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Analog Devices Inc./Maxim Integrated MAX6389LT31D3+T
- Part No.:
- MAX6389LT31D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6389LT31D3+T.pdf
- Description:
- IC MPU/RESET CIRC 3.08V 6-UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:40,000
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Product details
Overview
MAX6389LT31D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 3.08V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, enabling use in battery-powered instrumentation and embedded controllers requiring reliable power-up/brownout detection.
For engineers reviewing the MAX6389LT31D3+T datasheet, MAX6389LT31D3+T pinout, MAX6389LT31D3+T application, or MAX6389LT31D3+T equivalent, key selection criteria include its open-drain reset architecture, dual-supply monitoring capability via RESET IN, guaranteed reset validity down to VCC = 1V, and AEC-Q100-qualified variants for automotive-grade designs.
Technical Context
The MAX6389LT31D3+T integrates a precision voltage comparator monitoring VCC against a fixed 3.08V threshold and a second comparator monitoring an external voltage applied to RESET IN against an internal 1.27V reference. Reset assertion occurs if either monitored voltage falls below its respective threshold.
An internal timer enforces a minimum 140ms reset timeout after VCC or RESET IN recovers; the open-drain RESET output requires an external pullup resistor and guarantees VOL ≤ 0.3V at ISINK = 1.2mA (VCC ≥ 2.5V) and ≤ 0.3V at ISINK = 80µA (VCC ≥ 1.0V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.5% over -40°C to +125°C - ensures stable brownout detection across industrial temperature range |
| Reset Timeout | 140ms minimum - provides sufficient hold time for microprocessor initialization after power recovery |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered portable equipment |
| Operating Voltage | 1.0V to 5.5V - supports valid reset signaling even during deep brownout conditions |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level translation with external pullup |
| RESET IN Threshold | 1.27V ±2.5% - enables user-defined secondary reset point via resistor divider on RESET IN pin |
| Quiescent Supply Range | VCC = 1.0V to 5.5V - guarantees functional reset state down to near-dead-battery voltages |
Pinout & Package
MAX6389LT31D3+T is housed in a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), RoHS-compliant and rated for -40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and voltage monitor node - powers internal circuitry and triggers reset when falling below 3.08V |
| 2 | GND | Ground reference for all internal comparators and timing circuits - must be low-impedance for accurate threshold tracking |
| 3 | RESET IN | Auxiliary voltage monitor input - compared to 1.27V internal reference; enables dual-rail supervision without external components |
| 4 | RESET | Open-drain active-low reset output - sinks current when asserted; requires external pullup for logic-high state during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN - eliminates need for second supervisor IC in dual-supply systems |
| Negative-going transient immunity | Immune to VCC glitches ≤ 35µs duration at 100mV overdrive - prevents spurious resets in noisy power environments |
| Guaranteed reset validity to 1V | RESET output remains logically valid (low/high) down to VCC = 1V - ensures deterministic behavior during deep undervoltage |
| Low quiescent current | 3μA at 1.8V - extends battery life in always-on sensor nodes and portable medical devices |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance over full temperature range - reduces calibration overhead in production test |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit |
|---|---|
|
Use Scenario: Monitors both 5V system rail and 3.3V microcontroller core supply in a CAN-connected I/O module operating in harsh factory environments. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting open-drain RESET to halt MCU execution until both supplies stabilize post-power-up or brownout. Use Value: Prevents firmware corruption by guaranteeing 140ms minimum reset hold time while enabling independent fault detection on two rails using single IC. |
Use Scenario: Supervises 12V-derived 5V domain and isolated 3.3V MCU domain in a body control module subject to load-dump transients and cold-crank undervoltage. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation via VCC and RESET IN inputs, with open-drain output compatible with automotive-level pullup networks. Use Value: Eliminates need for discrete resistor dividers on secondary rail; ±2.5% threshold accuracy ensures compliance with ISO 16750-2 undervoltage test profiles. |
| Portable Medical Sensor Hub | Battery-Powered Smart Meter |
|
Use Scenario: Powers from single Li-ion cell (2.7–4.2V) and monitors both main 3.3V rail and regulated 1.8V sensor interface rail in a wearable ECG device. IC Role / Device Role / Timing Role: Low-current (3μA) supervisor ensuring safe boot sequence and brownout recovery without draining battery during sleep mode. Use Value: 140ms timeout aligns with typical MCU bootloader initialization window; open-drain RESET allows shared reset bus across multiple subsystems. |
Use Scenario: Embedded in AMI smart meter with separate 3.3V communication processor and 1.2V metrology ASIC, requiring coordinated reset under grid voltage sags. IC Role / Device Role / Timing Role: Dual-threshold supervisor triggering reset when either rail drops - critical for maintaining data integrity during utility-side disturbances. Use Value: RESET IN pin configured for 1.2V rail monitoring via resistor divider; 3.08V VCC threshold covers nominal 3.3V rail with margin for aging and tolerance stack-up. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS31D3+T | Same 3.08V threshold and 140ms timeout, but in 4-pin SC70 with different package code (XS vs LT); identical electrical specs and pinout | Identical functionality; differs only in packaging and ordering suffix - suitable for same PCB footprint | Select when standard SC70 variant is preferred over lead-free μDFN-compatible marking; no design change required |
| TLV809E30DBZR | 3.0V reset threshold (±1%), 140ms timeout, push-pull active-low output, no RESET IN input, 0.9μA ICC at 1.8V | Lacks auxiliary voltage monitoring; optimized for ultra-low-power single-rail systems where dual supervision is unnecessary | Choose for cost-sensitive, single-supply applications where RESET IN functionality is not needed and lower ICC is prioritized |
Compared with MAX6389LT31D3+T, MAX6389XS31D3+T offers identical supervision performance in an alternative SC70 package variant, while TLV809E30DBZR trades dual-rail capability for lower quiescent current and simpler push-pull output - making it suitable only for single-supply designs without auxiliary monitoring needs.
Availability
MAX6389LT31D3+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensor hubs, and battery-powered smart meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6389LT31D3+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 industrial, automotive, and computing applications, emphasizing high reliability and extended temperature operation.
The MAX6381–MAX6390 family delivers low-power, high-accuracy microprocessor supervisory circuits targeting space-constrained, battery-sensitive, and mission-critical embedded systems requiring dual-voltage monitoring and AEC-Q100 qualification options.
FAQ
What is the exact reset threshold voltage of MAX6389LT31D3+T and how stable is it over temperature?
The MAX6389LT31D3+T has a factory-set reset threshold of 3.08V with ±2.5% accuracy over the full -40°C to +125°C operating range. This stability is achieved through laser-trimmed internal references and BiCMOS process optimization, ensuring reliable brownout detection without external calibration in industrial and automotive environments.
Does MAX6389LT31D3+T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6389LT31D3+T supports dual-voltage supervision via its dedicated RESET IN pin, which compares an external voltage to an internal 1.27V reference. A simple resistor divider on RESET IN sets the secondary threshold - for example, a 100kΩ/100kΩ divider yields ~2.54V detection - enabling coordinated reset across two independent power domains without additional ICs.
What is the function of the RESET output on MAX6389LT31D3+T, and what external components are required?
The RESET output of MAX6389LT31D3+T is an open-drain active-low signal requiring an external pullup resistor to the target logic rail (e.g., 3.3V or 5V). When asserted, it sinks up to 1.2mA (VCC ≥ 2.5V); when deasserted, it presents high impedance. No pullup is integrated, allowing flexible voltage translation and wired-OR reset bus configurations.
Can MAX6389LT31D3+T operate reliably during deep brownout conditions, and down to what VCC level does it guarantee correct reset behavior?
MAX6389LT31D3+T guarantees valid RESET output logic states down to VCC = 1.0V - meaning it correctly asserts low during undervoltage and releases high after recovery even as supply collapses. This ensures deterministic microprocessor reset sequencing in battery-powered systems experiencing severe voltage sag before shutdown.
Is MAX6389LT31D3+T qualified for automotive applications, and what evidence supports this claim?
MAX6389LT31D3+T is offered in /V automotive-qualified variants (e.g., MAX6389XS31D3/V+T), explicitly stated as AEC-Q100 qualified in the datasheet's Features section and Ordering Information table. While the specific MAX6389LT31D3+T suffix denotes lead-free SC70 packaging, its underlying die and characterization meet AEC-Q100 stress test requirements for Grade 1 (-40°C to +125°C) operation.
MAX6389LT31D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.08V, 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:
- 6-µDFN (1.5x1)
MAX6389LT31D3+T FAQ
1.How can I place an order for MAX6389LT31D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389LT31D3+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 MAX6389LT31D3+T reliable?
The price and inventory of MAX6389LT31D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389LT31D3+T is usually 5 days.
3.What payment methods are accepted for MAX6389LT31D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389LT31D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389LT31D3+T?
MAX6389LT31D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389LT31D3+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 MAX6389LT31D3+T?
For technical support, including MAX6389LT31D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389LT31D3+T requirements.
6.How does Aetrix verify that MAX6389LT31D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6389LT31D3+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 MAX6389LT31D3+T meets industry standards.
7.What is the process for return or replacement of MAX6389LT31D3+T?
All MAX6389LT31D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389LT31D3+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 MAX6389LT31D3+T part is unused and in its original packaging.
Return procedure for MAX6389LT31D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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