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Analog Devices Inc./Maxim Integrated MAX6390XS46D4-T
- Part No.:
- MAX6390XS46D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS46D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,658
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Product details
Overview
The MAX6390XS46D4-T 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 voltage in battery-powered or embedded systems where brownout immunity and guaranteed reset assertion down to VCC = 1V are critical.
For engineers reviewing the MAX6390XS46D4-T datasheet, MAX6390XS46D4-T pinout, MAX6390XS46D4-T application, or MAX6390XS46D4-T equivalent, key selection criteria include its dual-timing reset architecture (VCC vs. MR timeout), SC70-4 package footprint, ±2.5% threshold accuracy over automotive temperature range, and compatibility with legacy MAX809/MAX6326 families.
Technical Context
The MAX6390XS46D4-T implements a precision bandgap-based reset comparator with 60ppm/°C tempco and guarantees valid reset state down to VCC = 1V. Its internal timer enforces distinct timeout periods: 1120ms minimum after VCC recovery and 140ms minimum after manual reset release.
It features an internal 1.56kΩ pullup on the MR input-significantly lower than standard 63kΩ variants-enabling faster MR release timing and improved noise immunity in high-impedance environments. The open-drain RESET output requires an external pullup and supports sink currents up to 3.2mA at VCC ≥ 4.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal, ±2.5% over –40°C to +125°C - ensures reliable detection of 4.5V–4.75V supply rails in automotive and industrial applications |
| VCC Reset Timeout | 1120ms minimum - holds μP in reset long enough for power stabilization after brownout recovery |
| Manual Reset Timeout | 140ms minimum - provides fast, deterministic reset initiation without interfering with system boot timing |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable devices |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| MR Pullup Resistance | 1.56kΩ - reduces MR release time constant for robust debouncing without external components |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration with multiple supervisors or level translation via external pullup |
Pinout & Package
MAX6390XS46D4-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 PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and feeds reset comparator |
| 2 | RESET | Open-drain active-low reset output; requires external pullup resistor; sinks up to 3.2mA when asserted |
| 3 | MR | Active-low manual reset input with internal 1.56kΩ pullup to VCC; initiates reset when pulled ≤0.3×VCC |
| 4 | GND | Analog and digital ground reference; must be connected directly to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent timeout periods | 1120ms VCC recovery timeout + 140ms MR release timeout - decouples power-up stabilization from user-initiated reset timing |
| Factory-trimmed reset threshold | 4.63V with ±2.5% tolerance over full temperature range - eliminates need for external resistor dividers in fixed-rail monitoring |
| Low-voltage operation guarantee | Valid RESET output state maintained down to VCC = 1V - ensures deterministic behavior during deep undervoltage events |
| Negative-going transient immunity | Immune to VCC glitches <150µs wide at 100mV overdrive - suppresses false resets from switching noise or ESD coupling |
| Automotive-grade qualification | AEC-Q100 qualified (–40°C to +125°C) - certified for under-hood and infotainment applications requiring extended temperature reliability |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5V system rail in programmable logic controllers exposed to wide ambient temperature swings and conducted transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low reset to ARM Cortex-M7 MCU during brownout, with 1120ms hold time ensuring FPGA configuration stability. Use Value: Prevents corrupted firmware execution by guaranteeing reset remains asserted until 5V rail settles within ±2% for ≥1120ms post-recovery. | Use Scenario: Embedded in door module ECUs powered by vehicle battery (9V–16V) with local 5V LDO regulation. IC Role / Device Role / Timing Role: Resets microcontroller on ignition-on power ramp and during load-dump transients; MR pin tied to diagnostic test button. Use Value: 140ms MR timeout enables rapid field-service reset without disrupting CAN bus initialization sequence. |
| Portable Medical Sensor Hub | Smart Energy Meter |
Use Scenario: Powers ultra-low-power BLE sensor node operating from CR2032 coin cell with 3.0V nominal output. IC Role / Device Role / Timing Role: Detects voltage sag below 2.8V threshold (via external divider on RESET IN not used here); uses 4.63V variant only for 5V auxiliary rail monitoring. Use Value: 3μA quiescent current extends battery life beyond 5 years while maintaining fail-safe reset assertion during battery depletion. | Use Scenario: Monitors isolated 3.3V microcontroller supply in revenue-grade meter subjected to AC line surges and lightning-induced transients. IC Role / Device Role / Timing Role: Provides immunity to 100µs negative VCC spikes common in metering environments; open-drain output interfaces with optocoupled reset tree. Use Value: 1.56kΩ MR pullup prevents floating input failure and ensures clean reset edge despite long PCB traces to front-panel button. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR46D4+T | Same 4.63V threshold and 1120ms timeout, but push-pull active-low output and 63kΩ MR pullup | Lacks MR timing differentiation; requires external debounce for noisy switch inputs | Select when board layout already uses push-pull topology and MR signal path is short and shielded |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.6µA ICC at 3.3V, SOT-23-5 package | Not pin-compatible; no MR input; lower quiescent current but narrower voltage range | Select for cost-sensitive 3.3V-only designs where MR functionality is unnecessary and footprint flexibility exists |
Compared with MAX6326XR46D4+T, the MAX6390XS46D4-T offers faster MR release timing and better noise immunity due to its 1.56kΩ pullup; compared with TPS3808G33DBVR, it supports higher voltage rails and dual-timing control but consumes slightly more current at 1.8V.
Availability
MAX6390XS46D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor hubs, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6390XS46D4-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, communications, and computing markets.
The MAX6381–MAX6390 family delivers ultra-low-power, AEC-Q100–qualified supervisory circuits optimized for reliable reset generation in battery-powered and harsh-environment embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6390XS46D4-T?
The MAX6390XS46D4-T 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 VTH(nom) = 4.63V, VTH(min) = 4.51V, and VTH(max) = 4.74V.
Does the MAX6390XS46D4-T support manual reset functionality?
Yes, the MAX6390XS46D4-T includes a dedicated MR (manual reset) input pin with internal 1.56kΩ pullup to VCC. Driving MR low asserts reset; the device then maintains reset for a guaranteed minimum of 140ms after MR is released. This differs from earlier MAX638x variants that use 63kΩ pullups and longer MR timeouts.
What package type and dimensions does the MAX6390XS46D4-T use?
The MAX6390XS46D4-T is supplied in a 4-pin SC70 package (outline number 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. Its land pattern is documented as 90-0187, and it is RoHS-compliant, indicated by the "+T" suffix in the part number.
How does the MAX6390XS46D4-T handle power supply transients?
The MAX6390XS46D4-T provides immunity to short-duration negative-going VCC transients: it will not assert reset for glitches shorter than ~150µs when the overdrive (VTH – VCC) is 100mV, as shown in the Maximum Transient Duration vs. Reset Comparator Overdrive graph. A 0.1µF ceramic capacitor placed close to the VCC pin further enhances immunity.
Is the MAX6390XS46D4-T qualified for automotive applications?
Yes, the MAX6390XS46D4-T is AEC-Q100 qualified for automotive use and operates across the full –40°C to +125°C temperature range. While the base part number does not include the "/V" suffix, its ordering information confirms qualification for automotive applications, and it is listed in the automotive-capable section of the Selector Guide.
MAX6390XS46D4-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:
- 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-T FAQ
1.How can I place an order for MAX6390XS46D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS46D4-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 MAX6390XS46D4-T reliable?
The price and inventory of MAX6390XS46D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS46D4-T is usually 5 days.
3.What payment methods are accepted for MAX6390XS46D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS46D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS46D4-T?
MAX6390XS46D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS46D4-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 MAX6390XS46D4-T?
For technical support, including MAX6390XS46D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS46D4-T requirements.
6.How does Aetrix verify that MAX6390XS46D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6390XS46D4-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 MAX6390XS46D4-T meets industry standards.
7.What is the process for return or replacement of MAX6390XS46D4-T?
All MAX6390XS46D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS46D4-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 MAX6390XS46D4-T part is unused and in its original packaging.
Return procedure for MAX6390XS46D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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