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Analog Devices Inc./Maxim Integrated MAX6389XS33D1-T
- Part No.:
- MAX6389XS33D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS33D1-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,985
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Product details
Overview
MAX6389XS33D1-T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 3.30V ±2.5% reset threshold, and 140ms minimum VCC reset timeout. It monitors single supply voltage (VCC) and includes auxiliary RESET IN input for dual-voltage monitoring, operating across -40°C to +125°C in 4-pin SC70 package. Used in portable battery-powered equipment requiring reliable brownout detection.
For engineers reviewing the MAX6389XS33D1-T datasheet, MAX6389XS33D1-T pinout, MAX6389XS33D1-T application, or MAX6389XS33D1-T equivalent, key selection criteria include its 3.30V reset threshold accuracy over temperature, 140ms timeout, open-drain output requiring external pullup, auxiliary voltage monitoring capability, and AEC-Q100-qualified automotive variant availability.
Technical Context
The MAX6389XS33D1-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy over -40°C to +125°C and 60ppm/°C tempco. Its internal timer guarantees minimum 140ms reset assertion after VCC recovers above 3.30V.
It features dual-monitoring architecture: primary VCC sensing and secondary RESET IN input referenced to 1.27V internal reference, enabling user-configurable second-supply monitoring via external resistor divider. Reset asserts if either VCC < 3.30V or RESET IN < 1.27V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.30V ±2.5% (±82.5mV) over -40°C to +125°C - ensures stable brownout detection across automotive and industrial temperature ranges |
| VCC Reset Timeout | 140ms minimum - holds processor in reset long enough for power stabilization after recovery from undervoltage |
| Supply Current | 3μA at +1.8V, 6μA at +3.6V - enables multi-year operation in battery-backed systems |
| Output Type | Open-drain active-low - requires external pullup; supports wired-OR reset bus configurations and mixed-voltage interfacing |
| Auxiliary Input | RESET IN comparator with 1.27V reference - allows monitoring of second supply (e.g., I/O rail) using external resistor divider |
| Operating Voltage | 1.0V to 5.5V VCC - guarantees valid reset state down to 1.0V, supporting ultra-low-voltage microcontrollers |
| Reset Propagation Delay | 35μs max (VCC falling at 10mV/µs) - fast response to rapid supply collapse without false triggering on transients |
Pinout & Package
MAX6389XS33D1-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), footprint-compatible with industry-standard 0.65mm pitch layouts. Thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor; powers internal circuitry and sets reset threshold reference |
| 2 | RESET (open-drain) | Active-low reset output requiring external pullup; sinks up to 3.2mA at VCC ≥ 4.5V; remains valid down to VCC = 1.0V |
| 3 | RESET IN | Auxiliary high-impedance input compared to 1.27V internal reference; enables second-supply monitoring via resistor divider |
| 4 | GND | Analog and digital ground reference; must be connected directly to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring | Simultaneous VCC (3.30V) and RESET IN (1.27V-referenced) comparators enable independent brownout detection for core and I/O rails |
| Negative-going transient immunity | Rejects VCC glitches ≤ 35μs duration when overdrive is < 100mV - prevents spurious resets in noisy power environments |
| Low-voltage operation guarantee | Reset output logic state remains valid down to VCC = 1.0V - ensures deterministic behavior during deep brownout |
| Factory-trimmed precision | ±2.5% reset threshold tolerance over full temperature range eliminates need for external calibration or trimming components |
| Automotive qualification option | /V suffix variants meet AEC-Q100 Grade 1 requirements - validated for under-hood and infotainment applications |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Wearable ECG sensor powered by coin cell with 3.3V LDO output and separate 1.8V MCU core rail. IC Role / Device Role / Timing Role: MAX6389XS33D1-T monitors 3.3V I/O supply while RESET IN monitors 1.8V core via resistor divider; asserts reset if either drops below threshold. Use Value: Prevents corrupted data acquisition during battery sag by holding MCU in reset until both supplies stabilize post-brownout. |
Use Scenario: BCM microcontroller supplied by 5V main rail and 3.3V CAN transceiver rail, operating in under-dash environment. IC Role / Device Role / Timing Role: MAX6389XS33D1-T supervises 5V rail (3.30V threshold) and RESET IN monitors 3.3V rail (via 1.27V reference + divider); provides 140ms reset hold time. Use Value: Ensures safe CAN bus reinitialization after ignition cycling by preventing premature firmware execution before power rails settle. |
| Industrial PLC I/O Modules | Battery-Powered IoT Gateways |
|
Use Scenario: DIN-rail mounted PLC module with isolated 24V-to-3.3V DC-DC converter powering control logic and field I/O drivers. IC Role / Device Role / Timing Role: MAX6389XS33D1-T monitors 3.3V logic supply; RESET IN monitors isolated 5V I/O driver supply via resistor network. Use Value: Guarantees synchronized reset of logic and interface circuitry during line surges or converter faults, avoiding partial initialization states. |
Use Scenario: Cellular IoT gateway powered by Li-SOCl₂ battery with 3.3V system rail and 1.8V modem rail, deployed in remote locations. IC Role / Device Role / Timing Role: MAX6389XS33D1-T supervises main 3.3V rail; RESET IN configured for 1.8V threshold to protect modem during deep discharge. Use Value: Extends field lifetime by enabling graceful shutdown and memory preservation when battery voltage decays below operational limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS33D2-T | Same 3.30V threshold and open-drain output, but 280ms VCC reset timeout (vs. 140ms) | Suitable where longer reset hold time is required for slower power-up sequences or higher-capacitance rails | Select MAX6389XS33D2-T when system stabilization exceeds 140ms; otherwise MAX6389XS33D1-T minimizes unnecessary reset duration. |
| TLV809K33DBZR | 3.3V threshold, push-pull active-low output, no RESET IN input, 200ms timeout, lower quiescent current (0.5μA) | Lacks auxiliary monitoring; suited for single-rail systems where space or cost constraints preclude dual-input supervision | Choose TLV809K33DBZR for cost-sensitive single-supply designs; retain MAX6389XS33D1-T when dual-rail monitoring is mandatory. |
Compared with MAX6389XS33D2-T, the MAX6389XS33D1-T reduces reset assertion time by half-critical for fast-booting embedded systems-while maintaining identical threshold accuracy and dual-monitoring capability. Against TLV809K33DBZR, it trades lower quiescent current for essential RESET IN functionality, making it irreplaceable in dual-voltage architectures.
Availability
MAX6389XS33D1-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, automotive body control modules, industrial PLC I/O modules, and dual-voltage embedded systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX6389XS33D1-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 microprocessor reset circuits optimized for battery longevity, wide-temperature operation, and robust power-supply supervision in safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6389XS33D1-T and how stable is it over temperature?
The MAX6389XS33D1-T has a factory-set nominal reset threshold of 3.30V with ±2.5% tolerance over the full -40°C to +125°C operating range. This corresponds to ±82.5mV absolute variation. Its 60ppm/°C tempco ensures minimal drift across temperature, and the device guarantees correct reset assertion even at extreme temperatures without external calibration. The MAX6389XS33D1-T maintains this specification without requiring derating or additional compensation circuitry.
Does the MAX6389XS33D1-T support monitoring of a second voltage rail, and how is it implemented?
Yes, the MAX6389XS33D1-T includes a dedicated RESET IN input that compares an external voltage to an internal 1.27V reference. To monitor a second rail (e.g., 1.8V or 5.0V), connect it to RESET IN through a resistor divider configured using R1 = R2 × [(VINTH/1.27V) − 1]. The MAX6389XS33D1-T asserts reset if either VCC falls below 3.30V or the divided RESET IN voltage drops below 1.27V, enabling true dual-supply supervision in compact form factor.
What is the function of the open-drain RESET output on the MAX6389XS33D1-T and what external component is required?
The MAX6389XS33D1-T features an open-drain active-low RESET output, meaning it can only sink current to pull the line low and requires an external pullup resistor to VCC (or another compatible voltage) to achieve high state. This configuration supports wired-OR reset buses, level translation between different logic families, and fault-tolerant reset signaling. A typical 10kΩ–100kΩ pullup is used; the MAX6389XS33D1-T guarantees valid output down to VCC = 1.0V, ensuring deterministic behavior even during deep brownout conditions.
How does the MAX6389XS33D1-T handle short negative-going transients on the VCC line?
The MAX6389XS33D1-T incorporates built-in immunity to short-duration negative-going VCC transients (glitches). Its reset comparator rejects pulses ≤35μs wide when the overdrive (VTH − VCC) is less than 100mV, as verified in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph. This prevents spurious resets caused by switching noise or coupling. For enhanced immunity, a 0.1μF ceramic capacitor placed close to the VCC pin is recommended, further improving robustness in electrically noisy environments.
Is the MAX6389XS33D1-T qualified for automotive applications, and what packaging options are available?
The MAX6389XS33D1-T itself is not automotive-qualified, but the /V-suffix variant MAX6389XS33D1/V+T is AEC-Q100 Grade 1 qualified for automotive use. Both versions share identical electrical specifications and 4-pin SC70 package (RoHS-compliant, lead-free). The /V version undergoes extended temperature stress testing and failure analysis per AEC-Q100 requirements, making it suitable for under-hood and infotainment applications where reliability under thermal cycling and vibration is critical. The MAX6389XS33D1-T is intended for industrial and commercial-grade systems.
MAX6389XS33D1-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:
- 3.3V, 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
MAX6389XS33D1-T FAQ
1.How can I place an order for MAX6389XS33D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS33D1-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 MAX6389XS33D1-T reliable?
The price and inventory of MAX6389XS33D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS33D1-T is usually 5 days.
3.What payment methods are accepted for MAX6389XS33D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS33D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS33D1-T?
MAX6389XS33D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS33D1-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 MAX6389XS33D1-T?
For technical support, including MAX6389XS33D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS33D1-T requirements.
6.How does Aetrix verify that MAX6389XS33D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS33D1-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 MAX6389XS33D1-T meets industry standards.
7.What is the process for return or replacement of MAX6389XS33D1-T?
All MAX6389XS33D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS33D1-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 MAX6389XS33D1-T part is unused and in its original packaging.
Return procedure for MAX6389XS33D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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