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Analog Devices Inc./Maxim Integrated MAX6389XS44D3+T
- Part No.:
- MAX6389XS44D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS44D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,508
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Product details
Overview
MAX6389XS44D3+T from Maxim Integrated is an open-drain active-low microprocessor supervisory circuit designed for dual-voltage monitoring in space-constrained systems. It features a factory-set 4.38V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and auxiliary RESET IN input for secondary voltage supervision. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, making it suitable for battery-powered instrumentation and industrial controllers requiring reliable brownout detection.
For engineers reviewing the MAX6389XS44D3+T datasheet, MAX6389XS44D3+T pinout, MAX6389XS44D3+T application, or MAX6389XS44D3+T equivalent, key selection criteria include its open-drain reset output with guaranteed validity down to VCC = 1V, dual-supply monitoring capability via RESET IN, and AEC-Q100-qualified 4-pin SC70 package compatibility with tight layout constraints.
Technical Context
The MAX6389XS44D3+T implements two independent voltage comparators: one monitors VCC against a precision 4.38V threshold, while the second compares an external voltage applied to RESET IN against a stable 1.27V internal reference. Reset assertion occurs if either comparator trips, and the open-drain output remains low for ≥140ms after recovery.
Its auxiliary RESET IN input supports user-defined thresholds via resistor-divider networks (e.g., 100kΩ R1 + 100kΩ R2 yields ~2.54V trip point), enabling flexible dual-rail monitoring without external components beyond pullup resistors. The device guarantees correct reset state down to VCC = 1V and exhibits immunity to negative-going transients ≤35µs at 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V nominal (4.27V–4.48V range), ±2.5% accuracy over full temperature range ensures consistent brownout detection across harsh environments. |
| VCC Reset Timeout | 140ms minimum delay after VCC recovery - prevents premature μP release during slow power ramp-up or noisy supply conditions. |
| RESET Output Type | Open-drain active-low - requires external pullup but enables wired-OR reset bus sharing across multiple ICs. |
| Supply Current | 3μA at 1.8V - enables multi-year operation in coin-cell–powered devices without compromising supervision reliability. |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout, critical for fail-safe shutdown sequencing. |
| Auxiliary Input | RESET IN comparator referenced to 1.27V - allows precise monitoring of secondary rails (e.g., I/O or core voltage) using simple resistor dividers. |
| Temperature Range | -40°C to +125°C - qualified for automotive under-hood and industrial control applications requiring extended thermal stability. |
Pinout & Package
MAX6389XS44D3+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.25mm × 1.65mm × 0.95mm. This ultra-compact footprint minimizes PCB area in portable and high-density embedded designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail - powers internal circuitry and triggers reset when falling below 4.38V. |
| 2 | RESET (open-drain) | Active-low reset output requiring external pullup - asserts low during fault conditions and holds for ≥140ms post-recovery. |
| 3 | RESET IN | Auxiliary voltage monitor input - compared to 1.27V reference; reset asserts if external voltage drops below programmed threshold. |
| 4 | GND | Analog/digital ground reference - must be connected directly to system ground plane for accurate threshold sensing and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of main supply (VCC) and secondary rail (via RESET IN) eliminates need for discrete comparators in dual-rail systems. |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic μP reset state even during severe brownout - critical for safe firmware recovery in safety-critical applications. |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs wide at 100mV overdrive - prevents spurious resets in electrically noisy industrial environments. |
| Factory-trimmed precision threshold | 4.38V reset point with ±2.5% tolerance over -40°C to +125°C reduces calibration overhead in production test. |
| Low-power SC70 packaging | 4-pin SC70 footprint enables placement near μP reset pins with minimal trace inductance - improves noise rejection and signal integrity. |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring both 5V system rail and 3.3V microcontroller I/O supply in programmable logic controllers exposed to wide temperature swings and EMI. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting open-drain reset to halt CPU execution until both supplies stabilize within 4.38V and 2.54V thresholds. Use Value: Prevents corrupted register writes during partial power loss by enforcing synchronized reset release after ≥140ms timeout on both rails. | Use Scenario: Supervising 12V battery-derived 5V domain and isolated 3.3V domain powering CAN transceivers and sensor interfaces in body electronics. IC Role / Device Role / Timing Role: Primary VCC monitor (4.38V) plus RESET IN configured for 2.5V secondary rail - triggers unified reset on either domain failure. Use Value: Enables single-point fault detection for dual-domain power architecture, reducing BOM count versus discrete supervisors. |
| Portable Medical Instrumentation | Smart Energy Meters |
Use Scenario: Battery-powered handheld diagnostic devices requiring ultra-low quiescent current and guaranteed reset during Li-ion discharge from 4.2V to 2.8V. IC Role / Device Role / Timing Role: Low-power (3μA) supervisor ensuring μP remains held in reset until main supply exceeds 4.38V and auxiliary rail meets 1.27V reference. Use Value: Extends usable battery life while maintaining fail-safe boot behavior - no false releases during voltage sag caused by motor or display load transients. | Use Scenario: Revenue-grade electricity meters operating in outdoor enclosures where temperature extremes and grid surges threaten supply stability. IC Role / Device Role / Timing Role: Dual-monitoring supervisor detecting brownouts on both 3.3V logic rail and 5V analog front-end supply - asserts common reset line. Use Value: Meets IEC 62053-21 requirements for uninterrupted metering by guaranteeing ≥140ms reset hold time after supply recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT44D3+T | Same electrical specs but in 6-pin μDFN package - larger footprint, better thermal dissipation, different pinout (GND on pin 6, RESET IN on pin 3). | Suitable for higher-power or thermally demanding layouts where SC70 thermal resistance (322.6°C/W) may limit reliability. | Select when board layout allows 6-pin μDFN and thermal margin is prioritized over size. |
| TLV809K33DBZR | Single-supply 3.3V reset IC with push-pull output - lacks RESET IN input, fixed threshold, no dual-monitoring capability. | Applicable only for single-rail systems where auxiliary monitoring is unnecessary and open-drain bus sharing is not required. | Choose only for cost-sensitive, single-voltage applications without secondary rail supervision needs. |
Compared with MAX6389LT44D3+T, the MAX6389XS44D3+T saves 40% PCB area in SC70 but trades off thermal performance; versus TLV809K33DBZR, it adds critical dual-rail monitoring and open-drain flexibility at modest cost premium.
Availability
MAX6389XS44D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical instrumentation, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6389XS44D3+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, and computing applications, emphasizing low power, high reliability, and small form factors.
The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for battery-powered and thermally constrained systems where guaranteed reset behavior across voltage and temperature extremes is mandatory.
FAQ
What is the exact reset threshold voltage of MAX6389XS44D3+T and how stable is it over temperature?
The MAX6389XS44D3+T has a factory-set nominal reset threshold of 4.38V, with a guaranteed range of 4.27V to 4.48V at +25°C. Over the full operating temperature range (-40°C to +125°C), the threshold maintains ±2.5% accuracy relative to nominal, corresponding to 4.27V–4.48V at +25°C and scaling linearly with tempco of 60ppm/°C. This stability ensures consistent brownout detection without external calibration in automotive and industrial environments.
Does MAX6389XS44D3+T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6389XS44D3+T supports secondary voltage monitoring via its dedicated RESET IN pin, which connects to an internal comparator referenced to a precise 1.27V bandgap. To supervise an external rail (e.g., 3.3V or 2.5V), apply the voltage through a resistor divider network to RESET IN - the trip point is calculated as VTH = 1.27V × (R1/R2 + 1). The MAX6389XS44D3+T asserts reset if either VCC falls below 4.38V or the divided RESET IN voltage drops below 1.27V.
What is the function of the open-drain RESET output in MAX6389XS44D3+T and what external component is required?
The open-drain RESET output in MAX6389XS44D3+T provides an active-low signal that sinks current when asserted (low) and presents high impedance when deasserted (high). Because it cannot source current, an external pullup resistor to a compatible voltage rail (e.g., 3.3V or 5V) is mandatory. Typical values range from 10kΩ to 100kΩ - chosen to ensure sufficient rise time while minimizing standby current. This topology enables wired-OR connection of multiple reset sources on a shared reset bus.
How does MAX6389XS44D3+T handle power supply transients, and what is its immunity specification?
MAX6389XS44D3+T incorporates built-in immunity to short-duration negative-going VCC transients. According to its datasheet, it will not assert reset for transients ≤35µs wide when the overdrive (VTH – VCC) is 100mV. Immunity decreases as overdrive increases - e.g., a 200mV overdrive limits allowable pulse width to ~15µs. Adding a 0.1µF ceramic capacitor close to the VCC pin further enhances robustness against fast supply glitches in noisy industrial settings.
Is MAX6389XS44D3+T qualified for automotive applications, and what evidence supports this?
Yes, MAX6389XS44D3+T is AEC-Q100 qualified for automotive use. Its ordering information explicitly lists "/V" variants (e.g., MAX6389XS44D3/V+T) denoting automotive qualification, and the datasheet confirms AEC-Q100 compliance in the Features section. The device operates across -40°C to +125°C, meets stringent reliability testing per AEC-Q100 Rev G, and is offered in lead-free RoHS-compliant packages - fulfilling requirements for body electronics, infotainment, and ADAS subsystems.
MAX6389XS44D3+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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.38V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6389XS44D3+T FAQ
1.How can I place an order for MAX6389XS44D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS44D3+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 MAX6389XS44D3+T reliable?
The price and inventory of MAX6389XS44D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS44D3+T is usually 5 days.
3.What payment methods are accepted for MAX6389XS44D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS44D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS44D3+T?
MAX6389XS44D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS44D3+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 MAX6389XS44D3+T?
For technical support, including MAX6389XS44D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS44D3+T requirements.
6.How does Aetrix verify that MAX6389XS44D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS44D3+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 MAX6389XS44D3+T meets industry standards.
7.What is the process for return or replacement of MAX6389XS44D3+T?
All MAX6389XS44D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS44D3+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 MAX6389XS44D3+T part is unused and in its original packaging.
Return procedure for MAX6389XS44D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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