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Analog Devices Inc./Maxim Integrated MAX6389XS29D3+T
- Part No.:
- MAX6389XS29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS29D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,078
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Product details
Overview
MAX6389XS29D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.93V VCC 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 battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6389XS29D3+T datasheet, MAX6389XS29D3+T pinout, MAX6389XS29D3+T application, or MAX6389XS29D3+T equivalent, key selection criteria include its 2.93V reset threshold accuracy, 140ms VCC reset timeout, open-drain output requiring external pullup, RESET IN comparator referenced to +1.27V, and guaranteed valid reset state down to VCC = 1V.
Technical Context
The MAX6389XS29D3+T integrates a precision voltage comparator monitoring VCC against a factory-trimmed 2.93V threshold and a separate high-impedance RESET IN input compared to an internal +1.27V reference. Reset assertion occurs when either voltage falls below its respective threshold, with independent timing control via a 140ms minimum timeout after recovery.
Its open-drain RESET output requires an external pullup resistor and guarantees VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.5V) and ≤ 0.3V at ISINK = 80µA (VCC ≥ 1.0V). The device maintains functional reset behavior across -40°C to +125°C and supports negative-going VCC transient immunity up to 35µs for 100mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V nominal, ±2.5% over -40°C to +125°C - ensures accurate brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for μP initialization after power stabilization |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level translation with external pullup |
| RESET IN Threshold | +1.27V reference, ±2.5% over temperature - supports user-defined secondary voltage monitoring via resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Reset Propagation Delay | 35µs max (VCC falling at 10mV/µs) - ensures fast response to supply collapse without false triggering |
Pinout & Package
MAX6389XS29D3+T is packaged in a RoHS-compliant 4-pin SC70 (package code X4+1, outline 21-0098) with 0.65mm pitch and thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail; powers internal circuitry and sets reset threshold reference point |
| 2 | RESET (open-drain) | Active-low reset signal output; requires external pullup resistor to define logic-high level and sink current during assertion |
| 3 | RESET IN | Auxiliary high-impedance input compared to +1.27V reference; enables monitoring of second voltage rail via external resistor divider |
| 4 | GND | Analog and digital ground reference; must be connected directly to system ground plane for stable comparator operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN enables robust power sequencing in dual-supply systems |
| Factory-trimmed threshold accuracy | ±2.5% over full -40°C to +125°C range eliminates need for external calibration in automotive/industrial applications |
| Negative transient immunity | Withstands VCC glitches up to 35µs duration at 100mV overdrive - reduces false resets in electrically noisy environments |
| Ultra-low quiescent current | 3μA at 1.8V enables integration into always-on battery-backed subsystems without compromising runtime |
| Valid reset down to 1V supply | Guarantees correct logic state on RESET pin even during deep brownout - prevents μP lockup before complete power loss |
Applications
| Battery-Powered IoT Sensor Node | Automotive Body Control Module |
|---|---|
|
Use Scenario: Long-life environmental sensor node powered by CR2032 coin cell, requiring reliable wake-up and reset during cold-start or voltage sag. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and backup 1.8V RTC rail via RESET IN; asserts open-drain reset to MCU until both rails stabilize for ≥140ms. Use Value: 3μA supply current extends battery life beyond 5 years; 2.93V threshold matches Li-ion discharge profile; RESET IN enables dual-rail coordination without extra components. |
Use Scenario: Central body controller managing door locks, lighting, and HVAC, operating across -40°C to +125°C under vehicle battery fluctuations. IC Role / Device Role / Timing Role: Monitors 5V domain and 3.3V I/O rail (via RESET IN); triggers reset on either rail drop below threshold with 140ms timeout aligned to ECU boot requirements. Use Value: ±2.5% threshold accuracy over temperature ensures consistent reset behavior across extreme ambient conditions; AEC-Q100 qualified variant available. |
| Industrial PLC I/O Module | Medical Portable Diagnostic Device |
|
Use Scenario: DIN-rail mounted I/O expansion module exposed to 24V supply ripple and ESD events in factory automation settings. IC Role / Device Role / Timing Role: Provides primary reset for ARM Cortex-M7 processor and secondary monitoring of isolated 5V analog front-end supply using RESET IN pin. Use Value: Open-drain output interfaces cleanly with opto-isolated reset lines; 35µs transient immunity suppresses false resets from motor drive noise. |
Use Scenario: Handheld ultrasound imager with dual-core SoC, requiring fail-safe reset during battery swap or low-battery shutdown sequences. IC Role / Device Role / Timing Role: Supervises 1.1V core and 3.3V peripheral supplies; RESET IN monitors battery voltage divider to initiate graceful shutdown before critical brownout. Use Value: Valid reset assertion down to VCC = 1V ensures deterministic SoC halt even during rapid battery depletion; 140ms timeout accommodates DDR memory initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT29D3+T | Same electrical specs but in 6-pin µDFN package (L611+1) instead of 4-pin SC70; includes NC pins not present in SC70 variant | Preferred for high-density PCB layouts where µDFN thermal performance (θJA = 477°C/W) or mechanical robustness is prioritized over footprint size | Select MAX6389LT29D3+T when board space allows larger package and higher power dissipation margin is needed. |
| MAX6387XS29D3+T | Identical 4-pin SC70 package and 2.93V/140ms specs, but adds manual reset input (MR) - not present in MAX6389XS29D3+T | Suitable for systems requiring operator-initiated reset (e.g., field-serviceable medical devices), whereas MAX6389XS29D3+T targets fully autonomous supervision | Choose MAX6387XS29D3+T only if manual reset functionality is required; otherwise MAX6389XS29D3+T offers simpler BOM and layout. |
Compared with MAX6389LT29D3+T, the MAX6389XS29D3+T saves board area with its smaller SC70 footprint but trades off thermal performance; versus MAX6387XS29D3+T, it removes MR complexity for cost-sensitive, reset-only applications where manual intervention is unnecessary.
Availability
MAX6389XS29D3+T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, automotive body controllers, industrial PLC I/O modules, and portable medical diagnostics requiring stable component supply and long-term lifecycle support.
Supply support for MAX6389XS29D3+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, communications, and consumer applications with emphasis on reliability and low-power operation.
The MAX6381–MAX6390 family delivers single/dual low-voltage microprocessor reset circuits optimized for ultra-low power consumption, wide temperature operation, and flexible supervision topologies in space-constrained systems.
FAQ
What is the exact reset threshold voltage of MAX6389XS29D3+T and how stable is it over temperature?
The MAX6389XS29D3+T has a factory-set VCC reset threshold of 2.93V nominal, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser trimming during production and is specified in the Electrical Characteristics table under "VCC Reset Threshold" with min/typ/max values of 2.85V/2.93V/3.00V at +25°C and wider bounds across temperature.
Does MAX6389XS29D3+T support monitoring a second voltage rail, and how is it implemented?
Yes, MAX6389XS29D3+T supports dual-voltage supervision via its dedicated RESET IN pin, which connects to an internal comparator referenced to +1.27V. To monitor a second rail, apply the target voltage to RESET IN through a resistor divider network - the threshold is set using R1 = R2 × [(VINTH / 1.27V) – 1], enabling precise user-defined trip points without additional ICs.
What are the key timing parameters for reset assertion and deassertion in MAX6389XS29D3+T?
MAX6389XS29D3+T asserts reset within 35µs after VCC falls below 2.93V (measured at 10mV/µs slew rate) and holds reset active for a minimum of 140ms after VCC rises above threshold. The RESET IN path adds 4.5µs propagation delay. These timings ensure reliable μP initialization while rejecting short transients - all guaranteed over -40°C to +125°C.
Can MAX6389XS29D3+T operate reliably at very low supply voltages, and what is the minimum functional VCC?
Yes, MAX6389XS29D3+T is guaranteed to maintain valid reset output logic states down to VCC = 1.0V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Its open-drain RESET output remains functional with VOL ≤ 0.3V at ISINK = 80µA even at this low voltage, ensuring deterministic μP reset behavior during deep brownout conditions.
What package type and footprint does MAX6389XS29D3+T use, and are land patterns available?
MAX6389XS29D3+T uses a 4-pin SC70 package (outline number 21-0098, package code X4+1) with 0.65mm pin pitch and RoHS-compliant lead-free finish. Official land pattern number 90-0187 is published by Maxim Integrated and available at maximintegrated.com/packages; the small 1.3mm × 1.1mm footprint supports high-density PCB layouts in portable and wearable applications.
MAX6389XS29D3+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:
- 2.93V, 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
MAX6389XS29D3+T FAQ
1.How can I place an order for MAX6389XS29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS29D3+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 MAX6389XS29D3+T reliable?
The price and inventory of MAX6389XS29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6389XS29D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS29D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS29D3+T?
MAX6389XS29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS29D3+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 MAX6389XS29D3+T?
For technical support, including MAX6389XS29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS29D3+T requirements.
6.How does Aetrix verify that MAX6389XS29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS29D3+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 MAX6389XS29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6389XS29D3+T?
All MAX6389XS29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS29D3+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 MAX6389XS29D3+T part is unused and in its original packaging.
Return procedure for MAX6389XS29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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