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Analog Devices Inc./Maxim Integrated MAX6389XS31D2+T
- Part No.:
- MAX6389XS31D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS31D2+T.pdf
- Description:
- IC MPU/RESET CIRC 3.08V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,955
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Product details
Overview
MAX6389XS31D2+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 3.08V reset threshold (±2.5% over -40°C to +125°C), 20ms 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 battery-powered embedded systems requiring reliable power-up/brownout detection.
For engineers reviewing the MAX6389XS31D2+T datasheet, MAX6389XS31D2+T pinout, MAX6389XS31D2+T application, or MAX6389XS31D2+T equivalent, key selection considerations include its 4-pin SC70 package, 3.08V VTH accuracy, 20ms VCC reset timeout, open-drain output requiring external pullup, and dual-monitoring capability via RESET IN comparator referenced to +1.27V.
Technical Context
The MAX6389XS31D2+T integrates a precision voltage comparator for VCC monitoring and a separate high-impedance RESET IN comparator referenced to an internal +1.27V bandgap. Reset asserts when either VCC falls below 3.08V or RESET IN drops below its threshold (set by external resistor divider), with guaranteed valid output down to VCC = 1V.
Its open-drain RESET output supports flexible logic-level interfacing across mixed-voltage systems, while the 20ms minimum timeout ensures sufficient hold time for μP initialization. The device features negative-going VCC transient immunity up to ~100µs for 100mV overdrive, and includes no internal MR pin - distinguishing it from MAX6384–MAX6386/MAX6390 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.5% over -40°C to +125°C - ensures stable brownout detection across automotive/industrial temperature range |
| Reset Timeout | 20ms minimum - guarantees adequate reset assertion duration for most 8-/16-bit microcontrollers during power-up |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable instruments |
| Operating Voltage | +1.0V to +5.5V - supports direct interface with core/logic rails from ultra-low-voltage ASICs to 5V legacy systems |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level-shifting without additional logic |
| RESET IN Threshold | +1.27V nominal (±2.5% over temp) - enables precise secondary voltage monitoring via external resistor divider |
| Input Leakage | ±1nA max on RESET IN - permits use of high-value resistors (e.g., 1MΩ) without threshold error |
Pinout & Package
MAX6389XS31D2+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.3mm × 1.7mm × 0.9mm. Pin 1 is RESET (open-drain active-low), Pin 2 is VCC, Pin 3 is GND, and Pin 4 is RESET IN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Requires external pullup resistor; sinks up to 3.2mA at VCC ≥ 4.5V; valid logic state guaranteed down to VCC = 1V |
| 2 - VCC | Main supply and primary reset monitor input | Monitored against 3.08V threshold; absolute max rating -0.3V to +6.0V; powers internal comparators and timer |
| 3 - GND | Analog/digital ground reference | Common return path for VCC, RESET, and RESET IN; must be low-impedance for noise immunity |
| 4 - RESET IN | Auxiliary voltage monitor input | High-impedance comparator input referenced to +1.27V; asserts reset if voltage falls below threshold set by external divider |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | VCC and RESET IN each drive reset independently - enables simultaneous supervision of core and I/O rails in dual-supply systems |
| Factory-trimmed reset threshold | 3.08V with ±2.5% accuracy over full industrial temperature range - eliminates need for external calibration or trimming components |
| Low quiescent current | 3μA at +1.8V - reduces battery drain in always-on monitoring applications such as smart meters and wearables |
| Negative transient immunity | Rejects VCC glitches ≤100µs wide for 100mV overdrive - prevents spurious resets in electrically noisy environments like motor control boards |
| Guaranteed operation down to VCC = 1V | RESET output remains valid and monotonic as supply decays - ensures clean shutdown sequencing in power-fail scenarios |
Applications
| Power-Fail Detection in Portable Medical Devices | Dual-Rail Monitoring in Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Battery-powered glucose meter detects falling main rail and backup rail during low-battery shutdown to preserve calibration data before power loss. IC Role / Device Role / Timing Role: MAX6389XS31D2+T monitors VCC (3.3V main rail) and RESET IN (1.8V backup rail) simultaneously; asserts open-drain RESET to halt MCU and trigger EEPROM save sequence. Use Value: 20ms timeout ensures full write cycle completion; 3μA current extends battery life beyond 5 years in standby mode. |
Use Scenario: Programmable logic controller supervises both 24V field-side and 3.3V logic-side supplies to prevent undefined states during partial power loss. IC Role / Device Role / Timing Role: MAX6389XS31D2+T uses RESET IN to monitor scaled-down 24V rail (via 19.1kΩ/1kΩ divider → 1.27V), while VCC monitors 3.3V logic rail. Use Value: Independent thresholds eliminate need for two discrete supervisors; open-drain output interfaces directly with 24V-tolerant FPGA reset inputs. |
| Low-Power Sensor Node Wake-Up Control | Brownout Protection in Automotive Body Controller |
|
Use Scenario: Wireless environmental sensor wakes periodically to sample and transmit; requires reliable reset if supply sags below operational voltage during RF transmission. IC Role / Device Role / Timing Role: MAX6389XS31D2+T's VCC monitor triggers reset at 3.08V, preventing corrupted ADC readings or failed BLE packet transmission. Use Value: 3μA supply current minimizes impact on sleep-mode budget; 20ms timeout aligns with typical MCU wake-up latency. |
Use Scenario: Door module monitors 12V battery rail and 5V regulator output to detect alternator failure or load-dump transients affecting microcontroller stability. IC Role / Device Role / Timing Role: MAX6389XS31D2+T configures RESET IN to monitor 5V rail (via 3.92kΩ/1kΩ divider), asserting reset if either rail collapses. Use Value: ±2.5% VTH accuracy over -40°C to +125°C ensures consistent trip point across vehicle operating conditions; AEC-Q100 qualified variant available. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT31D2+T | Same electrical specs but in 6-pin µDFN (1.5mm × 1.5mm) instead of 4-pin SC70; includes NC pins; higher thermal resistance (θJA = 477°C/W) | Better suited for thermally constrained PCB layouts where µDFN footprint is preferred; not pin-compatible with SC70 | Select MAX6389LT31D2+T when board space allows larger package and thermal dissipation is critical. |
| TPS3808G30DBVR | 3.0V reset threshold (±0.5% initial accuracy), 20ms timeout, push-pull active-low output, 1.8V–6.0V operation, 1.1μA typical ICC at 3.3V | Lacks RESET IN input; no dual-monitoring capability; requires no external pullup due to push-pull output | Choose TPS3808G30DBVR for single-rail systems where lowest possible current and simplified BOM outweigh need for auxiliary monitoring. |
Compared with MAX6389XS31D2+T, the LT31D2 variant offers identical functionality in a different package with trade-offs in size and thermal performance, while TPS3808G30DBVR provides tighter threshold accuracy and lower current but sacrifices dual-voltage supervision - making MAX6389XS31D2+T optimal for compact, dual-rail designs demanding proven automotive-grade reliability.
Availability
MAX6389XS31D2+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, low-power sensor nodes, and automotive body controllers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6389XS31D2+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 industrial, automotive, communications, and consumer applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy μP supervisory circuits optimized for battery-operated and thermally demanding systems where reliable power-up sequencing and brownout protection are mission-critical.
FAQ
What is the exact reset threshold voltage of MAX6389XS31D2+T and how accurate is it?
The MAX6389XS31D2+T has a factory-set reset threshold of 3.08V, with guaranteed accuracy of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Reset Thresholds table of the datasheet, where suffix "31" corresponds to nominal 3.08V. The threshold is trimmed during production and does not require external calibration.
Does MAX6389XS31D2+T have a manual reset (MR) input?
No, MAX6389XS31D2+T does not include a manual reset input. According to the Selector Guide and Pin Configurations, MR is present only on MAX6384/MAX6385/MAX6386/MAX6390 variants. MAX6389XS31D2+T is designated as a dual-monitoring device with RESET IN but no MR pin - its reset is triggered solely by VCC or RESET IN voltage violations.
What package type and dimensions does MAX6389XS31D2+T use?
MAX6389XS31D2+T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 1.3mm × 1.7mm × 0.9mm. It is RoHS-compliant (denoted by the "+" suffix) and rated for -40°C to +125°C operation. This compact footprint is ideal for space-constrained portable and automotive PCBs.
How does the RESET IN function work on MAX6389XS31D2+T?
On MAX6389XS31D2+T, the RESET IN pin connects to an internal comparator referenced to +1.27V. When the voltage at RESET IN falls below this threshold, reset asserts. Users set the effective trip point using an external resistor divider - for example, a 3.92kΩ/1kΩ divider on a 5V rail yields 1.27V at RESET IN, triggering reset when the 5V rail drops to ~4.95V. Input leakage is ≤±1nA, enabling high-impedance design.
What is the minimum reset timeout period for MAX6389XS31D2+T?
The MAX6389XS31D2+T has a minimum reset timeout period of 20ms, indicated by the "D2" suffix in its part number. This value is specified in the Reset Timeout Delay table and is guaranteed over temperature. The timeout begins when VCC or RESET IN rises above their respective thresholds and ensures sufficient reset assertion for μP initialization in most embedded applications.
MAX6389XS31D2+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:
- 3.08V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6389XS31D2+T FAQ
1.How can I place an order for MAX6389XS31D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS31D2+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 MAX6389XS31D2+T reliable?
The price and inventory of MAX6389XS31D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS31D2+T is usually 5 days.
3.What payment methods are accepted for MAX6389XS31D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS31D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS31D2+T?
MAX6389XS31D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS31D2+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 MAX6389XS31D2+T?
For technical support, including MAX6389XS31D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS31D2+T requirements.
6.How does Aetrix verify that MAX6389XS31D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS31D2+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 MAX6389XS31D2+T meets industry standards.
7.What is the process for return or replacement of MAX6389XS31D2+T?
All MAX6389XS31D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS31D2+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 MAX6389XS31D2+T part is unused and in its original packaging.
Return procedure for MAX6389XS31D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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