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Analog Devices Inc./Maxim Integrated MAX6389XS31D2+
- Part No.:
- MAX6389XS31D2+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS31D2+.pdf
- Description:
- MAX6389 SC70, SINGLE LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:23,997
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Product details
Overview
The MAX6389XS31D2+ from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 3.08V reset threshold, 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from +1.8V to +5.5V, draws only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6389XS31D2+ datasheet, MAX6389XS31D2+ pinout, MAX6389XS31D2+ application, or MAX6389XS31D2+ equivalent, key selection criteria include its open-drain active-low reset output, 3.08V ±2.5% threshold accuracy over –40°C to +125°C, 140ms reset timeout, auxiliary voltage monitor capability via RESET IN, and SC70-4 package compatibility with space-constrained embedded systems.
Technical Context
The MAX6389XS31D2+ integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V threshold, while its auxiliary RESET IN pin compares an external voltage to an internal +1.27V reference-enabling independent monitoring of a second supply rail. Reset assertion is latched and held for a guaranteed minimum 140ms after VCC or RESET IN recovers above their respective thresholds.
Its open-drain RESET output requires an external pullup resistor and supports mixed-voltage interfacing. The device features negative-going VCC transient immunity up to 35µs for 100mV overdrive, and its internal MR pullup resistor is omitted-confirming no manual reset input (unlike MAX6384–MAX6386/MAX6390), consistent with the MAX6389 family designation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.5% over –40°C to +125°C - ensures accurate brownout detection across industrial temperature range |
| Reset Timeout | 140ms minimum - guarantees µP reset hold time sufficient for full power stabilization |
| Supply Current | 3µA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion even during deep brownout down to 1V |
| RESET Output Type | Open-drain active-low - allows level-shifting and wired-OR reset bus configurations |
| Auxiliary Monitor | RESET IN input referenced to +1.27V - enables user-defined second-supply threshold via external resistor divider |
| Tempco | 60ppm/°C - minimizes threshold drift across temperature, critical for stable long-term reliability |
Pinout & Package
MAX6389XS31D2+ is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.5mm × 1.0mm × 0.8mm, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets fixed reset threshold |
| 2 | RESET (active-low) | Open-drain output requiring external pullup; asserts low during VCC or RESET IN undervoltage |
| 3 | RESET IN | High-impedance auxiliary input compared to +1.27V reference; enables dual-rail supervision |
| 4 | GND | Analog and digital ground reference; must be low-impedance connection for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 3.08V threshold | Eliminates external resistor networks and calibration, reducing BOM count and layout area |
| 140ms guaranteed reset timeout | Ensures µP reset remains asserted long enough for all internal regulators and clocks to stabilize |
| RESET IN auxiliary monitor | Allows independent supervision of I/O or core voltage rails without adding a second supervisor IC |
| 3µA supply current at 1.8V | Extends battery life in always-on wearable and sensor nodes beyond 10 years with CR2032 |
| Open-drain RESET with 0.3V VOL @ 80µA | Provides clean logic-low assertion compatible with 1.2V–5V host interfaces and shared reset buses |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless environmental sensor powered by a single Li-MnO₂ cell (2.0V–3.6V) must initiate clean boot on power-up and detect brownout before data corruption occurs. IC Role / Device Role / Timing Role: MAX6389XS31D2+ monitors main supply and asserts open-drain RESET to the MCU until VCC exceeds 3.08V and holds for 140ms. Use Value: Prevents firmware execution during unstable power ramp, eliminating spurious ADC readings and radio transmission errors. | Use Scenario: An isolated digital input module supplies separate 3.3V logic and 24V field-side power; both rails must be validated before enabling signal conditioning. IC Role / Device Role / Timing Role: MAX6389XS31D2+ uses VCC to monitor 3.3V logic rail and RESET IN (via R-divider) to supervise 24V-to-5V DC/DC output at 4.75V threshold. Use Value: Enables single-chip dual-rail supervision, reducing component count versus discrete comparators and saving 2.5mm² PCB area. |
| Medical Wearable ECG Patch | Automotive Body Control Module (BCM) |
Use Scenario: A disposable ECG patch uses ultra-low-power ASIC and BLE SoC; system must reset reliably after button-press wake-up or battery insertion. IC Role / Device Role / Timing Role: MAX6389XS31D2+ provides power-on reset and monitors ASIC core voltage (via RESET IN) while drawing <3µA during sleep. Use Value: Guarantees deterministic startup sequence and eliminates firmware lockups caused by marginal core voltage during cold start. | Use Scenario: BCM microcontroller requires reset validation of both 5V system rail and 3.3V CAN transceiver supply under load dump and cold-crank conditions. IC Role / Device Role / Timing Role: MAX6389XS31D2+ supervises 5V rail directly and uses RESET IN to monitor 3.3V rail derived from a secondary LDO, asserting common RESET line. Use Value: Ensures synchronized reset of MCU and CAN peripheral, preventing bus arbitration failures during power transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT31D2+ | Same electrical specs but in 6-pin µDFN-6 (1.5×1.0mm) instead of SC70-4; includes NC pins; higher thermal dissipation | Suitable for thermally demanding environments or when board real estate allows larger footprint | Select MAX6389LT31D2+ if PCB layout permits µDFN and thermal margin is critical; otherwise prefer SC70-4 for miniaturization. |
| TPS3808G33DBVR | 3.3V threshold (not 3.08V); 200ms timeout (not 140ms); push-pull active-low output; no RESET IN pin | Lacks auxiliary voltage monitoring; requires external pullup only if interfacing with higher-voltage logic | Choose TPS3808G33DBVR only if 3.3V threshold suffices and dual-rail supervision is unnecessary; verify timing compatibility with target µP. |
Compared with MAX6389LT31D2+, the MAX6389XS31D2+ saves 0.5mm² board area and simplifies routing with fewer pins; versus TPS3808G33DBVR, it delivers precise 3.08V detection, shorter 140ms timeout for faster boot, and essential dual-rail capability-making it irreplaceable in compact, multi-supply systems.
Availability
MAX6389XS31D2+ is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial PLC I/O modules, medical wearables, and automotive body control modules requiring stable component supply and long-lifecycle support.
Supply support for MAX6389XS31D2+ 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, computing, communications, and consumer applications.
The MAX6381–MAX6390 product line delivers ultra-low-power, factory-trimmed supervisory circuits optimized for space- and energy-constrained embedded systems requiring reliable power-on reset and dual-voltage monitoring.
FAQ
What is the exact reset threshold voltage of the MAX6389XS31D2+?
The MAX6389XS31D2+ has a factory-set reset threshold of 3.08V, with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "31" corresponds to VTH nominal = 3.08V), and applies specifically to the VCC monitor path-not the auxiliary RESET IN input.
Does the MAX6389XS31D2+ include a manual reset (MR) input?
No, the MAX6389XS31D2+ does not feature a manual reset input. Per the Selector Guide and Pin Description, MR is present only on MAX6384/MAX6385/MAX6386/MAX6390. The MAX6389XS31D2+ belongs to the MAX6387–MAX6390 group that includes RESET IN-but excludes MR-confirmed by its 4-pin SC70 pinout (VCC, RESET, RESET IN, GND) and absence of MR in functional block diagrams.
What is the function of the RESET IN pin on the MAX6389XS31D2+?
The RESET IN pin on the MAX6389XS31D2+ is a high-impedance input compared to an internal +1.27V reference. When the voltage at RESET IN falls below +1.27V, the device asserts RESET. It is intended for monitoring a second supply rail using an external resistor divider, enabling dual-voltage supervision without a second IC-e.g., setting a 4.75V threshold on a 5V rail via R1/R2 network per the datasheet equation.
What package type and dimensions does the MAX6389XS31D2+ use?
The MAX6389XS31D2+ uses a lead-free 4-pin SC70 package (package code X4-1), with outline dimensions of 1.5mm × 1.0mm × 0.8mm. This is explicitly stated in the Ordering Information table and verified in the Package Information section (drawing 21-0098). It is distinct from the 3-pin SC70 (X3-2) and 6-pin µDFN (L611-1) variants in the same family.
Can the MAX6389XS31D2+ operate reliably at VCC = 1.0V?
Yes, the MAX6389XS31D2+ guarantees valid RESET output state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Detailed Description sections. Its internal circuitry remains functional and correctly asserts or deasserts the open-drain RESET output even at this minimum supply voltage-critical for detecting deep brownout conditions before system collapse.
MAX6389XS31D2+ 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:
- 3.08V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6389XS31D2+ FAQ
1.How can I place an order for MAX6389XS31D2+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS31D2+ 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 MAX6389XS31D2+ reliable?
The price and inventory of MAX6389XS31D2+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS31D2+ is usually 5 days.
3.What payment methods are accepted for MAX6389XS31D2+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS31D2+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS31D2+?
MAX6389XS31D2+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS31D2+ 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 MAX6389XS31D2+?
For technical support, including MAX6389XS31D2+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS31D2+ requirements.
6.How does Aetrix verify that MAX6389XS31D2+ is sourced from the original manufacturer or authorized distributors?
All MAX6389XS31D2+ 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 MAX6389XS31D2+ meets industry standards.
7.What is the process for return or replacement of MAX6389XS31D2+?
All MAX6389XS31D2+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS31D2+, 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 MAX6389XS31D2+ part is unused and in its original packaging.
Return procedure for MAX6389XS31D2+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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