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Analog Devices Inc./Maxim Integrated MAX6390XS31D4-T
- Part No.:
- MAX6390XS31D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS31D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,253
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Product details
Overview
MAX6390XS31D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 3.08V 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 = 1.0V.
For engineers reviewing the MAX6390XS31D4-T datasheet, MAX6390XS31D4-T pinout, MAX6390XS31D4-T application, or MAX6390XS31D4-T equivalent, key selection criteria include its 4-pin SC70 package, 3μA supply current at 1.8V, ±2.5% threshold accuracy, open-drain output requiring external pullup, and dedicated MR input with 1.56kΩ internal pullup resistor.
Technical Context
The MAX6390XS31D4-T implements a precision bandgap-based voltage comparator for VCC monitoring and a digital timeout counter triggered on threshold violation or MR assertion. Its reset logic guarantees monotonic state transitions with no metastability during brownout recovery.
Unlike push-pull variants, the open-drain RESET output supports wired-OR configurations and level translation across mixed-voltage domains. The MR input features integrated 1.56kΩ pullup and 100ns glitch rejection, enabling direct connection to momentary switches without external debounce components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.08V nominal, ±2.5% over -40°C to +125°C - ensures reliable power-up detection across automotive temperature range |
| VCC Reset Timeout | 1120ms minimum - provides sufficient hold time for slow-ramping microcontrollers and FPGAs |
| Manual Reset Timeout | 140ms minimum - enables fast user-initiated reset without interfering with system boot sequence |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Reset Output Type | Open-drain active-low - allows shared reset bus with multiple devices and voltage-level flexibility via external pullup |
| MR Pullup Resistance | 1.56kΩ internal - ensures robust low-state immunity while permitting direct switch-to-GND interface |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
Pinout & Package
MAX6390XS31D4-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 (typically 10kΩ) to host logic rail |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC at 1.56kΩ; assert by grounding via switch or logic |
| 4 | GND | Analog and digital ground reference; must connect to lowest-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.08V with ±2.5% tolerance over full industrial temperature range eliminates need for external calibration |
| Dual timeout architecture | Independent 1120ms VCC timeout and 140ms MR timeout prevents spurious resets during user-triggered reboots |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - suppresses noise-induced false resets in electrically noisy environments |
| Low-voltage operation guarantee | Valid reset assertion maintained down to VCC = 1.0V - ensures deterministic behavior during deep undervoltage events |
| RoHS-compliant SC70 package | 4-pin footprint compatible with standard reflow profiles and automated optical inspection (AOI) |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: Long-life environmental sensor node powered by CR2032 coin cell, requiring periodic wake-up and data transmission. IC Role / Device Role / Timing Role: Supervises VCC rail during cold-start and brownout; asserts reset until regulated 3.3V rail stabilizes and holds processor in reset for ≥1120ms. Use Value: 3μA quiescent current extends battery life beyond 5 years; open-drain output interfaces directly to 1.8V MCU reset pin via 10kΩ pullup. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 24V DC input and 3.3V logic domain. IC Role / Device Role / Timing Role: Monitors 3.3V logic supply and provides debounced manual reset via front-panel button connected to MR pin. Use Value: 140ms MR timeout enables immediate operator-initiated reset without disrupting watchdog timing; 1.56kΩ internal pullup eliminates external resistor. |
| Automotive Body Control Module | Medical Wearable Diagnostic Patch |
Use Scenario: Low-power BCM subassembly operating from 12V battery via LDO, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Detects VCC drop below 3.08V during cranking; asserts open-drain reset to main MCU and retains assertion for 1120ms after recovery. Use Value: ±2.5% threshold accuracy over -40°C to +125°C ensures consistent trip point across engine bay temperatures; AEC-Q100 qualified variant available. | Use Scenario: Disposable ECG patch with ultra-low-power ARM Cortex-M0+ MCU and Bluetooth LE radio. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery insertion and voltage ramp-up; MR pin used for factory test mode entry via shorting clip. Use Value: Valid reset down to VCC = 1.0V guarantees safe initialization even with partially discharged batteries; 2.0mm × 2.1mm SC70 footprint minimizes PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR31D4+T | Same 3.08V threshold and 1120ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external pullup only if interfacing to higher-voltage logic | Select when MR functionality is unnecessary and board layout favors push-pull drive |
| TPS3808G33DBVR | 3.3V threshold, 1200ms timeout, 2.5μA ICC at 3.3V, push-pull active-low, includes MR input with 50kΩ pullup | Higher threshold and tighter 1.5% initial accuracy; MR pullup value differs, affecting switch debounce behavior | Select when tighter threshold tolerance and lower ICC at 3.3V are prioritized over SC70 footprint compatibility |
Compared with MAX6326XR31D4+T, MAX6390XS31D4-T adds MR functionality and open-drain flexibility at the cost of higher MR pullup current; compared with TPS3808G33DBVR, it offers smaller SC70 footprint and guaranteed operation down to 1.0V VCC but with looser threshold tolerance.
Availability
MAX6390XS31D4-T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, automotive body control units, and medical wearable diagnostics requiring stable component supply and long-term lifecycle support.
Supply support for MAX6390XS31D4-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.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems where supply stability, small footprint, and extended temperature operation are critical.
FAQ
What is the exact reset threshold voltage of MAX6390XS31D4-T and how is it specified?
The MAX6390XS31D4-T has a factory-set VCC reset threshold of 3.08V nominal, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is derived from the "31" suffix in the part number per Maxim's Reset Threshold table, and applies specifically to the VCC monitor path-not the optional RESET IN input, which uses a separate 1.27V internal reference.
Does MAX6390XS31D4-T support manual reset, and what is the internal MR pullup value?
Yes, MAX6390XS31D4-T includes a dedicated active-low manual reset (MR) input with an internal pullup resistor of 1.56kΩ to VCC. This value is confirmed in the Electrical Characteristics table under "MR Internal Pullup Resistance" for MAX6390, enabling direct connection to a momentary switch without external components while providing robust noise immunity.
What are the reset timeout periods for MAX6390XS31D4-T, and how do they differ between VCC and MR events?
MAX6390XS31D4-T provides two independent timeout periods: a 1120ms minimum VCC reset timeout (triggered when VCC falls below 3.08V) and a 140ms minimum manual reset timeout (triggered when MR is asserted). These values correspond to the "D4" suffix and are explicitly documented in the Reset Timeout Period table for MAX6390, ensuring distinct timing behavior for power-related and user-initiated resets.
What package type and pin count does MAX6390XS31D4-T use, and is it RoHS-compliant?
MAX6390XS31D4-T is packaged in a 4-pin SC70 (surface-mount, lead-free) outline with dimensions 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms RoHS compliance per Maxim's ordering information, and the package code "X4+1" corresponds to outline number 21-0098 and land pattern 90-0187.
Can MAX6390XS31D4-T operate reliably at very low supply voltages, and what is the minimum functional VCC?
Yes, MAX6390XS31D4-T guarantees correct reset output state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset assertion during deep brownout conditions-critical for fail-safe operation in battery-depleted or faulted power systems-without requiring external biasing networks.
MAX6390XS31D4-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:
- 3.08V
- 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
MAX6390XS31D4-T FAQ
1.How can I place an order for MAX6390XS31D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS31D4-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 MAX6390XS31D4-T reliable?
The price and inventory of MAX6390XS31D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS31D4-T is usually 5 days.
3.What payment methods are accepted for MAX6390XS31D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS31D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS31D4-T?
MAX6390XS31D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS31D4-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 MAX6390XS31D4-T?
For technical support, including MAX6390XS31D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS31D4-T requirements.
6.How does Aetrix verify that MAX6390XS31D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6390XS31D4-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 MAX6390XS31D4-T meets industry standards.
7.What is the process for return or replacement of MAX6390XS31D4-T?
All MAX6390XS31D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS31D4-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 MAX6390XS31D4-T part is unused and in its original packaging.
Return procedure for MAX6390XS31D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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