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Analog Devices Inc./Maxim Integrated MAX6389XS29D2+T
- Part No.:
- MAX6389XS29D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS29D2+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,462
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Product details
Overview
MAX6389XS29D2+T from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit designed for dual-voltage monitoring in embedded systems. It features a factory-set VCC reset threshold of 2.93V (min), 3.00V (nom), 3.08V (max), a 20ms minimum reset timeout, and auxiliary RESET IN input for secondary voltage monitoring. It operates across -40°C to +125°C and consumes only 3μA at 1.8V, making it suitable for battery-powered instrumentation and automotive-grade power sequencing.
For engineers reviewing the MAX6389XS29D2+T datasheet, MAX6389XS29D2+T pinout, MAX6389XS29D2+T application, or MAX6389XS29D2+T equivalent, key selection criteria include its open-drain active-low reset output, ±2.5% reset threshold accuracy over temperature, guaranteed valid reset state down to VCC = 1V, and support for dual-supply monitoring via RESET IN comparator referenced to 1.27V.
Technical Context
The MAX6389XS29D2+T implements a precision bandgap-based reset comparator for VCC with ±2.5% accuracy from -40°C to +125°C and a separate high-impedance RESET IN input compared against an internal 1.27V reference. Its open-drain RESET output requires an external pullup and remains asserted low for ≥20ms after VCC or RESET IN recovers above their respective thresholds.
It supports dual-supply monitoring without external components beyond the resistor divider on RESET IN, and guarantees correct logic state for VCC ≥ 1V - critical for brownout detection in low-voltage core/I/O domains. Negative-going VCC transient immunity is characterized up to 35µs for 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (min) / 3.00V (nom) / 3.08V (max) - factory-trimmed for precise 3.0V system monitoring |
| Reset Timeout Period | 20ms (min) - ensures sufficient hold time for μP initialization after power recovery |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered devices |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level translation with external pullup |
| RESET IN Threshold | 1.245V to 1.295V (±2.5% over temp) - enables user-adjustable secondary reset via resistor divider |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial environments |
| VCC Range | 1.0V to 5.5V - supports monitoring of core voltages as low as 1.0V while remaining functional |
Pinout & Package
MAX6389XS29D2+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. Pin 1 = VCC, Pin 2 = RESET (open-drain active-low), Pin 3 = GND, Pin 4 = RESET IN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Primary supply input and monitored rail | Power source and main reset trigger point; supports 1.0V–5.5V operation |
| 2 - RESET | Open-drain active-low reset output | Drives low during fault; requires external pullup; sinks ≥1.2mA at VCC ≥ 2.5V |
| 3 - GND | Analog and digital ground reference | Common return path for all internal comparators and output stage |
| 4 - RESET IN | Auxiliary voltage monitor input | High-impedance (≤50nA leakage) node compared to 1.27V internal reference; sets secondary reset threshold via R-divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset monitoring | Simultaneously watches VCC and external rail via RESET IN - eliminates need for second supervisor IC |
| Factory-trimmed reset threshold | ±2.5% accuracy over full -40°C to +125°C range - reduces calibration overhead in production |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in portable medical and sensor nodes |
| Valid reset output down to VCC = 1V | Ensures deterministic behavior during deep brownout - prevents spurious release before stable power |
| Negative-going transient immunity | Rejects <35µs glitches at 100mV overdrive - improves robustness in noisy automotive power nets |
Applications
| Industrial Power Sequencing | Automotive Body Control Module |
|---|---|
Use Scenario: Coordinating startup of FPGA, MCU, and analog front-end in programmable logic controllers with multiple regulated rails. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting reset until both 3.3V I/O and 1.2V core supplies stabilize within tolerance. Use Value: Prevents metastability and latch-up by enforcing strict power-up order and timing margins per JEDEC JESD84-B51. | Use Scenario: Monitoring 3.0V microcontroller supply and 5V LIN transceiver rail in door module ECUs. IC Role / Device Role / Timing Role: Primary reset generator with auxiliary RESET IN tied to LIN regulator output via resistor divider. Use Value: Enables single-chip dual-supply supervision meeting ISO 16750-2 pulse 4a/b requirements without discrete comparators. |
| Portable Medical Sensor Hub | Battery-Powered IoT Node |
Use Scenario: Ensuring reliable boot of ARM Cortex-M0+ in wearable ECG patch powered by CR2032 cell. IC Role / Device Role / Timing Role: Low-current supervisor monitoring 3.0V LDO output and enabling wake-on-reset functionality. Use Value: 3μA supply current extends operational lifetime beyond 2 years; 20ms timeout accommodates slow LDO settling. | Use Scenario: Supervising 2.8V BLE SoC and 3.3V sensor interface in LoRaWAN end-node. IC Role / Device Role / Timing Role: Dual-threshold detector using RESET IN to monitor backup supercap voltage alongside main rail. Use Value: Eliminates need for external voltage divider and comparator, reducing BOM count and PCB area by 35%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT29D2+T | Same electrical specs but in 6-pin µDFN (L611+1) instead of 4-pin SC70; includes NC pins | Requires different footprint and land pattern; higher thermal resistance (θJA = 477°C/W vs. 322.6°C/W) | Select when board layout accommodates larger package or when µDFN thermal performance is acceptable |
| TPS3808G30DBVR | Active-low open-drain reset; 3.0V threshold (±0.5%); 20ms timeout; 1.4μA typical ICC at 3.3V | No auxiliary RESET IN input; single-rail only; lower supply current but no dual-monitoring capability | Choose for cost-sensitive single-supply designs where RESET IN functionality is unnecessary |
Compared with MAX6389XS29D2+T, the MAX6389LT29D2+T offers identical supervision functionality in a larger package suited for higher-power layouts, while the TPS3808G30DBVR provides tighter threshold accuracy and lower current but lacks dual-rail monitoring - making MAX6389XS29D2+T uniquely suited for space-constrained dual-voltage systems requiring minimal BOM expansion.
Availability
MAX6389XS29D2+T is available at Aetrix Electronics and suitable for industrial power sequencing, automotive body control modules, portable medical sensor hubs, and battery-powered IoT nodes requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6389XS29D2+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 reset supervision for systems requiring dual-rail monitoring, wide temperature operation, and minimal footprint - targeting next-generation edge sensors and automotive ECUs.
FAQ
What is the exact reset threshold voltage range for MAX6389XS29D2+T?
The MAX6389XS29D2+T has a factory-set VCC reset threshold of 2.93V (minimum), 3.00V (nominal), and 3.08V (maximum) at +25°C, with ±2.5% accuracy maintained over -40°C to +125°C. This corresponds to the "29" suffix in the part number and is verified in the Reset Thresholds table of the official datasheet. The MAX6389XS29D2+T uses this precise window to reliably detect brownout conditions on 3.0V rails.
Does MAX6389XS29D2+T support monitoring a second voltage rail?
Yes, MAX6389XS29D2+T includes a dedicated RESET IN pin that connects to an internal 1.27V comparator. By applying a resistor divider to this pin, users can set a custom secondary reset threshold - for example, monitoring a 5V LIN transceiver supply while the main VCC pin watches a 3.0V MCU rail. This dual-monitoring capability is intrinsic to the MAX6389XS29D2+T and eliminates the need for a second supervisor IC.
What is the function of the RESET output on MAX6389XS29D2+T?
The RESET output of MAX6389XS29D2+T is an open-drain, active-low signal. It pulls low when either VCC drops below 2.93V–3.08V or the voltage at RESET IN falls below ~1.27V, and remains low for ≥20ms after recovery. An external pullup resistor is required. This configuration allows wired-OR connection with other reset sources and supports level-shifting across voltage domains - a key design feature of the MAX6389XS29D2+T.
What package type and dimensions does MAX6389XS29D2+T use?
MAX6389XS29D2+T is supplied in a lead-free, RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. Its pinout is VCC (Pin 1), RESET (Pin 2), GND (Pin 3), and RESET IN (Pin 4). This compact footprint is optimized for space-constrained applications such as wearables and automotive sensors where the MAX6389XS29D2+T delivers dual-supply supervision in minimal area.
How does MAX6389XS29D2+T handle power supply transients?
MAX6389XS29D2+T provides built-in immunity to short negative-going VCC transients: it will not assert reset for glitches ≤35µs wide when the overdrive (VTH – VCC) is 100mV, as characterized in the Typical Operating Characteristics graph. This transient rejection is inherent to the MAX6389XS29D2+T's comparator architecture and enhances reliability in electrically noisy environments like automotive power nets or industrial motor drives.
MAX6389XS29D2+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:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6389XS29D2+T FAQ
1.How can I place an order for MAX6389XS29D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS29D2+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 MAX6389XS29D2+T reliable?
The price and inventory of MAX6389XS29D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS29D2+T is usually 5 days.
3.What payment methods are accepted for MAX6389XS29D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS29D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS29D2+T?
MAX6389XS29D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS29D2+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 MAX6389XS29D2+T?
For technical support, including MAX6389XS29D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS29D2+T requirements.
6.How does Aetrix verify that MAX6389XS29D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS29D2+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 MAX6389XS29D2+T meets industry standards.
7.What is the process for return or replacement of MAX6389XS29D2+T?
All MAX6389XS29D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS29D2+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 MAX6389XS29D2+T part is unused and in its original packaging.
Return procedure for MAX6389XS29D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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