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Analog Devices Inc./Maxim Integrated MAX6389XS23D3
- Part No.:
- MAX6389XS23D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS23D3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,164
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Product details
Overview
MAX6389XS23D3 from Maxim Integrated is an open-drain active-low microprocessor supervisory circuit with factory-set 2.31V reset threshold, 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from +1.0V to +5.5V supply, consumes only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6389XS23D3 datasheet, MAX6389XS23D3 pinout, MAX6389XS23D3 application, or MAX6389XS23D3 equivalent, key selection criteria include its 2.31V ±2.5% threshold accuracy over -40°C to +125°C, 140ms VCC reset timeout, open-drain output requiring external pull-up, and dedicated RESET IN comparator referenced to +1.27V for secondary voltage supervision.
Technical Context
The MAX6389XS23D3 implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC rises above 2.31V.
A dedicated high-impedance RESET IN input compares external voltage against a stable +1.27V internal reference; reset asserts if either VCC < 2.31V or RESET IN < 1.27V. The open-drain RESET output sinks up to 80µA at VCC ≥ 1.0V with VOL ≤ 0.3V, requiring an external pull-up resistor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% (factory-set; enables precise brownout detection at 2.3V systems) |
| Reset Timeout | 140ms minimum (ensures µP initialization completes before release) |
| Supply Current | 3µA at +1.8V (enables multi-year operation in coin-cell–powered devices) |
| Operating Voltage | +1.0V to +5.5V (supports wide-range Li-ion, 1.8V/2.5V/3.3V/5V rails) |
| RESET Output Type | Open-drain active-low (requires external pull-up; compatible with mixed-voltage logic) |
| RESET IN Reference | +1.27V internal reference (allows user-defined secondary threshold via resistor divider) |
| Temp Range | -40°C to +125°C (qualified for automotive under-hood and industrial environments) |
Pinout & Package
MAX6389XS23D3 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.5mm × 1.0mm × 0.8mm, suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor; powers internal circuitry and sets fixed reset threshold |
| 2 | RESET (open-drain) | Active-low reset output; must be pulled up externally; asserts low during fault conditions |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to +1.27V reference; enables dual-rail supervision |
| 4 | GND | Ground reference for all internal comparators and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.31V threshold | Eliminates external resistor network; reduces BOM count and layout area |
| 140ms reset timeout | Matches typical µP boot-time requirements without overdesigning delay margin |
| RESET IN comparator | Enables independent monitoring of core or I/O rail without additional ICs |
| ±2.5% threshold accuracy | Guarantees reliable reset assertion across full industrial temperature range |
| 3µA supply current at 1.8V | Extends battery life in always-on wearable and sensor nodes |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell with 2.3V nominal output voltage. IC Role / Device Role / Timing Role: Supervises main supply and analog front-end rail; asserts reset if battery sags below 2.31V or sensor rail drops below user-defined threshold. Use Value: Prevents corrupted data acquisition during brownout; 3µA quiescent current extends operational life beyond 3 years. |
Use Scenario: DIN-rail mounted PLC module with separate 24V DC input and isolated 3.3V logic supply. IC Role / Device Role / Timing Role: Monitors both 24V input (via resistor divider on RESET IN) and 3.3V logic rail (VCC); triggers system-wide reset on either fault. Use Value: Eliminates need for two discrete supervisors; 140ms timeout ensures firmware initializes fully before peripheral enable. |
| Automotive Body Control Units | Smart Energy Meters |
|
Use Scenario: Under-dash BCM operating from vehicle battery (9V–16V) with internal 5V/3.3V regulators. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller supply (VCC) and monitors 5V regulator output (via RESET IN) for early failure detection. Use Value: Dual-monitoring capability detects regulator degradation before catastrophic failure; -40°C to +125°C rating meets AEC-Q100 Grade 2 requirements. |
Use Scenario: Revenue-grade meter with tamper-detection circuitry and real-time clock backed by supercapacitor. IC Role / Device Role / Timing Role: Ensures clean reset during AC mains dropout and supercapacitor switchover; RESET IN tracks backup rail voltage. Use Value: Open-drain output interfaces safely with isolated RTC domain; 140ms timeout prevents spurious resets during brief line dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT23D3 | Same electrical specs but in 6-pin µDFN-6 (L611-1) package; larger footprint, better thermal performance | Suitable for higher-power or thermally constrained PCB layouts where 4-pin SC70 density is insufficient | Select when board assembly uses µDFN-compatible reflow profile and thermal management requires lower junction rise |
| TLV809K23DBZR | 2.32V threshold, 140ms timeout, SOT-23-3 package; no RESET IN input; ±2% accuracy over -40°C to +125°C | Limited to single-rail monitoring; lacks auxiliary voltage supervision capability | Choose only when dual-supply monitoring is unnecessary and SOT-23-3 placement is preferred over SC70-4 |
Compared with MAX6389XS23D3, the LT23D3 variant offers identical functionality in a larger µDFN package for thermal or handling advantages, while TLV809K23DBZR provides cost-optimized single-rail supervision without RESET IN-making it unsuitable for applications requiring dual-voltage fault detection.
Availability
MAX6389XS23D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6389XS23D3 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 computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy supervisory circuits optimized for battery-operated and harsh-environment systems requiring guaranteed reset behavior across wide voltage and temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX6389XS23D3?
The MAX6389XS23D3 has a factory-set reset threshold of 2.31V, with ±2.5% accuracy over the full -40°C to +125°C operating temperature range. This value is specified in the Reset Thresholds table of the datasheet (suffix '23'), and the device guarantees valid reset assertion when VCC falls below this level, even down to VCC = 1V.
Does the MAX6389XS23D3 require an external pull-up resistor on the RESET pin?
Yes, the MAX6389XS23D3 features an open-drain active-low RESET output, which requires an external pull-up resistor to the appropriate logic rail (e.g., 3.3V or 5V). The datasheet specifies that the output sinks up to 80µA with VOL ≤ 0.3V at VCC ≥ 1.0V, so a typical 10kΩ–100kΩ pull-up ensures proper logic-high level when deasserted.
Can the MAX6389XS23D3 monitor two different supply voltages simultaneously?
Yes, the MAX6389XS23D3 supports dual-voltage monitoring: VCC is monitored against its fixed 2.31V threshold, and the RESET IN pin monitors a second voltage against an internal +1.27V reference. By connecting a resistor divider to RESET IN, users can set a custom threshold for the auxiliary rail-reset asserts if either voltage falls below its respective threshold.
What is the guaranteed minimum reset timeout period for the MAX6389XS23D3?
The MAX6389XS23D3 provides a guaranteed minimum reset timeout of 140ms after VCC rises above the 2.31V threshold. This value corresponds to the 'D3' suffix in the part number and is characterized across -40°C to +125°C. The actual timeout may extend up to 280ms per datasheet specifications, ensuring robust µP initialization.
Is the MAX6389XS23D3 compatible with other Maxim reset ICs in terms of pinout or footprint?
No, the MAX6389XS23D3 uses a 4-pin SC70 package (X4-1) with unique pin assignment (VCC, RESET, RESET IN, GND). It is not pin-compatible with 3-pin SC70 (e.g., MAX6381XR) or 6-pin µDFN variants (e.g., MAX6389LT23D3), nor with legacy MAX809-series parts. Layout redesign is required when substituting across package types.
MAX6389XS23D3 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.31V, Adj
- Output:
- Open Drain or Open Collector
- 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
MAX6389XS23D3 FAQ
1.How can I place an order for MAX6389XS23D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS23D3 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 MAX6389XS23D3 reliable?
The price and inventory of MAX6389XS23D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS23D3 is usually 5 days.
3.What payment methods are accepted for MAX6389XS23D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS23D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS23D3?
MAX6389XS23D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS23D3 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 MAX6389XS23D3?
For technical support, including MAX6389XS23D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS23D3 requirements.
6.How does Aetrix verify that MAX6389XS23D3 is sourced from the original manufacturer or authorized distributors?
All MAX6389XS23D3 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 MAX6389XS23D3 meets industry standards.
7.What is the process for return or replacement of MAX6389XS23D3?
All MAX6389XS23D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS23D3, 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 MAX6389XS23D3 part is unused and in its original packaging.
Return procedure for MAX6389XS23D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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