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Analog Devices Inc./Maxim Integrated MAX6389XS29D1-T
- Part No.:
- MAX6389XS29D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS29D1-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,799
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Product details
Overview
MAX6389XS29D1-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), 1ms 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, serving as a critical power-on reset and brownout detector in space-constrained embedded systems.
For engineers reviewing the MAX6389XS29D1-T datasheet, MAX6389XS29D1-T pinout, MAX6389XS29D1-T application, or MAX6389XS29D1-T equivalent, key selection criteria include its 4-pin SC70 package, 2.93V threshold accuracy, 1ms reset delay, open-drain output requiring external pullup, and dual-monitoring capability via RESET IN - all validated for automotive-grade operation (AEC-Q100 qualified).
Technical Context
The MAX6389XS29D1-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.93V threshold while simultaneously accepting an external voltage at RESET IN for secondary supply supervision. Its internal timer guarantees reset assertion for ≥1ms after VCC recovers above threshold or after RESET IN rises above 1.27V.
Reset assertion logic is independent of VCC level down to 1.0V; the open-drain output remains functional with valid VOL ≤ 0.3V at ISINK = 80µA, enabling direct interface with 1.8V–5.5V µP reset inputs. The device features negative-going VCC transient immunity up to 100mV overdrive for durations under 10µs, verified per typical operating characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive temperature range |
| Reset Timeout Period | 1ms minimum - provides sufficient hold time for microprocessor initialization before release |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year battery life in portable equipment |
| RESET Output Type | Open-drain active-low - requires external pullup but supports mixed-voltage system interfacing |
| Auxiliary Input | RESET IN with 1.27V internal reference - allows user-defined second-supply threshold via resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - guarantees reset validity during deep brownout and compatibility with core/I/O rails |
| Package | 4-pin SC70 (X4+1 outline) - 1.2mm × 1.6mm footprint ideal for compact PCB layouts |
Pinout & Package
MAX6389XS29D1-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.2mm × 1.6mm × 0.9mm with gull-wing leads. Thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor - powers internal circuitry and triggers reset when falling below 2.93V |
| 2 | RESET | Open-drain active-low reset output - sinks current when asserted; requires external pullup to host rail |
| 3 | GND | Analog/digital ground reference - must be connected directly to system ground plane for noise immunity |
| 4 | RESET IN | Auxiliary voltage monitor input - compared to 1.27V internal reference; asserts reset if voltage drops below threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring | Simultaneous VCC and RESET IN supervision enables robust power sequencing in dual-rail systems (e.g., core + I/O) |
| Factory-trimmed threshold | 2.93V reset point set at wafer level with ±2.5% tolerance - eliminates external resistor calibration |
| Ultra-low quiescent current | 3μA at 1.8V - reduces standby power in always-on battery-powered nodes |
| Valid reset down to VCC = 1V | Guaranteed output state integrity even during severe brownout - prevents spurious release |
| Negative transient immunity | Rejects VCC glitches <10µs wide at 100mV overdrive - avoids false resets in noisy environments |
Applications
| Industrial PLC Controller | Automotive ADAS Camera Module |
|---|---|
Use Scenario: Monitors both 3.3V I/O rail and 1.2V core rail in programmable logic controller CPU board during cold cranking and load dump events. IC Role / Device Role / Timing Role: Dual-voltage supervisor providing synchronized reset to ARM Cortex-M7 MCU and FPGA fabric upon any rail failure. Use Value: Prevents firmware corruption by holding reset until both supplies stabilize post-brownout, leveraging 2.93V VCC threshold and 1.27V RESET IN reference. | Use Scenario: Ensures clean boot of image signal processor in rear-view camera exposed to automotive temperature extremes and EMI. IC Role / Device Role / Timing Role: AEC-Q100 qualified supervisor asserting reset during engine start-up voltage sag (<6V battery dip) and validating dual-rail integrity. Use Value: 1ms timeout and ±2.5% threshold accuracy guarantee deterministic reset timing across –40°C to +125°C, meeting ISO 26262 ASIL-B readiness requirements. |
| Medical Wearable Sensor Hub | Smart Energy Meter MCU |
Use Scenario: Powers on ultra-low-power sensor fusion SoC from coin-cell battery while monitoring regulated 1.8V supply and unregulated battery voltage. IC Role / Device Role / Timing Role: Low-current supervisor enabling >5-year battery life; RESET IN used to detect end-of-life battery voltage drop. Use Value: 3μA supply current at 1.8V and open-drain output minimize loading on battery rail while supporting flexible reset signaling. | Use Scenario: Supervises 3.3V communication interface and 2.5V metrology ADC supply in DIN-rail mounted electricity meter subject to grid surges. IC Role / Device Role / Timing Role: Dual-monitoring supervisor triggering system-wide reset if either supply deviates beyond tolerance during lightning-induced transients. Use Value: Negative-going transient immunity (≤10µs rejection) prevents nuisance resets during fast grid disturbances without external filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT29D1-T | Same electrical specs but in 6-pin μDFN (L611+1) instead of 4-pin SC70 - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Suitable for thermally demanding industrial designs where SC70 self-heating may impact long-term reliability | Select when PCB layout allows 2.0mm × 2.0mm area and thermal margin is prioritized over size |
| TLV803EB29DBZR | 2.93V threshold, 1ms timeout, open-drain output, but no RESET IN pin - single-supply only; 3μA ICC at 1.8V; SOT-23-3 package | Lacks dual-monitoring capability - appropriate only for single-rail systems without auxiliary voltage supervision needs | Choose for cost-sensitive, space-constrained applications where only VCC monitoring is required |
Compared with MAX6389XS29D1-T, the μDFN variant offers higher thermal dissipation but occupies more board area, while the TLV803EB29DBZR reduces cost and size but sacrifices RESET IN functionality - selection depends on whether dual-supply monitoring and SC70 miniaturization are mandatory design requirements.
Availability
MAX6389XS29D1-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive ADAS modules, medical wearables, and smart energy meters requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for MAX6389XS29D1-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, and computing applications, emphasizing low power, high reliability, and small form factors.
The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervisory circuits optimized for battery-operated and automotive systems where accurate voltage monitoring, minimal quiescent current, and dual-supply capability are essential.
FAQ
What is the exact reset threshold voltage of MAX6389XS29D1-T and how stable is it over temperature?
The MAX6389XS29D1-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 using laser-trimmed on-chip resistors and a precision bandgap reference, ensuring consistent brownout detection without external calibration. The MAX6389XS29D1-T maintains this specification across automotive and industrial environments.
Does MAX6389XS29D1-T support monitoring of a second voltage, and how is it implemented?
Yes, MAX6389XS29D1-T includes a dedicated RESET IN pin that monitors a second voltage using an internal 1.27V reference. A resistor divider network connected to RESET IN sets the auxiliary threshold according to VINTH = 1.27V × (R1/R2 + 1). The device asserts reset if either VCC falls below 2.93V or RESET IN drops below 1.27V - enabling dual-rail supervision in systems like processors with separate core and I/O supplies. This function is confirmed in the MAX6389XS29D1-T pin description and typical operating circuit.
What is the reset timeout period of MAX6389XS29D1-T, and is it adjustable?
The MAX6389XS29D1-T has a fixed minimum reset timeout period of 1ms, as indicated by the "D1" suffix in its part number. This value is factory-programmed and not user-adjustable. The timeout begins when VCC rises above 2.93V (or RESET IN rises above 1.27V) and guarantees the reset signal remains asserted for at least 1ms to ensure proper microprocessor initialization. The MAX6389XS29D1-T does not support manual reset input (MR), distinguishing it from MAX6390 or MAX6384 variants.
What package type and footprint does MAX6389XS29D1-T use, and are land patterns available?
MAX6389XS29D1-T uses a 4-pin SC70 package (outline number 21-0098, package code X4+1), with dimensions of 1.2mm × 1.6mm × 0.9mm and gull-wing leads. Its recommended land pattern is numbered 90-0187, published by Maxim Integrated and compatible with standard reflow soldering profiles (peak 260°C). The MAX6389XS29D1-T footprint supports fine-pitch assembly and is optimized for high-density PCB layouts in portable and automotive electronics.
Is MAX6389XS29D1-T qualified for automotive applications, and what standards does it meet?
Yes, MAX6389XS29D1-T is AEC-Q100 qualified for automotive applications, as explicitly stated in the "Features" section and ordering information. It operates across the full automotive temperature range of –40°C to +125°C and meets stress testing requirements for humidity, thermal cycling, and mechanical shock. The "/V" suffix denotes automotive qualification, and MAX6389XS29D1-T carries this rating in its standard configuration - making it suitable for ADAS, body control, and infotainment systems requiring certified reliability.
MAX6389XS29D1-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:
- Obsolete
- 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:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6389XS29D1-T FAQ
1.How can I place an order for MAX6389XS29D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS29D1-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 MAX6389XS29D1-T reliable?
The price and inventory of MAX6389XS29D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS29D1-T is usually 5 days.
3.What payment methods are accepted for MAX6389XS29D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS29D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS29D1-T?
MAX6389XS29D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS29D1-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 MAX6389XS29D1-T?
For technical support, including MAX6389XS29D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS29D1-T requirements.
6.How does Aetrix verify that MAX6389XS29D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS29D1-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 MAX6389XS29D1-T meets industry standards.
7.What is the process for return or replacement of MAX6389XS29D1-T?
All MAX6389XS29D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS29D1-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 MAX6389XS29D1-T part is unused and in its original packaging.
Return procedure for MAX6389XS29D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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