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Analog Devices Inc./Maxim Integrated MAX6389XS33D2+T
- Part No.:
- MAX6389XS33D2+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS33D2+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,251
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Product details
Overview
MAX6389XS33D2+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 20ms minimum reset timeout period. It monitors VCC from +1.8V to +5.0V while consuming only 3μA at +1.8V, and includes auxiliary RESET IN input for dual-voltage monitoring in embedded power management systems.
For engineers reviewing the MAX6389XS33D2+T datasheet, MAX6389XS33D2+T pinout, MAX6389XS33D2+T application, or MAX6389XS33D2+T equivalent, this device is selected for battery-powered instrumentation requiring guaranteed reset assertion down to VCC = 1V, immunity to negative-going VCC transients, and secondary voltage supervision via external resistor-divider on RESET IN.
Technical Context
The MAX6389XS33D2+T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco. Its auxiliary RESET IN input compares against an internal +1.27V reference, enabling user-adjustable secondary reset thresholds via external resistor dividers.
This variant belongs to the MAX6387–MAX6389 subgroup featuring open-drain active-low RESET output and dedicated RESET IN terminal - distinct from push-pull or manual-reset variants. It guarantees valid reset state down to VCC = 1V and provides 4.5µs typical delay from RESET IN transition to RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.30V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges. |
| Reset Timeout Period | 20ms minimum - provides sufficient hold time for microprocessor initialization after power recovery. |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable instruments. |
| RESET Output Type | Open-drain active-low - requires external pullup; supports wired-OR configurations and level translation across voltage domains. |
| RESET IN Threshold | +1.27V internal reference - allows precise secondary voltage monitoring (e.g., I/O rail) using two-resistor divider network. |
| VCC Operating Range | +1.0V to +5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic families. |
| Reset Assertion Delay | 35µs max for VCC falling edge - rejects sub-microsecond supply glitches without false triggering. |
Pinout & Package
MAX6389XS33D2+T is packaged in a RoHS-compliant 4-pin SC70 (package code X4+1, outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained PCB layouts in portable equipment.
| 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 (active-low) | Open-drain output requiring external pullup; asserts low when VCC or RESET IN falls below threshold. |
| 3 | GND | Analog and digital ground reference; must be connected directly to system ground plane for noise immunity. |
| 4 | RESET IN | High-impedance auxiliary input compared to +1.27V reference; enables dual-rail monitoring via external resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and secondary rail via RESET IN - eliminates need for second supervisor IC in dual-supply systems. |
| Negative-going transient immunity | Rejects VCC glitches as short as 100ns with >100mV overdrive - prevents spurious resets in electrically noisy environments. |
| Guaranteed operation down to VCC = 1V | Valid RESET output state maintained even during severe brownout - ensures deterministic microcontroller behavior near shutdown. |
| Low input leakage on RESET IN | ±50nA max - permits use of high-value resistors (e.g., 1MΩ) in voltage dividers without significant threshold error. |
| Factory-trimmed precision threshold | 3.30V ±2.5% over full temperature range - removes need for external calibration or trimming components. |
Applications
| Industrial Sensor Node | Automotive Body Control Module |
|---|---|
Use Scenario: Battery-powered wireless sensor node monitoring temperature and humidity in remote locations. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and auxiliary 1.8V sensor rail via RESET IN; asserts reset if either drops below threshold during cold-start or battery sag. Use Value: Prevents firmware corruption during marginal power conditions and extends field lifetime by minimizing quiescent current drain (3μA). |
Use Scenario: Low-voltage subsystem in body control unit monitoring 5V microcontroller supply and 3.3V CAN transceiver rail. IC Role / Device Role / Timing Role: Primary reset generator with VCC = 5V monitored at 4.63V threshold and RESET IN configured for 3.3V rail at 3.30V threshold. Use Value: Enables single-chip dual-rail supervision meeting AEC-Q100 requirements without discrete comparators or voltage references. |
| Medical Point-of-Care Device | Programmable Logic Controller I/O Module |
Use Scenario: Handheld diagnostic instrument powered by rechargeable Li-ion battery with variable output (3.0V–4.2V). IC Role / Device Role / Timing Role: Monitors battery voltage directly at VCC and uses RESET IN to supervise regulated 2.5V analog front-end supply. Use Value: Ensures safe shutdown and controlled reboot when battery reaches end-of-discharge, avoiding data loss or analog measurement errors. |
Use Scenario: DIN-rail mounted I/O module with isolated 24V DC input converted to 5V and 3.3V rails. IC Role / Device Role / Timing Role: Provides synchronized reset to FPGA and microcontroller upon either 5V core or 3.3V I/O rail failure, using RESET IN for secondary monitoring. Use Value: Eliminates timing skew between processor and peripheral resets, improving system-level fault containment and recovery predictability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387XS33D2+T | Identical reset threshold (3.30V), timeout (20ms), and pinout; differs only in ordering suffix - functionally identical part. | No functional difference; both support RESET IN and open-drain output in 4-pin SC70. | Select MAX6387XS33D2+T only if MAX6389XS33D2+T is unavailable; no design change required. |
| TPS3808G33DBVR | 3.3V threshold, 20ms timeout, but push-pull active-low output; no RESET IN input; higher 12μA supply current at 1.8V. | Lacks dual-voltage monitoring capability; requires external circuitry for secondary rail supervision. | Choose only when RESET IN functionality is unnecessary and board layout accommodates different pinout (SOT-23-5 vs SC70-4). |
Compared with MAX6389XS33D2+T, MAX6387XS33D2+T offers identical supervision features and footprint, while TPS3808G33DBVR trades dual-rail capability for higher drive strength and simpler interface - making it suitable only for single-rail systems where RESET IN is unused.
Availability
MAX6389XS33D2+T is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, medical point-of-care devices, and programmable logic controller I/O modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6389XS33D2+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, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervision with configurable thresholds, timeouts, and dual-rail monitoring - engineered for battery longevity and robust operation in harsh environments.
FAQ
What is the exact reset threshold voltage of MAX6389XS33D2+T?
The MAX6389XS33D2+T has a factory-set nominal reset threshold of 3.30V, with guaranteed tolerance 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 and applies specifically to the "33" suffix in the part number.
Does MAX6389XS33D2+T support monitoring of a second voltage rail?
Yes, MAX6389XS33D2+T includes a dedicated RESET IN input that compares an external voltage against an internal +1.27V reference. By connecting a resistor divider to RESET IN, users can configure a secondary reset threshold - for example, to supervise a 1.8V or 2.5V rail alongside the primary 3.3V VCC supply.
What package type and dimensions does MAX6389XS33D2+T use?
MAX6389XS33D2+T is supplied in a lead-free, RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. Its land pattern is defined by Maxim's land pattern number 90-0187, and thermal resistance is θJA = 322.6°C/W on a multilayer board.
What is the minimum reset timeout period for MAX6389XS33D2+T?
The MAX6389XS33D2+T has a minimum reset timeout period of 20ms, indicated by the "D2" suffix in the part number. This duration is guaranteed under all operating conditions and ensures sufficient reset assertion time for microcontrollers to complete power-on initialization sequences.
Can MAX6389XS33D2+T operate reliably at very low supply voltages?
Yes, MAX6389XS33D2+T guarantees correct reset output logic state down to VCC = 1.0V, and its supply current remains as low as 3μA at +1.8V. This makes it suitable for deep-brownout scenarios and ultra-low-power applications where supply voltage may dip significantly before shutdown.
MAX6389XS33D2+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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6389XS33D2+T FAQ
1.How can I place an order for MAX6389XS33D2+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS33D2+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 MAX6389XS33D2+T reliable?
The price and inventory of MAX6389XS33D2+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS33D2+T is usually 5 days.
3.What payment methods are accepted for MAX6389XS33D2+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS33D2+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS33D2+T?
MAX6389XS33D2+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS33D2+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 MAX6389XS33D2+T?
For technical support, including MAX6389XS33D2+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS33D2+T requirements.
6.How does Aetrix verify that MAX6389XS33D2+T is sourced from the original manufacturer or authorized distributors?
All MAX6389XS33D2+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 MAX6389XS33D2+T meets industry standards.
7.What is the process for return or replacement of MAX6389XS33D2+T?
All MAX6389XS33D2+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS33D2+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 MAX6389XS33D2+T part is unused and in its original packaging.
Return procedure for MAX6389XS33D2+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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