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Analog Devices Inc./Maxim Integrated MAX6390XS44D4
- Part No.:
- MAX6390XS44D4
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS44D4.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,391
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Product details
Overview
MAX6390XS44D4 from Maxim Integrated is an open-drain active-low microprocessor supervisory circuit with factory-set 4.27V reset threshold, 1120ms VCC reset timeout, and 140ms manual reset timeout. It monitors +1.8V to +5.0V supply rails, consumes only 3µA at +1.8V, and guarantees valid reset output down to VCC = 1V. Used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6390XS44D4 datasheet, MAX6390XS44D4 pinout, MAX6390XS44D4 application, or MAX6390XS44D4 equivalent, key selection criteria include its 4.27V ±2.5% threshold accuracy over –40°C to +125°C, SC70-4 package footprint, manual reset input with 1.56kΩ internal pullup, and immunity to negative-going VCC transients.
Technical Context
The MAX6390XS44D4 implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across temperature, paired with a digitally controlled timeout timer that enforces 1120ms minimum assertion after VCC recovery and 140ms after MR release. Its open-drain RESET output requires an external pullup and remains valid down to VCC = 1V.
Unlike push-pull variants, this device uses an open-drain topology for flexible logic-level interfacing and supports dual reset sources: monitored VCC and active-low manual reset (MR) with internal 1.56kΩ pullup - a value distinct from the 63kΩ used in earlier MAX6384–MAX6386 family members.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.27V (min), 4.38V (nom), 4.48V (max); factory-trimmed for precise power-rail monitoring at 4.3V-class supplies |
| VCC Reset Timeout | 1120ms (min); ensures µP remains held in reset long enough for stable clock and supply settling after brownout recovery |
| Manual Reset Timeout | 140ms (min); provides fast, debounced system reset via external switch without external RC timing components |
| Supply Current | 3µA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Operating Voltage Range | +1.0V to +5.5V; guarantees functional reset assertion even during deep brownout conditions down to 1V |
| Threshold Accuracy | ±2.5% over –40°C to +125°C; eliminates need for external calibration in automotive and industrial environments |
| MR Pullup Resistance | 1.56kΩ (typ); enables direct connection to open-drain logic or mechanical switches without external biasing |
Pinout & Package
MAX6390XS44D4 is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.5mm × 1.0mm × 0.8mm, with wettable flanks for automated optical inspection. Pin 1 = VCC, Pin 2 = RESET (open-drain active-low), Pin 3 = MR (active-low manual reset), Pin 4 = GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Primary supply input and monitored rail | Provides operating power and serves as the main voltage source for the reset comparator; must be decoupled with ≥0.1µF capacitor |
| RESET (Pin 2) | Open-drain active-low reset output | Drives low to assert reset; requires external pullup resistor (typically 10kΩ–100kΩ) to host supply rail; sinks up to 3.2mA at VCC ≥ 4.5V |
| MR (Pin 3) | Active-low manual reset input | Logic-low pulse forces reset; internal 1.56kΩ pullup to VCC eliminates need for external resistor; compatible with TTL/CMOS and momentary switches |
| GND (Pin 4) | Analog and digital ground reference | Common return path for all internal circuitry; must be connected directly to system ground plane with low-inductance trace |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.27V reset threshold | Eliminates external resistor divider for 4.3V supply monitoring, reducing BOM count and layout area |
| 1120ms VCC reset timeout | Ensures sufficient hold time for FPGA configuration, flash boot, or PLL lock in embedded controllers |
| 140ms manual reset timeout | Supports rapid, glitch-immune system restart via front-panel button without software intervention |
| 1.56kΩ internal MR pullup | Enables direct switch-to-ground connection with no external components, simplifying PCB routing |
| ±2.5% threshold accuracy over temperature | Guarantees deterministic reset behavior across automotive under-hood and industrial ambient ranges |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell, requiring guaranteed reset during battery voltage sag below 4.3V. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low reset to ARM Cortex-M0+ MCU until VCC recovers above 4.27V and holds for 1120ms. Use Value: Prevents corrupted memory writes and firmware crashes during intermittent battery contact or cold-temperature discharge. | Use Scenario: LoRaWAN sensor node with intermittent solar charging, where VCC fluctuates between 3.0V and 4.8V during charge cycles. IC Role / Device Role / Timing Role: Dual-source reset generator responding to both VCC brownout and user-initiated MR button press (140ms timeout). Use Value: Enables field-recoverable firmware updates via physical reset without requiring wireless reprogramming infrastructure. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted I/O module exposed to 12V supply ripple and load-dump transients in factory automation cabinets. IC Role / Device Role / Timing Role: Power supervisor rejecting sub-10µs negative VCC glitches while asserting reset on sustained dips below 4.27V for ≥1120ms. Use Value: Maintains deterministic startup sequencing despite noisy 24V DC bus, eliminating spurious watchdog timeouts. | Use Scenario: BCM controlling door locks and lighting, powered from vehicle battery subject to cranking dips below 6V. IC Role / Device Role / Timing Role: Open-drain RESET output interfaced to 5V-tolerant µP reset pin via 10kΩ pullup, asserting low during cranking-induced 4.3V collapse. Use Value: Ensures microcontroller resets cleanly during engine start and resumes operation only after stable 4.3V+ supply is restored. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326TASD3+T | Push-pull active-low output; 3.08V threshold; 140ms timeout; SC70-3 package | Lacks manual reset input and open-drain flexibility; smaller 3-pin footprint | Select when board space is critical and external pullup is undesirable, but MR functionality is not required |
| TPS3808G33DBVR | Push-pull active-low; 3.3V threshold; adjustable timeout (1ms–10s); SOT-23-5 package | Requires external capacitor for timeout setting; no integrated MR pullup; higher 8µA quiescent current | Choose when programmable timeout or tighter 0.5% threshold accuracy is needed, accepting larger footprint and higher current |
Compared with MAX6326TASD3+T and TPS3808G33DBVR, the MAX6390XS44D4 uniquely combines fixed 4.27V threshold, open-drain output, integrated 1.56kΩ MR pullup, and asymmetric VCC/MR timeout periods - enabling robust, component-minimal reset control in space-constrained 4.3V systems.
Availability
MAX6390XS44D4 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6390XS44D4 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 power, sensing, and interface applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family was engineered specifically for ultra-low-power microprocessor supervision in space- and energy-constrained systems, delivering factory-trimmed thresholds, guaranteed reset validity down to 1V, and transient-immune operation.
FAQ
What is the exact reset threshold voltage range for MAX6390XS44D4?
The MAX6390XS44D4 has a factory-set reset threshold of 4.27V (minimum), 4.38V (nominal), and 4.48V (maximum) over the full –40°C to +125°C temperature range, with ±2.5% accuracy. This corresponds to the "44" suffix in the part number and is laser-trimmed during production - no external adjustment is possible or required for 4.3V supply monitoring.
Does MAX6390XS44D4 support manual reset, and how is it implemented?
Yes, MAX6390XS44D4 includes an active-low manual reset (MR) input on Pin 3. It features an internal 1.56kΩ pullup resistor to VCC, allowing direct connection of a momentary switch to ground with no external components. A logic-low pulse on MR asserts reset for a guaranteed minimum 140ms after release, providing debounced, hardware-based system restart capability.
What package type and dimensions does MAX6390XS44D4 use?
MAX6390XS44D4 is supplied in a lead-free 4-pin SC70 package (package code X4-1), with outline dimensions of 1.5mm × 1.0mm × 0.8mm and wettable flanks. Pin 1 is VCC, Pin 2 is open-drain RESET, Pin 3 is MR, and Pin 4 is GND - matching the standard SC70-4 footprint used across Maxim's supervisory portfolio.
How does the open-drain RESET output of MAX6390XS44D4 differ from push-pull versions?
The MAX6390XS44D4 uses an open-drain RESET output (Pin 2) requiring an external pullup resistor to the host supply rail - unlike push-pull variants that drive both high and low. This allows level translation across different voltage domains (e.g., 4.3V supervisor driving a 3.3V µP reset pin) and supports wired-OR configurations in multi-supervisor systems.
What is the guaranteed operating voltage range for MAX6390XS44D4?
MAX6390XS44D4 operates from +1.0V to +5.5V supply voltage. Crucially, its reset output state remains guaranteed valid down to VCC = 1.0V - meaning the device continues to correctly assert or deassert the open-drain RESET signal even during severe brownout conditions, ensuring fail-safe µP behavior.
MAX6390XS44D4 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:
- 4.38V
- 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 FAQ
1.How can I place an order for MAX6390XS44D4 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS44D4 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 reliable?
The price and inventory of MAX6390XS44D4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS44D4 is usually 5 days.
3.What payment methods are accepted for MAX6390XS44D4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS44D4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS44D4?
MAX6390XS44D4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS44D4 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?
For technical support, including MAX6390XS44D4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS44D4 requirements.
6.How does Aetrix verify that MAX6390XS44D4 is sourced from the original manufacturer or authorized distributors?
All MAX6390XS44D4 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 meets industry standards.
7.What is the process for return or replacement of MAX6390XS44D4?
All MAX6390XS44D4 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS44D4, 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 part is unused and in its original packaging.
Return procedure for MAX6390XS44D4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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