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Analog Devices Inc./Maxim Integrated MAX6389LT26D6+T
- Part No.:
- MAX6389LT26D6+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6389LT26D6+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6389LT26D6+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.63V VCC reset threshold (±2.5% over −40°C to +125°C), 560ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in embedded power management systems.
For engineers reviewing the MAX6389LT26D6+T datasheet, MAX6389LT26D6+T pinout, MAX6389LT26D6+T application, or MAX6389LT26D6+T equivalent, key selection criteria include its guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy across automotive temperature range, 3μA supply current at 1.8V, and support for external resistor-divider–based secondary voltage supervision via RESET IN.
Technical Context
The MAX6389LT26D6+T implements a precision bandgap-based VCC reset comparator with 60ppm/°C tempco and an independent +1.27V reference for the RESET IN auxiliary input. It asserts reset when either VCC falls below 2.63V or RESET IN drops below its threshold (set by external divider).
Its internal timer guarantees a minimum 560ms reset assertion after VCC recovery or RESET IN recovery, with reset deassertion synchronized to the end of that timeout. The open-drain RESET output requires an external pullup and remains valid down to VCC = 1V, enabling robust brownout detection in low-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (nominal), ±2.5% over −40°C to +125°C - ensures accurate brownout detection across automotive temperature range |
| Reset Timeout Period | 560ms (min) - provides sufficient hold time for μP initialization after power recovery |
| Supply Current | 3μA at +1.8V - enables ultra-low-power operation in battery-backed or energy-constrained systems |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and flexible voltage-level translation with external pullup |
| Auxiliary Input | RESET IN with +1.27V internal reference - supports user-defined second-voltage monitoring via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Reset Comparator Tempco | 60ppm/°C - minimizes threshold drift over temperature, critical for stable long-term reliability |
Pinout & Package
MAX6389LT26D6+T is housed in a RoHS-compliant 6-pin μDFN package (1.5mm × 1.5mm, 0.5mm pitch), optimized for space-constrained PCB layouts in automotive and industrial control modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be low-impedance connection |
| 2 | VCC | Main supply input and primary voltage monitor; powers device and triggers reset when below 2.63V |
| 3 | N.C. | No internal connection; left unconnected per design - no routing or termination required |
| 4 | RESET IN | Auxiliary high-impedance input referenced to +1.27V; used with external resistor divider to monitor second supply rail |
| 5 | N.C. | No internal connection; left unconnected per design - no routing or termination required |
| 6 | RESET | Open-drain active-low reset output; sinks current when asserted; requires external pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC (2.63V threshold) and user-configurable second rail via RESET IN with ±1.5% reference accuracy |
| Ultra-low quiescent current | 3μA at 1.8V enables >10-year battery life in always-on supervisory applications |
| Automotive-grade thermal stability | ±2.5% reset threshold accuracy maintained from −40°C to +125°C without calibration |
| Brownout immunity | Guaranteed valid RESET output state down to VCC = 1V - prevents spurious release during deep undervoltage |
| Transient rejection | Immune to negative-going VCC glitches ≤35µs at 100mV overdrive - suppresses noise-induced false resets |
Applications
| Industrial PLC Power Sequencing | Automotive ADAS Camera Module |
|---|---|
Use Scenario: Monitoring main 3.3V logic rail and 1.2V core rail in programmable logic controller backplane. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting system-wide reset if either rail drops below safe operating level. Use Value: Prevents firmware corruption during partial power loss by holding μP in reset until both rails stabilize for ≥560ms. | Use Scenario: Ensuring clean boot of image sensor and ISP in rear-view camera under cold-crank battery conditions. IC Role / Device Role / Timing Role: Primary VCC (2.63V) supervisor with auxiliary RESET IN monitoring 1.8V I/O supply. Use Value: Guarantees reset assertion during battery dip to 2.4V while maintaining valid output down to VCC = 1V. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU Supervision |
Use Scenario: Critical safety monitoring of 5V analog front-end and 1.8V digital core in battery-operated infusion pump. IC Role / Device Role / Timing Role: Open-drain RESET output tied to shared reset bus with other safety-critical ICs. Use Value: Enables wired-OR reset arbitration and eliminates single-point failure via external pullup redundancy. | Use Scenario: Long-life metering application requiring decade-level reliability with lithium-thionyl chloride backup battery. IC Role / Device Role / Timing Role: Low-current (3μA) supervisor ensuring μP reset during mains dropout or capacitor discharge. Use Value: Extends backup runtime by minimizing quiescent drain while guaranteeing deterministic reset behavior at 1.0V VCC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS26D6+T | Same reset threshold (2.63V) and timeout (560ms), but in 4-pin SC70 package - smaller footprint, no N.C. pins | Limited to single-rail monitoring only; lacks RESET IN pin - unsuitable for dual-voltage systems | Select when board space is constrained and only VCC supervision is required |
| TLV809E26DBVR | 2.63V threshold, 560ms timeout, open-drain output, but no auxiliary RESET IN input and ±3% threshold accuracy over −40°C to +125°C | Designed for cost-sensitive consumer applications; not AEC-Q100 qualified | Select for non-automotive industrial use where RESET IN functionality is unnecessary |
Compared with MAX6389LT26D6+T, the SC70 variant sacrifices dual-supply capability for compactness, while the TLV809E26DBVR trades automotive qualification and auxiliary monitoring for lower unit cost and broader commercial availability.
Availability
MAX6389LT26D6+T is available at Aetrix Electronics and suitable for automotive ADAS modules, industrial PLCs, medical infusion pumps, and smart energy meters requiring stable component supply with AEC-Q100 compliance and long-term lifecycle support.
Supply support for MAX6389LT26D6+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 demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessors in harsh environments - specifically engineered for reliable operation across −40°C to +125°C with minimal supply current.
FAQ
What is the exact reset threshold voltage of MAX6389LT26D6+T and how stable is it over temperature?
The MAX6389LT26D6+T has a factory-set nominal VCC reset threshold of 2.63V, with guaranteed accuracy of ±2.5% over the full −40°C to +125°C operating range. Its 60ppm/°C tempco ensures minimal drift, making it suitable for automotive and industrial applications where thermal stability is critical. This specification is confirmed in the Electrical Characteristics table of the official datasheet.
Does MAX6389LT26D6+T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6389LT26D6+T includes a dedicated RESET IN pin referenced to an internal +1.27V precision bandgap. By connecting an external resistor divider between the second supply rail and ground, users can set a custom reset threshold using the formula VINTH = 1.27V × (R1/R2 + 1). The MAX6389LT26D6+T asserts reset if either VCC falls below 2.63V or the voltage at RESET IN drops below its calculated threshold.
What is the function of the two N.C. pins on the 6-pin μDFN package of MAX6389LT26D6+T?
Pins 3 and 5 of the MAX6389LT26D6+T's 6-pin μDFN package are designated No Connection (N.C.) - they are not bonded internally and serve no electrical function. These pins must remain unconnected on the PCB; no routing, termination, or grounding is required. Their presence accommodates pin compatibility across the MAX6381–MAX6390 family while maintaining consistent package dimensions.
Can MAX6389LT26D6+T operate reliably during deep brownout conditions, and what is its minimum functional VCC?
Yes, MAX6389LT26D6+T guarantees correct reset output logic state down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic reset assertion and hold time even during severe undervoltage events - a key requirement for fail-safe operation in automotive and medical systems where power collapse may occur gradually.
Is MAX6389LT26D6+T qualified for automotive applications, and what certification does it hold?
Yes, MAX6389LT26D6+T is AEC-Q100 qualified for automotive applications. The "/V" suffix denotes automotive qualification, and while this specific part number omits "/V", its underlying MAX6389 base device and packaging (μDFN) are explicitly listed in the datasheet's Ordering Information as AEC-Q100 compliant when ordered with the /V suffix. The +T suffix confirms RoHS-compliant, lead-free packaging suitable for automotive manufacturing.
MAX6389LT26D6+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 560ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-µDFN (1.5x1)
MAX6389LT26D6+T FAQ
1.How can I place an order for MAX6389LT26D6+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389LT26D6+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 MAX6389LT26D6+T reliable?
The price and inventory of MAX6389LT26D6+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389LT26D6+T is usually 5 days.
3.What payment methods are accepted for MAX6389LT26D6+T?
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4.How is shipping managed for MAX6389LT26D6+T?
MAX6389LT26D6+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389LT26D6+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 MAX6389LT26D6+T?
For technical support, including MAX6389LT26D6+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389LT26D6+T requirements.
6.How does Aetrix verify that MAX6389LT26D6+T is sourced from the original manufacturer or authorized distributors?
All MAX6389LT26D6+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 MAX6389LT26D6+T meets industry standards.
7.What is the process for return or replacement of MAX6389LT26D6+T?
All MAX6389LT26D6+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389LT26D6+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 MAX6389LT26D6+T part is unused and in its original packaging.
Return procedure for MAX6389LT26D6+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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