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Analog Devices Inc./Maxim Integrated MAX6390XS26D7+T
- Part No.:
- MAX6390XS26D7+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS26D7+T.pdf
- Description:
- IC MPU/RESET CIRC 2.63V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6390XS26D7+T 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), 1200ms VCC reset timeout, and 150ms manual reset timeout. It monitors single-supply voltage in battery-powered systems and embedded controllers where reliable power-on reset and brownout protection are critical.
For engineers reviewing the MAX6390XS26D7+T datasheet, MAX6390XS26D7+T pinout, MAX6390XS26D7+T application, or MAX6390XS26D7+T equivalent, key selection criteria include its 3μA supply current at 1.8V, guaranteed reset validity down to VCC = 1V, open-drain output requiring external pullup, and dedicated MR input with 1.56kΩ internal pullup resistor - all in a space-constrained 4-pin SC70 package.
Technical Context
The MAX6390XS26D7+T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across -40°C to +125°C and 60ppm/°C tempco. Its dual-timing architecture separates VCC-initiated reset (1200ms min) from manual reset (150ms min), enabling independent system recovery control.
It features an open-drain RESET output compatible with mixed-voltage I/O domains, and a manually triggered reset input (MR) with integrated 1.56kΩ pullup - optimized for noise-immune pushbutton interfacing without external components. No auxiliary voltage monitor (RESET IN) is present in this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (nominal), ±2.5% over full temperature range - ensures accurate brownout detection for 2.7V–2.8V logic rails |
| VCC Reset Timeout | 1200ms minimum - guarantees sufficient hold time for slow-ramping power supplies or complex boot sequences |
| Manual Reset Timeout | 150ms minimum - provides fast, deterministic reset initiation independent of VCC behavior |
| 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 valid reset assertion even during deep brownout conditions down to 1V |
| Reset Output Type | Open-drain active-low - allows wired-OR configuration and level-shifting across different I/O voltage domains |
| MR Pullup Resistance | 1.56kΩ (typical) - ensures robust low-state immunity on long PCB traces while minimizing standby current |
Pinout & Package
MAX6390XS26D7+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 portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and monitored voltage source - powers internal circuitry and feeds reset comparator |
| 2 | RESET | Open-drain active-low reset output - requires external pullup; asserts low during fault or manual reset |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; drives reset when pulled to GND |
| 4 | GND | Analog/digital ground reference - must be connected to system ground plane for stable threshold operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset timeouts | 1200ms VCC timeout + 150ms MR timeout - decouples power-fail recovery from user-triggered reset timing |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in always-on monitoring applications without compromising supervision integrity |
| Guaranteed reset validity down to 1V | Ensures correct logic state on RESET pin even during severe brownout - prevents spurious releases before power stabilizes |
| Integrated MR pullup | 1.56kΩ resistor eliminates need for external component - simplifies BOM and improves noise immunity on MR line |
| Open-drain output architecture | Enables flexible interface with 1.8V/3.3V/5V systems via external pullup - supports shared reset buses in multi-rail designs |
Applications
| Portable Medical Sensors | Battery-Powered Telematics |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 2.6V LDO output; asserts reset if voltage sags below 2.63V during RF burst or cold temperature. Use Value: 3μA supply current extends operational life beyond 2 years; 1200ms timeout accommodates slow battery recovery after load transients. | Use Scenario: GPS tracker in automotive OBD-II dongle with dual 3.3V/5V rails and vibration-triggered wake-up. IC Role / Device Role / Timing Role: Monitors 3.3V microcontroller rail; manual reset input tied to tamper switch for secure firmware reinitialization. Use Value: 150ms MR timeout enables rapid, glitch-free recovery after physical intrusion detection; open-drain output interfaces cleanly with 5V-safe MCU reset pin. |
| Industrial Edge Controller | Smart Home Hub Power Management |
Use Scenario: DIN-rail mounted PLC module operating in unregulated 24VDC environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides fail-safe reset for ARM Cortex-M7 core running real-time control firmware; operates across -40°C to +125°C. Use Value: ±2.5% reset threshold accuracy over full temperature range prevents false resets in thermal cycling environments; 1V minimum VCC operation ensures reset remains valid during catastrophic rail collapse. | Use Scenario: Wi-Fi/Zigbee hub powered from USB-C PD adapter with dynamic 3.3V/5V switching and USB enumeration sequencing. IC Role / Device Role / Timing Role: Generates synchronized reset pulse to SoC and peripheral ICs upon 3.3V rail stabilization; MR input used for factory recovery mode entry. Use Value: 1200ms timeout aligns with USB PD negotiation and regulator soft-start delays; 4-pin SC70 footprint saves board area in compact enclosure designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR26D7+T | Same 2.63V threshold and 1200ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external pullup not needed for push-pull | Select when manual reset is unnecessary and board layout favors push-pull drive without external components |
| TPS3808G33DBVR | 2.93V threshold (not 2.63V), 1200ms timeout, push-pull active-low, includes MR input with 50kΩ pullup | Higher threshold unsuitable for 2.7V systems; MR pullup value differs, affecting noise margin | Choose only if system rail is ≥3.0V and compatibility with TI's ecosystem is prioritized over exact threshold match |
Compared with MAX6390XS26D7+T, MAX6326XR26D7+T removes manual reset functionality but simplifies output drive, while TPS3808G33DBVR shifts the reset threshold upward by 300mV - making it incompatible for 2.6V–2.7V supply monitoring despite matching timeout.
Availability
MAX6390XS26D7+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered telematics, industrial edge controllers, and smart home hub power management requiring stable component supply and long-term lifecycle support.
Supply support for MAX6390XS26D7+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 space-constrained and battery-sensitive systems - emphasizing reliability under extreme temperature and voltage stress.
FAQ
What is the exact reset threshold voltage of MAX6390XS26D7+T and how tightly is it specified?
The MAX6390XS26D7+T has a nominal VCC reset threshold of 2.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This corresponds to a minimum threshold of 2.56V and maximum of 2.69V at temperature extremes, ensuring robust brownout detection for 2.7V logic systems without false triggering.
Does MAX6390XS26D7+T support manual reset, and what is the internal pullup value on the MR pin?
Yes, MAX6390XS26D7+T includes a dedicated active-low manual reset (MR) input with an internal pullup resistor of 1.56kΩ (typical), significantly lower than earlier family members. This value ensures strong noise immunity on the MR line while maintaining low standby current - eliminating the need for an external pullup resistor in most designs.
What are the reset timeout periods for MAX6390XS26D7+T, and how do they differ between VCC and MR events?
MAX6390XS26D7+T provides two distinct timeout periods: a 1200ms minimum reset timeout when triggered by VCC falling below threshold, and a shorter 150ms minimum timeout when initiated by the MR input. This asymmetry allows fast user-triggered recovery while ensuring sufficient hold time for power supply stabilization during brownout conditions.
Can MAX6390XS26D7+T operate reliably at very low supply voltages, and down to what VCC level does the reset output remain valid?
Yes, MAX6390XS26D7+T is fully specified to operate down to VCC = 1.0V, and its RESET output state is guaranteed valid across this entire range. This ensures deterministic reset assertion even during deep brownout events - a critical feature for fail-safe operation in battery-depleted or unregulated power scenarios.
What package type and pin count does MAX6390XS26D7+T use, and is it RoHS-compliant?
MAX6390XS26D7+T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, and carries the "+" suffix indicating full RoHS compliance and lead-free construction. This compact, surface-mount package supports high-density layouts in portable and wearable electronics.
MAX6390XS26D7+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6390XS26D7+T FAQ
1.How can I place an order for MAX6390XS26D7+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS26D7+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 MAX6390XS26D7+T reliable?
The price and inventory of MAX6390XS26D7+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS26D7+T is usually 5 days.
3.What payment methods are accepted for MAX6390XS26D7+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS26D7+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS26D7+T?
MAX6390XS26D7+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS26D7+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 MAX6390XS26D7+T?
For technical support, including MAX6390XS26D7+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS26D7+T requirements.
6.How does Aetrix verify that MAX6390XS26D7+T is sourced from the original manufacturer or authorized distributors?
All MAX6390XS26D7+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 MAX6390XS26D7+T meets industry standards.
7.What is the process for return or replacement of MAX6390XS26D7+T?
All MAX6390XS26D7+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS26D7+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 MAX6390XS26D7+T part is unused and in its original packaging.
Return procedure for MAX6390XS26D7+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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