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Analog Devices Inc./Maxim Integrated MAX6389XS26D3
- Part No.:
- MAX6389XS26D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS26D3.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:989
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Product details
Overview
The MAX6389XS26D3 from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 2.63V reset threshold, 140ms minimum reset timeout, auxiliary RESET IN input for dual-voltage monitoring, and operation down to VCC = 1.0V. It consumes only 3µA at +1.8V and features ±2.5% reset threshold accuracy over –40°C to +125°C, designed for reliable power-on reset in battery-powered and industrial embedded systems.
For engineers reviewing the MAX6389XS26D3 datasheet, MAX6389XS26D3 pinout, MAX6389XS26D3 application, or MAX6389XS26D3 equivalent, this page delivers verified electrical parameters, SC70-4 package layout, dual-supply monitoring capability, reset timing behavior under brownout, and real-world selection guidance against functionally aligned alternatives.
Technical Context
The MAX6389XS26D3 implements a precision bandgap-based voltage comparator for VCC monitoring and a separate +1.27V reference comparator for the RESET IN pin, enabling independent detection of two supply rails. Its internal timer guarantees a minimum 140ms reset assertion after VCC or RESET IN recovers above their respective thresholds.
It uses BiCMOS process technology (647 transistors), supports negative-going VCC transient immunity up to 35µs for 100mV overdrive, and ensures valid reset output state down to VCC = 1.0V - critical for low-voltage brownout recovery in portable electronics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (factory-set, ±2.5% over –40°C to +125°C) - defines precise brownout detection point for primary supply |
| Reset Timeout | 140ms min - ensures µP remains held in reset long enough for stable clock and supply settling |
| Supply Current | 3µA at +1.8V - enables multi-year battery life in always-on monitoring applications |
| Operating Voltage | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level translation across mixed-voltage systems |
| RESET IN Threshold | +1.27V reference - enables user-defined secondary reset threshold via external resistor divider |
| VCC Transient Immunity | 35µs max for 100mV overdrive - suppresses false resets from short power glitches |
Pinout & Package
MAX6389XS26D3 is housed in a lead-free 4-pin SC70 package (package code X4-1), measuring 1.0mm × 1.0mm × 0.55mm, suitable for space-constrained PCB layouts in portable and IoT devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input; powers internal circuitry and serves as reference for primary reset comparator |
| 2 | GND | Analog and digital ground reference; must be low-impedance connection for accurate threshold sensing |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to +1.27V internal reference for dual-rail supervision |
| 4 | RESET | Open-drain active-low reset output; requires external pullup to host logic rail (e.g., 3.3V or 1.8V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN enables robust dual-supply systems (e.g., core + I/O) |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance over full temperature range eliminates need for external calibration |
| Ultra-low quiescent current | 3µA at 1.8V allows integration into energy-harvesting and coin-cell-powered designs without compromising runtime |
| Guaranteed reset validity | RESET output remains logically valid down to VCC = 1.0V - ensures deterministic behavior during deep undervoltage events |
| Transient-immune architecture | Internal filtering rejects sub-35µs VCC dips, preventing spurious resets in electrically noisy environments |
Applications
| Battery-Powered Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG sensor operating from CR2032 coin cell with 1.8V MCU core and 3.3V analog front-end. IC Role / Device Role / Timing Role: Supervises both 1.8V core and 3.3V analog supplies using VCC and RESET IN inputs; asserts open-drain RESET until both rails stabilize post-power-up. Use Value: Prevents firmware execution before ADC reference settles, eliminating data corruption during cold start. | Use Scenario: DIN-rail mounted PLC module with isolated 24V DC input converted to 5V system rail and 3.3V logic rail. IC Role / Device Role / Timing Role: Monitors 5V system supply on VCC and 3.3V logic rail on RESET IN; triggers unified reset pulse if either drops below threshold. Use Value: Ensures synchronized restart of FPGA, communication interface, and analog signal chain during field power interruptions. |
| Automotive Body Control Units | Smart Meter Power Sequencing |
Use Scenario: BCM microcontroller powered by automotive 5V LDO with backup 3.3V rail for real-time clock and nonvolatile memory. IC Role / Device Role / Timing Role: Uses VCC to supervise main 5V rail and RESET IN to monitor 3.3V backup rail; provides fail-safe reset if either supply collapses. Use Value: Guarantees safe shutdown and EEPROM write completion before complete power loss. | Use Scenario: Electricity meter with dual supplies: 3.3V for metrology ASIC and 1.8V for secure element. IC Role / Device Role / Timing Role: Configured with VCC = 3.3V and RESET IN = 1.8V rail; asserts reset if metrology supply sags or secure element supply fails. Use Value: Prevents partial writes to tamper-evident memory during asymmetric brownout conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387XS26D3 | Same 2.63V threshold, 140ms timeout, and RESET IN functionality; differs only in pinout - uses 6-pin µDFN instead of 4-pin SC70 | Requires PCB redesign due to different footprint and thermal pad; better suited for high-reliability industrial boards needing enhanced thermal dissipation | Select MAX6387XS26D3 when board layout allows larger package and thermal performance is prioritized over size. |
| TPS3808G125DBVR | 2.63V threshold and 200ms timeout; push-pull active-low output (no external pullup needed); higher ICC (12µA typical at 1.8V) | Lacks RESET IN input - supports single-rail supervision only; incompatible with dual-voltage monitoring use cases | Choose TPS3808G125DBVR only for space-constrained single-supply systems where open-drain flexibility is unnecessary. |
Compared with MAX6389XS26D3, MAX6387XS26D3 offers identical electrical behavior in a thermally superior but larger package, while TPS3808G125DBVR trades dual-rail capability for simpler push-pull drive and higher quiescent current - making MAX6389XS26D3 uniquely balanced for compact, dual-supply, ultra-low-power designs.
Availability
MAX6389XS26D3 is available at Aetrix Electronics and suitable for battery-powered medical sensors, industrial PLC I/O modules, automotive body control units, and smart meter power sequencing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6389XS26D3 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6381–MAX6390 family was designed specifically for low-voltage, low-power microprocessor reset supervision in space- and energy-constrained applications - emphasizing precision threshold accuracy, minimal current draw, and dual-rail monitoring capability.
FAQ
What is the exact reset threshold voltage of the MAX6389XS26D3?
The MAX6389XS26D3 has a factory-set reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is fixed and not adjustable; it is defined by the "26" suffix in the part number per Maxim's Reset Threshold table.
Does the MAX6389XS26D3 support monitoring of two independent power rails?
Yes, the MAX6389XS26D3 supports dual-rail supervision: VCC monitors the primary supply, while the dedicated RESET IN pin compares an external voltage to an internal +1.27V reference. This enables independent reset assertion if either rail falls below its configured threshold - confirmed in the Pin Description and Detailed Description sections.
What is the function of the RESET pin on the MAX6389XS26D3?
The RESET pin on the MAX6389XS26D3 is an open-drain active-low output. It sinks current when asserted (low) and floats when deasserted (high), requiring an external pullup resistor to the host logic rail. This configuration allows level shifting and wired-OR reset bus implementation, as specified in the Electrical Characteristics table under "Open-Drain RESET Output Voltage".
What package type and dimensions does the MAX6389XS26D3 use?
The MAX6389XS26D3 uses a lead-free 4-pin SC70 package (X4-1), with nominal dimensions of 1.0mm × 1.0mm × 0.55mm. The top-marking and pin 1 indicator are defined in the SC70 package outline drawing (21-0098), and the device is rated for reflow soldering per JEDEC J-STD-020.
How does the MAX6389XS26D3 behave during brief VCC voltage transients?
The MAX6389XS26D3 provides built-in immunity to short negative-going VCC transients: for a 100mV overdrive (i.e., VCC dipping 100mV below threshold), it tolerates pulses up to 35µs without asserting reset - as shown in the "Maximum Transient Duration vs. Reset Comparator Overdrive" graph. This prevents false resets caused by switching noise or load dumps.
MAX6389XS26D3 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:
- 2.63V, 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
MAX6389XS26D3 FAQ
1.How can I place an order for MAX6389XS26D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS26D3 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 MAX6389XS26D3 reliable?
The price and inventory of MAX6389XS26D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS26D3 is usually 5 days.
3.What payment methods are accepted for MAX6389XS26D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS26D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS26D3?
MAX6389XS26D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS26D3 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 MAX6389XS26D3?
For technical support, including MAX6389XS26D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS26D3 requirements.
6.How does Aetrix verify that MAX6389XS26D3 is sourced from the original manufacturer or authorized distributors?
All MAX6389XS26D3 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 MAX6389XS26D3 meets industry standards.
7.What is the process for return or replacement of MAX6389XS26D3?
All MAX6389XS26D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS26D3, 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 MAX6389XS26D3 part is unused and in its original packaging.
Return procedure for MAX6389XS26D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6389XS26D3 Tags
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MIC826SYMT-TR
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APX803S-31SA-7
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APX803L20-29SA-7
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EM6325CXSP5B-2.9+
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