My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6389LT23D3+T
- Part No.:
- MAX6389LT23D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6389LT23D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6389LT23D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.31V VCC 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, used in battery-powered instrumentation and dual-rail embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6389LT23D3+T datasheet, MAX6389LT23D3+T pinout, MAX6389LT23D3+T application, or MAX6389LT23D3+T equivalent, key selection criteria include its 2.31V threshold accuracy, 140ms VCC reset delay, open-drain output requiring external pullup, RESET IN comparator referenced to +1.27V, and guaranteed valid reset state down to VCC = 1V.
Technical Context
The MAX6389LT23D3+T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.31V threshold, asserting reset when VCC falls below that level and holding it for ≥140ms after recovery. Its auxiliary RESET IN pin compares an external voltage to an internal +1.27V reference, enabling independent monitoring of a second rail via resistor divider.
It features negative-going VCC transient immunity up to 35µs at 100mV overdrive, guarantees reset output validity down to VCC = 1V, and uses BiCMOS process for stable operation across -40°C to +125°C. The open-drain RESET output requires an external pullup resistor and sinks up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.31V ±2.5% over -40°C to +125°C - ensures accurate brownout detection for 2.5V/3.3V systems |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for μP initialization after power recovery |
| RESET Output Type | Open-drain active-low - requires external pullup; enables wired-OR reset bus configuration |
| RESET IN Threshold | +1.27V ±2.5% - allows user-adjustable secondary voltage monitoring via resistor divider |
| Supply Current | 3μA at VCC = 1.8V - enables ultra-low-power operation in battery-backed applications |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| VCC to RESET Delay | 35µs - fast response to supply collapse, minimizing risk of erroneous code execution |
Pinout & Package
MAX6389LT23D3+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187) with 0.65mm pitch and thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor; powers internal circuitry and sets reset threshold reference |
| 2 | RESET | Open-drain active-low reset output; must be pulled up externally; asserts low during fault or manual reset |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to +1.27V internal reference; enables dual-rail supervision |
| 4 | GND | Analog/digital ground reference; return path for all internal currents and external pullup |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC and external rail via RESET IN with ±2.5% threshold accuracy |
| Negative transient immunity | Rejects VCC glitches ≤35µs wide at 100mV overdrive, preventing spurious resets in noisy environments |
| Ultra-low quiescent current | 3μA at 1.8V enables >10-year battery life in always-on portable instruments |
| Valid reset down to 1V | Guaranteed logic-level output integrity even during severe brownout, eliminating need for external clamping |
| Factory-trimmed precision | 2.31V reset threshold with ±2.5% tolerance over full temperature range eliminates external calibration |
Applications
| Portable Medical Sensors | Dual-Rail Industrial Controllers |
|---|---|
Use Scenario: Battery-powered glucose meter with separate 1.8V sensor core and 3.3V display interface. IC Role / Device Role / Timing Role: Supervises both rails independently; asserts system-wide reset if either drops below safe operating level. Use Value: Prevents corrupted sensor readings or display artifacts during partial power loss by ensuring coordinated reset timing. | Use Scenario: PLC I/O module using 5V logic and 2.5V FPGA core, requiring independent voltage validation. IC Role / Device Role / Timing Role: Monitors 5V supply directly and 2.5V rail via RESET IN resistor divider; triggers unified reset signal. Use Value: Eliminates need for two discrete supervisors, reducing BOM count and PCB area while maintaining safety-critical reliability. |
| Low-Power IoT Edge Node | Automotive Body Control Module |
Use Scenario: NB-IoT node powered by coin cell, sleeping at 1μA and waking periodically for sensor readout. IC Role / Device Role / Timing Role: Provides fail-safe reset during cold-start and brownout; 140ms timeout ensures clean MCU boot before radio activation. Use Value: Enables deterministic wake-up sequence and prevents firmware lockup due to marginal supply during RF transmission bursts. | Use Scenario: Dashboard cluster with 12V-to-5V and 5V-to-3.3V DC/DC stages powering microcontroller and CAN transceiver. IC Role / Device Role / Timing Role: Supervises main 5V rail and 3.3V domain via RESET IN; meets AEC-Q100 requirements for automotive grade variants. Use Value: Ensures compliance with ISO 26262 ASIL-B reset timing constraints without adding external timing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS23D3+T | Same 2.31V threshold and 140ms timeout, but in 3-pin SC70 package with no RESET IN pin | Lacks auxiliary voltage monitoring capability; suitable only for single-rail systems | Select when space-constrained layout prohibits 4-pin footprint and dual-supply monitoring is unnecessary |
| TLV809K23DBZR | 2.32V threshold, 140ms timeout, open-drain output, but no RESET IN input and ±3% accuracy over -40°C to +125°C | Single-supply only; lower accuracy spec; not AEC-Q100 qualified | Choose for cost-sensitive industrial applications where dual-rail supervision and automotive qualification are not required |
Compared with MAX6389LT23D3+T, MAX6389XS23D3+T sacrifices RESET IN functionality for smaller size, while TLV809K23DBZR offers lower cost but reduced accuracy and no dual-monitoring capability-making MAX6389LT23D3+T optimal for space-limited, safety-critical dual-rail designs.
Availability
MAX6389LT23D3+T is available at Aetrix Electronics and suitable for portable medical sensors, dual-rail industrial controllers, and low-power IoT edge nodes requiring stable component supply, long-term lifecycle support, and automotive-grade reliability.
Supply support for MAX6389LT23D3+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 demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy μP reset supervision with flexible threshold, timeout, and dual-monitoring options for battery-powered and safety-critical embedded systems.
FAQ
What is the exact reset threshold voltage of MAX6389LT23D3+T and how stable is it over temperature?
The MAX6389LT23D3+T has a factory-set VCC reset threshold of 2.31V with ±2.5% accuracy over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimmed bandgap reference and comparator circuitry, ensuring reliable brownout detection without external calibration. The MAX6389LT23D3+T maintains this tolerance across all specified conditions, making it suitable for automotive and industrial environments where thermal drift must be minimized.
Does MAX6389LT23D3+T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6389LT23D3+T supports dual-voltage supervision via its dedicated RESET IN pin, which compares an external voltage to an internal +1.27V reference with ±2.5% accuracy. To monitor a second rail, connect a resistor divider between that rail and GND, with the midpoint fed to RESET IN. The MAX6389LT23D3+T asserts reset if either VCC falls below 2.31V or the voltage at RESET IN drops below +1.27V, enabling coordinated reset for multi-domain systems.
What is the function of the RESET output on MAX6389LT23D3+T and what external components are required?
The RESET output of MAX6389LT23D3+T is an open-drain active-low signal requiring an external pullup resistor to the target logic supply (e.g., 3.3V or 5V). It sinks up to 3.2mA when asserted (low) and exhibits VOL ≤ 0.4V at VCC ≥ 4.5V. No pullup is integrated internally, so a typical 10kΩ resistor is used. This configuration allows wired-OR connection with other reset sources and ensures compatibility with mixed-voltage systems, a key design feature of the MAX6389LT23D3+T.
How does the 140ms reset timeout period of MAX6389LT23D3+T benefit system reliability during power recovery?
The 140ms minimum reset timeout of MAX6389LT23D3+T ensures the microprocessor remains held in reset long enough for all internal registers, PLLs, and memory subsystems to stabilize after VCC recovers above 2.31V. This prevents premature code execution that could corrupt RAM or misconfigure peripherals. The MAX6389LT23D3+T guarantees this delay is met across -40°C to +125°C and under varying load conditions, directly supporting IEC 61508 and ISO 26262 functional safety requirements for embedded control systems.
Is MAX6389LT23D3+T qualified for automotive applications, and what packaging options support that use case?
The MAX6389LT23D3+T itself is not automotive-qualified; however, the MAX6389XS23D3/V+T variant (same electrical specs, 3-pin SC70) is AEC-Q100 qualified. The "/V" suffix denotes automotive qualification, and the "+T" indicates lead-free/RoHS compliance. For automotive body control or infotainment modules requiring dual-rail supervision, designers should specify the /V version. The MAX6389LT23D3+T remains ideal for industrial and medical applications where extended temperature range (-40°C to +125°C) and precision are critical but formal automotive certification is not required.
MAX6389LT23D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- 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:
- 6-µDFN (1.5x1)
MAX6389LT23D3+T FAQ
1.How can I place an order for MAX6389LT23D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389LT23D3+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 MAX6389LT23D3+T reliable?
The price and inventory of MAX6389LT23D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389LT23D3+T is usually 5 days.
3.What payment methods are accepted for MAX6389LT23D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389LT23D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389LT23D3+T?
MAX6389LT23D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389LT23D3+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 MAX6389LT23D3+T?
For technical support, including MAX6389LT23D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389LT23D3+T requirements.
6.How does Aetrix verify that MAX6389LT23D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6389LT23D3+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 MAX6389LT23D3+T meets industry standards.
7.What is the process for return or replacement of MAX6389LT23D3+T?
All MAX6389LT23D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389LT23D3+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 MAX6389LT23D3+T part is unused and in its original packaging.
Return procedure for MAX6389LT23D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6389LT23D3+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
