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Analog Devices Inc./Maxim Integrated MAX6389XS23D3+
- Part No.:
- MAX6389XS23D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS23D3+.pdf
- Description:
- MAX6389 SC70, SINGLE LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:1,822
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Product details
Overview
MAX6389XS23D3+ from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 2.31V 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 supports industrial temperature range (–40°C to +125°C), used in portable battery-powered equipment and dual-voltage systems requiring reliable power-on reset.
For engineers reviewing the MAX6389XS23D3+ datasheet, MAX6389XS23D3+ pinout, MAX6389XS23D3+ application, or MAX6389XS23D3+ equivalent, this page delivers verified electrical parameters, SC70-4 package mapping, auxiliary voltage monitoring capability, reset timing accuracy over temperature, and real-world design implications for brownout immunity and manual reset integration.
Technical Context
The MAX6389XS23D3+ integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.31V threshold (±2.5% over –40°C to +125°C) and an independent auxiliary input (RESET IN) referenced to +1.27V, enabling dual-rail supervision. Its internal timer guarantees ≥140ms reset assertion after VCC recovery.
It features open-drain RESET output requiring external pull-up, guaranteed valid logic state down to VCC = 1.0V, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive - critical for noisy power rails in embedded controllers and intelligent instruments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.31V ±2.5% (–40°C to +125°C); ensures reliable detection of 2.5V rail brownout before µP malfunction. |
| Reset Timeout | 140ms minimum; holds µP in reset long enough for power stabilization and clock settling. |
| Supply Current | 3µA at +1.8V; enables multi-year battery life in portable medical or sensor devices. |
| Operating Voltage | 1.0V to 5.5V; supports valid reset assertion even during deep brownout or partial power loss. |
| RESET Output Type | Open-drain active-low; allows wired-OR configuration and level-shifting across voltage domains. |
| Auxiliary Input | RESET IN referenced to +1.27V; monitors secondary rail (e.g., I/O supply) via external resistor divider. |
| Tempco | 60ppm/°C; maintains threshold stability across automotive under-hood temperatures. |
Pinout & Package
MAX6389XS23D3+ is housed in a lead-free 4-pin SC70 package (package code X4-1), footprint-compatible with industry-standard SC70-4 layouts and suitable for high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets reset threshold reference point. |
| 2 | GND | Analog and digital ground reference; must be low-impedance connection to avoid false resets. |
| 3 | RESET IN | High-impedance auxiliary input compared to +1.27V reference; enables user-defined second-voltage supervision. |
| 4 | RESET | Open-drain active-low output; requires external pull-up resistor to host rail; asserts low during fault conditions. |
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). |
| Low-power operation | 3µA supply current at 1.8V allows integration into always-on battery-backed subsystems without measurable drain. |
| Guaranteed reset validity | RESET output remains logically valid down to VCC = 1.0V, preventing undefined µP states during deep brownout. |
| Negative transient immunity | Rejects VCC glitches ≤35µs duration at 100mV overdrive, eliminating spurious resets in electrically noisy environments. |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance over full temperature range eliminates need for external calibration or margining. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meter with separate 3.3V analog front-end and 1.8V digital core. IC Role / Device Role / Timing Role: Supervises both rails using VCC (3.3V) and RESET IN (1.8V via divider); asserts open-drain RESET to halt MCU until both supplies stabilize. Use Value: Prevents firmware corruption during battery insertion or low-battery sag by enforcing 140ms minimum reset hold time. | 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 VCC and 3.3V rail via RESET IN; provides fail-safe reset signal to ARM Cortex-M4 processor. Use Value: Dual-rail detection ensures safe startup even if one converter lags, avoiding partial initialization and lockup. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Under-hood BCM powered from 12V battery with LDOs generating 5V and 3.3V rails subject to load-dump transients. IC Role / Device Role / Timing Role: Detects brownout on main 5V rail and monitors 3.3V I/O rail; open-drain RESET interfaces directly with µP reset pin. Use Value: 60ppm/°C tempco and –40°C to +125°C rating ensure stable threshold across engine bay thermal cycling. | Use Scenario: Tamper-resistant electricity meter with backup supercapacitor maintaining RTC and memory during AC outage. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and supercap voltage via RESET IN; triggers controlled shutdown sequence upon drop below 2.31V. Use Value: 3µA quiescent current extends supercap hold-up time by >15%, enabling longer secure data logging during outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT23D3+ | Same electrical specs but in 6-pin µDFN-6 (L611-1) package; higher thermal dissipation and better high-frequency noise rejection. | Suitable for space-constrained industrial boards where µDFN's smaller pitch and lower inductance improve EMI performance. | Select when PCB layout allows µDFN and thermal management or EMI is critical; not pin-compatible with SC70-4. |
| TPS3808G125DBVR | TI part with 1.25V threshold, 200ms timeout, push-pull active-low output, and no auxiliary input; ±0.5% initial accuracy but wider tempco (100ppm/°C). | Best for single-rail systems needing tighter initial threshold tolerance but lacking dual-supply monitoring requirement. | Choose only if auxiliary voltage monitoring is unnecessary and higher accuracy at room temperature outweighs dual-rail capability. |
Compared with MAX6389XS23D3+, the µDFN-packaged MAX6389LT23D3+ offers improved thermal and EMI performance in dense layouts, while TPS3808G125DBVR trades dual-rail supervision for superior initial accuracy in single-rail applications - neither is pin-compatible, requiring board redesign.
Availability
MAX6389XS23D3+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6389XS23D3+ 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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family was engineered specifically for ultra-low-power, high-accuracy microprocessor supervision in battery-critical and thermally harsh environments - delivering guaranteed reset behavior from 1.0V up to 5.5V with dual-rail capability.
FAQ
What is the exact reset threshold voltage of MAX6389XS23D3+ and how stable is it over temperature?
The MAX6389XS23D3+ has a factory-set reset threshold of 2.31V with ±2.5% tolerance over the full operating range of –40°C to +125°C. This corresponds to a minimum threshold of 2.25V and maximum of 2.37V at temperature extremes. The 60ppm/°C tempco ensures minimal drift, making MAX6389XS23D3+ suitable for applications where supply rails must be monitored reliably across wide ambient conditions.
Does MAX6389XS23D3+ support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6389XS23D3+ includes a dedicated RESET IN pin referenced to an internal +1.27V comparator. To monitor a second voltage (e.g., 3.3V or 1.8V), connect an external resistor divider between that rail and ground, with the midpoint fed to RESET IN. The threshold is set by VTH = 1.27V × (R1/R2 + 1), allowing precise user-defined trip points without additional components beyond two resistors.
What is the function of the RESET output on MAX6389XS23D3+, and what external components are required?
The RESET output of MAX6389XS23D3+ is an open-drain active-low signal, meaning it pulls low during reset and floats high otherwise. An external pull-up resistor to the host µP's supply rail (e.g., 10kΩ to 3.3V) is mandatory. This configuration enables wired-OR reset buses, level translation, and compatibility with µPs requiring active-low reset inputs - no additional drivers or logic are needed.
How does MAX6389XS23D3+ behave during severe VCC brownout, and down to what voltage does it guarantee correct reset assertion?
MAX6389XS23D3+ guarantees correct RESET output logic state down to VCC = 1.0V, ensuring the microprocessor remains held in reset even during deep brownout events. Below 1.0V, internal circuitry may become nonfunctional, but the device is specified to maintain valid reset signaling throughout its entire 1.0V–5.5V operating range - a key reliability feature for battery-powered systems experiencing end-of-life voltage sag.
Is MAX6389XS23D3+ pin-compatible with legacy Maxim reset ICs like MAX809 or MAX6326?
No, MAX6389XS23D3+ is not pin-compatible with MAX809 (3-pin SOT23) or MAX6326 (4-pin SOT143). It uses a 4-pin SC70 package with pinout VCC-GND-RESET IN-RESET, whereas those legacy parts have different pin assignments and lack the RESET IN function. While electrically comparable in supervision function, MAX6389XS23D3+ requires a dedicated PCB footprint and cannot serve as a drop-in replacement without layout modification.
MAX6389XS23D3+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.31V, 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
MAX6389XS23D3+ FAQ
1.How can I place an order for MAX6389XS23D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS23D3+ 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 MAX6389XS23D3+ reliable?
The price and inventory of MAX6389XS23D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS23D3+ is usually 5 days.
3.What payment methods are accepted for MAX6389XS23D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS23D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS23D3+?
MAX6389XS23D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS23D3+ 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 MAX6389XS23D3+?
For technical support, including MAX6389XS23D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS23D3+ requirements.
6.How does Aetrix verify that MAX6389XS23D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6389XS23D3+ 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 MAX6389XS23D3+ meets industry standards.
7.What is the process for return or replacement of MAX6389XS23D3+?
All MAX6389XS23D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS23D3+, 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 MAX6389XS23D3+ part is unused and in its original packaging.
Return procedure for MAX6389XS23D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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