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Analog Devices Inc./Maxim Integrated MAX6387XS29D2+
- Part No.:
- MAX6387XS29D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS29D2+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,344
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Product details
Overview
MAX6387XS29D2+ from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low open-drain reset output, factory-set 2.93V VCC reset threshold (±2.5% over -40°C to +125°C), 20ms 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 dual-rail systems requiring reliable power-up sequencing and brownout protection.
For engineers reviewing the MAX6387XS29D2+ datasheet, MAX6387XS29D2+ pinout, MAX6387XS29D2+ application, or MAX6387XS29D2+ equivalent, key selection criteria include its 2.93V fixed VCC threshold, 20ms reset timeout, 4-pin SC70 package, auxiliary voltage monitoring capability, and compatibility with dual-supply microcontroller systems where independent core/I/O rail supervision is required.
Technical Context
The MAX6387XS29D2+ integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.93V threshold with ±2.5% accuracy over temperature, while the second compares an external voltage applied to RESET IN against an internal 1.27V reference. Its open-drain RESET output requires an external pullup and remains asserted low for ≥20ms after VCC or RESET IN recovers above their respective thresholds.
It features no manual reset input (MR) - distinguishing it from MAX6384–MAX6386/MAX6390 - and lacks internal pullup on MR, confirming absence of manual reset functionality. The device operates across 1.0V to 5.5V supply range and maintains guaranteed logic state on RESET down to VCC = 1V, enabling robust operation during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (nominal), ±2.5% over -40°C to +125°C - ensures precise brownout detection for 3.0V/3.3V rails |
| Reset Timeout Period | 20ms (minimum) - provides sufficient hold time for microcontroller initialization after power recovery |
| RESET Output Type | Active-low open-drain - requires external pullup; enables wired-OR configuration with other reset sources |
| Auxiliary Input | RESET IN comparator referenced to 1.27V - supports user-defined second-voltage threshold via resistor divider |
| Supply Current | 3μA at +1.8V - enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during severe undervoltage conditions |
| RESET IN Threshold Accuracy | ±1.3% over -40°C to +125°C (1.219V to 1.321V) - enables accurate secondary supply monitoring |
Pinout & Package
MAX6387XS29D2+ is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. Pin 1 is VCC, Pin 2 is RESET, Pin 3 is GND, and Pin 4 is RESET IN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Primary supply input and voltage monitor source | Supplies device bias and feeds main reset comparator; monitored for 2.93V threshold violation |
| 2 - RESET | Active-low open-drain reset output | Drives low when VCC or RESET IN falls below threshold; requires external pullup for logic-high state |
| 3 - GND | Analog and digital ground reference | Common return path for all internal circuits and external resistor dividers |
| 4 - RESET IN | Auxiliary voltage monitor input | High-impedance node compared to 1.27V internal reference; sets secondary reset threshold via external divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset monitoring | Simultaneous supervision of VCC (2.93V) and external voltage via RESET IN (1.27V reference) |
| Factory-trimmed precision threshold | 2.93V VCC threshold with ±2.5% tolerance over full industrial temperature range (-40°C to +125°C) |
| Ultra-low quiescent current | 3μA at +1.8V enables >10-year battery life in coin-cell-powered IoT sensors and wearables |
| Guaranteed reset validity down to 1V | Ensures deterministic reset assertion during deep brownout, preventing MCU lockup or code corruption |
| Open-drain RESET with flexible interface | Supports level-shifting, multi-source reset arbitration, and compatibility with legacy 5V-tolerant systems |
Applications
| Portable Medical Sensors | Dual-Rail Industrial Controllers |
|---|---|
|
Use Scenario: Wearable ECG patch powered by single Li-ion cell with separate 1.8V sensor rail and 3.3V BLE radio rail. IC Role / Device Role / Timing Role: Supervises both rails independently - VCC monitors 3.3V radio supply, RESET IN monitors 1.8V sensor supply via resistor divider - asserting unified reset if either fails. Use Value: Prevents partial system operation and data corruption by ensuring synchronized reset across heterogeneous voltage domains. |
Use Scenario: PLC I/O module using 24V-to-5V primary DC/DC and isolated 3.3V microcontroller supply, with separate 1.2V FPGA core rail. IC Role / Device Role / Timing Role: VCC monitors 3.3V MCU supply; RESET IN monitors FPGA core voltage derived from 1.2V LDO - triggers reset if either drops below safe operating level. Use Value: Eliminates need for two discrete supervisors, reducing BOM count and PCB area while maintaining fault isolation. |
| Battery-Powered Smart Meters | Automotive Body Control Modules |
|
Use Scenario: AMI meter with backup supercapacitor maintaining RTC and memory during AC mains failure. IC Role / Device Role / Timing Role: VCC tied to main 3.3V rail; RESET IN monitors supercap voltage - asserts reset before supercap falls below RTC retention threshold (~2.0V). Use Value: Enables graceful shutdown and nonvolatile register save prior to complete power loss, preserving metering integrity. |
Use Scenario: BCM managing door locks, lighting, and window controls with separate 5V MCU and 12V actuator supplies. IC Role / Device Role / Timing Role: VCC monitors 5V MCU rail; RESET IN monitors scaled 12V supply (via resistor divider) - detects both MCU undervoltage and battery sag events. Use Value: Provides single-chip dual-supply fault detection meeting AEC-Q100 requirements without external comparators or resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT29D2+ | Same electrical specs but in 6-pin μDFN (1.5mm × 1.5mm) instead of 4-pin SC70; includes NC pins | Higher density layout possible; better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Select for space-constrained designs needing improved power dissipation or compatibility with μDFN-referenced layouts |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no auxiliary RESET IN input; push-pull active-low output | Lacks dual-monitoring capability; requires external circuitry to supervise second rail | Choose only when supervising one rail and board area allows adding discrete components for secondary monitoring |
Compared with MAX6387XS29D2+, the μDFN variant offers superior thermal metrics and smaller footprint but requires different land pattern, while the TPS3808G33DBVR reduces integration by omitting the auxiliary comparator - increasing design complexity and component count for dual-rail systems.
Availability
MAX6387XS29D2+ is available at Aetrix Electronics and suitable for portable medical sensors, dual-rail industrial controllers, battery-powered smart meters, automotive body control modules, and critical microprocessor power monitoring requiring stable component supply and long-term lifecycle support.
Supply support for MAX6387XS29D2+ 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 demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor-based systems where reliability under brownout, dual-rail monitoring, and minimal quiescent current are essential design requirements.
FAQ
What is the exact reset threshold voltage of MAX6387XS29D2+ and how stable is it over temperature?
The MAX6387XS29D2+ has a factory-set nominal VCC reset threshold of 2.93V, with guaranteed tolerance of ±2.5% across the full operating temperature range of -40°C to +125°C. This means the actual threshold remains between 2.85V and 3.00V under all specified conditions, ensuring consistent brownout detection for 3.0V/3.3V systems without calibration.
Does MAX6387XS29D2+ support manual reset functionality?
No, MAX6387XS29D2+ does not include a manual reset (MR) input. Unlike MAX6384–MAX6386 or MAX6390, this variant omits MR entirely - confirmed by its pinout (VCC, RESET, GND, RESET IN) and the family selector guide. For manual reset capability, consider MAX6384XS29D2+ or MAX6390XS29D4+ instead.
How is the auxiliary RESET IN input used in MAX6387XS29D2+?
In MAX6387XS29D2+, the RESET IN pin connects to an internal 1.27V comparator reference. To monitor a second voltage, apply a resistor divider between that supply and GND, connecting the midpoint to RESET IN. The threshold is set by VTH = 1.27V × (R1/R2 + 1), enabling precise supervision of voltages like 1.2V cores or 2.5V analog rails without additional ICs.
What package type and dimensions does MAX6387XS29D2+ use?
MAX6387XS29D2+ uses a lead-free, RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. Its land pattern is documented as 90-0187, and thermal resistance is θJA = 322.6°C/W on a multilayer board - optimized for compact, low-power portable designs.
Can MAX6387XS29D2+ operate reliably at very low supply voltages?
Yes, MAX6387XS29D2+ guarantees correct reset output logic state down to VCC = 1.0V, per its Absolute Maximum Ratings and Electrical Characteristics table. This ensures deterministic behavior during deep brownout events, allowing safe microcontroller halt before supply collapse - a critical feature for data integrity in battery-powered systems.
MAX6387XS29D2+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Strip
- Product Status:
- Obsolete
- Programmable:
- -
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6387XS29D2+ FAQ
1.How can I place an order for MAX6387XS29D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS29D2+ 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 MAX6387XS29D2+ reliable?
The price and inventory of MAX6387XS29D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS29D2+ is usually 5 days.
3.What payment methods are accepted for MAX6387XS29D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS29D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS29D2+?
MAX6387XS29D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS29D2+ 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 MAX6387XS29D2+?
For technical support, including MAX6387XS29D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS29D2+ requirements.
6.How does Aetrix verify that MAX6387XS29D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6387XS29D2+ 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 MAX6387XS29D2+ meets industry standards.
7.What is the process for return or replacement of MAX6387XS29D2+?
All MAX6387XS29D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS29D2+, 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 MAX6387XS29D2+ part is unused and in its original packaging.
Return procedure for MAX6387XS29D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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