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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:2,929
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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. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, targeting battery-powered embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6389XS22D3+T datasheet, MAX6389XS22D3+T pinout, MAX6389XS22D3+T application, or MAX6389XS22D3+T equivalent, key selection criteria include its open-drain reset configuration, 2.19V threshold accuracy, 140ms timeout, dual-supply monitoring capability via RESET IN, and 4-pin SC70 package compatibility with space-constrained designs.
Technical Context
The MAX6389XS22D3+T integrates a precision voltage comparator for VCC monitoring and a separate +1.27V reference-based comparator for the RESET IN pin, enabling independent monitoring of two power rails. Its internal timer guarantees reset assertion for ≥140ms after VCC or RESET IN recovers above their respective thresholds.
It features negative-going VCC transient immunity up to 35µs at 100mV overdrive, guaranteed valid reset output down to VCC = 1V, and an internal 50nA max leakage RESET IN input - allowing high-impedance resistor-divider networks for user-adjustable thresholds without accuracy loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.19V (nominal), ±2.5% over -40°C to +125°C - ensures stable reset activation across automotive/industrial temperature ranges |
| Reset Timeout Period | 140ms (minimum) - provides sufficient hold time for microprocessor initialization sequences |
| RESET Output Type | Open-drain active-low - requires external pullup; enables wired-OR reset bus configurations |
| RESET IN Threshold | 1.27V (internal reference), ±0.026V over -40°C to +125°C - supports accurate secondary rail monitoring via external resistor divider |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage Range | 1.0V to 5.5V - supports direct interface with core logic supplies (1.2V, 1.8V, 3.3V, 5V) |
| Reset Propagation Delay | 4.5µs (RESET IN to RESET) - ensures fast response to auxiliary rail 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, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets reset threshold reference |
| 2 | RESET (open-drain) | Active-low reset signal output; must be pulled up externally; asserts low during VCC or RESET IN fault |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to internal 1.27V reference; enables dual-rail supervision without additional ICs |
| 4 | GND | Analog and digital ground reference; required for accurate comparator operation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC and external rail via RESET IN - eliminates need for second supervisor in dual-supply systems |
| User-adjustable auxiliary threshold | RESET IN accepts resistor-divider network; threshold set by VINTH = 1.27V × (R1/R2 + 1) - enables precise custom reset points |
| Negative-going VCC transient immunity | Rejects glitches ≤35µs wide at 100mV overdrive - prevents spurious resets in noisy power environments |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in portable medical monitors and wireless sensor nodes |
| Guaranteed operation down to VCC = 1V | Valid reset state maintained even as supply collapses - ensures safe shutdown sequencing |
Applications
| Battery-Powered IoT Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Supervises both 3.3V MCU supply and 1.8V sensor analog front-end in a wireless environmental monitor powered by CR2032. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting open-drain reset to MCU and sensor ASIC when either rail drops below threshold. Use Value: Prevents corrupted sensor data logging during brownout by holding MCU in reset until both supplies stabilize for ≥140ms. | Use Scenario: Monitors 5V infotainment system supply and 3.3V CAN transceiver supply in a vehicle door module. IC Role / Device Role / Timing Role: Resets microcontroller only when both main and communication rails are valid, avoiding partial initialization failures. Use Value: Eliminates need for discrete comparators and timers, reducing BOM count and PCB area in AEC-Q100–qualified designs. |
| Industrial PLC I/O Expansion Card | Medical Point-of-Care Diagnostic Device |
Use Scenario: Ensures reliable startup of FPGA-based I/O controller after hot-swap insertion into backplane with variable supply ramp rates. IC Role / Device Role / Timing Role: Provides programmable 140ms reset hold-off while monitoring both 2.5V FPGA core and 3.3V I/O banks. Use Value: Guarantees FPGA configuration completes before peripheral enable signals activate, preventing metastability. | Use Scenario: Supervises 1.2V processor core and 2.8V display backlight driver in a handheld ultrasound probe. IC Role / Device Role / Timing Role: Generates synchronized reset pulse only after both critical rails exceed thresholds, using open-drain output for shared reset bus. Use Value: Meets IEC 60601-1 safety requirements for fail-safe power sequencing in battery-operated medical equipment. |
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); no SC70 footprint compatibility | Preferred for higher thermal dissipation or tighter layout constraints where μDFN is acceptable | Select when board space allows larger package and improved θJA (477°C/W vs. 322.6°C/W for SC70) |
| TPS3808G33DBVR | Fixed 3.3V threshold; push-pull active-low reset; 200ms timeout; 1.4μA typical ICC at 3.3V | Lacks auxiliary RESET IN input; not suitable for dual-rail monitoring | Choose only for single-rail 3.3V systems where lower current and TI supply chain preference outweigh dual-monitoring need |
Compared with MAX6389XS22D3+T, the LT22D3 variant offers identical functionality in a thermally superior but physically larger μDFN package, while TPS3808G33DBVR provides lower quiescent current but sacrifices dual-supply monitoring - making MAX6389XS22D3+T uniquely suited for compact, dual-rail battery-powered designs.
Availability
MAX6389XS22D3+T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, automotive body control modules, industrial PLC I/O cards, and medical point-of-care devices requiring stable component supply and long-term lifecycle support.
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 microprocessor supervisors with flexible reset configurations and dual-voltage monitoring - engineered specifically for space- and power-constrained embedded systems requiring robust power-on reset and brownout protection.
FAQ
What is the exact reset threshold voltage of MAX6389XS22D3+T?
The MAX6389XS22D3+T has a factory-set VCC reset threshold of 2.19V (nominal), with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is derived from the "22" suffix in the part number per Maxim's Reset Threshold table, where "22" corresponds to 2.13V (min), 2.19V (nom), and 2.24V (max).
Does MAX6389XS22D3+T support monitoring of two independent power supplies?
Yes, MAX6389XS22D3+T supports dual-supply monitoring: VCC is monitored against its 2.19V threshold, and the RESET IN pin monitors a second voltage against an internal +1.27V reference. When either falls below its threshold, the open-drain RESET output asserts low - enabling single-chip supervision of core and I/O rails.
What is the function of the RESET IN pin on MAX6389XS22D3+T?
The RESET IN pin on MAX6389XS22D3+T is a high-impedance input to a dedicated comparator referenced to +1.27V. It allows user-defined reset thresholds via an external resistor divider. For example, connecting R1=100kΩ and R2=100kΩ sets a 2.54V threshold (1.27V × (100k/100k + 1)). Leakage current is ≤50nA, preserving accuracy with high-value resistors.
What package type and dimensions does MAX6389XS22D3+T use?
MAX6389XS22D3+T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm pin pitch. It is RoHS-compliant (+T suffix), rated for -40°C to +125°C operation, and features thermal resistance θJA = 322.6°C/W on multilayer boards.
Is MAX6389XS22D3+T pin-compatible with other members of the MAX6381–MAX6390 family?
Yes, MAX6389XS22D3+T shares identical 4-pin SC70 pinout with all XS-suffix variants (e.g., MAX6384XSxxDx+T, MAX6387XSxxDx+T). Pin 1 = VCC, Pin 2 = RESET, Pin 3 = RESET IN, Pin 4 = GND - enabling drop-in replacement within the same package format and functional subset (open-drain + RESET IN).
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:
- Active
- 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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