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Analog Devices Inc./Maxim Integrated MAX6389XS29D2
- Part No.:
- MAX6389XS29D2
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS29D2.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,642
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Product details
Overview
MAX6389XS29D2 from Maxim Integrated is a single-supply, open-drain active-low microprocessor supervisory circuit with auxiliary voltage monitoring capability. It features a factory-set 2.93V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum VCC reset timeout, and operates down to VCC = 1.0V while consuming only 3µA at 1.8V. It is used in portable battery-powered equipment to ensure reliable µP reset during brownout or power-up.
For engineers reviewing the MAX6389XS29D2 datasheet, MAX6389XS29D2 pinout, MAX6389XS29D2 application, or MAX6389XS29D2 equivalent, key selection considerations include its open-drain RESET output requiring external pull-up, dual-monitoring capability via RESET IN input, 2.93V threshold accuracy, 140ms timeout, and SC70-4 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6389XS29D2 integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.93V threshold and an independent auxiliary comparator referenced to +1.27V at the RESET IN pin. It asserts open-drain RESET low when either voltage falls below its respective threshold.
Its internal timer guarantees a minimum 140ms reset assertion after VCC recovers above 2.93V, and it maintains valid logic state for VCC ≥ 1.0V. The device supports resistor-divider configuration on RESET IN to set user-defined secondary thresholds, with input leakage ≤ ±50nA and propagation delay of 4.5µs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal, ±2.5% over -40°C to +125°C - ensures accurate brownout detection across industrial temperature range |
| VCC Reset Timeout | 140ms minimum - guarantees sufficient reset hold time for slow-ramping µP power supplies |
| Supply Current | 3µA at VCC = 1.8V - enables ultra-low-power operation in battery-critical applications |
| RESET Output Type | Open-drain active-low - requires external pull-up; supports wired-OR and level-shifting configurations |
| RESET IN Threshold | +1.27V internal reference - allows user-adjustable secondary reset via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - ensures functional reset assertion even during deep brownout conditions |
| Reset Propagation Delay | 4.5µs (RESET IN to RESET) - enables fast response to auxiliary supply faults |
Pinout & Package
MAX6389XS29D2 is housed in a 4-pin SC70 package (X4-1), measuring 1.5mm × 1.0mm × 0.8mm, suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor; powers internal circuitry and sets fixed reset threshold |
| 2 | RESET (open-drain) | Active-low reset output requiring external pull-up; sinks current during reset assertion |
| 3 | RESET IN | Auxiliary voltage monitor input referenced to +1.27V; triggers reset if voltage drops below threshold |
| 4 | GND | Ground reference for all internal comparators, timers, and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneous supervision of main VCC and secondary supply via RESET IN, enabling robust dual-rail systems |
| Factory-trimmed threshold | 2.93V ±2.5% over full temperature range eliminates need for external calibration components |
| Low-power operation | 3µA supply current at 1.8V extends battery life in portable instrumentation and wearables |
| Valid reset down to 1.0V | Guaranteed correct logic state at VCC ≥ 1.0V - critical for graceful shutdown in deep brownout scenarios |
| Negative-going transient immunity | Immune to short-duration VCC glitches (e.g., <10µs at 100mV overdrive), reducing false resets in noisy environments |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
Use Scenario: Wearable ECG sensor operating from single Li-ion cell with fluctuating voltage during discharge cycles. IC Role / Device Role / Timing Role: Supervises main rail and analog front-end supply; asserts RESET when VCC drops below 2.93V or RESET IN detects LDO dropout. Use Value: Prevents corrupted data acquisition and firmware lockup by enforcing clean µP restart before supply collapse. | Use Scenario: LoRaWAN end-node powered by coin-cell battery, requiring multi-year operation with periodic wake-up. IC Role / Device Role / Timing Role: Monitors both MCU core voltage and RF transceiver supply; provides 140ms reset pulse to synchronize wake-up sequence. Use Value: Ensures deterministic boot state after cold start or brownout, eliminating spurious radio transmissions. |
| Industrial Handheld Terminals | Dual-Rail Microcontroller Systems |
Use Scenario: Ruggedized barcode scanner using separate 3.3V logic and 5V motor driver rails. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 5V rail via resistor divider while VCC monitors 3.3V logic supply. Use Value: Triggers system-wide reset if either rail fails, preventing partial operation and hardware damage. | Use Scenario: FPGA-based controller with independent core (1.2V) and I/O (3.3V) supplies. IC Role / Device Role / Timing Role: Configured with RESET IN monitoring I/O rail and VCC monitoring core rail; open-drain output interfaces directly to FPGA reset pin. Use Value: Enables single-point reset coordination without level translators, simplifying BOM and layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387XS29D2 | Same 2.93V threshold, 140ms timeout, and SC70-4 package; differs only in part number suffix - functionally identical | No difference; both support RESET IN and open-drain output | Select MAX6387XS29D2 only if legacy design documentation references that variant |
| TLV803EB29DBZR | 2.93V threshold, 140ms timeout, SOT-23-3 package; no RESET IN pin; push-pull active-low output | Lacks auxiliary voltage monitoring; requires PCB redesign due to 3-pin vs. 4-pin footprint and different output drive | Choose only when secondary supply monitoring is unnecessary and board space permits SOT-23-3 placement |
Compared with MAX6389XS29D2, MAX6387XS29D2 is functionally identical and interchangeable, whereas TLV803EB29DBZR omits RESET IN and uses push-pull output - making it unsuitable for dual-supply monitoring or wired-OR bus topologies without layout changes.
Availability
MAX6389XS29D2 is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, and industrial handheld terminals requiring stable component supply and long-term manufacturability.
Supply support for MAX6389XS29D2 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, with emphasis on reliability and low-power operation.
The MAX6381–MAX6390 family was developed specifically for ultra-low-power microprocessor supervision in space- and energy-constrained systems, featuring factory-trimmed thresholds, dual-monitoring capability, and extended temperature operation.
FAQ
What is the reset threshold voltage of the MAX6389XS29D2?
The MAX6389XS29D2 has a factory-set nominal reset threshold of 2.93V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This value is fixed and not adjustable; it applies to the VCC supply pin. The RESET IN pin uses a separate +1.27V internal reference for auxiliary monitoring.
Does the MAX6389XS29D2 support monitoring a second voltage source?
Yes, the MAX6389XS29D2 supports dual-voltage monitoring via its dedicated RESET IN pin. This pin compares an external voltage-set using a resistor divider-to an internal +1.27V reference. Reset asserts if either VCC falls below 2.93V or the voltage at RESET IN drops below its derived threshold, enabling robust supervision of multi-rail systems.
What is the function of the RESET output on the MAX6389XS29D2?
The RESET output of the MAX6389XS29D2 is an open-drain, active-low signal. It must be pulled up externally to a valid logic-high voltage. When asserted (low), it holds the microprocessor in reset; it deasserts (high-impedance) after the 140ms timeout expires and both monitored voltages remain above their thresholds. This topology supports wired-OR configurations and level shifting.
What package type is used for the MAX6389XS29D2?
The MAX6389XS29D2 is packaged in a 4-pin SC70 (X4-1) outline, measuring 1.5mm × 1.0mm × 0.8mm. This compact, surface-mount package is optimized for high-density PCB layouts in portable and space-constrained applications. Pin 1 is VCC, Pin 2 is RESET, Pin 3 is RESET IN, and Pin 4 is GND.
How does the MAX6389XS29D2 behave during deep brownout conditions?
The MAX6389XS29D2 guarantees valid reset output behavior down to VCC = 1.0V, ensuring correct logic state even during severe brownout. Unlike many supervisors that fail below 1.8V, this device continues asserting RESET reliably until VCC rises above 2.93V and sustains the 140ms timeout - critical for preventing undefined µP states in low-voltage failure modes.
MAX6389XS29D2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6389XS29D2 FAQ
1.How can I place an order for MAX6389XS29D2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS29D2 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 MAX6389XS29D2 reliable?
The price and inventory of MAX6389XS29D2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS29D2 is usually 5 days.
3.What payment methods are accepted for MAX6389XS29D2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS29D2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS29D2?
MAX6389XS29D2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS29D2 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 MAX6389XS29D2?
For technical support, including MAX6389XS29D2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS29D2 requirements.
6.How does Aetrix verify that MAX6389XS29D2 is sourced from the original manufacturer or authorized distributors?
All MAX6389XS29D2 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 MAX6389XS29D2 meets industry standards.
7.What is the process for return or replacement of MAX6389XS29D2?
All MAX6389XS29D2 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS29D2, 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 MAX6389XS29D2 part is unused and in its original packaging.
Return procedure for MAX6389XS29D2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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