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Analog Devices Inc./Maxim Integrated MAX6390XS46D4
- Part No.:
- MAX6390XS46D4
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS46D4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,723
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Product details
Overview
MAX6390XS46D4 from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.63V reset threshold (±2.5% over -40°C to +125°C), 1120ms VCC reset timeout, and 140ms manual reset timeout. It monitors single-supply rails in battery-powered or space-constrained embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6390XS46D4 datasheet, MAX6390XS46D4 pinout, MAX6390XS46D4 application, or MAX6390XS46D4 equivalent, key selection factors include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over temperature, and dedicated manual reset input with internal 1.56kΩ pullup resistor.
Technical Context
The MAX6390XS46D4 implements a precision bandgap-based voltage comparator for VCC monitoring and a digital timeout counter triggered on threshold violation. Its open-drain RESET output requires an external pullup and asserts low when VCC drops below 4.63V or MR is pulled low, holding for 1120ms after VCC recovery or 140ms after MR release.
Unlike push-pull variants, this device uses open-drain logic to support wired-OR reset bus configurations and level translation across mixed-voltage systems. The MR input features a low-value internal pullup (1.56kΩ) optimized for fast release timing and noise immunity in industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (nominal), ±2.5% over -40°C to +125°C - ensures accurate brownout detection across automotive/industrial temperature ranges |
| VCC Reset Timeout | 1120ms minimum - guarantees µP initialization completes before firmware execution begins |
| Manual Reset Timeout | 140ms minimum - enables rapid system recovery without long reset hold times |
| Supply Current | 3µA at +1.8V - supports multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage Range | +1.0V to +5.5V - allows valid reset assertion even during deep brownout conditions |
| Output Type | Open-drain active-low - enables shared reset bus and voltage-level translation between disparate logic domains |
| MR Pullup Resistor | 1.56kΩ internal - ensures fast MR release time and robust noise rejection without external components |
Pinout & Package
MAX6390XS46D4 is housed in a 4-pin SC70 package (package code X4-1), measuring 1.5mm × 1.0mm × 0.8mm, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and sets fixed reset threshold |
| 2 | RESET | Open-drain active-low reset output; requires external pullup; sinks current during reset assertion |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 1.56kΩ resistor; initiates reset on logic-low transition |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for stable threshold accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 4.63V with ±2.5% tolerance over full temperature range eliminates need for external calibration |
| Dual timeout architecture | Independent 1120ms VCC timeout and 140ms MR timeout enables differentiated power-up vs. manual reset behavior |
| Low-VCC reset guarantee | Valid RESET state maintained down to VCC = 1.0V ensures deterministic behavior during severe brownout |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in noisy power environments |
| SC70-4 footprint compatibility | Pinout matches industry-standard 4-pin supervisory ICs, enabling drop-in replacement in existing designs |
Applications
| Battery-Powered Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG monitor powered by CR2032 coin cell with intermittent RF transmission. IC Role / Device Role / Timing Role: Supervises 3.3V LDO output; asserts reset if battery voltage sags below 4.63V during transmit burst. Use Value: Prevents corrupted sensor data logging by halting MCU until stable supply returns, leveraging 1120ms timeout to cover worst-case battery recovery. | Use Scenario: DIN-rail mounted analog input module operating in factory floor environment with 24VDC supply and local 5V regulation. IC Role / Device Role / Timing Role: Monitors 5V rail and provides manual reset via front-panel pushbutton linked to MR pin. Use Value: 140ms MR timeout enables quick field recovery without disrupting adjacent modules; open-drain output interfaces safely with 3.3V FPGA reset input. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Low-power BCM sub-module powered from vehicle battery through buck converter, subject to load-dump transients. IC Role / Device Role / Timing Role: Detects undervoltage on 5V domain; immune to <35µs negative spikes per typical characteristics. Use Value: ±2.5% threshold accuracy over -40°C to +125°C ensures consistent brownout response across under-hood thermal cycling. | Use Scenario: Tamper-resistant electricity meter with isolated microcontroller and backup supercapacitor. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and triggers controlled shutdown when capacitor voltage falls below 4.63V. Use Value: 3µA quiescent current extends supercapacitor hold-up time by >20% versus higher-ICC alternatives, delaying power-loss data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR46D4 | Same 4.63V threshold and 1120ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external pullup only if interfacing with open-drain buses | Select when board layout prohibits external pullup or when MR functionality is unnecessary |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.6µA ICC, SOT-23-5 package with MR and watchdog | Lower threshold and shorter timeout; includes watchdog timer not present in MAX6390XS46D4 | Select when system requires integrated watchdog or operates at 3.3V nominal with tighter power budget |
Compared with MAX6326XR46D4 and TPS3808G33DBVR, the MAX6390XS46D4 uniquely combines 4.63V precision threshold, dual independent timeouts, and open-drain output in a 4-pin SC70-enabling compact, noise-immune reset control where manual intervention and bus sharing are required.
Availability
MAX6390XS46D4 is available at Aetrix Electronics and suitable for battery-powered medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6390XS46D4 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 supervisory circuits for microprocessor reset in space- and power-constrained systems where reliability across extreme temperatures is critical.
FAQ
What is the exact reset threshold voltage of the MAX6390XS46D4?
The MAX6390XS46D4 has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "46" corresponds to min/typ/max values of 4.51V/4.63V/4.74V.
Does the MAX6390XS46D4 require an external pullup resistor on the RESET pin?
Yes, the MAX6390XS46D4 features an open-drain active-low RESET output, which requires an external pullup resistor to the target logic rail (e.g., 3.3V or 5V). The datasheet specifies that the output sinks current during reset assertion but cannot drive high without external biasing-this is inherent to its open-drain architecture.
What are the timeout periods for VCC reset and manual reset in the MAX6390XS46D4?
The MAX6390XS46D4 provides two distinct timeout periods: a minimum 1120ms reset timeout following VCC recovery (suffix D4), and a minimum 140ms timeout following manual reset release (MR pin). These values are fixed for this specific ordering variant and differ from other MAX6390 versions such as D7 (1200ms/150ms).
What is the internal pullup resistance on the MR pin of the MAX6390XS46D4?
The MR pin of the MAX6390XS46D4 includes an internal pullup resistor of 1.56kΩ to VCC, as specified in the Electrical Characteristics table under "MR Internal Pullup Resistance." This low-value resistor ensures fast MR release timing and improved noise immunity compared to standard 63kΩ pullups used in earlier MAX638x variants.
Can the MAX6390XS46D4 operate reliably at VCC = 1.0V?
Yes, the MAX6390XS46D4 guarantees correct RESET output logic state down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset behavior during deep brownout conditions where other supervisory ICs may fail to assert or deassert correctly.
MAX6390XS46D4 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:
- 4.63V
- 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
MAX6390XS46D4 FAQ
1.How can I place an order for MAX6390XS46D4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS46D4 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 MAX6390XS46D4 reliable?
The price and inventory of MAX6390XS46D4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS46D4 is usually 5 days.
3.What payment methods are accepted for MAX6390XS46D4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS46D4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS46D4?
MAX6390XS46D4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS46D4 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 MAX6390XS46D4?
For technical support, including MAX6390XS46D4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS46D4 requirements.
6.How does Aetrix verify that MAX6390XS46D4 is sourced from the original manufacturer or authorized distributors?
All MAX6390XS46D4 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 MAX6390XS46D4 meets industry standards.
7.What is the process for return or replacement of MAX6390XS46D4?
All MAX6390XS46D4 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS46D4, 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 MAX6390XS46D4 part is unused and in its original packaging.
Return procedure for MAX6390XS46D4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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