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Analog Devices Inc./Maxim Integrated MAX6390XS29D4-T
- Part No.:
- MAX6390XS29D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS29D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,869
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Product details
Overview
MAX6390XS29D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.93V VCC reset threshold (±2.5% over -40°C to +125°C), 1120ms VCC reset timeout, and 140ms manual reset timeout. It monitors single-supply voltage in battery-powered embedded systems and guarantees valid reset assertion down to VCC = 1V.
For engineers reviewing the MAX6390XS29D4-T datasheet, MAX6390XS29D4-T pinout, MAX6390XS29D4-T application, or MAX6390XS29D4-T equivalent, key selection considerations include its 4-pin SC70 package, 3μA supply current at 1.8V, ±2.5% reset threshold accuracy, and dedicated manual reset input with 1.56kΩ internal pullup resistor.
Technical Context
The MAX6390XS29D4-T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and guarantees correct reset logic state for VCC ≥ 1V. Its internal timer enforces fixed 1120ms minimum timeout after VCC recovery and 140ms after MR release.
Unlike earlier family members, MAX6390XS29D4-T uses a low-value 1.56kΩ internal MR pullup (vs. 63kΩ in MAX6384–MAX6386) to ensure fast, noise-immune manual reset response. It lacks RESET IN functionality and is not dual-voltage capable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across automotive temperature range |
| VCC Reset Timeout | 1120ms minimum - holds μP in reset long enough for power rails and clocks to stabilize post-brownout |
| Manual Reset Timeout | 140ms minimum - provides short, deterministic reset pulse when operator initiates reset |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Reset Output Type | Open-drain active-low - allows wired-OR configuration with other reset sources and flexible voltage-level translation |
| MR Pullup Resistance | 1.56kΩ - ensures rapid MR rise time and immunity to PCB trace capacitance in compact layouts |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion during deep brownout down to 1V before system collapse |
Pinout & Package
MAX6390XS29D4-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 space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary power supply input and monitored voltage rail - must be decoupled with 0.1μF capacitor near pin |
| 2 | RESET | Open-drain active-low reset output - requires external pullup resistor to host system's reset rail voltage |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC via 1.56kΩ resistor; driven low to force reset |
| 4 | GND | Analog and digital ground reference - must be connected to lowest-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.93V reset threshold | Eliminates external resistor divider, reducing BOM count and layout area in single-rail systems |
| 1120ms VCC reset timeout | Meets JEDEC JESD78 reliability requirements for power-up sequencing in industrial controllers |
| 140ms manual reset timeout | Prevents spurious resets from switch bounce while enabling rapid user-initiated recovery |
| 1.56kΩ internal MR pullup | Reduces MR rise time to <100ns, improving noise margin in EMI-prone environments |
| 3μA supply current at 1.8V | Extends battery life in always-on wearable devices beyond 5 years on CR2032 cell |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by lithium coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 1.8V LDO output and asserts open-drain reset to MSP430 MCU during battery voltage sag below 2.93V. Use Value: 3μA quiescent current extends operational life; 1120ms timeout prevents premature MCU wake-up before analog front-end stabilization. | Use Scenario: DIN-rail mounted remote I/O node operating in factory ambient (-40°C to +85°C). IC Role / Device Role / Timing Role: Monitors 3.3V system rail and provides fail-safe reset to ARM Cortex-M7 processor during AC line sags. Use Value: ±2.5% threshold accuracy over full temperature range ensures consistent trip point without calibration; 1.56kΩ MR pullup rejects conducted noise on control panel wiring. |
| Smart Home Hub Power Management | Automotive Body Control Module (BCM) |
Use Scenario: Wi-Fi–enabled home automation hub with dual-rail power (1.2V core, 3.3V I/O) and pushbutton reset. IC Role / Device Role / Timing Role: Provides 2.93V supervision of 3.3V I/O rail and debounced manual reset via front-panel button. Use Value: 140ms MR timeout delivers crisp user feedback without requiring external RC debounce; open-drain output interfaces cleanly with 1.8V logic reset inputs. | Use Scenario: AEC-Q100 qualified BCM monitoring 5V supply in vehicle door module. IC Role / Device Role / Timing Role: Detects undervoltage on 5V rail and asserts reset to S32K144 MCU during cranking events. Use Value: Valid operation down to VCC = 1V ensures reset remains asserted through deep battery dip; 1120ms timeout accommodates slow 5V rail recovery after engine start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR29D4+T | Same 2.93V threshold and 1120ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external pullup for reset line sharing | Select when manual reset is unnecessary and board space permits 3-pin SC70 |
| TLV803EB29DBZR | 2.93V threshold, 140ms timeout, push-pull active-low, 0.9μA ICC at 1.8V, no MR | Lower power but no manual reset; different timeout profile invalidates direct substitution | Select for ultra-low-power sensor nodes where MR is implemented externally |
Compared with MAX6326XR29D4+T and TLV803EB29DBZR, MAX6390XS29D4-T uniquely combines factory-trimmed 2.93V supervision, 1120ms VCC timeout, 140ms MR timeout, and integrated 1.56kΩ MR pullup in a 4-pin SC70 - making it optimal for space-constrained, manually resettable embedded systems requiring guaranteed brownout immunity.
Availability
MAX6390XS29D4-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hubs, and automotive body control modules requiring stable component supply and AEC-Q100–compatible timing assurance.
Supply support for MAX6390XS29D4-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 and mixed-signal ICs for industrial, automotive, and computing applications, with emphasis on power efficiency and reliability.
The MAX6381–MAX6390 family targets low-voltage microprocessor supervision in battery-powered and harsh-environment systems, delivering sub-μA quiescent current, wide temperature operation, and robust transient immunity.
FAQ
What is the exact reset threshold voltage of MAX6390XS29D4-T and how accurate is it over temperature?
The MAX6390XS29D4-T has a factory-set nominal reset threshold of 2.93V, 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 under "VCC Reset Threshold" and applies to all units regardless of production lot, ensuring consistent brownout detection in automotive and industrial deployments.
Does MAX6390XS29D4-T support dual-voltage monitoring like some other MAX638x parts?
No, MAX6390XS29D4-T does not support auxiliary voltage monitoring. Unlike MAX6387–MAX6389 variants, it lacks a RESET IN pin and is designed exclusively for single-rail VCC supervision. Its pinout (VCC, RESET, MR, GND) and functional description confirm it monitors only the VCC supply, with no provision for external resistor-divider configuration or secondary voltage comparison.
What is the internal pullup resistance on the MR pin of MAX6390XS29D4-T, and why is it different from earlier MAX638x parts?
The MR pin of MAX6390XS29D4-T features a 1.56kΩ internal pullup resistor, significantly lower than the 63kΩ used in MAX6384–MAX6386. This design choice reduces MR rise time and improves noise immunity in electrically noisy environments - a documented feature specific to MAX6390 per the "Detailed Description" section and Pin Description table.
Can MAX6390XS29D4-T operate reliably when VCC drops below 1.8V?
Yes, MAX6390XS29D4-T guarantees correct reset output behavior down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal circuitry remains functional and asserts reset properly even during deep brownout conditions, though the device ceases operation entirely below 1.0V.
Is MAX6390XS29D4-T pin-compatible with MAX809 or MAX6326?
No, MAX6390XS29D4-T is not pin-compatible with MAX809 or MAX6326. While the datasheet notes functional similarity and mentions pin compatibility *within the broader MAX6381–MAX6390 family*, MAX6390XS29D4-T uses a 4-pin SC70 package (pins: VCC, RESET, MR, GND), whereas MAX809 is a 3-pin SOT23 and MAX6326 is offered in 3-pin SC70 - differing in pin count, assignment, and physical outline.
MAX6390XS29D4-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:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX6390XS29D4-T FAQ
1.How can I place an order for MAX6390XS29D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS29D4-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 MAX6390XS29D4-T reliable?
The price and inventory of MAX6390XS29D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS29D4-T is usually 5 days.
3.What payment methods are accepted for MAX6390XS29D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS29D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS29D4-T?
MAX6390XS29D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS29D4-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 MAX6390XS29D4-T?
For technical support, including MAX6390XS29D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS29D4-T requirements.
6.How does Aetrix verify that MAX6390XS29D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6390XS29D4-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 MAX6390XS29D4-T meets industry standards.
7.What is the process for return or replacement of MAX6390XS29D4-T?
All MAX6390XS29D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS29D4-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 MAX6390XS29D4-T part is unused and in its original packaging.
Return procedure for MAX6390XS29D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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