387XS25D3 application, or MAX6387XS25D3 equivalent, key selection considerations include its dual-monitoring capability (VCC + RESET IN), guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over full temperature range, and SC70-4 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6387XS25D3 integrates two independent voltage comparators: one monitors VCC against a fixed 2.5V threshold, while the other compares an external voltage applied to the RESET IN pin against an internal +1.27V reference. Reset asserts if either monitored voltage falls below its respective threshold, and remains asserted for a minimum 140ms timeout after recovery.
Its push-pull active-low RESET output drives low during assertion and high-impedance when deasserted-no external pull-up required-and guarantees correct logic state down to VCC = 1V. The device uses BiCMOS process technology, features negative-going VCC transient immunity up to 35µs at 100mV overdrive, and supports manual reset via MR only in sibling parts (not this variant).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.50V ±2.5% (±62.5mV) over -40°C to +125°C - ensures precise brownout detection across industrial temperature range |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for µP initialization before release |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| RESET Output Type | Active-low push-pull - eliminates need for external pull-up resistor and reduces BOM count |
| RESET IN Threshold | +1.27V internal reference - allows user-defined secondary reset point via external resistor divider |
| Reset Propagation Delay | 4.5µs max from RESET IN falling edge - ensures fast response to auxiliary supply faults |
Pinout & Package
MAX6387XS25D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.55mm, suitable for ultra-compact PCB designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node; powers internal circuitry and sets fixed reset threshold |
| 2 | RESET | Active-low push-pull reset output; drives low during fault condition and high when deasserted |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to +1.27V internal reference to enable dual-supply supervision |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for stable comparator operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of main VCC and secondary supply (via RESET IN) prevents false resets from single-point failures |
| Factory-trimmed 2.5V reset threshold | ±2.5% accuracy over -40°C to +125°C eliminates need for external calibration in harsh environments |
| 140ms minimum reset timeout | Guarantees µP core and peripherals fully stabilize before release, avoiding race conditions during power-up |
| Push-pull active-low RESET output | Drives low without external components and maintains valid logic state down to VCC = 1V for fail-safe behavior |
| +1.27V internal RESET IN reference | Enables precise secondary threshold setting (e.g., 3.3V or 1.8V) using only two external resistors |
Applications
| Industrial PLC I/O Modules | Medical Wearable Sensors |
|---|---|
Use Scenario: Monitoring both 3.3V microcontroller supply and 1.8V sensor interface rail in compact diagnostic patch devices. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting reset if either rail drops below safe operating level during battery discharge or ESD event. Use Value: Prevents corrupted sensor data logging by ensuring µP remains held in reset until both supplies are stable post-brownout. |
Use Scenario: Supervising core voltage and analog front-end supply in ultra-low-power ECG acquisition units powered by coin-cell batteries. IC Role / Device Role / Timing Role: Primary VCC monitor (2.5V threshold) and auxiliary RESET IN configured for 1.27V reference to detect LDO dropout on analog rail. Use Value: Enables >5-year battery life via 3µA quiescent current while guaranteeing clean boot sequence even at end-of-life battery voltage. |
| Automotive Body Control Units | IoT Edge Node Gateways |
Use Scenario: Validating 5V system rail and 3.3V CAN transceiver supply in under-hood modules exposed to wide thermal cycling. IC Role / Device Role / Timing Role: Resets MCU when either supply violates threshold; leverages ±2.5% accuracy over -40°C to +125°C for automotive-grade reliability. Use Value: Eliminates need for discrete comparators and timers, reducing footprint and qualification effort for AEC-Q100-compliant designs. |
Use Scenario: Ensuring robust startup in battery-backed LoRaWAN gateways where main 3.3V rail and backup RTC supply must both be validated. IC Role / Device Role / Timing Role: Uses RESET IN to monitor backup supply while VCC monitors primary rail; 140ms timeout aligns with typical RF IC initialization timing. Use Value: Avoids network join failures caused by partial initialization due to undetected secondary supply collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT25D3 | Same electrical specs but in 6-pin µDFN-6 (L611-1) package; 1.5mm × 1.0mm footprint vs. SC70-4's 1.0mm × 1.0mm | Better thermal performance and higher pin pitch ease hand-soldering; requires PCB redesign for pad layout | Select LT version for higher power dissipation margin or reflow process compatibility in dense layouts |
| TPS3808G125DBVR | TI part with 2.5V threshold, 200ms timeout, open-drain output, and no RESET IN pin; 1.6µA ICC at 1.8V | Lacks dual-supply monitoring; requires external pull-up; lower quiescent current but no auxiliary voltage supervision | Choose TPS3808G125DBVR only when secondary supply monitoring is unnecessary and lowest possible ICC is critical |
Compared with MAX6387LT25D3, the MAX6387XS25D3 saves board area in ultra-miniaturized designs but offers identical supervision functionality; versus TPS3808G125DBVR, it adds essential dual-rail fault detection at the cost of slightly higher ICC and larger package than the TI part's SOT-23-5.
Availability
MAX6387XS25D3 is available at Aetrix Electronics and suitable for industrial control systems, medical wearables, automotive body electronics, and IoT edge nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6387XS25D3 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 medical applications, emphasizing low power, high reliability, and small form factor.
The MAX6381–MAX6390 family was engineered specifically for space- and power-constrained microprocessor systems needing dual-supply supervision, factory-trimmed thresholds, and guaranteed reset behavior down to 1V VCC.
FAQ
What is the exact reset threshold voltage of the MAX6387XS25D3?
The MAX6387XS25D3 has a factory-set VCC reset threshold of 2.50V, with guaranteed accuracy of ±2.5% (±62.5mV) over the full operating temperature range of -40°C to +125°C. This value is laser-trimmed during production and does not require external calibration. The MAX6387XS25D3 datasheet specifies min/typ/max values of 2.44V/2.50V/2.56V at +25°C, tightening to 2.44V/2.50V/2.56V across temperature.
Does the MAX6387XS25D3 support manual reset functionality?
No, the MAX6387XS25D3 does not include a manual reset (MR) input. Manual reset capability is present only in MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6387XS25D3 is designed exclusively for automatic dual-voltage supervision via VCC and RESET IN pins, with no provision for external reset triggering.
What is the function of the RESET IN pin on the MAX6387XS25D3?
The RESET IN pin on the MAX6387XS25D3 connects to an internal +1.27V reference comparator, enabling supervision of a second voltage rail. By applying a divided version of the auxiliary supply to this pin, users can configure custom reset thresholds-for example, setting a 3.3V rail to trigger reset at 3.3V × (R2/(R1+R2)) = 1.27V. The MAX6387XS25D3 asserts reset if either VCC falls below 2.5V or RESET IN falls below 1.27V.
Can the MAX6387XS25D3 operate reliably at VCC = 1.0V?
Yes, the MAX6387XS25D3 guarantees correct RESET output logic state down to VCC = 1.0V, as confirmed in the Electrical Characteristics table. Its push-pull output remains functional and valid throughout this range, ensuring fail-safe reset assertion even during deep brownout conditions. This specification is explicitly tested and guaranteed-not just characterized-making the MAX6387XS25D3 suitable for ultra-low-voltage battery-powered applications.
What package type and dimensions does the MAX6387XS25D3 use?
The MAX6387XS25D3 uses a lead-free 4-pin SC70 package (package code X4-1), with nominal dimensions of 1.0mm × 1.0mm × 0.55mm and a pin pitch of 0.65mm. This ultra-compact outline is optimized for high-density PCB layouts in portable and wearable electronics. The package drawing is documented in Maxim's package outline 21-0098, and the top-marking includes date code and traceability identifiers per standard industry practice.
MAX6387XS25D3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.5V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6387XS25D3 FAQ
1.How can I place an order for MAX6387XS25D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS25D3 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 MAX6387XS25D3 reliable?
The price and inventory of MAX6387XS25D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS25D3 is usually 5 days.
3.What payment methods are accepted for MAX6387XS25D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS25D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS25D3?
MAX6387XS25D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS25D3 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 MAX6387XS25D3?
For technical support, including MAX6387XS25D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS25D3 requirements.
6.How does Aetrix verify that MAX6387XS25D3 is sourced from the original manufacturer or authorized distributors?
All MAX6387XS25D3 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 MAX6387XS25D3 meets industry standards.
7.What is the process for return or replacement of MAX6387XS25D3?
All MAX6387XS25D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS25D3, 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 MAX6387XS25D3 part is unused and in its original packaging.
Return procedure for MAX6387XS25D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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