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Analog Devices Inc./Maxim Integrated MAX6389LT46D3+T
- Part No.:
- MAX6389LT46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6389LT46D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6389LT46D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 4.63V reset threshold (±2.5% over –40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, targeting power-critical embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6389LT46D3+T datasheet, MAX6389LT46D3+T pinout, MAX6389LT46D3+T application, or MAX6389LT46D3+T equivalent, key selection considerations include its open-drain reset architecture, dual-supply monitoring capability via RESET IN, guaranteed reset validity down to VCC = 1V, and AEC-Q100-qualified automotive variants.
Technical Context
The MAX6389LT46D3+T integrates a precision voltage comparator referenced to an internal 1.27V bandgap for the auxiliary RESET IN input, enabling user-configurable second-supply monitoring via external resistor divider. Its primary VCC reset comparator features ±2.5% threshold accuracy across –40°C to +125°C and immunity to negative-going transients up to 35µs at 100mV overdrive.
Reset assertion is triggered when either VCC falls below 4.63V or RESET IN drops below 1.27V; the open-drain output remains low for ≥140ms after recovery, requiring an external pullup. The device guarantees correct logic state for VCC ≥ 1V and supports manual reset initiation only in sibling parts (e.g., MAX6390), not this variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (±2.5% over –40°C to +125°C); ensures reliable detection of 5V rail brownout before system instability. |
| Reset Timeout | 140ms minimum; holds μP in reset long enough for power rails and clocks to stabilize post-recovery. |
| Supply Current | 3μA at 1.8V; enables multi-year battery life in portable equipment without compromising supervision integrity. |
| RESET Output Type | Open-drain active-low; allows wired-OR configuration with other reset sources and level-shifting flexibility. |
| Auxiliary Input | RESET IN comparator referenced to 1.27V (±2.5%); supports monitoring of secondary supply (e.g., I/O voltage) via external resistor divider. |
| Operating Voltage | 1.0V to 5.5V; guarantees valid reset assertion even during deep brownout conditions down to near-zero VCC. |
| Temp Range | –40°C to +125°C; qualified for under-hood automotive and industrial control environments. |
Pinout & Package
MAX6389LT46D3+T is housed in a 6-pin μDFN package (1.5mm × 1.0mm, 0.5mm pitch) with wettable flanks, optimized for space-constrained PCB layouts and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be connected to system ground plane. |
| 2 | VCC | Main supply input and primary voltage monitor; powers the IC and triggers reset when falling below 4.63V. |
| 3 | N.C. | No internal connection; left unconnected per design-no routing or termination required. |
| 4 | RESET | Open-drain active-low reset output; requires external pullup resistor to host supply (e.g., 10kΩ to 3.3V). |
| 5 | N.C. | No internal connection; electrically isolated-must remain floating or tied to GND if unused (not recommended). |
| 6 | RESET IN | High-impedance auxiliary voltage monitor input; compares external voltage to 1.27V reference for dual-rail supervision. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring | Simultaneous supervision of main VCC (4.63V threshold) and auxiliary rail (via RESET IN + 1.27V reference) prevents partial-system failure. |
| Low-power operation | 3μA supply current at 1.8V enables integration into always-on subsystems without measurable battery drain. |
| Transient immunity | Rejects negative VCC glitches ≤35µs at 100mV overdrive, eliminating false resets in noisy power environments. |
| Guaranteed reset validity | Output state remains logically valid down to VCC = 1V, ensuring deterministic μP behavior during deep undervoltage events. |
| Small-footprint packaging | 6-pin μDFN (1.5mm × 1.0mm) reduces board area by >50% vs. legacy SOT-23 solutions while supporting high-density routing. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Card |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply and 3.3V sensor interface rail in a vehicle door module subject to load-dump transients. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting open-drain reset to MCU when either rail dips below threshold during ignition cycling. Use Value: Prevents firmware corruption during battery voltage sag by holding reset for ≥140ms until both supplies stabilize post-cranking. | Use Scenario: Supervising FPGA core (1.2V) and I/O bank (3.3V) supplies on a programmable logic controller backplane. IC Role / Device Role / Timing Role: Using RESET IN to monitor 3.3V rail against 1.27V reference while VCC monitors 1.2V rail, triggering unified reset signal. Use Value: Eliminates need for two discrete supervisors, reducing BOM count and layout complexity while ensuring synchronized reset timing. |
| Battery-Powered Medical Sensor | Dual-Voltage IoT Gateway |
Use Scenario: Ensuring safe shutdown of a wearable ECG sensor powered by coin-cell battery with decaying voltage profile. IC Role / Device Role / Timing Role: Detecting 4.63V threshold breach on regulated 5V rail derived from boost converter, asserting reset before analog front-end misreads. Use Value: 3μA quiescent current extends operational life beyond 5 years on CR2032, while 140ms timeout accommodates slow battery recovery. | Use Scenario: Managing power sequencing between 1.8V RF SoC and 3.3V Ethernet PHY in a smart home hub with shared reset domain. IC Role / Device Role / Timing Role: Leveraging open-drain output to wire-OR with PHY's internal reset, creating single-point fault detection for both domains. Use Value: Enables fail-safe boot sequence where either supply fault halts initialization, preventing protocol handshake errors on dual-interface devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS46D3+T | Same electrical specs but in 4-pin SC70 package (1.6mm × 1.6mm); no N.C. pins; RESET IN pin occupies position 3 instead of 6. | Larger footprint and lower thermal performance (θJA = 322.6°C/W vs. 477°C/W for μDFN); less suitable for ultra-dense layouts. | Select for prototyping ease or compatibility with existing SC70 land patterns; avoid for thermally constrained designs. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold, push-pull active-low output, no auxiliary input; 1.6μA ICC at 3.3V; 200ms timeout. | Lacks dual-supply monitoring capability; requires external circuitry for second-rail supervision; incompatible with 4.63V threshold requirement. | Choose only if single-rail 3.3V supervision suffices and open-drain flexibility is unnecessary. |
Compared with MAX6389LT46D3+T, the SC70 variant trades miniaturization for assembly simplicity, while the TPS3808G33DBVR sacrifices dual-monitoring and precise 4.63V threshold for lower quiescent current and push-pull drive-neither offers drop-in replacement capability due to pinout, feature, or threshold mismatch.
Availability
MAX6389LT46D3+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLCs, battery-powered medical sensors, and dual-voltage IoT gateways requiring stable component supply and long-term lifecycle support.
Supply support for MAX6389LT46D3+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, emphasizing reliability, low power, and high integration.
The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for space-constrained, power-sensitive systems requiring guaranteed reset behavior across extreme temperatures and transient conditions.
FAQ
What is the exact reset threshold voltage of MAX6389LT46D3+T and how accurate is it over temperature?
The MAX6389LT46D3+T has a factory-set nominal reset threshold of 4.63V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This tolerance ensures robust brownout detection for 5V systems even under extreme thermal stress, and is validated per Maxim's production test specifications-not derived from typical curves or design estimates.
Does MAX6389LT46D3+T support manual reset functionality?
No, MAX6389LT46D3+T does not include a manual reset (MR) input. Manual reset capability is present only in MAX6384/MAX6385/MAX6386 and MAX6390 variants. The MAX6389LT46D3+T provides dedicated RESET IN for auxiliary voltage monitoring but lacks MR pin functionality-this is confirmed by the Pin Description table and Selector Guide in the official datasheet.
What package type and dimensions does MAX6389LT46D3+T use, and is it RoHS-compliant?
MAX6389LT46D3+T uses a 6-pin μDFN package measuring 1.5mm × 1.0mm with 0.5mm pitch and wettable flanks. The "+T" suffix explicitly denotes lead(Pb)-free and RoHS-compliant construction per Maxim's ordering information. Thermal resistance is θJA = 477°C/W on multilayer board, as specified in the Package Information section.
Can MAX6389LT46D3+T monitor two different supply voltages simultaneously?
Yes, MAX6389LT46D3+T supports dual-supply monitoring: its VCC pin monitors the primary supply (e.g., 5V rail) against the fixed 4.63V threshold, while the RESET IN pin monitors a secondary supply (e.g., 3.3V or 2.5V) by comparing it to an internal 1.27V reference-enabling user-defined thresholds via external resistor divider per the datasheet's Figure 1 configuration.
What is the minimum reset timeout period for MAX6389LT46D3+T and how is it guaranteed?
The MAX6389LT46D3+T provides a minimum reset timeout period of 140ms, as indicated by the "D3" suffix in its part number. This value is production-guaranteed (not typical) across –40°C to +125°C per the Electrical Characteristics table, ensuring the reset signal remains asserted long enough for power rails and clocks to fully stabilize after recovery from brownout conditions.
MAX6389LT46D3+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:
- 4.63V, 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:
- 6-µDFN (1.5x1)
MAX6389LT46D3+T FAQ
1.How can I place an order for MAX6389LT46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389LT46D3+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 MAX6389LT46D3+T reliable?
The price and inventory of MAX6389LT46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389LT46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6389LT46D3+T?
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4.How is shipping managed for MAX6389LT46D3+T?
MAX6389LT46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389LT46D3+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 MAX6389LT46D3+T?
For technical support, including MAX6389LT46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389LT46D3+T requirements.
6.How does Aetrix verify that MAX6389LT46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6389LT46D3+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 MAX6389LT46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6389LT46D3+T?
All MAX6389LT46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389LT46D3+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 MAX6389LT46D3+T part is unused and in its original packaging.
Return procedure for MAX6389LT46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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