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Analog Devices Inc./Maxim Integrated MAX6387XS31D3+T
- Part No.:
- MAX6387XS31D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS31D3+T.pdf
- Description:
- IC MPU/RESET CIRC 3.08V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,197
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Product details
Overview
MAX6387XS31D3+T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull reset output, factory-set 3.08V 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 consumes only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V, used in battery-powered instrumentation requiring dual-rail power integrity.
For engineers reviewing the MAX6387XS31D3+T datasheet, MAX6387XS31D3+T pinout, MAX6387XS31D3+T application, or MAX6387XS31D3+T equivalent, key selection criteria include its 3.08V fixed VCC threshold, 140ms reset timeout, 4-pin SC70 package, auxiliary voltage monitoring capability, and guaranteed operation down to 1V supply - critical for low-power brownout detection in portable systems.
Technical Context
The MAX6387XS31D3+T integrates two independent voltage comparators: one monitors VCC against a factory-trimmed 3.08V threshold with ±2.5% accuracy across –40°C to +125°C, and the other compares the external RESET IN pin to an internal 1.27V reference (±1.2% over temperature). Reset asserts if either comparator trips, and remains asserted for 140ms after recovery.
Its push-pull active-low RESET output drives directly without external pullup, supports sink currents up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V), and maintains logic validity down to VCC = 1V. The device features negative-going VCC transient immunity and operates on supply voltages from +1.0V to +5.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for μP initialization after power recovery |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor, reduces BOM count and board space |
| Auxiliary Input | RESET IN pin referenced to 1.27V - allows user-configurable second-voltage monitoring via external resistor divider |
| Operating Voltage Range | +1.0V to +5.5V - supports operation during deep brownout and compatibility with 1.2V–5V system rails |
| Reset Assertion Validity | Guaranteed down to VCC = 1V - ensures deterministic reset behavior even during severe undervoltage conditions |
Pinout & Package
MAX6387XS31D3+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 portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail - powers internal circuitry and triggers reset when falling below 3.08V |
| 2 | RESET | Active-low push-pull output - drives low during reset condition; no external pullup required; sinks up to 3.2mA |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | Auxiliary voltage monitor input - high-impedance node compared to internal 1.27V reference; enables dual-rail supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC (3.08V) and external rail via RESET IN (1.27V reference) - eliminates need for second supervisor IC |
| Factory-trimmed precision threshold | 3.08V ±2.5% over full temperature range - removes calibration overhead and improves system reliability |
| Ultra-low quiescent current | 3μA at +1.8V - extends battery life in energy-harvesting and IoT edge sensors |
| Valid reset output at low VCC | RESET state guaranteed down to VCC = 1V - prevents spurious release during slow power ramp-down |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches up to 100mV below threshold - improves noise robustness in electrically noisy environments |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG or glucose monitoring in wearable patches powered by coin-cell batteries. IC Role / Device Role / Timing Role: Dual-rail supervisor ensuring both analog front-end (1.8V) and digital core (3.3V) remain in reset until both supplies stabilize post-power-up. Use Value: Prevents corrupted sensor readings or flash writes during brownout by asserting reset until both rails exceed their thresholds - enabled by VCC and RESET IN monitoring. | Use Scenario: Environmental data collection in remote field nodes using Li-SOCl₂ primary cells with wide VCC droop. IC Role / Device Role / Timing Role: Low-current supervisor maintaining valid reset assertion during gradual battery depletion down to 1.0V. Use Value: Guarantees μC remains held in reset until VCC recovers above 3.08V, avoiding erratic execution during marginal supply - supported by 3μA ICC and 1V operational floor. |
| Industrial Handheld Terminals | Dual-Voltage Microcontroller Systems |
Use Scenario: Ruggedized barcode scanners with separate 5V motor driver and 3.3V logic rails. IC Role / Device Role / Timing Role: Monitors main 5V rail (via VCC) and isolated 3.3V I/O rail (via RESET IN) to prevent interface lockup during partial power loss. Use Value: Eliminates need for discrete voltage dividers or second supervisor; RESET IN's 1.27V reference enables precise 3.3V supervision with <1% error using standard 1% resistors. | Use Scenario: FPGA-based control modules with core (1.2V) and I/O (3.3V) domains requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Provides synchronized reset pulse triggered by either domain failure - VCC monitors 3.3V I/O rail, RESET IN monitors 1.2V core via resistor divider. Use Value: Ensures deterministic system startup by holding reset until both rails are stable, preventing configuration errors due to timing skew between power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT31D3+T | Same electrical specs but in 6-pin µDFN package - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Suitable for thermally demanding industrial PCBs where SC70 thermal limits may be exceeded | Select when board layout allows larger package and higher power dissipation margin is needed |
| TLV809K31DBZR | Single-supply 3.08V supervisor (no RESET IN), 140ms timeout, 0.5μA ICC at 1.8V - lower current but no dual-monitoring capability | Fits cost-sensitive single-rail applications where auxiliary voltage monitoring is unnecessary | Choose only if dual-voltage supervision is not required and ultra-low ICC (<1μA) is prioritized over feature set |
Compared with MAX6387XS31D3+T, the LT31D3+T variant offers identical functionality in a thermally superior µDFN package, while TLV809K31DBZR trades dual-monitoring capability for significantly lower quiescent current - making it viable only in single-rail, ultra-low-power contexts where RESET IN is unused.
Availability
MAX6387XS31D3+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial handheld terminals, and dual-voltage microcontroller systems requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6387XS31D3+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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6381–MAX6390 family delivers low-power, high-accuracy microprocessor supervisory circuits optimized for battery-operated and thermally constrained systems requiring dual-voltage monitoring and guaranteed reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage of MAX6387XS31D3+T and how stable is it over temperature?
The MAX6387XS31D3+T has a factory-set VCC reset threshold of 3.08V nominal, with ±2.5% tolerance guaranteed over the full operating temperature range of –40°C to +125°C. This stability is achieved through laser-trimming during production and validated by design - meaning the device will assert reset whenever VCC falls below 2.998V (min) or above 3.162V (max) across that range, ensuring consistent brownout protection in automotive and industrial environments.
Does MAX6387XS31D3+T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6387XS31D3+T supports dual-voltage supervision via its dedicated RESET IN pin, which compares an external voltage to an internal 1.27V reference (±1.2% over temperature). To monitor a second rail such as 3.3V or 5V, connect a resistor divider between that rail and GND, with the midpoint fed to RESET IN. The threshold is set using R1 = R2 × ((VINTH/1.27V) – 1), enabling precise, user-adjustable secondary supervision without additional ICs.
What is the reset timeout period of MAX6387XS31D3+T, and is it guaranteed minimum or typical?
The MAX6387XS31D3+T has a guaranteed minimum reset timeout period of 140ms after VCC rises above the 3.08V threshold or after the RESET IN voltage recovers. This is a minimum specification - actual timeout may be longer (up to 280ms per datasheet table), ensuring the microprocessor receives sufficient hold time for complete initialization before release, even under worst-case process and temperature conditions.
Can MAX6387XS31D3+T operate reliably at very low supply voltages, and what is the lowest functional VCC?
Yes, MAX6387XS31D3+T guarantees correct RESET output logic state down to VCC = 1.0V - meaning it remains fully functional and asserts/deasserts reset predictably even during deep brownout conditions. Below 1.0V, the internal circuitry may cease operation, but the 1V floor ensures deterministic behavior during gradual battery discharge or unregulated supply sag common in portable equipment.
What package type and dimensions does MAX6387XS31D3+T use, and is it RoHS-compliant?
MAX6387XS31D3+T uses a lead(Pb)-free, RoHS-compliant 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix explicitly denotes tape-and-reel packaging with RoHS compliance, and the package features a thermal resistance of θJA = 322.6°C/W on a multilayer board - suitable for compact, thermally constrained layouts in wearables and handheld devices.
MAX6387XS31D3+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:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.08V, 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
MAX6387XS31D3+T FAQ
1.How can I place an order for MAX6387XS31D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS31D3+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 MAX6387XS31D3+T reliable?
The price and inventory of MAX6387XS31D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS31D3+T is usually 5 days.
3.What payment methods are accepted for MAX6387XS31D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS31D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS31D3+T?
MAX6387XS31D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS31D3+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 MAX6387XS31D3+T?
For technical support, including MAX6387XS31D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS31D3+T requirements.
6.How does Aetrix verify that MAX6387XS31D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS31D3+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 MAX6387XS31D3+T meets industry standards.
7.What is the process for return or replacement of MAX6387XS31D3+T?
All MAX6387XS31D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS31D3+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 MAX6387XS31D3+T part is unused and in its original packaging.
Return procedure for MAX6387XS31D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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