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Analog Devices Inc./Maxim Integrated MAX6389XS32D1+
- Part No.:
- MAX6389XS32D1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS32D1+.pdf
- Description:
- MAX6389 SC70, SINGLE LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:16,410
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Product details
Overview
MAX6389XS32D1+ from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit designed to monitor +3.20V supply voltage in embedded systems. It features ±2.5% reset threshold accuracy over -40°C to +125°C, 140ms minimum VCC reset timeout, and guaranteed valid reset output down to VCC = 1.0V. It includes an auxiliary RESET IN input for dual-voltage monitoring and consumes only 3µA at +1.8V - ideal for battery-powered IoT sensors and portable medical devices.
For engineers reviewing the MAX6389XS32D1+ datasheet, MAX6389XS32D1+ pinout, MAX6389XS32D1+ application, or MAX6389XS32D1+ equivalent, key selection considerations include its 3.20V factory-set reset threshold, 140ms timeout, SC70-4 open-drain output configuration, auxiliary voltage monitoring capability, and operation across industrial temperature range (-40°C to +125°C).
Technical Context
The MAX6389XS32D1+ implements a precision bandgap reference and comparator architecture to detect VCC drops below 3.20V with ±2.5% tolerance over full temperature range. Its internal timer ensures reset remains asserted for ≥140ms after VCC recovers above threshold.
It integrates a dedicated auxiliary comparator referenced to +1.27V, enabling independent monitoring of a second voltage (e.g., I/O rail) via external resistor divider. Reset asserts if either VCC < 3.20V or RESET IN < 1.27V - supporting dual-rail brownout detection without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.20V ±2.5% - factory-trimmed for precise power-rail supervision at nominal 3.3V systems |
| VCC Reset Timeout | 140ms min - ensures µP initialization completes before release, preventing premature code execution |
| Supply Current | 3µA at +1.8V - enables multi-year operation on coin-cell batteries in always-on monitoring nodes |
| Operating Voltage | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration with other reset sources and flexible pull-up voltage selection |
| Auxiliary Input | RESET IN with +1.27V reference - supports user-defined secondary threshold via resistor divider (e.g., 1.8V, 2.5V rails) |
| Temp Range | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and outdoor edge-compute deployments |
Pinout & Package
MAX6389XS32D1+ is housed in a lead-free 4-pin SC70 package (X4-1), measuring 1.0mm × 1.0mm × 0.55mm, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node - powers internal circuitry and sets fixed 3.20V reset threshold |
| 2 | GND | Analog/digital ground reference - must be low-impedance connection to minimize noise-induced false resets |
| 3 | RESET IN | Auxiliary voltage monitor input - compared to internal +1.27V reference; enables dual-supply supervision |
| 4 | RESET | Open-drain active-low reset output - requires external pull-up; asserts low during fault and remains low ≥140ms post-recovery |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC (3.20V) and external rail via RESET IN - eliminates need for second supervisor IC |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs (at 100mV overdrive) - prevents spurious resets in electrically noisy environments |
| Low-VCC reset validity | Guaranteed correct logic state down to VCC = 1.0V - ensures reliable reset assertion during deep undervoltage events |
| Factory-trimmed accuracy | ±2.5% threshold tolerance over -40°C to +125°C - removes need for external calibration or margining |
| Ultra-low quiescent current | 3µA at +1.8V - extends battery life in maintenance-free sensor nodes and wearable electronics |
Applications
| Battery-Powered Telematics | Industrial PLC I/O Modules |
|---|---|
Use Scenario: GPS tracker operating on Li-SOCl₂ battery with 3.3V main rail and 1.8V MCU core rail. IC Role / Device Role / Timing Role: Primary VCC supervisor for 3.3V rail and auxiliary monitor for 1.8V core via RESET IN divider. Use Value: Prevents MCU lockup during cold-start voltage sag while enabling single-chip dual-rail supervision - reducing BOM count and PCB area. | Use Scenario: DIN-rail mounted PLC module with isolated 24V input, 5V logic, and 3.3V communication interface. IC Role / Device Role / Timing Role: Monitors 5V logic rail (VCC) and 3.3V interface rail (via RESET IN) to detect independent brownouts. Use Value: Enables system-level fault isolation - distinguishes between logic supply failure vs. interface supply failure - improving diagnostic accuracy and uptime. |
| Medical Wearable Sensors | Automotive Body Control Units |
Use Scenario: ECG patch powered by CR2032 coin cell, using 3.3V analog front-end and 1.2V ultra-low-power MCU. IC Role / Device Role / Timing Role: Supervises 3.3V rail (VCC) and monitors 1.2V core via RESET IN (configured for ~1.25V threshold). Use Value: Ensures safe shutdown and restart during battery depletion - critical for regulatory compliance and patient safety in Class IIa devices. | Use Scenario: Under-dash BCM managing door locks, lighting, and CAN transceivers, exposed to -40°C to +105°C ambient. IC Role / Device Role / Timing Role: Monitors 5V MCU supply (VCC) and 3.3V CAN PHY rail (via RESET IN) across full automotive temperature range. Use Value: Maintains deterministic reset behavior despite thermal cycling and load dump transients - meeting AEC-Q100 Grade 2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389LT32D1+ | Same electrical specs but in 6-pin µDFN-6 (L611-1) package - larger footprint, better thermal dissipation | Suitable for high-reliability industrial boards where µDFN solder joint robustness is prioritized over size | Select when board assembly uses µDFN-reflow processes and thermal margin >0.5°C is required at +125°C ambient |
| TPS3808G32DBVR | TI part with identical 3.2V threshold and 140ms timeout, but push-pull active-low output and no RESET IN input | Lacks auxiliary voltage monitoring - requires separate supervisor or discrete solution for dual-rail systems | Choose only for single-rail applications where open-drain flexibility is unnecessary and TI supply chain preference applies |
Compared with MAX6389LT32D1+, the MAX6389XS32D1+ saves 0.5mm² PCB area and enables tighter routing in dense layouts; versus TPS3808G32DBVR, it adds dual-supply supervision capability at the cost of requiring an external pull-up resistor - a trade-off justified in systems needing fault isolation.
Availability
MAX6389XS32D1+ is available at Aetrix Electronics and suitable for battery-powered telematics, industrial PLC I/O modules, medical wearables, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6389XS32D1+ 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 delivers ultra-low-power, high-accuracy reset supervision for resource-constrained embedded systems - emphasizing factory-trimmed thresholds, wide temperature operation, and multi-rail monitoring in minimal packages.
FAQ
What is the exact reset threshold voltage of the MAX6389XS32D1+?
The MAX6389XS32D1+ has a factory-set reset threshold of 3.20V, with ±2.5% tolerance over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during production and specified in the Reset Thresholds table of the datasheet. The '32' suffix in MAX6389XS32D1+ explicitly denotes the 3.20V threshold variant.
Does the MAX6389XS32D1+ support monitoring of a second voltage rail?
Yes, the MAX6389XS32D1+ includes a dedicated RESET IN input that compares an external voltage to an internal +1.27V reference. By connecting a resistor divider to RESET IN, users can configure supervision of a second rail (e.g., 1.8V or 2.5V). Reset asserts if either VCC falls below 3.20V or the voltage at RESET IN drops below +1.27V - enabling true dual-supply fault detection in a single IC.
What is the function of the RESET pin on the MAX6389XS32D1+?
The RESET pin on the MAX6389XS32D1+ is an open-drain active-low output. It pulls low when VCC < 3.20V or RESET IN < +1.27V, and remains low for ≥140ms after both conditions clear. An external pull-up resistor is mandatory. This configuration allows multiple reset sources to share a common reset bus (wired-OR) and supports level-shifting to different logic families - a key advantage over push-pull alternatives.
What package type and dimensions does the MAX6389XS32D1+ use?
The MAX6389XS32D1+ is packaged in a lead-free 4-pin SC70 (X4-1) package measuring 1.0mm × 1.0mm × 0.55mm. Pin 1 is VCC, Pin 2 is GND, Pin 3 is RESET IN, and Pin 4 is RESET. This ultra-compact outline is optimized for high-density PCBs in portable and space-limited applications, with thermal characteristics validated per JEDEC standards for reflow compatibility.
How does the MAX6389XS32D1+ behave during deep brownout conditions?
The MAX6389XS32D1+ guarantees correct reset output logic state down to VCC = 1.0V - meaning it continues asserting reset (pulling RESET low) even as supply voltage collapses. This ensures the microprocessor remains held in reset until power is fully removed or recovered, preventing erratic execution during undervoltage transients. Unlike many supervisors that fail silently below 1.5V, this behavior is tested and specified across -40°C to +125°C.
MAX6389XS32D1+ 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:
- 3.2V, 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
MAX6389XS32D1+ FAQ
1.How can I place an order for MAX6389XS32D1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS32D1+ 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 MAX6389XS32D1+ reliable?
The price and inventory of MAX6389XS32D1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS32D1+ is usually 5 days.
3.What payment methods are accepted for MAX6389XS32D1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS32D1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS32D1+?
MAX6389XS32D1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS32D1+ 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 MAX6389XS32D1+?
For technical support, including MAX6389XS32D1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS32D1+ requirements.
6.How does Aetrix verify that MAX6389XS32D1+ is sourced from the original manufacturer or authorized distributors?
All MAX6389XS32D1+ 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 MAX6389XS32D1+ meets industry standards.
7.What is the process for return or replacement of MAX6389XS32D1+?
All MAX6389XS32D1+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS32D1+, 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 MAX6389XS32D1+ part is unused and in its original packaging.
Return procedure for MAX6389XS32D1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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