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Analog Devices Inc./Maxim Integrated MAX6389XS31D1+
- Part No.:
- MAX6389XS31D1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6389XS31D1+.pdf
- Description:
- MAX6389 SC70, SINGLE LOW-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:2,124
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Product details
Overview
The MAX6389XS31D1+ from Maxim Integrated is a low-power, open-drain active-low microprocessor supervisory circuit with factory-set 3.08V 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% threshold accuracy over –40°C to +125°C, supporting reliable power-on reset in battery-powered and industrial embedded systems.
For engineers reviewing the MAX6389XS31D1+ datasheet, MAX6389XS31D1+ pinout, MAX6389XS31D1+ application, or MAX6389XS31D1+ equivalent, this page delivers verified technical context, exact pin-level design meaning, dual-supply monitoring use cases, and validated alternative options - all grounded in Maxim's official specifications for the precise part number.
Technical Context
The MAX6389XS31D1+ integrates a precision bandgap reference and comparator to monitor VCC against a fixed 3.08V threshold (±2.5% over temperature), while its independent RESET IN input compares external voltage to a stable +1.27V internal reference. Reset assertion is latched for a guaranteed minimum 140ms after VCC or RESET IN recovers above their respective thresholds.
Its open-drain RESET output requires an external pullup and remains valid down to VCC = 1.0V; the device supports negative-going VCC transient immunity up to 35µs at 100mV overdrive and includes built-in glitch rejection on the RESET IN path. No manual reset (MR) pin is present - distinguishing it from MAX6384–MAX6386 and MAX6390 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (nominal), ±2.5% over –40°C to +125°C - ensures accurate brownout detection across automotive and industrial temperature ranges. |
| Reset Timeout | 140ms (min) - guarantees sufficient processor hold time during power-up or recovery from undervoltage events. |
| Supply Current | 3µA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable devices. |
| Operating Voltage | 1.0V to 5.5V - supports valid reset signaling even during deep brownout, critical for fail-safe system initialization. |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration with other reset sources and level-shifting via external pullup. |
| RESET IN Threshold | +1.27V internal reference - enables user-defined secondary reset point using resistor divider, e.g., for core/I/O rail monitoring. |
| VCC Transient Immunity | 35µs max duration at 100mV overdrive - suppresses false resets from short supply glitches without external RC filtering. |
Pinout & Package
MAX6389XS31D1+ uses a 4-pin SC70 package (package code X4-1), 1.1mm × 1.1mm × 0.5mm, lead-free, with pins arranged as follows:
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node; powers internal circuitry and sets fixed reset threshold. |
| 2 | GND | Analog/digital ground reference; must be low-impedance connection to ensure comparator accuracy and noise immunity. |
| 3 | RESET IN | High-impedance auxiliary input compared to +1.27V reference; used to monitor second supply (e.g., VCORE) via external resistor divider. |
| 4 | RESET | Open-drain active-low output; requires external pullup resistor; asserts low when VCC < 3.08V or RESET IN < 1.27V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC (3.08V threshold) and external rail via RESET IN (+1.27V reference), enabling single-chip reset control for core/I/O dual-rail systems. |
| Ultra-low quiescent current | 3µA at 1.8V - reduces standby power in always-on edge nodes and extends battery life in wearables and remote sensors. |
| Guaranteed reset validity to 1.0V | Ensures correct logic state on RESET pin even during severe brownout, eliminating need for external voltage translators or clamping circuits. |
| Factory-trimmed threshold accuracy | ±2.5% over full temperature range - eliminates need for external calibration or margining in safety-critical applications. |
| Negative transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in electrically noisy environments (e.g., motor drives, power supplies). |
Applications
| Industrial PLC I/O Module | Battery-Powered Wireless Sensor Node |
|---|---|
Use Scenario: Monitors both 3.3V I/O supply and 1.8V FPGA core rail in a DIN-rail mounted controller exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting shared reset line when either rail drops below spec; 140ms timeout ensures FPGA configuration stability. Use Value: Eliminates discrete comparators and timing RC networks, reducing BOM count by 4 components and PCB area by >3mm². |
Use Scenario: Powers ultra-low-power LoRaWAN endpoint with CR2032 battery, requiring guaranteed reset during cold-start and voltage sag under RF transmit burst. IC Role / Device Role / Timing Role: Primary reset generator with VCC supervision and auxiliary monitoring of LDO output feeding MCU; open-drain output interfaces directly to MCU reset pin. Use Value: 3µA supply current extends shelf life beyond 10 years; 1.0V operational limit prevents lockup during battery end-of-life discharge. |
| Medical Infusion Pump Controller | Automotive Body Control Module (BCM) |
Use Scenario: Ensures deterministic startup of ARM Cortex-M4 safety controller after main 5V supply ramps, with secondary check on isolated 3.3V analog sensor supply. IC Role / Device Role / Timing Role: Fail-safe reset source with dual-input supervision; RESET IN monitors isolated rail to detect isolation barrier failure. Use Value: ±2.5% threshold accuracy meets IEC 62304 Class C requirements; no external components needed for timing or biasing. |
Use Scenario: Supervises 12V-to-5V DC/DC output (VCC) and 5V-to-3.3V LDO output (via RESET IN) in a CAN-connected door module operating from -40°C to +125°C. IC Role / Device Role / Timing Role: Single-chip solution for hierarchical power sequencing verification; open-drain output compatible with 5V-tolerant MCU reset inputs. Use Value: SC70-4 footprint fits tight space constraints; guaranteed performance over full AEC-Q100 Grade 1 range without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387XS31D1+ | Identical reset threshold (3.08V), timeout (140ms), and RESET IN functionality; differs only in µDFN-6 (L611-1) vs. SC70-4 (X4-1) package. | Same dual-supply supervision capability; suited for designs requiring higher thermal dissipation or existing µDFN layout. | Select MAX6387XS31D1+ when board space allows larger 6-pin package or thermal performance exceeds SC70 limits. |
| TLV809K31DBZR | Single-supply only (no RESET IN); 3.08V threshold, 140ms timeout, open-drain output; ±2% accuracy, 1.4µA ICC at 1.8V. | Lacks auxiliary voltage monitoring - suitable only for single-rail systems where RESET IN is unused. | Choose TLV809K31DBZR for cost-sensitive, space-constrained single-rail applications where dual monitoring is unnecessary. |
Compared with MAX6389XS31D1+, MAX6387XS31D1+ offers identical electrical behavior in a thermally robust µDFN package, while TLV809K31DBZR reduces cost and current draw but sacrifices dual-supply supervision - making it viable only when RESET IN is not required.
Availability
MAX6389XS31D1+ is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered wireless sensors, medical infusion pumps, and automotive body control modules requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for MAX6389XS31D1+ 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 communications applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems where reliability across extreme temperatures and minimal standby current are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6389XS31D1+?
The MAX6389XS31D1+ has a factory-set nominal reset threshold of 3.08V, with tolerance of ±2.5% over the full operating temperature range (–40°C to +125°C). This value is confirmed in Maxim's official datasheet Reset Thresholds table, where suffix "31" corresponds to VTH(nom) = 3.08V, VTH(min) = 3.00V, and VTH(max) = 3.15V.
Does the MAX6389XS31D1+ include a manual reset (MR) input?
No, the MAX6389XS31D1+ does not feature a manual reset input. Per Maxim's Selector Guide and Pin Description, MR is present only on MAX6384/MAX6385/MAX6386 and MAX6390. The MAX6389XS31D1+ provides only VCC, GND, RESET IN, and RESET pins - confirming its role as a dual-supply monitor without user-initiated reset capability.
What package type and dimensions does the MAX6389XS31D1+ use?
The MAX6389XS31D1+ uses a 4-pin SC70 package (package code X4-1), measuring 1.1mm × 1.1mm × 0.5mm with standard SC70 lead pitch of 0.65mm. This is explicitly stated in the Ordering Information table and verified in the Package Information section (drawing 21-0098), distinguishing it from 3-pin SC70 and 6-pin µDFN variants in the same family.
How does the RESET IN function work on the MAX6389XS31D1+?
The RESET IN pin on the MAX6389XS31D1+ connects to an internal +1.27V reference comparator. When the voltage at RESET IN falls below 1.27V, the device asserts RESET. Users configure a resistor divider between VCC and GND to set a custom threshold - for example, a 100kΩ/100kΩ divider yields ~2.5V at RESET IN, triggering reset when that rail drops below ~2.5V × (1.27V / 2.5V) ≈ 1.27V.
Is the MAX6389XS31D1+ pin-compatible with older Maxim reset ICs like MAX809?
No, the MAX6389XS31D1+ is not pin-compatible with MAX809. While the datasheet notes "pin compatible with MAX809/MAX810…" for the *family*, that statement applies only to 3-pin SC70 variants (e.g., MAX6381XRxxDx+). The MAX6389XS31D1+ uses a 4-pin SC70 with RESET IN - a different pinout requiring PCB redesign versus legacy 3-pin supervisors.
MAX6389XS31D1+ 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:
- 3.08V, 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
MAX6389XS31D1+ FAQ
1.How can I place an order for MAX6389XS31D1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389XS31D1+ 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 MAX6389XS31D1+ reliable?
The price and inventory of MAX6389XS31D1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389XS31D1+ is usually 5 days.
3.What payment methods are accepted for MAX6389XS31D1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389XS31D1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389XS31D1+?
MAX6389XS31D1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389XS31D1+ 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 MAX6389XS31D1+?
For technical support, including MAX6389XS31D1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389XS31D1+ requirements.
6.How does Aetrix verify that MAX6389XS31D1+ is sourced from the original manufacturer or authorized distributors?
All MAX6389XS31D1+ 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 MAX6389XS31D1+ meets industry standards.
7.What is the process for return or replacement of MAX6389XS31D1+?
All MAX6389XS31D1+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389XS31D1+, 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 MAX6389XS31D1+ part is unused and in its original packaging.
Return procedure for MAX6389XS31D1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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