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Analog Devices Inc./Maxim Integrated MAX6389XS44D3-T
- Part No.:
- MAX6389XS44D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS44D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
MAX6389XS44D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.38V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum VCC 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 MAX6389XS44D3-T datasheet, MAX6389XS44D3-T pinout, MAX6389XS44D3-T application, or MAX6389XS44D3-T equivalent, key selection criteria include its 4-pin SC70 package, ±2.5% reset threshold accuracy across automotive temperature range, 140ms VCC reset timeout, auxiliary voltage monitoring capability via RESET IN, and guaranteed valid reset state down to VCC = 1V.
Technical Context
The MAX6389XS44D3-T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and internal 1.27V reference for its auxiliary RESET IN input. Its reset assertion logic responds to either VCC falling below 4.38V or RESET IN falling below 1.27V, with independent timing control for VCC-initiated and auxiliary-initiated resets.
It features an open-drain RESET output requiring external pullup, supports negative-going VCC transient immunity up to 35µs at 100mV overdrive, and guarantees correct output state down to VCC = 1V - enabling robust operation during deep brownout conditions without external level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (4.27V–4.48V), ±2.5% over –40°C to +125°C - ensures stable trip point across automotive temperature range |
| VCC Reset Timeout | 140ms 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 Range | 1.0V to 5.5V - supports valid reset assertion even during severe undervoltage events |
| Auxiliary Input | RESET IN comparator referenced to 1.27V - allows user-defined secondary voltage monitoring via resistor divider |
| Output Type | Open-drain active-low - enables wired-OR reset bus configuration with multiple supervisors |
| Reset Propagation Delay | 4.5µs from RESET IN falling edge - ensures fast response to auxiliary fault conditions |
Pinout & Package
MAX6389XS44D3-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, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor - powers internal circuitry and triggers reset when below 4.38V |
| 2 | RESET | Open-drain active-low reset output - requires external pullup; asserts low on VCC or RESET IN fault |
| 3 | GND | Analog and digital ground reference - must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | Auxiliary voltage monitor input - high-impedance node compared to internal 1.27V reference for dual-rail supervision |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.38V with ±2.5% tolerance over full automotive temperature range - eliminates need for external calibration |
| Dual-supply monitoring capability | Independent VCC and RESET IN comparators - enables supervision of core and I/O rails simultaneously |
| Low-power operation | 3μA supply current at 1.8V - reduces quiescent load in always-on subsystems |
| Robust transient immunity | 35µs maximum glitch rejection at 100mV overdrive - prevents false resets from short supply noise spikes |
| Guaranteed operation down to 1V | Valid reset output state maintained until VCC drops to 1.0V - supports graceful shutdown in deep brownout |
Applications
| Power Monitoring in Dual-Voltage Systems | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Supervising both 5V I/O rail and 3.3V core rail in a microcontroller-based sensor hub where independent voltage faults must trigger system reset. IC Role / Device Role / Timing Role: Dual-input supervisor asserting single open-drain RESET signal when either rail falls below its threshold - simplifies reset tree design. Use Value: Eliminates need for two discrete supervisors and OR-gating logic, reducing BOM count and PCB area by 40% versus discrete solution. | Use Scenario: Providing fail-safe reset for a CAN-connected BCM operating in under-hood environment with wide temperature swings and supply transients. IC Role / Device Role / Timing Role: Automotive-qualified (AEC-Q100) supervisor ensuring deterministic reset behavior during cold cranking (VCC dip to 2.5V) and load dump events. Use Value: ±2.5% threshold accuracy and 140ms timeout guarantee μP reset hold time meets ISO 16750-2 pulse 4a requirements for 12V systems. |
| Portable Medical Instrument Power Management | Industrial PLC I/O Module |
Use Scenario: Enabling long battery life in handheld glucose meter while maintaining reliable power-on reset and low-battery warning via auxiliary rail monitoring. IC Role / Device Role / Timing Role: Low-current (3μA) supervisor with RESET IN used to monitor battery voltage divider - triggers reset before critical brownout. Use Value: 3μA supply current extends 2×AA battery life to >5 years in standby, while 140ms timeout ensures complete μP boot sequence completion. | Use Scenario: Supervising isolated 24V field power and 3.3V logic supply in DIN-rail mounted I/O module exposed to industrial EMI and voltage surges. IC Role / Device Role / Timing Role: Open-drain RESET output interfaced to optocoupled reset input - provides galvanic isolation between field and logic domains. Use Value: Open-drain architecture allows shared reset bus across multiple isolated sections, reducing component count and improving fault containment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT44D3-T | Same electrical specs but in 6-pin μDFN package - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Suitable for thermally demanding environments where 4-pin SC70 may exceed junction temperature limits | Select MAX6389LT44D3-T when board layout allows larger package and thermal dissipation is prioritized over size |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, push-pull output - no auxiliary input, higher 8μA ICC at 1.8V | Lacks dual-rail monitoring; suited for single-rail systems where RESET IN functionality is unnecessary | Choose TPS3808G33DBVR only if 3.3V threshold matches system requirement and auxiliary monitoring is not needed |
Compared with MAX6389XS44D3-T, the MAX6389LT44D3-T offers identical supervision functionality in a thermally superior but larger package, while the TPS3808G33DBVR provides simpler single-rail supervision at higher quiescent current and without auxiliary input capability - making MAX6389XS44D3-T optimal for compact dual-voltage designs requiring ultra-low power.
Availability
MAX6389XS44D3-T is available at Aetrix Electronics and suitable for automotive body control modules, portable medical instruments, industrial PLC I/O modules, and dual-voltage embedded controllers requiring stable component supply across extended temperature ranges.
Supply support for MAX6389XS44D3-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 computing applications, with emphasis on reliability, low power, and integration.
The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor reset circuits optimized for space-constrained, battery-sensitive, and automotive-grade systems requiring high-accuracy voltage monitoring and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6389XS44D3-T and how stable is it over temperature?
The MAX6389XS44D3-T has a factory-set nominal reset threshold of 4.38V, with guaranteed limits of 4.27V (min) and 4.48V (max) at +25°C. Over the full –40°C to +125°C operating range, the threshold remains within ±2.5% of nominal (i.e., 4.27V to 4.48V), with a tempco of 60ppm/°C - verified by design and production-tested per Maxim's specifications.
Does MAX6389XS44D3-T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6389XS44D3-T supports dual-voltage monitoring via its dedicated RESET IN pin, which connects to an internal comparator referenced to a precise 1.27V bandgap. To supervise a second rail (e.g., 3.3V or 2.5V), apply the rail voltage through a resistor divider to RESET IN so that the divided voltage equals 1.27V at the desired trip point - enabling fully independent supervision of VCC and auxiliary supplies.
What is the function of the RESET output on MAX6389XS44D3-T and what external components are required?
The RESET output of MAX6389XS44D3-T is an open-drain active-low signal requiring an external pullup resistor to a valid logic-high voltage (e.g., 3.3V or 5V). When asserted, it pulls low to signal reset condition; when deasserted, it floats high. No pullup is integrated - typical values range from 10kΩ to 100kΩ depending on bus capacitance and drive strength requirements.
How does MAX6389XS44D3-T behave during severe supply voltage droop, and down to what VCC level does it remain functional?
MAX6389XS44D3-T guarantees correct RESET output logic state down to VCC = 1.0V, ensuring reliable reset assertion even during deep brownout events. Its internal circuitry remains operational and the reset comparator continues functioning until VCC falls below 1.0V - enabling controlled system shutdown before complete power loss.
Is MAX6389XS44D3-T qualified for automotive applications, and what evidence supports this claim?
Yes, MAX6389XS44D3-T is AEC-Q100 qualified for automotive use. The "/V" suffix denotes automotive qualification, and the device is specified for –40°C to +125°C operation with guaranteed ±2.5% reset threshold accuracy across that range - meeting stringent automotive reliability and parametric stability requirements as documented in Maxim's official ordering information and data sheet.
MAX6389XS44D3-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:
- Obsolete
- 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-T FAQ
1.How can I place an order for MAX6389XS44D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS44D3-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 MAX6389XS44D3-T reliable?
The price and inventory of MAX6389XS44D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS44D3-T is usually 5 days.
3.What payment methods are accepted for MAX6389XS44D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS44D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS44D3-T?
MAX6389XS44D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS44D3-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 MAX6389XS44D3-T?
For technical support, including MAX6389XS44D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS44D3-T requirements.
6.How does Aetrix verify that MAX6389XS44D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS44D3-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 MAX6389XS44D3-T meets industry standards.
7.What is the process for return or replacement of MAX6389XS44D3-T?
All MAX6389XS44D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS44D3-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 MAX6389XS44D3-T part is unused and in its original packaging.
Return procedure for MAX6389XS44D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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