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Analog Devices Inc./Maxim Integrated MAX6389XS22D3-T
- Part No.:
- MAX6389XS22D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS22D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,226
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Product details
Overview
MAX6389XS22D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.19V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in battery-powered or embedded systems.
For engineers reviewing the MAX6389XS22D3-T datasheet, MAX6389XS22D3-T pinout, MAX6389XS22D3-T application, or MAX6389XS22D3-T equivalent, key selection criteria include its 2.19V threshold accuracy, 140ms VCC reset delay, open-drain output requiring external pullup, RESET IN comparator referenced to +1.27V, and guaranteed operation down to VCC = 1V.
Technical Context
The MAX6389XS22D3-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.19V threshold while simultaneously accepting an external voltage at RESET IN for secondary supply supervision. Its internal timer ensures reset remains asserted for ≥140ms after VCC recovers above threshold.
RESET IN compares input voltage to a stable +1.27V internal reference; reset triggers if either VCC < 2.19V or RESET IN < 1.27V. The open-drain output supports wired-OR configurations and level-shifting, with VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.5V) and leakage ≤ 1.0µA when deasserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (nominal), ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 140ms (min) - guarantees sufficient processor hold time during power recovery |
| RESET Output Type | Open-drain active-low - enables flexible bus interfacing and level translation with external pullup |
| RESET IN Threshold | +1.27V (±2.5% over temp) - allows user-defined secondary voltage monitoring via resistor divider |
| VCC Supply Current | 3µA at +1.8V - enables multi-year operation in coin-cell–powered devices |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| Reset Propagation Delay | 4.5µs (RESET IN to RESET) - provides fast response to auxiliary supply faults |
Pinout & Package
MAX6389XS22D3-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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node; operates from 1.0V to 5.5V |
| 2 | RESET | Open-drain active-low reset output; requires external pullup resistor for logic-high state |
| 3 | RESET IN | Auxiliary voltage input monitored against +1.27V internal reference; high-impedance (≤50nA leakage) |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring capability | Simultaneous VCC and RESET IN supervision enables robust dual-rail systems (e.g., core/I/O supplies) |
| Factory-trimmed reset threshold | 2.19V ±2.5% over full temperature range eliminates need for external calibration components |
| Low quiescent current | 3µA at 1.8V allows integration into always-on battery backup circuits without significant drain |
| Guaranteed reset validity down to 1V | Ensures deterministic behavior during deep undervoltage events before complete power collapse |
| Negative-going transient immunity | Rejects short VCC glitches (e.g., <1µs at 100mV overdrive), reducing false resets in noisy environments |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless sensor node powered by a CR2032 coin cell monitors environmental parameters and transmits data intermittently. IC Role / Device Role / Timing Role: MAX6389XS22D3-T supervises both the 3.0V main rail and 1.8V MCU core rail via RESET IN, asserting reset if either drops below threshold during cold start or battery sag. Use Value: 3µA supply current extends battery life beyond 5 years; 140ms timeout ensures reliable MCU initialization after wake-up from deep sleep. | Use Scenario: An industrial programmable logic controller uses separate 24V DC-to-5V and 5V-to-3.3V regulators to power logic and analog I/O sections. IC Role / Device Role / Timing Role: MAX6389XS22D3-T monitors the 3.3V logic rail (VCC) and 5V analog rail (via RESET IN divider), triggering system-wide reset if either fails. Use Value: Dual-threshold supervision prevents partial operation; ±2.5% threshold accuracy ensures consistent trip points across -40°C to +85°C operating range. |
| Automotive Body Control Module | Medical Portable Diagnostic Device |
Use Scenario: A BCM receives 12V battery input regulated to 5.0V and 3.3V rails, requiring fault-tolerant reset generation under load dump or cold-crank conditions. IC Role / Device Role / Timing Role: MAX6389XS22D3-T's 2.19V VCC threshold detects 3.3V rail collapse, while RESET IN monitors 5.0V rail; open-drain output interfaces directly with CAN transceiver reset pin. Use Value: AEC-Q100 qualified variant available; negative-transient immunity prevents spurious resets during alternator switching noise. | Use Scenario: A handheld ultrasound device uses lithium-polymer battery with buck-boost regulator delivering 3.6V and LDOs generating 1.2V (core) and 2.8V (analog). IC Role / Device Role / Timing Role: MAX6389XS22D3-T supervises the 2.8V analog rail (VCC) and 3.6V main rail (via RESET IN), ensuring analog subsystem resets before digital logic during power-up. Use Value: 140ms timeout aligns with ADC/DAC stabilization time; guaranteed operation down to VCC = 1V prevents latch-up during rapid discharge events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT22D3-T | Same electrical specs but in 6-pin μDFN package (1.5mm × 1.5mm); higher thermal resistance (θJA = 477°C/W) | Better suited for space-constrained PCBs where 4-pin SC70 footprint is unavailable; requires different land pattern | Select when board layout favors smaller footprint or thermal management permits higher junction temperature rise |
| TPS3808G33DBVR | Fixed 3.3V threshold (not 2.19V); push-pull active-low output; no RESET IN input; 350ms min timeout | Lacks dual-supply monitoring; requires external RC network for adjustable timeout; not suitable for sub-3.3V systems | Choose only if system uses 3.3V-only rail and does not require auxiliary voltage supervision or low-threshold detection |
Compared with MAX6389LT22D3-T, the MAX6389XS22D3-T offers identical functionality in a larger but more manufacturable 4-pin SC70 package with lower thermal resistance; versus TPS3808G33DBVR, it provides critical 2.19V threshold accuracy, dual-rail capability, and ultra-low 3µA current-making it irreplaceable in battery-sensitive, multi-rail designs.
Availability
MAX6389XS22D3-T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, automotive body control units, and portable medical diagnostics requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6389XS22D3-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 microprocessor-based systems where reliability under brownout, dual-rail failure, or battery depletion is mission-critical.
FAQ
What is the exact reset threshold voltage of MAX6389XS22D3-T and how accurate is it over temperature?
The MAX6389XS22D3-T has a factory-set VCC reset threshold of 2.19V (nominal), with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet, where VTH min/max values are listed as 2.13V and 2.24V at +25°C, and 2.13V to 2.24V across temperature. The MAX6389XS22D3-T maintains this tolerance without external calibration.
Does MAX6389XS22D3-T support monitoring of a second voltage rail, and how is it implemented?
Yes, the MAX6389XS22D3-T supports dual-voltage monitoring via its dedicated RESET IN pin. This input compares the applied voltage to an internal +1.27V reference; reset asserts if either VCC falls below 2.19V or RESET IN falls below 1.27V. To set a custom threshold (e.g., 5.0V), connect RESET IN to the center tap of a resistor divider between the target rail and ground, using R1 = R2 × ((VINTH/1.27V) − 1). The MAX6389XS22D3-T's RESET IN input draws ≤50nA, enabling high-impedance divider designs.
What is the function of the RESET output on MAX6389XS22D3-T, and what external components are required?
The RESET output of the MAX6389XS22D3-T is an open-drain active-low signal, meaning it pulls low during reset and floats high otherwise. Because it cannot actively drive high, an external pullup resistor to the host system's logic rail (e.g., 10kΩ to 3.3V) is mandatory. This configuration allows wired-OR connection with other reset sources and level translation between different voltage domains. The MAX6389XS22D3-T specifies VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.5V) and leakage ≤ 1.0µA when deasserted.
What is the minimum reset timeout period for MAX6389XS22D3-T, and how is it determined?
The MAX6389XS22D3-T has a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This value is factory-programmed and guaranteed over temperature (−40°C to +125°C). The timeout begins when VCC rises above the 2.19V threshold and ends when the RESET output deasserts. The datasheet confirms tRP = 140ms (min) for D3, with typical value of 280ms. No external components affect this timing-it is fully internal and temperature-compensated.
Is MAX6389XS22D3-T suitable for automotive applications, and what qualification does it carry?
The MAX6389XS22D3-T itself is not automotive-qualified; however, the MAX6389XS22D3/V+T variant (with "/V" suffix) is AEC-Q100 Grade 2 qualified (−40°C to +105°C ambient) and RoHS-compliant. The base MAX6389XS22D3-T operates from −40°C to +125°C and shares identical electrical specifications, making it suitable for industrial and extended-temperature commercial use. For automotive deployment, engineers must specify the /V version-MAX6389XS22D3/V+T-to meet vehicle-grade reliability and qualification requirements.
MAX6389XS22D3-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:
- 2.19V, 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
MAX6389XS22D3-T FAQ
1.How can I place an order for MAX6389XS22D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS22D3-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 MAX6389XS22D3-T reliable?
The price and inventory of MAX6389XS22D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS22D3-T is usually 5 days.
3.What payment methods are accepted for MAX6389XS22D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS22D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS22D3-T?
MAX6389XS22D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS22D3-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 MAX6389XS22D3-T?
For technical support, including MAX6389XS22D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS22D3-T requirements.
6.How does Aetrix verify that MAX6389XS22D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS22D3-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 MAX6389XS22D3-T meets industry standards.
7.What is the process for return or replacement of MAX6389XS22D3-T?
All MAX6389XS22D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS22D3-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 MAX6389XS22D3-T part is unused and in its original packaging.
Return procedure for MAX6389XS22D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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