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Analog Devices Inc./Maxim Integrated MAX6390XS44D4+T
- Part No.:
- MAX6390XS44D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS44D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,106
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Product details
Overview
MAX6390XS44D4+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.27V (min) / 4.38V (nom) / 4.48V (max) VCC reset threshold, 1120ms minimum VCC reset timeout, and 140ms minimum manual reset timeout. It operates from +1.0V to +5.5V supply, consumes only 3μA at +1.8V, and guarantees valid reset state down to VCC = 1V - used in battery-powered controllers and critical μP power monitoring systems.
For engineers reviewing the MAX6390XS44D4+T datasheet, MAX6390XS44D4+T pinout, MAX6390XS44D4+T application, or MAX6390XS44D4+T equivalent, key selection considerations include its 4-pin SC70 package, dual timeout timing (VCC vs. MR), ±2.5% reset threshold accuracy over –40°C to +125°C, and compatibility with systems requiring glitch-immune brownout detection and manual reset with fast deassertion.
Technical Context
The MAX6390XS44D4+T implements a precision bandgap-based voltage comparator for VCC monitoring against a fixed 4.38V nominal threshold, paired with a temperature-stable internal timer that enforces a guaranteed-minimum 1120ms reset assertion after VCC recovery. Its manual reset input (MR) features a low-value 500–3000Ω internal pullup resistor, enabling fast 140ms timeout release and high noise immunity in noisy industrial environments.
Unlike earlier family members, MAX6390XS44D4+T uses an open-drain RESET output requiring an external pullup, supports negative-going VCC transient immunity up to 35µs at 100mV overdrive, and maintains reset validity across full –40°C to +125°C automotive-grade operating range without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.27V (min) / 4.38V (nom) / 4.48V (max); ensures reliable brownout detection for 4.5V nominal supplies |
| VCC Reset Timeout | 1120ms (min); holds μP in reset long enough for power rail stabilization after recovery |
| Manual Reset Timeout | 140ms (min); enables rapid system restart via pushbutton without extended hold time |
| Supply Current | 3μA at +1.8V; extends battery life in portable instrumentation and IoT edge nodes |
| Reset Threshold Accuracy | ±2.5% over –40°C to +125°C; eliminates need for external calibration in automotive/industrial designs |
| Operating Voltage Range | +1.0V to +5.5V; supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| MR Pullup Resistance | 500–3000Ω; provides strong internal bias for noise rejection on long PCB traces |
Pinout & Package
MAX6390XS44D4+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 and automotive control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and monitored voltage source; accepts +1.0V to +5.5V with guaranteed reset behavior down to 1V |
| 2 | GND | Analog/digital ground reference; must be low-impedance connection to avoid false resets |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; drives reset low when asserted |
| 4 | RESET | Open-drain active-low reset output; requires external pullup resistor to host supply rail |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent timeout periods | VCC reset timeout (1120ms) and MR timeout (140ms) prevent unnecessary delays during user-initiated restarts |
| High-accuracy reset threshold | ±2.5% over full temperature range eliminates recalibration and improves system reliability in thermal cycling environments |
| Low quiescent current | 3μA at +1.8V enables multi-year operation on coin-cell batteries in remote sensors and wearables |
| Robust MR interface | 500–3000Ω internal pullup ensures fast, noise-immune button response without external components |
| Negative VCC transient immunity | Withstands ≤35µs glitches at 100mV overdrive, reducing need for bulk capacitance on VCC rail |
Applications
| Industrial Controller Power Monitoring | Battery-Powered Medical Instrumentation |
|---|---|
Use Scenario: Monitors 4.5V main supply in PLC I/O modules during line transients and backup battery switchover. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low open-drain RESET to halt CPU execution until stable 4.5V rail is confirmed. Use Value: 1120ms VCC timeout prevents premature boot during capacitor recharge; ±2.5% threshold accuracy avoids spurious resets across –40°C to +85°C cabinet temperatures. | Use Scenario: Ensures safe startup and emergency reset in handheld glucose meters powered by CR2032 coin cells. IC Role / Device Role / Timing Role: Low-current (3μA) supervisor providing manual reset via tactile switch and brownout protection during battery depletion. Use Value: 140ms MR timeout enables responsive user restart; 1.0V operational floor allows reset assertion even as battery drops below 1.2V. |
| Automotive Body Control Module (BCM) | Dual-Voltage Embedded System |
Use Scenario: Validates 5.0V microcontroller supply in AEC-Q100 qualified BCMs exposed to load-dump and cold-crank conditions. IC Role / Device Role / Timing Role: Automotive-grade supervisor with guaranteed operation to +125°C and open-drain output compatible with 5V tolerant MCU reset inputs. Use Value: 4.38V nominal threshold matches typical 5V regulator tolerance; 1120ms timeout accommodates slow-rising post-cold-crank rails. | Use Scenario: Simultaneously monitors 3.3V I/O and 1.2V core rails in FPGA-based test equipment using external resistor divider on RESET IN (not applicable to MAX6390). IC Role / Device Role / Timing Role: Primary VCC supervisor for 4.5V auxiliary supply, while relying on separate dedicated IC for core rail monitoring. Use Value: Pin-compatible footprint allows reuse of 4-pin SC70 layout; open-drain output supports wired-OR reset bus architecture with other supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR44D4+T | Same 4-pin SC70 package, identical 4.27–4.48V threshold and 1120ms VCC timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; suited for fixed-reset-only systems without user intervention | Select when MR functionality is unnecessary and board-level pullup can be omitted |
| TLV809E43DBZR | 4.25V threshold (±1%), 140ms timeout, SOT-23-3 package, 0.5μA supply current, no MR input | Lower supply current but no manual reset; smaller footprint but single-function supervision | Choose for ultra-low-power, space-constrained applications where MR is not required |
Compared with MAX6326XR44D4+T and TLV809E43DBZR, MAX6390XS44D4+T uniquely delivers both precise 4.38V supervision and user-controllable 140ms manual reset in the same compact SC70 package - essential for field-serviceable embedded devices requiring deterministic restart behavior.
Availability
MAX6390XS44D4+T is available at Aetrix Electronics and suitable for industrial controller power monitoring, battery-powered medical instrumentation, and automotive body control modules requiring stable component supply, AEC-Q100-aligned qualification, and long-term lifecycle support.
Supply support for MAX6390XS44D4+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 was engineered specifically for low-voltage, low-power microprocessor supervision in space- and energy-constrained systems - emphasizing accuracy, wide temperature operation, and flexible reset timing.
FAQ
What is the exact reset threshold voltage range for MAX6390XS44D4+T?
The MAX6390XS44D4+T has a factory-set VCC reset threshold of 4.27V (minimum), 4.38V (nominal), and 4.48V (maximum) at +25°C, with ±2.5% accuracy maintained over the full –40°C to +125°C operating temperature range. This corresponds to the "44" suffix in the part number per Maxim's Reset Threshold table.
Does MAX6390XS44D4+T support manual reset, and what is its timeout behavior?
Yes, MAX6390XS44D4+T includes an active-low manual reset (MR) input with a guaranteed minimum timeout of 140ms after MR is released. Its internal pullup resistor (500–3000Ω) ensures robust noise immunity, and the 140ms MR timeout is distinct from its 1120ms VCC reset timeout - enabling fast user-initiated restarts without waiting for full power stabilization.
What package type and dimensions does MAX6390XS44D4+T use?
MAX6390XS44D4+T is supplied in a lead-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. It uses land pattern 90-0187 and is pin-compatible with other 4-pin SC70 supervisors in the MAX6381–MAX6390 family.
Can MAX6390XS44D4+T operate reliably at very low supply voltages?
Yes, MAX6390XS44D4+T guarantees correct reset output logic state down to VCC = 1.0V, and operates across a full +1.0V to +5.5V supply range. At +1.8V, it draws only 3μA, making it suitable for brownout detection in deeply discharged battery systems where other supervisors may fail.
Is MAX6390XS44D4+T qualified for automotive applications?
MAX6390XS44D4+T is rated for –40°C to +125°C operation and is AEC-Q100 qualified; however, only versions with the "/V" suffix (e.g., MAX6390XS44D4/V+T) are officially certified for automotive use. The "+T" suffix indicates tape-and-reel packaging but does not imply automotive qualification - confirm ordering code with /V for automotive programs.
MAX6390XS44D4+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
MAX6390XS44D4+T FAQ
1.How can I place an order for MAX6390XS44D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS44D4+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 MAX6390XS44D4+T reliable?
The price and inventory of MAX6390XS44D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS44D4+T is usually 5 days.
3.What payment methods are accepted for MAX6390XS44D4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS44D4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS44D4+T?
MAX6390XS44D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS44D4+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 MAX6390XS44D4+T?
For technical support, including MAX6390XS44D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS44D4+T requirements.
6.How does Aetrix verify that MAX6390XS44D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6390XS44D4+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 MAX6390XS44D4+T meets industry standards.
7.What is the process for return or replacement of MAX6390XS44D4+T?
All MAX6390XS44D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS44D4+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 MAX6390XS44D4+T part is unused and in its original packaging.
Return procedure for MAX6390XS44D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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