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Analog Devices Inc./Maxim Integrated MAX6390XS22D4
- Part No.:
- MAX6390XS22D4
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS22D4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:6,562
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Product details
Overview
MAX6390XS22D4 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), 1120ms VCC reset timeout, and 140ms manual reset timeout. It monitors single-supply systems in battery-powered instrumentation and embedded controllers where reliable power-on reset and brownout protection are critical.
For engineers reviewing the MAX6390XS22D4 datasheet, MAX6390XS22D4 pinout, MAX6390XS22D4 application, or MAX6390XS22D4 equivalent, key selection factors include its 3µA supply current at 1.8V, guaranteed reset validity down to VCC = 1V, 1.56kΩ internal MR pullup resistor, and SC70-4 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6390XS22D4 implements a precision bandgap-based voltage comparator for VCC monitoring and a monolithic timer for reset assertion timing. Its open-drain RESET output requires an external pullup and remains asserted low during VCC undervoltage or MR activation, then holds for the full 1120ms timeout after recovery.
Unlike earlier family members, MAX6390XS22D4 features asymmetric timing: VCC-initiated reset persists for 1120ms minimum, while manual reset via MR deasserts after only 140ms - enabling faster user-triggered recovery without compromising power-up stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.19V ±2.5% (factory-set; ensures reliable detection of 2.2V supply brownout) |
| VCC Reset Timeout | 1120ms min (guarantees µP initialization completes before release) |
| MR Reset Timeout | 140ms min (enables rapid manual recovery without system hang) |
| Supply Current | 3µA at +1.8V (extends battery life in portable equipment) |
| Operating Voltage | 1.0V to 5.5V (supports operation down to near-dead-battery conditions) |
| MR Pullup Resistor | 1.56kΩ (low-value internal pullup enables robust noise immunity on MR line) |
| Reset Output Type | Open-drain active-low (allows wired-OR reset bus sharing with other supervisors) |
Pinout & Package
MAX6390XS22D4 is housed in a 4-pin SC70 package (package code X4-1), measuring 1.5mm × 1.0mm × 0.8mm, with wettable flanks for automated optical inspection. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and monitored voltage source for fixed-threshold reset detection |
| 2 | RESET | Open-drain active-low output requiring external pullup; asserts low during fault or MR activation |
| 3 | MR | Active-low manual reset input with 1.56kΩ internal pullup to VCC; debounced internally |
| 4 | GND | Ground reference for all internal circuitry and reset comparator |
Key Features
| Feature | Design Value |
|---|---|
| Asymmetric reset timing | 1120ms VCC timeout / 140ms MR timeout enables fast user recovery without sacrificing power-up reliability |
| Low-voltage operation | Guaranteed reset assertion down to VCC = 1.0V supports ultra-low-power brownout detection |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches below threshold - prevents spurious resets in noisy environments |
| Factory-trimmed threshold | ±2.5% accuracy over -40°C to +125°C eliminates need for external calibration components |
| SC70-4 footprint | 1.5mm × 1.0mm size reduces board area by >50% vs. SOIC-8 alternatives while maintaining hand-solderability |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable ECG sensor operating from coin-cell battery with variable discharge curve. IC Role / Device Role / Timing Role: Monitors VCC to assert reset if voltage drops below 2.19V during deep discharge, holding reset for 1120ms to ensure clean MCU boot. Use Value: Prevents corrupted memory writes and firmware lockup when battery voltage sags transiently under RF transmission load. | Use Scenario: LoRaWAN end-node cycling between sleep (300nA) and transmit (25mA) states. IC Role / Device Role / Timing Role: Provides deterministic power-on reset and detects brownout during wake-up surge; MR pin allows OTA firmware reset command. Use Value: Eliminates need for external RC reset network, reducing BOM count and improving timing consistency across temperature. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted sensor interface module powered from 24VDC converted to 3.3V. IC Role / Device Role / Timing Role: Supervises 3.3V rail; open-drain RESET ties into shared system reset bus with other modules. Use Value: Wired-OR capability allows centralized reset arbitration without additional logic; 1.56kΩ MR pullup rejects EMI-induced false triggers. | Use Scenario: Door module with LIN transceiver and microcontroller powered from vehicle battery (9–16V). IC Role / Device Role / Timing Role: Monitors post-regulator 5V supply; 140ms MR timeout enables quick diagnostic reset after LIN bus fault recovery. Use Value: Shorter manual reset duration avoids unnecessary delay in re-enabling safety-critical functions after operator intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR22D4 | Same 2.19V threshold and 1120ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external MR circuitry if user-initiated reset needed | Select when board space permits larger SC70-3 package and MR functionality is unnecessary |
| TLV803EB22DBZR | 2.2V threshold (±1%), 140ms timeout, SOT-23-3 package, no MR pin | Shorter timeout and no manual reset; lower supply current (0.5µA) but narrower temp range (-40°C to +105°C) | Choose for ultra-low-power applications where 1120ms VCC timeout is not required and MR is unused |
Compared with MAX6326XR22D4 and TLV803EB22DBZR, MAX6390XS22D4 uniquely combines long VCC reset hold time (1120ms), short MR timeout (140ms), and integrated 1.56kΩ pullup - making it optimal for battery-operated systems needing both robust power-up sequencing and responsive user reset.
Availability
MAX6390XS22D4 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6390XS22D4 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.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor-based systems where supply integrity directly impacts functional safety and data reliability.
FAQ
What is the exact reset threshold voltage of MAX6390XS22D4?
The MAX6390XS22D4 has a factory-set VCC reset threshold of 2.19V, with ±2.5% tolerance over the full operating temperature range of -40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet (suffix '22'), and applies specifically to the MAX6390XS22D4 variant - not inferred from adjacent thresholds or family averages.
Does MAX6390XS22D4 support manual reset, and what is its timing behavior?
Yes, MAX6390XS22D4 includes a dedicated MR (manual reset) input with an internal 1.56kΩ pullup resistor. When MR is pulled low, MAX6390XS22D4 asserts reset and holds it for a minimum of 140ms after MR returns high - significantly shorter than its 1120ms VCC-initiated timeout, enabling rapid user-triggered recovery without compromising power-up stability.
What package type and dimensions does MAX6390XS22D4 use?
MAX6390XS22D4 is packaged in a 4-pin SC70 (X4-1) outline, measuring 1.5mm × 1.0mm × 0.8mm with wettable flanks. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND. This compact footprint is verified in the Pin Configurations section and Package Information tables of the official datasheet.
Can MAX6390XS22D4 operate reliably at very low supply voltages?
Yes, MAX6390XS22D4 guarantees correct reset output state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal comparator and timer remain functional across the full 1.0V to 5.5V operating range, making it suitable for applications with deeply discharged batteries or low-dropout regulator outputs.
How does the open-drain RESET output of MAX6390XS22D4 differ from push-pull variants in the same family?
The open-drain RESET output of MAX6390XS22D4 requires an external pullup resistor and enables wired-OR connection with other reset sources on a shared bus - unlike push-pull versions (e.g., MAX6381/MAX6382) that drive both high and low actively. This architecture prevents bus contention and simplifies multi-supervisor system design, as explicitly documented in the Pin Description and Features sections.
MAX6390XS22D4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.19V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6390XS22D4 FAQ
1.How can I place an order for MAX6390XS22D4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS22D4 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 MAX6390XS22D4 reliable?
The price and inventory of MAX6390XS22D4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS22D4 is usually 5 days.
3.What payment methods are accepted for MAX6390XS22D4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS22D4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS22D4?
MAX6390XS22D4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS22D4 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 MAX6390XS22D4?
For technical support, including MAX6390XS22D4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS22D4 requirements.
6.How does Aetrix verify that MAX6390XS22D4 is sourced from the original manufacturer or authorized distributors?
All MAX6390XS22D4 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 MAX6390XS22D4 meets industry standards.
7.What is the process for return or replacement of MAX6390XS22D4?
All MAX6390XS22D4 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS22D4, 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 MAX6390XS22D4 part is unused and in its original packaging.
Return procedure for MAX6390XS22D4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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