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Analog Devices Inc./Maxim Integrated MAX6389XS44D3
- Part No.:
- MAX6389XS44D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS44D3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,026
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Product details
Overview
The MAX6389XS44D3 from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 4.38V 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 - ideal for battery-powered embedded systems requiring reliable power-up/brownout detection.
For engineers reviewing the MAX6389XS44D3 datasheet, MAX6389XS44D3 pinout, MAX6389XS44D3 application, or MAX6389XS44D3 equivalent, key selection considerations include its open-drain reset output requiring external pull-up, ±2.5% reset threshold accuracy over –40°C to +125°C, 1.27V internal reference for RESET IN comparator, 4-pin SC70 package, and compatibility with dual-rail voltage monitoring in portable instrumentation and industrial controllers.
Technical Context
The MAX6389XS44D3 integrates a precision bandgap reference, comparator-based VCC monitor with hysteresis, and a separate high-impedance RESET IN comparator referenced to 1.27V. Its reset assertion logic triggers when either VCC falls below 4.38V or RESET IN drops below 1.27V, with independent timing control ensuring deterministic reset hold time.
It features negative-going VCC transient immunity up to 35µs for 100mV overdrive, MR input glitch rejection of 100ns, and guaranteed reset state validity down to VCC = 1V - enabling robust operation during deep brownouts without external support circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (nominal), ±2.5% over –40°C to +125°C - ensures accurate power-fail detection across automotive/industrial temperature range |
| Reset Timeout | 140ms (min) - provides sufficient hold time for µP initialization before release |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level translation with external pull-up |
| RESET IN Reference | 1.27V internal reference - supports user-defined secondary reset threshold via resistor divider |
| Operating Voltage Range | +1.0V to +5.5V - guarantees functional reset assertion even during severe undervoltage conditions |
| VCC Transient Immunity | 35µs max duration for 100mV overdrive - suppresses false resets from short supply glitches |
Pinout & Package
MAX6389XS44D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.25mm × 0.75mm, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node - powers internal circuitry and sets fixed reset threshold |
| 2 | RESET | Open-drain active-low reset output - requires external pull-up resistor; asserts low during fault condition |
| 3 | RESET IN | Auxiliary voltage monitor input - compared against 1.27V internal reference; enables dual-supply supervision |
| 4 | GND | Analog/digital ground reference - must be connected to system ground plane for stable comparator operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN - eliminates need for second supervisor IC in dual-rail systems |
| Factory-trimmed threshold | 4.38V ±2.5% over full temperature range - removes calibration overhead and improves BOM consistency |
| Low-power operation | 3µA supply current at +1.8V - reduces quiescent load on coin-cell or energy-harvesting sources |
| Transient-immune design | 35µs immunity to 100mV VCC dips - prevents spurious resets in electrically noisy environments |
| Guaranteed reset validity | Valid logic state maintained down to VCC = 1V - ensures deterministic behavior during deep brownout recovery |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meter with dual-core MCU and analog front-end requiring coordinated reset during low-battery shutdown. IC Role / Device Role / Timing Role: Primary VCC supervisor and secondary rail monitor (via RESET IN) - asserts reset when main supply drops below 4.38V or sensor bias rail fails. Use Value: 140ms timeout ensures complete ADC shutdown and EEPROM save before power loss; 3µA quiescent current extends battery life by >2 years. |
Use Scenario: DIN-rail mounted I/O module with isolated 5V logic and 24V field-side power, needing independent fault detection on both rails. IC Role / Device Role / Timing Role: Dual-supply supervisor - monitors 5V logic rail directly and 24V field rail via resistor divider on RESET IN. Use Value: Eliminates discrete resistor network and comparator; ±2.5% threshold accuracy avoids false trips during 24V line ripple. |
| Smart Energy Meters | Automotive Body Control Units |
Use Scenario: ANSI C12.20-compliant electricity meter with real-time clock, metrology ASIC, and RF transceiver - all requiring synchronized reset after AC dropout. IC Role / Device Role / Timing Role: System-level reset coordinator - asserts open-drain RESET to tie multiple ICs together with single pull-up. Use Value: Open-drain output enables shared reset bus; 1.0V–5.5V operating range covers wide input variation from backup capacitor discharge. |
Use Scenario: 12V automotive body controller with 5V MCU domain and 3.3V CAN transceiver domain, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Brownout detector with transient immunity - ignores <35µs dips while asserting reset on sustained undervoltage. Use Value: Prevents MCU lockup during engine cranking; 4.38V threshold aligns with 5V regulator dropout point under load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT44D3 | Same electrical specs but in 6-pin µDFN-6 (L611-1) package - larger footprint, better thermal performance, no SC70 pinout compatibility | Preferred where board space permits and higher power dissipation margin is needed; not interchangeable in SC70 layout | Select for high-reliability industrial designs requiring enhanced thermal derating or reflow process compatibility with µDFN |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, push-pull active-low output - no RESET IN input, different timing and reference architecture | Suitable only for single-rail 3.3V systems; lacks dual-monitoring capability and open-drain flexibility | Choose only if redesigning for fixed 3.3V rail and accepting loss of auxiliary monitoring and wiring flexibility |
Compared with MAX6389XS44D3, the LT44D3 variant offers identical supervision functionality in a thermally superior µDFN package but requires PCB redesign, while the TPS3808G33DBVR sacrifices dual-rail capability and open-drain configurability for TI's production ecosystem integration.
Availability
MAX6389XS44D3 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart energy meters, and automotive body control units requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6389XS44D3 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 - emphasizing low power, high reliability, and extended temperature operation.
The MAX6381–MAX6390 family was engineered specifically for ultra-low-power microprocessor supervision in space- and energy-constrained systems, with emphasis on dual-voltage monitoring, factory-trimmed thresholds, and transient-immune reset generation.
FAQ
What is the exact reset threshold voltage of the MAX6389XS44D3?
The MAX6389XS44D3 has a factory-set nominal reset threshold of 4.38V, with tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "44" corresponds to VTH(nom) = 4.38V, VTH(min) = 4.27V, and VTH(max) = 4.48V.
Does the MAX6389XS44D3 support manual reset functionality?
No, the MAX6389XS44D3 does not include a manual reset (MR) input. According to the Selector Guide and Pin Description tables, MR is present only on MAX6384/MAX6385/MAX6386/MAX6390 - whereas MAX6389 belongs to the RESET IN group (MAX6387/MAX6388/MAX6389) and features only VCC, RESET, RESET IN, and GND pins in its 4-pin SC70 configuration.
What is the purpose of the RESET IN pin on the MAX6389XS44D3?
The RESET IN pin on the MAX6389XS44D3 connects to an internal comparator referenced to a precise 1.27V bandgap voltage. When the voltage at this pin falls below 1.27V, the device asserts reset - enabling user-configurable secondary voltage monitoring using an external resistor divider. This allows dual-rail supervision without adding a second supervisor IC.
Can the MAX6389XS44D3 operate reliably at VCC = 1.2V?
Yes, the MAX6389XS44D3 guarantees correct reset output logic state down to VCC = 1.0V, as specified in the Electrical Characteristics table. At VCC = 1.2V, it remains fully functional for reset assertion and deassertion, making it suitable for ultra-low-voltage backup domains and energy-harvesting applications where supply may dip below 1.8V.
What package type and dimensions does the MAX6389XS44D3 use?
The MAX6389XS44D3 uses a lead-free 4-pin SC70 package (package code X4-1), with outline dimensions of 1.0mm × 1.25mm × 0.75mm. The top-marking and pin 1 indicator follow standard SC70 conventions, and the package is compatible with standard reflow soldering profiles per JEDEC J-STD-020.
MAX6389XS44D3 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:
- 4.38V, 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
MAX6389XS44D3 FAQ
1.How can I place an order for MAX6389XS44D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS44D3 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 MAX6389XS44D3 reliable?
The price and inventory of MAX6389XS44D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS44D3 is usually 5 days.
3.What payment methods are accepted for MAX6389XS44D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS44D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS44D3?
MAX6389XS44D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS44D3 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 MAX6389XS44D3?
For technical support, including MAX6389XS44D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS44D3 requirements.
6.How does Aetrix verify that MAX6389XS44D3 is sourced from the original manufacturer or authorized distributors?
All MAX6389XS44D3 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 MAX6389XS44D3 meets industry standards.
7.What is the process for return or replacement of MAX6389XS44D3?
All MAX6389XS44D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS44D3, 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 MAX6389XS44D3 part is unused and in its original packaging.
Return procedure for MAX6389XS44D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6389XS44D3 Tags
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MIC826SYMT-TR
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