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Analog Devices Inc./Maxim Integrated MAX6389XS46D3-T
- Part No.:
- MAX6389XS46D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS46D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:12,500
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Product details
Overview
The MAX6389XS46D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.63V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in embedded power management systems.
For engineers reviewing the MAX6389XS46D3-T datasheet, MAX6389XS46D3-T pinout, MAX6389XS46D3-T application, or MAX6389XS46D3-T equivalent, this page delivers verified electrical specs, SC70-4 package mapping, reset timing behavior, dual-supply monitoring capability, and automotive-grade AEC-Q100 qualification status.
Technical Context
The MAX6389XS46D3-T integrates a precision voltage comparator monitoring VCC against a fixed 4.63V threshold and a separate auxiliary comparator referenced to +1.27V at the RESET IN pin, enabling independent monitoring of a second supply rail via external resistor divider. Its internal timer guarantees 140ms minimum reset assertion after VCC recovery or RESET IN recovery.
It features open-drain RESET output requiring external pullup, guaranteed valid logic state down to VCC = 1.0V, ±2.5% threshold accuracy across temperature, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive - all within a 4-pin SC70 package rated for -40°C to +125°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (nominal), ±2.5% over -40°C to +125°C - ensures reliable brownout detection for 5V/4.5V systems |
| Reset Timeout | 140ms (min) - holds μP in reset long enough for stable power-up of core and I/O supplies |
| Supply Current | 3μA at +1.8V, 6μA at +3.6V - enables battery-backed or ultra-low-power always-on monitoring |
| RESET Output Type | Open-drain active-low - supports wired-OR reset buses and mixed-voltage system interfacing |
| Auxiliary Input | RESET IN pin with +1.27V reference - allows user-defined second-supply threshold via resistor divider |
| Operating Temp | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC Range | 1.0V to 5.5V - guarantees reset validity during deep brownout and supports wide-input power rails |
Pinout & Package
MAX6389XS46D3-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, with thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input; powers internal circuitry and serves as primary reset monitor input |
| 2 | RESET (open-drain) | Active-low reset signal output; requires external pullup resistor to host supply rail |
| 3 | GND | Analog/digital ground reference; must be connected directly to system ground plane |
| 4 | RESET IN | Auxiliary high-impedance input; compared to +1.27V internal reference for secondary supply monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring | Simultaneous VCC and RESET IN comparators enable independent reset assertion from two rails |
| Factory-trimmed threshold | 4.63V nominal with ±2.5% tolerance over full temperature range eliminates external calibration |
| Low-power operation | 3μA supply current at 1.8V allows integration into energy-harvesting or coin-cell-powered systems |
| Transient immunity | Validates negative-going VCC glitches ≤35µs at 100mV overdrive without spurious reset assertion |
| AEC-Q100 qualified | Automotive-grade reliability certified for use in engine control, ADAS, and infotainment subsystems |
Applications
| Industrial PLC Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Monitoring both 5V main logic supply and 3.3V I/O rail during cold-cranking and load-dump events. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting shared reset line when either rail drops below safe operating level. Use Value: Prevents firmware corruption by guaranteeing 140ms reset hold time after recovery of either monitored supply. | Use Scenario: Ensuring safe boot of microcontroller in body control unit during battery voltage sag below 9V. IC Role / Device Role / Timing Role: Primary VCC supervisor (4.63V threshold) with auxiliary RESET IN monitoring 12V-to-5V regulator output. Use Value: Enables fail-safe shutdown if either main or derived supply fails, meeting ISO 16750-2 pulse test requirements. |
| Medical Infusion Pump Logic Supply | Smart Energy Meter Dual-Rail Monitoring |
Use Scenario: Supervising isolated 3.3V MCU supply and 5V analog front-end supply in battery-operated infusion device. IC Role / Device Role / Timing Role: Open-drain RESET output interfaces directly to MCU reset pin while supporting shared reset bus with other peripherals. Use Value: Ultra-low 3μA quiescent current extends battery life; 140ms timeout ensures ADC and motor driver initialization completes before release. | Use Scenario: Monitoring 3.3V microcontroller supply and 2.5V metrology ADC reference supply in ANSI C12.20-certified meter. IC Role / Device Role / Timing Role: RESET IN pin configured for 2.5V threshold using 1.27V internal reference and precision resistor divider. Use Value: Guarantees synchronized reset of digital and analog domains upon any supply fault, preserving meter calibration integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT46D3-T | Same electrical specs but in 6-pin µDFN package; no SC70 footprint compatibility | Preferred for high-density PCBs where thermal performance (θJA = 477°C/W vs. 322.6°C/W) is less critical than size | Select when board space allows larger package and higher thermal resistance is acceptable |
| TPS3808G33DBVR | 3.3V fixed threshold (not 4.63V); 200ms default timeout; push-pull output (not open-drain) | Suitable for single-rail 3.3V systems only; lacks auxiliary RESET IN input | Choose only for cost-sensitive 3.3V-only designs without dual-supply monitoring requirement |
Compared with MAX6389XS46D3-T, the MAX6389LT46D3-T offers identical functionality in a thermally less efficient but mechanically more robust µDFN package, while TPS3808G33DBVR provides lower-cost single-rail supervision at the expense of threshold flexibility, dual-monitoring capability, and open-drain interoperability.
Availability
MAX6389XS46D3-T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.
Supply support for MAX6389XS46D3-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 demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy microprocessor supervisory circuits optimized for dual-rail monitoring, automotive qualification, and space-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6389XS46D3-T?
The MAX6389XS46D3-T has a factory-set nominal reset threshold of 4.63V, with guaranteed 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 official datasheet and applies specifically to the "46" suffix variant. The MAX6389XS46D3-T uses this threshold to monitor VCC and assert reset when the supply falls below this level.
Does the MAX6389XS46D3-T support monitoring of a second voltage rail?
Yes, the MAX6389XS46D3-T includes a dedicated RESET IN pin that connects to an internal +1.27V reference comparator. By applying a resistor divider to this pin, users can configure a custom reset threshold for a second supply rail - for example, setting a 3.3V threshold using R1 = 158kΩ and R2 = 100kΩ. This dual-monitoring capability is intrinsic to the MAX6389XS46D3-T and is documented in the Pin Description and Applications Information sections.
What is the function of the RESET output on the MAX6389XS46D3-T?
The RESET output of the MAX6389XS46D3-T is an open-drain, active-low signal. It pulls low when VCC falls below 4.63V or when the voltage at RESET IN drops below its programmed threshold, and remains low for a guaranteed minimum of 140ms after recovery. Because it is open-drain, an external pullup resistor is required - typically to the host MCU's VDDIO rail. This design allows wired-OR connection with other reset sources, a key feature of the MAX6389XS46D3-T.
Is the MAX6389XS46D3-T qualified for automotive applications?
Yes, the MAX6389XS46D3-T is AEC-Q100 qualified for automotive use. The "+T" suffix denotes RoHS-compliance, and the device is specified for operation across -40°C to +125°C, meeting Grade 1 automotive temperature requirements. Its transient immunity, precise threshold accuracy, and dual-supply monitoring make it suitable for body control modules, infotainment systems, and ADAS subsystems - all validated per the MAX6381–MAX6390 family's automotive qualification documentation.
What package type and dimensions does the MAX6389XS46D3-T use?
The MAX6389XS46D3-T is supplied in a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This compact RoHS-compliant package features gull-wing leads and is optimized for reflow soldering. Its thermal resistance is θJA = 322.6°C/W on a multilayer PCB - a value explicitly published in the Package Information section of the MAX6389XS46D3-T datasheet.
MAX6389XS46D3-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:
- 4.63V, 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
MAX6389XS46D3-T FAQ
1.How can I place an order for MAX6389XS46D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS46D3-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 MAX6389XS46D3-T reliable?
The price and inventory of MAX6389XS46D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS46D3-T is usually 5 days.
3.What payment methods are accepted for MAX6389XS46D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS46D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS46D3-T?
MAX6389XS46D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS46D3-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 MAX6389XS46D3-T?
For technical support, including MAX6389XS46D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS46D3-T requirements.
6.How does Aetrix verify that MAX6389XS46D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS46D3-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 MAX6389XS46D3-T meets industry standards.
7.What is the process for return or replacement of MAX6389XS46D3-T?
All MAX6389XS46D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS46D3-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 MAX6389XS46D3-T part is unused and in its original packaging.
Return procedure for MAX6389XS46D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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