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Analog Devices Inc./Maxim Integrated MAX6390XS26D4
- Part No.:
- MAX6390XS26D4
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS26D4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,630
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Product details
Overview
The MAX6390XS26D4 from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.63V VCC reset threshold (±2.5% over -40°C to +125°C), 1120ms VCC reset timeout, and 140ms manual reset timeout. It operates from 1.0V to 5.5V supply, draws only 3µA at 1.8V, and guarantees valid reset state down to VCC = 1V - used in battery-powered embedded controllers for reliable power-on/brownout detection.
For engineers reviewing the MAX6390XS26D4 datasheet, MAX6390XS26D4 pinout, MAX6390XS26D4 application, or MAX6390XS26D4 equivalent, key selection considerations include its dual timeout timing (VCC vs. MR), 4-pin SC70 package, ±2.5% threshold accuracy over temperature, open-drain output requiring external pull-up, and internal 1.56kΩ MR pullup resistor - critical for space-constrained portable systems requiring precise reset control under varying supply conditions.
Technical Context
The MAX6390XS26D4 implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.63V threshold, with hysteresis and negative-going transient immunity up to 35µs at 100mV overdrive. Its internal timer generates two distinct timeout periods: a long 1120ms VCC reset assertion after supply recovery and a short 140ms manual reset assertion after MR release.
It features an active-low manual reset input (MR) with integrated 1.56kΩ pullup to VCC, enabling direct switch-to-ground connection without external components. The open-drain RESET output requires an external pull-up resistor and remains valid down to VCC = 1V, ensuring deterministic reset signaling during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±2.5% (–40°C to +125°C); ensures accurate brownout detection across industrial temperature range |
| VCC Reset Timeout | 1120ms minimum; guarantees µP remains held in reset long enough for stable power rail recovery |
| Manual Reset Timeout | 140ms minimum; provides fast, debounced system reset without external RC timing |
| Supply Current | 3µA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Operating Voltage Range | 1.0V to 5.5V; supports single-supply operation from Li-ion, alkaline, or regulated 1.8V/3.3V rails |
| RESET Output Type | Open-drain active-low; allows wired-OR configuration and level translation with external pull-up |
| MR Pullup Resistance | 1.56kΩ internal; eliminates need for external pullup and enables direct pushbutton interface |
Pinout & Package
MAX6390XS26D4 is housed in a 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.5mm, with wettable flanks and lead-free finish. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VCC) | Power supply input | Primary voltage monitor input; powers internal circuitry and sets reset threshold reference point |
| 2 (RESET) | Open-drain active-low reset output | Asserts low during VCC undervoltage or MR activation; requires external pull-up for logic-high state |
| 3 (MR) | Active-low manual reset input | Drives reset when pulled low; internal 1.56kΩ pullup enables NC or VCC tie-off if unused |
| 4 (GND) | Ground reference | Return path for all internal current sources and comparator references; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent timeout periods | 1120ms VCC reset + 140ms MR reset enables differentiated response to supply faults vs. user-initiated reset |
| Factory-trimmed threshold accuracy | ±2.5% over –40°C to +125°C eliminates need for external calibration in harsh environments |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive, preventing spurious resets in noisy power systems |
| Ultra-low quiescent current | 3µA at 1.8V allows integration into always-on battery-backed subsystems without significant drain |
| Valid reset down to 1V VCC | Ensures deterministic logic state on RESET pin even during deep brownout, avoiding metastability |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 1.8V LDO output; asserts open-drain RESET to MCU during battery sag below 2.63V and upon button press. Use Value: 1120ms VCC timeout prevents premature MCU wake-up before rail stabilization; 140ms MR timeout enables responsive user reset without firmware delay. | Use Scenario: DIN-rail mounted analog input module operating from 24VDC supply with local 3.3V regulation. IC Role / Device Role / Timing Role: Monitors 3.3V digital supply; triggers reset on brownout and accepts front-panel reset command via isolated optocoupler driving MR. Use Value: ±2.5% threshold tolerance ensures consistent trip point across wide ambient temperature swings; open-drain output interfaces directly with opto-isolator input. |
| Smart Meter Battery Backup | Automotive Body Control Unit |
Use Scenario: Electricity meter with supercapacitor backup maintaining RTC and memory during AC mains failure. IC Role / Device Role / Timing Role: Watches 3.0V backup rail; holds MCU in reset until capacitor recharges above 2.63V after power restoration. Use Value: 3µA supply current extends supercapacitor hold-up time; guaranteed reset validity down to 1V avoids false releases during capacitor discharge tail. | Use Scenario: Low-voltage domain (1.8V/3.3V) in BCM managing door locks, lighting, and CAN transceivers. IC Role / Device Role / Timing Role: Provides fail-safe reset to microcontroller during cold-crank (battery dip to 6V) and load-dump events. Use Value: 1.56kΩ MR pullup simplifies PCB layout for diagnostic button; SC70-4 footprint saves space in dense automotive modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR26D4 | Same 2.63V threshold and 1120ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external pull-up not needed for open-drain | Select when board already uses push-pull reset topology and MR is unnecessary |
| TPS3123E18DBVR | 2.63V threshold, 1200ms timeout, push-pull active-low, 1.6µA ICC at 1.8V, no MR input | Lower supply current but no manual reset; different pinout (SOT-23-5) and no MR terminal | Choose for ultra-low-power designs where MR is omitted and SOT-23-5 layout is acceptable |
Compared with MAX6326XR26D4 and TPS3123E18DBVR, the MAX6390XS26D4 uniquely combines open-drain output, integrated MR with 1.56kΩ pullup, and asymmetric timeouts - making it optimal for compact, manually resettable systems where level translation or wired-OR reset buses are required.
Availability
MAX6390XS26D4 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart meter battery backup circuits, and automotive body control units requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6390XS26D4 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 MAX6390XS26D4 belongs to the MAX6381–MAX6390 family of low-power µP supervisory circuits, engineered specifically for space-constrained, battery-operated systems requiring high-accuracy voltage monitoring and robust reset timing under extreme temperature and noise conditions.
FAQ
What is the exact reset threshold voltage of the MAX6390XS26D4 and how stable is it over temperature?
The MAX6390XS26D4 has a factory-set VCC reset threshold of 2.63V, specified with ±2.5% tolerance over the full industrial temperature range of –40°C to +125°C. This stability is achieved through laser-trimmed bandgap references and low-drift comparator design, eliminating the need for external calibration in applications such as automotive body controllers or outdoor industrial sensors where ambient temperature varies widely.
Does the MAX6390XS26D4 require an external pull-up resistor on the RESET pin, and why?
Yes, the MAX6390XS26D4 requires an external pull-up resistor on the RESET pin because it features an open-drain active-low output. Without the pull-up, the RESET line would float high when deasserted, risking undefined logic states. A typical 10kΩ to 100kΩ resistor to the monitored supply (e.g., 3.3V) ensures clean, noise-immune reset signaling - a key requirement in the MAX6390XS26D4's intended use in portable and automotive systems.
What are the two timeout periods supported by the MAX6390XS26D4, and how do they differ in function?
The MAX6390XS26D4 supports two distinct timeout periods: a 1120ms minimum VCC reset timeout (triggered when VCC recovers above 2.63V) and a 140ms minimum manual reset timeout (triggered after MR is released). This asymmetry allows the MAX6390XS26D4 to hold the microprocessor in reset longer during power recovery than during user-initiated reset - ensuring system stability after brownout while enabling rapid diagnostics via front-panel button.
How does the internal MR pullup resistor value of the MAX6390XS26D4 compare to other parts in the MAX6381–MAX6390 family?
The MAX6390XS26D4 features a 1.56kΩ internal pullup resistor on the MR pin, significantly lower than the 63kΩ pullup found in MAX6384/MAX6385/MAX6386. This stronger pullup improves noise immunity and ensures faster MR release timing, which directly enables the shorter 140ms manual reset timeout. This design choice makes the MAX6390XS26D4 uniquely suited for applications requiring fast, reliable manual reset without external components.
Can the MAX6390XS26D4 operate reliably when VCC drops below 1.8V, and what is its minimum functional supply voltage?
Yes, the MAX6390XS26D4 guarantees correct RESET output logic state down to VCC = 1.0V, and its absolute minimum operating voltage is 1.0V per specifications. It continues to monitor VCC and assert reset correctly even as supply decays - critical for battery-powered devices like wireless sensors where the supply may sag to 1.1V before shutdown. This behavior is explicitly validated and documented for the MAX6390XS26D4 in its electrical characteristics table.
MAX6390XS26D4 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:
- 2.63V
- 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
MAX6390XS26D4 FAQ
1.How can I place an order for MAX6390XS26D4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS26D4 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 MAX6390XS26D4 reliable?
The price and inventory of MAX6390XS26D4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS26D4 is usually 5 days.
3.What payment methods are accepted for MAX6390XS26D4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS26D4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS26D4?
MAX6390XS26D4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS26D4 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 MAX6390XS26D4?
For technical support, including MAX6390XS26D4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS26D4 requirements.
6.How does Aetrix verify that MAX6390XS26D4 is sourced from the original manufacturer or authorized distributors?
All MAX6390XS26D4 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 MAX6390XS26D4 meets industry standards.
7.What is the process for return or replacement of MAX6390XS26D4?
All MAX6390XS26D4 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS26D4, 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 MAX6390XS26D4 part is unused and in its original packaging.
Return procedure for MAX6390XS26D4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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