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Analog Devices Inc./Maxim Integrated MAX6387XS29D2-T
- Part No.:
- MAX6387XS29D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6387XS29D2-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6387XS29D2-T from Maxim Integrated is a dual-voltage microprocessor supervisory circuit with active-low push-pull 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 precise brownout detection.
For engineers reviewing the MAX6387XS29D2-T datasheet, MAX6387XS29D2-T pinout, MAX6387XS29D2-T application, or MAX6387XS29D2-T 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 power domains.
Technical Context
The MAX6387XS29D2-T integrates two independent reset comparators: one monitors VCC against a precision 2.93V internal reference, while the second compares an external voltage applied to RESET IN against a stable +1.27V internal reference. Reset asserts when either monitored voltage falls below its respective threshold.
Its internal timer ensures a guaranteed minimum 20ms reset assertion after VCC or RESET IN recovers, with reset output held low during assertion and transitioning high upon timeout completion. The device operates across full industrial temperature range (-40°C to +125°C) and maintains ±2.5% threshold accuracy over that range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature extremes |
| Reset Timeout Period | 20ms minimum - provides sufficient time for microprocessor core and I/O stabilization after power recovery |
| RESET Output Type | Active-low push-pull - eliminates need for external pullup resistor and drives low-impedance reset line directly |
| Auxiliary Input | RESET IN comparator referenced to +1.27V - enables user-configurable second-voltage monitoring via external resistor divider |
| Supply Current | 3μA at +1.8V - supports ultra-low-power operation in always-on battery-backed subsystems |
| Operating Voltage Range | +1.0V to +5.5V - allows operation down to near-dead-battery conditions while supporting 3.3V/5V logic domains |
| Reset Output Validity | Guaranteed down to VCC = 1V - ensures deterministic reset state even during deep undervoltage events |
Pinout & Package
MAX6387XS29D2-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.25mm × 1.65mm × 0.95mm, suitable for space-constrained portable and embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor - powers internal circuitry and triggers reset when falling below 2.93V |
| 2 | RESET | Active-low push-pull reset output - drives microprocessor reset pin low during fault; no external pullup required |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | Auxiliary voltage monitor input - connects to center tap of resistor divider to set secondary reset threshold (e.g., for I/O rail) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main VCC and secondary rail via RESET IN, enabling coordinated reset in dual-supply systems |
| Precision ±2.5% reset threshold | Ensures consistent brownout behavior across full industrial temperature range without calibration |
| 20ms guaranteed reset timeout | Meets typical microcontroller power-up timing requirements for flash initialization and PLL lock |
| Ultra-low 3μA supply current at 1.8V | Extends battery life in always-on monitoring circuits such as real-time clock backup domains |
| Valid reset output down to VCC = 1V | Prevents metastability on reset line during deep undervoltage transients before complete power collapse |
Applications
| Power Sequencing in Dual-Rail Microcontrollers | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Coordinating startup of core and I/O voltage rails in ARM Cortex-M based controllers where VCORE must stabilize before I/O initialization. IC Role / Device Role / Timing Role: Monitors both VCORE (via VCC) and VIO (via RESET IN) and asserts single reset signal only after both exceed thresholds and hold for 20ms. Use Value: Eliminates need for discrete RC timing networks and ensures deterministic, temperature-stable sequencing without firmware intervention. | Use Scenario: Maintaining safe shutdown in handheld test equipment powered by Li-ion batteries with aging-induced voltage sag. IC Role / Device Role / Timing Role: Detects VCC drop below 2.93V and holds processor in reset for 20ms, preventing corrupted EEPROM writes during brownout. Use Value: 3μA quiescent current extends shelf life of battery-backed units; ±2.5% threshold stability avoids false resets due to temperature drift. |
| Industrial Sensor Node Supervision | Automotive Body Control Module (BCM) Subsystem |
Use Scenario: Ensuring clean boot of wireless sensor nodes operating from energy-harvesting sources with highly variable output voltage. IC Role / Device Role / Timing Role: Uses RESET IN to monitor harvested rail while VCC powers local logic; asserts reset if either falls below threshold. Use Value: Dual-input architecture accommodates intermittent power sources without requiring separate supervisors per rail. | Use Scenario: Monitoring 3.3V MCU supply and 5V CAN transceiver supply in AEC-Q100 qualified body control modules. IC Role / Device Role / Timing Role: Configured with 2.93V VCC threshold and RESET IN tied to 5V rail via 3.92kΩ/1.27kΩ divider (sets 5.00V threshold). Use Value: Single IC replaces two discrete supervisors, reducing BOM count and PCB area while meeting automotive temperature and reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387LT29D2-T | Same electrical specs but in 6-pin μDFN package - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Preferred for high-reliability industrial designs requiring enhanced thermal margin or board-level reworkability | Select when μDFN layout compatibility exists and thermal derating above 70°C is critical |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 20ms timeout, open-drain output - requires external pullup; 1.8μA ICC at 3.3V | Lacks auxiliary RESET IN input - cannot monitor dual voltages without additional components | Choose only for single-rail 3.3V systems where open-drain flexibility is needed and dual monitoring is unnecessary |
Compared with MAX6387XS29D2-T, the μDFN-packaged MAX6387LT29D2-T offers superior thermal dissipation but occupies more PCB area, while TPS3808G33DBVR provides lower quiescent current in 3.3V-only applications but omits the critical dual-voltage supervision capability.
Availability
MAX6387XS29D2-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, dual-rail microcontroller power sequencing, industrial sensor nodes, and automotive body control subsystems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6387XS29D2-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 applications.
The MAX6381–MAX6390 family delivers low-power, high-accuracy microprocessor supervisory circuits optimized for dual-voltage systems, battery longevity, and extended temperature operation in mission-critical embedded environments.
FAQ
What is the exact reset threshold voltage of MAX6387XS29D2-T and how stable is it over temperature?
The MAX6387XS29D2-T has a factory-set VCC reset threshold of 2.93V nominal, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This means the actual threshold remains between 2.85V and 3.00V across all temperatures, ensuring robust brownout detection without calibration. The device uses a precision bandgap reference and low-drift comparator design to achieve this stability, as confirmed in the Electrical Characteristics table on page 3 of the datasheet.
Does MAX6387XS29D2-T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6387XS29D2-T includes a dedicated RESET IN input that monitors a second voltage using an internal +1.27V reference. To configure it for a specific threshold (e.g., 5.00V), connect an external resistor divider between the target rail and ground, with the midpoint feeding RESET IN. The datasheet provides the formula R1 = R2 × [(VINTH/1.27V) − 1] for selecting resistor values. This feature enables true dual-rail supervision - for example, tracking both a 3.3V core supply and a 5V I/O rail - within a single 4-pin SC70 package.
What is the function of the RESET output on MAX6387XS29D2-T, and does it require external components?
The RESET output on MAX6387XS29D2-T is an active-low push-pull driver, meaning it actively pulls the output low during reset assertion and actively drives it high when deasserted. Unlike open-drain variants, it requires no external pullup resistor. This simplifies design, reduces component count, and ensures fast, low-impedance transitions - critical for driving modern microcontroller reset inputs with tight timing margins. The output remains valid down to VCC = 1V, guaranteeing correct logic state even during deep undervoltage conditions.
How does the 20ms reset timeout period of MAX6387XS29D2-T impact system reliability?
The 20ms minimum reset timeout period of MAX6387XS29D2-T ensures the microprocessor remains held in reset long enough for all internal circuits - including PLLs, memory controllers, and I/O buffers - to fully stabilize after power recovery. This prevents erratic execution or configuration errors during marginal power-up conditions. The timeout is generated by an internal precision oscillator, not an RC network, so it remains stable across voltage and temperature variations. For systems requiring longer delays (e.g., >100ms), alternative suffixes like D3 (140ms) or D4 (1120ms) are available in the same family.
Is MAX6387XS29D2-T suitable for automotive applications, and what qualifications does it meet?
MAX6387XS29D2-T itself is not automotive-qualified; however, the MAX6387 family includes /V suffix variants (e.g., MAX6387XS29D2/V+T) that are AEC-Q100 qualified for automotive use. The standard MAX6387XS29D2-T operates across -40°C to +125°C and meets industrial reliability standards, making it suitable for under-hood-adjacent or cabin electronics where full AEC-Q100 certification is not mandated. Its ±2.5% threshold accuracy, low 3μA supply current, and dual-voltage monitoring align with automotive subsystem requirements, but designers targeting certified automotive modules should select the /V version explicitly listed in the Ordering Information table.
MAX6387XS29D2-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- 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-T FAQ
1.How can I place an order for MAX6387XS29D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6387XS29D2-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 MAX6387XS29D2-T reliable?
The price and inventory of MAX6387XS29D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6387XS29D2-T is usually 5 days.
3.What payment methods are accepted for MAX6387XS29D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6387XS29D2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6387XS29D2-T?
MAX6387XS29D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6387XS29D2-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 MAX6387XS29D2-T?
For technical support, including MAX6387XS29D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6387XS29D2-T requirements.
6.How does Aetrix verify that MAX6387XS29D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6387XS29D2-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 MAX6387XS29D2-T meets industry standards.
7.What is the process for return or replacement of MAX6387XS29D2-T?
All MAX6387XS29D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6387XS29D2-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 MAX6387XS29D2-T part is unused and in its original packaging.
Return procedure for MAX6387XS29D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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