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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:4,761
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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 industrial controllers requiring reliable brownout detection and pushbutton-initiated reset.
For engineers reviewing the MAX6390XS44D4-T datasheet, MAX6390XS44D4-T pinout, MAX6390XS44D4-T application, or MAX6390XS44D4-T equivalent, key selection criteria include its dual-timing reset architecture (VCC vs. MR timeout), 4-pin SC70 package footprint, ±2.5% reset threshold accuracy over –40°C to +125°C, and compatibility with systems requiring open-drain reset signaling with external pullup.
Technical Context
The MAX6390XS44D4-T implements a precision voltage comparator monitoring VCC against a factory-trimmed threshold, coupled with two independent timeout timers: one triggered by VCC falling below threshold (1120ms min), and another activated by manual reset assertion (140ms min). Its open-drain RESET output requires an external pullup resistor and remains valid down to VCC = 1V.
It features a dedicated active-low manual reset input (MR) with internal 500–1560Ω pullup (confirmed for MAX6390), enabling direct pushbutton interfacing without external components. Unlike variants with RESET IN, this part lacks auxiliary voltage monitoring - its supervision is strictly single-rail VCC-focused.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.27V (min) / 4.38V (nom) / 4.48V (max); sets brownout detection point for +4.3V nominal supply rails |
| VCC Reset Timeout | 1120ms (min); ensures μP remains held in reset long enough for power stabilization after recovery |
| MR Timeout | 140ms (min); provides short, deterministic reset pulse when pushbutton is released |
| Supply Current | 3μA at +1.8V; enables multi-year operation in coin-cell–powered IoT sensors |
| Reset Threshold Accuracy | ±2.5% over –40°C to +125°C; eliminates need for external calibration in automotive/industrial environments |
| Operating Voltage Range | +1.0V to +5.5V; supports valid reset assertion during deep brownout or partial power loss |
| Output Type | Open-drain active-low RESET; allows wired-OR configuration with other reset sources |
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. Pin 1 is RESET (open-drain active-low), Pin 2 is VCC, Pin 3 is MR (active-low manual reset), and Pin 4 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Drives low during reset; requires external pullup to system VDD; compatible with 1.8V–5V logic families |
| 2 - VCC | Power supply input and monitored rail | Supplies internal circuitry and serves as primary voltage monitor; absolute max rating +6.0V |
| 3 - MR | Active-low manual reset input | Pull low to force reset; internal ~1.56kΩ pullup to VCC ensures default high; TTL/CMOS compatible |
| 4 - GND | Ground reference | Return path for all internal currents; must be connected to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent timeout periods | VCC-triggered (1120ms) and MR-triggered (140ms) timers prevent spurious resets during transient recovery |
| Factory-trimmed reset threshold | 4.38V nominal with ±2.5% tolerance over full temperature range eliminates external resistor network |
| Ultra-low quiescent current | 3μA at +1.8V enables >10-year battery life in always-on portable instrumentation |
| Valid reset down to VCC = 1V | Ensures deterministic μP reset state even during severe undervoltage conditions |
| Integrated MR pullup | ~1.56kΩ internal resistor allows direct pushbutton-to-GND connection without external components |
Applications
| Industrial PLC Controller | Battery-Powered Data Logger |
|---|---|
Use Scenario: Monitors 4.3V system rail in programmable logic controller exposed to wide ambient temperature swings and EMI-rich factory floors. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout reset and operator-initiated reset via front-panel button. Use Value: 1120ms VCC timeout prevents premature μP release during AC line sag; ±2.5% threshold stability avoids false resets across –40°C to +85°C operating range. | Use Scenario: Powers remote environmental sensor node powered by CR2032 coin cell, logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Low-current supervisor ensuring clean boot after cold start and enabling field technician reset via tactile switch. Use Value: 3μA supply current extends battery life beyond 12 years; 140ms MR timeout gives crisp, non-latching reset response without software debounce overhead. |
| Automotive Body Control Module | Medical Point-of-Care Monitor |
Use Scenario: Embedded in 12V-to-5V/3.3V power tree of body control unit, supervising microcontroller supply under load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Single-rail VCC supervisor with AEC-Q100 qualified variant support (denoted by /V suffix). Use Value: Valid reset assertion down to VCC = 1V ensures safe shutdown during cranking (battery dips to ~6V, LDOs drop out); negative-going transient immunity suppresses glitches from relay switching. | Use Scenario: Used in handheld diagnostic device with dual-voltage architecture (core @ 1.8V, I/O @ 3.3V), requiring guaranteed reset during battery swap. IC Role / Device Role / Timing Role: Primary reset generator coordinating power sequencing between analog front-end and ARM Cortex-M core. Use Value: Open-drain RESET output enables shared reset bus with other peripherals; 4.38V threshold aligns precisely with 3.3V LDO dropout margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR43D4+T | Same 4-pin SC70 package, 4.19V reset threshold, 1120ms timeout, but push-pull active-low output (no external pullup required) | Lacks manual reset input; unsuitable where operator-initiated reset is mandatory | Select when board layout prohibits external pullup or system requires stronger drive capability |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.6μA typical ICC, SOT-23-5 package with enable input | Includes EN pin for power-gating control; no MR function; different pinout and footprint | Select when lower supply current or enable-controlled reset assertion is prioritized over manual reset |
Compared with MAX6326XR43D4+T and TPS3808G33DBVR, the MAX6390XS44D4-T uniquely delivers both precise 4.38V threshold supervision and integrated manual reset in a 4-pin SC70 - enabling compact, low-component-count designs where pushbutton reset and open-drain bus sharing are required.
Availability
MAX6390XS44D4-T is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, automotive body control modules, and medical point-of-care monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
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 delivers ultra-low-power, factory-trimmed microprocessor supervisors targeting space-constrained, battery-sensitive, and high-reliability embedded systems requiring guaranteed reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage of 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 –40°C to +125°C. This corresponds to the "44" suffix in the part number per Maxim's Reset Threshold table, making it suitable for systems with 4.3V nominal supplies.
Does MAX6390XS44D4-T support manual reset functionality?
Yes, the MAX6390XS44D4-T includes a dedicated active-low manual reset input (MR) on Pin 3. Driving MR low forces reset assertion; upon release, the internal timer holds RESET low for a guaranteed minimum of 140ms. An internal ~1.56kΩ pullup resistor to VCC eliminates the need for external biasing.
What is the reset timeout behavior of MAX6390XS44D4-T during power-up and manual reset?
The MAX6390XS44D4-T features two independent timeout periods: a 1120ms minimum reset timeout triggered when VCC rises above threshold (power-up/brownout recovery), and a 140ms minimum timeout triggered when the MR pin transitions from low to high (manual reset release). These are not interchangeable - each serves a distinct fault condition.
Is MAX6390XS44D4-T compatible with 1.8V logic systems?
Yes, the MAX6390XS44D4-T guarantees valid open-drain RESET output operation down to VCC = 1.0V and consumes only 3μA at +1.8V. Its RESET output can interface with 1.8V systems when paired with an appropriate external pullup resistor (e.g., to 1.8V rail), and MR accepts standard 1.8V logic-low levels.
What package type and pin count does MAX6390XS44D4-T use?
The MAX6390XS44D4-T uses a 4-pin SC70 package (outline 21-0098), with Pin 1 = RESET (open-drain active-low), Pin 2 = VCC, Pin 3 = MR (active-low manual reset), and Pin 4 = GND. It is RoHS-compliant (denoted by "+T" suffix) and measures 2.0mm × 2.1mm × 0.95mm.
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:
- Obsolete
- 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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