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Analog Devices Inc./Maxim Integrated MAX6387XS46D3+
- Part No.:
- MAX6387XS46D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS46D3+.pdf
- Description:
- MAX6387 SC70, SINGLE LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:1,921
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Product details
Overview
MAX6387XS46D3+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, factory-set 4.63V 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-critical embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6387XS46D3+ datasheet, MAX6387XS46D3+ pinout, MAX6387XS46D3+ application, or MAX6387XS46D3+ equivalent, key selection considerations include its dual-supply monitoring capability, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy across automotive temperature range, and SC70-4 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6387XS46D3+ integrates two independent reset comparators: one monitors VCC against a fixed 4.63V threshold, while the second compares an external voltage applied to the RESET IN pin against an internal +1.27V reference. Its reset assertion logic triggers when either monitored voltage falls below its respective threshold, and the active-low push-pull output remains asserted for a guaranteed minimum 140ms after recovery.
It features negative-going VCC transient immunity up to 35µs for 100mV overdrive, operates with 60ppm/°C reset threshold tempco, and guarantees valid reset state down to VCC = 1V - enabling robust operation during deep brownout conditions without external biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.63V nominal (min 4.51V, max 4.74V); factory-trimmed for precision brownout detection in +5V systems. |
| RESET Timeout Period | 140ms minimum; ensures µP initialization completes before release in systems with slow power-rail rise times. |
| Supply Current | 3µA at +1.8V; enables multi-year battery life in always-on monitoring applications. |
| Threshold Accuracy | ±2.5% over –40°C to +125°C; eliminates need for external calibration in automotive/industrial environments. |
| RESET IN Reference | +1.27V internal reference; allows user-defined secondary threshold via resistor divider (e.g., 3.3V or 2.5V rail monitoring). |
| Operating Voltage Range | 1.0V to 5.5V; supports valid reset assertion even during severe undervoltage events prior to full system shutdown. |
| Reset Output Type | Active-low push-pull; drives low without external pull-up, simplifying interface to µP reset inputs requiring active-low assertion. |
Pinout & Package
MAX6387XS46D3+ is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.25mm × 1.25mm × 0.9mm, suitable for high-density portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node; powers internal circuitry and sets fixed 4.63V reset threshold. |
| 2 | RESET | Active-low push-pull reset output; asserts low during VCC or RESET IN undervoltage and holds for 140ms minimum post-recovery. |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to +1.27V internal reference to enable dual-rail supervision (e.g., core + I/O supplies). |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold comparison and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset comparators | Simultaneously monitors VCC (4.63V) and external voltage via RESET IN (+1.27V reference), enabling true dual-supply supervision in SoC or FPGA power architectures. |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic reset behavior during deep brownout, eliminating race conditions where µP resets before supervisor deasserts. |
| Negative-going VCC transient immunity | Rejects glitches ≤35µs wide at 100mV overdrive, preventing spurious resets in electrically noisy environments like motor control or automotive ECUs. |
| Factory-trimmed ±2.5% threshold accuracy | Removes need for external trimming resistors or post-assembly calibration, reducing BOM count and test time in high-volume production. |
| Low 3µA supply current at +1.8V | Supports >10-year battery life in coin-cell-powered IoT sensors or backup supervisors where quiescent current dominates lifetime energy budget. |
Applications
| Industrial PLC Power Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors both 5V system rail and 3.3V microcontroller core supply in programmable logic controllers exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting single active-low reset signal when either rail drops below specification, with 140ms hold time ensuring firmware reload completion. Use Value: Prevents erratic PLC operation during line transients by guaranteeing reset assertion for ≥140ms even if both rails recover within 50ms. |
Use Scenario: Supervises 12V-to-5V DC/DC output and 5V-to-3.3V LDO output in body control units operating from -40°C to +125°C. IC Role / Device Role / Timing Role: Uses VCC pin for main 5V rail monitoring and RESET IN pin for 3.3V rail monitoring via resistor divider, triggering unified reset on first fault. Use Value: Eliminates need for two discrete supervisors, reducing footprint by 50% and improving thermal coupling between monitored rails. |
| Medical Wearable Battery Management | Network Edge Router Power Sequencing |
Use Scenario: Ensures safe shutdown of Bluetooth LE MCU and sensor ASIC when lithium coin cell voltage decays below 2.0V, while maintaining supervision down to 1.0V VCC. IC Role / Device Role / Timing Role: Leverages guaranteed reset validity at VCC = 1V to assert reset before brownout-induced data corruption occurs in flash memory writes. Use Value: Extends usable battery life by 12% versus comparators failing at 1.8V, as device remains functional until cell reaches end-of-discharge. |
Use Scenario: Coordinates power-up sequencing of FPGA, PHY, and management MCU in enterprise routers using dual-rail monitoring. IC Role / Device Role / Timing Role: Applies RESET IN to monitor auxiliary 1.8V FPGA core rail while VCC monitors primary 3.3V I/O rail, generating synchronized reset pulse. Use Value: Avoids timing violations during power-up by ensuring all domains are held in reset until both rails stabilize above thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT46D3+ | Same electrical specs but in 6-pin µDFN-6 (L611-1) package; 1.5mm × 1.0mm footprint vs. SC70-4's 1.25mm × 1.25mm. | Better thermal performance and higher board-level reliability in reflow-soldered industrial assemblies. | Select LT version for automated optical inspection (AOI) compatibility and improved solder joint integrity in high-reliability manufacturing. |
| TPS3808G33DBVR | TI part with 3.3V fixed threshold, 200ms timeout, and open-drain output; requires external pull-up; ±0.5% initial accuracy but ±3% over temperature. | Lacks auxiliary RESET IN input; cannot monitor dual rails without additional components. | Choose only if single-rail 3.3V supervision suffices and open-drain flexibility (e.g., wired-OR reset buses) is required. |
Compared with MAX6387LT46D3+, the SC70-4 package of MAX6387XS46D3+ saves 32% board area but trades off thermal dissipation margin; versus TPS3808G33DBVR, it delivers true dual-rail supervision and tighter temperature stability at the cost of fixed threshold flexibility.
Availability
MAX6387XS46D3+ is available at Aetrix Electronics and suitable for industrial PLC power monitoring, automotive body control modules, medical wearable battery management, and network edge router power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6387XS46D3+ 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, emphasizing low-power operation and high reliability.
The MAX6381–MAX6390 family was engineered specifically for ultra-low-power microprocessor supervision in space- and energy-constrained systems, with dual-voltage monitoring, sub-µA quiescent current, and AEC-Q100 qualified variants for automotive use.
FAQ
What is the exact reset threshold voltage of MAX6387XS46D3+ and how stable is it over temperature?
The MAX6387XS46D3+ has a factory-set VCC reset threshold of 4.63V nominal, with min/max values of 4.51V and 4.74V respectively. Its threshold accuracy is guaranteed at ±2.5% over the full –40°C to +125°C operating range, supported by a 60ppm/°C tempco. This stability eliminates recalibration needs in automotive and industrial environments where ambient temperature fluctuates widely.
Does MAX6387XS46D3+ support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6387XS46D3+ supports dual-rail supervision via its dedicated RESET IN pin. This pin connects to an external resistor divider network referenced to an internal +1.27V bandgap reference. By selecting appropriate resistor values, users can configure custom reset thresholds for a secondary rail (e.g., 3.3V or 2.5V). Reset asserts if either VCC falls below 4.63V or the voltage at RESET IN drops below +1.27V.
What is the reset timeout period of MAX6387XS46D3+, and is it guaranteed minimum or typical?
The MAX6387XS46D3+ provides a guaranteed minimum reset timeout period of 140ms after VCC or RESET IN recovers above their respective thresholds. This is not a typical value - it is a production-tested minimum across temperature and process corners, ensuring µP firmware initialization completes reliably even under worst-case voltage ramp conditions.
Can MAX6387XS46D3+ operate reliably when VCC drops below 1.8V, and down to what voltage does it maintain valid reset output?
Yes, MAX6387XS46D3+ is fully specified to operate down to VCC = 1.0V, and its reset output state is guaranteed valid at that level. Unlike many supervisors that fail below 1.8V, this device continues asserting reset correctly during deep brownout events, preventing undefined µP behavior and ensuring safe shutdown before critical registers lose state.
What package type and dimensions does MAX6387XS46D3+ use, and is it RoHS-compliant?
MAX6387XS46D3+ uses a lead-free 4-pin SC70 package (X4-1 code), with dimensions of 1.25mm × 1.25mm × 0.9mm. It complies with RoHS Directive 2011/65/EU and is marked with a "+" suffix per Maxim's packaging nomenclature, confirming its lead-free construction and suitability for modern environmentally regulated electronics manufacturing.
MAX6387XS46D3+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, 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
MAX6387XS46D3+ FAQ
1.How can I place an order for MAX6387XS46D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS46D3+ 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 MAX6387XS46D3+ reliable?
The price and inventory of MAX6387XS46D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS46D3+ is usually 5 days.
3.What payment methods are accepted for MAX6387XS46D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS46D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS46D3+?
MAX6387XS46D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS46D3+ 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 MAX6387XS46D3+?
For technical support, including MAX6387XS46D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS46D3+ requirements.
6.How does Aetrix verify that MAX6387XS46D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6387XS46D3+ 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 MAX6387XS46D3+ meets industry standards.
7.What is the process for return or replacement of MAX6387XS46D3+?
All MAX6387XS46D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS46D3+, 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 MAX6387XS46D3+ part is unused and in its original packaging.
Return procedure for MAX6387XS46D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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