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Analog Devices Inc./Maxim Integrated MAX6389XS31D1+T
- Part No.:
- MAX6389XS31D1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS31D1+T.pdf
- Description:
- IC MPU/RESET CIRC 3.08V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,616
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Product details
Overview
MAX6389XS31D1+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 3.08V reset threshold (±2.5% over –40°C to +125°C), 1ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. 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 MAX6389XS31D1+T datasheet, MAX6389XS31D1+T pinout, MAX6389XS31D1+T application, or MAX6389XS31D1+T equivalent, key selection considerations include its 4-pin SC70 package, 3.08V VTH tolerance, 1ms tRP timing, open-drain output requiring external pullup, and dual-monitoring capability via RESET IN comparator referenced to +1.27V.
Technical Context
The MAX6389XS31D1+T integrates a precision voltage comparator for VCC monitoring and a separate high-impedance RESET IN comparator referenced to an internal +1.27V bandgap. Reset asserts when either VCC falls below 3.08V or RESET IN drops below 1.27V, with propagation delays under 5µs for RESET IN and 35µs for VCC transitions.
Its open-drain RESET output supports flexible logic-level interfacing across mixed-supply systems, guaranteed valid down to VCC = 1V, with VOL ≤ 0.3V at ISINK = 80µA. The device features negative-going VCC transient immunity up to 150µs for 100mV overdrive and operates across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.5% (–40°C to +125°C); ensures stable reset assertion during supply droop in 3.3V/2.5V systems |
| Reset Timeout | 1ms minimum; provides sufficient hold time for μP initialization after power recovery |
| Supply Current | 3μA at VCC = 1.8V; enables multi-year battery life in portable equipment |
| Operating Voltage | 1.0V to 5.5V; supports valid reset signaling even during deep brownout conditions |
| RESET Output Type | Open-drain active-low; allows wired-OR configuration and level-shifting with external pullup |
| RESET IN Threshold | +1.27V ±2.5%; enables user-defined secondary reset point via resistor divider |
| VCC Transient Immunity | 150µs max duration for 100mV overdrive; suppresses false resets from short supply glitches |
Pinout & Package
MAX6389XS31D1+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, optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor; powers internal circuitry and sets reset threshold reference |
| 2 | RESET | Open-drain active-low reset output; requires external pullup resistor to define logic-high level |
| 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane |
| 4 | RESET IN | Auxiliary voltage monitor input; compared to internal +1.27V reference for dual-rail supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN, enabling fault detection in multi-supply SoC platforms |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance over full temperature range eliminates need for external calibration |
| Ultra-low quiescent current | 3μA at 1.8V enables integration into always-on subsystems without compromising battery runtime |
| Guaranteed operation down to 1V | Valid RESET state maintained during severe brownout, ensuring deterministic μP behavior until complete power loss |
| Transient-immune comparator | Rejects sub-150µs negative VCC spikes up to 100mV below threshold, reducing false triggers in noisy environments |
Applications
| Industrial PLC I/O Modules | Medical Wearable Sensors |
|---|---|
Use Scenario: Monitoring both 3.3V logic supply and 1.8V sensor analog front-end in compact diagnostic devices. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting reset if either rail drops below safe operating margin during battery discharge or ESD event. Use Value: Prevents corrupted sensor data acquisition by halting μP execution until both supplies stabilize post-brownout. | Use Scenario: Power management in ultra-low-power ECG patch with coin-cell battery and dual-domain MCU. IC Role / Device Role / Timing Role: Primary reset generator with 1ms timeout, using RESET IN to supervise regulated core voltage while VCC monitors battery-derived rail. Use Value: Extends operational lifetime by eliminating unnecessary wakeups during marginal supply conditions. |
| Automotive Body Control Units | IoT Edge Node Gateways |
Use Scenario: Supervising 5V CAN transceiver supply and 3.3V microcontroller domain in AEC-Q100 qualified modules. IC Role / Device Role / Timing Role: Open-drain RESET output interfaces directly to µC's active-low reset pin; RESET IN monitors secondary domain for fail-safe redundancy. Use Value: Meets ASIL-B functional safety requirements through independent voltage monitoring paths and glitch-hardened comparators. | Use Scenario: Ensuring clean boot sequence in LPWAN gateways powered by energy-harvesting sources with unstable output. IC Role / Device Role / Timing Role: Low-current supervisor maintaining reset assertion during intermittent power availability, with 1ms timeout matching fast-boot MCU requirements. Use Value: Eliminates firmware lockup during cold-start by guaranteeing reset pulse width exceeds processor minimum specification. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS31D2+T | 20ms minimum reset timeout vs. 1ms for MAX6389XS31D1+T; identical VTH, package, and RESET IN functionality | Suitable where longer reset hold time is required for slower peripherals or legacy μPs | Select MAX6389XS31D2+T only if system boot sequence demands >1ms reset assertion. |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable via RESET IN); push-pull active-low output; 2.5μA typical ICC at 3.3V | Lacks auxiliary voltage monitoring; better suited for single-rail systems without secondary supply supervision | Choose TPS3808G33DBVR when dual-rail monitoring is unnecessary and board space permits SOT-23-5. |
Compared with MAX6389XS31D1+T, the D2 variant trades shorter timing for longer reset hold, while TPS3808G33DBVR sacrifices dual-monitoring flexibility for lower cost and simpler layout-neither offers pin compatibility or identical feature set.
Availability
MAX6389XS31D1+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical wearable sensors, automotive body control units, and IoT edge node gateways requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MAX6389XS31D1+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 and mixed-signal ICs for demanding industrial, automotive, and medical applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for battery-powered and safety-critical systems, emphasizing dual-rail monitoring, wide temperature operation, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6389XS31D1+T and how is it specified?
The MAX6389XS31D1+T has a factory-set reset threshold of 3.08V, with ±2.5% tolerance over the full operating temperature range (–40°C to +125°C). This value is guaranteed per the Electrical Characteristics table and corresponds to the "31" suffix in the part number, referencing the Reset Thresholds table where suffix 31 maps to nominal 3.08V.
Does MAX6389XS31D1+T support monitoring of two independent power rails?
Yes, MAX6389XS31D1+T supports dual-rail supervision: VCC is monitored against its 3.08V threshold, and the RESET IN pin compares an external voltage to an internal +1.27V reference. Reset asserts if either condition is violated, making MAX6389XS31D1+T ideal for systems with core and I/O domain supplies.
What is the function of the RESET IN pin on MAX6389XS31D1+T and how is it used?
The RESET IN pin on MAX6389XS31D1+T is a high-impedance input to a dedicated comparator referenced to +1.27V. It is used with an external resistor divider to set a custom reset threshold for a secondary supply rail. When the divided voltage falls below 1.27V, MAX6389XS31D1+T asserts reset independently of VCC status.
What package type and footprint does MAX6389XS31D1+T use?
MAX6389XS31D1+T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This RoHS-compliant surface-mount package is pin-compatible with other MAX6384–MAX6390 variants in the same SC70 format and requires no thermal pad.
Is MAX6389XS31D1+T suitable for automotive applications?
MAX6389XS31D1+T itself is not automotive-qualified; the /V suffix (e.g., MAX6389XS31D1/V+T) denotes AEC-Q100 qualification. While MAX6389XS31D1+T shares the same die and electrical specs, only versions explicitly ordered with /V meet automotive reliability and testing requirements.
MAX6389XS31D1+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:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6389XS31D1+T FAQ
1.How can I place an order for MAX6389XS31D1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS31D1+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 MAX6389XS31D1+T reliable?
The price and inventory of MAX6389XS31D1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS31D1+T is usually 5 days.
3.What payment methods are accepted for MAX6389XS31D1+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS31D1+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS31D1+T?
MAX6389XS31D1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS31D1+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 MAX6389XS31D1+T?
For technical support, including MAX6389XS31D1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS31D1+T requirements.
6.How does Aetrix verify that MAX6389XS31D1+T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS31D1+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 MAX6389XS31D1+T meets industry standards.
7.What is the process for return or replacement of MAX6389XS31D1+T?
All MAX6389XS31D1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS31D1+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 MAX6389XS31D1+T part is unused and in its original packaging.
Return procedure for MAX6389XS31D1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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