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Analog Devices Inc./Maxim Integrated MAX6389LT26D3+T
- Part No.:
- MAX6389LT26D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6389LT26D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,325
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Product details
Overview
MAX6389LT26D3+T from Maxim Integrated is an open-drain active-low microprocessor supervisory circuit designed for dual-voltage system monitoring. It features a factory-set VCC reset threshold of 2.63V (±2.5% over −40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for monitoring a second voltage source. It consumes only 3μA at +1.8V and guarantees valid reset output down to VCC = 1V - used in battery-powered instrumentation and industrial controllers requiring reliable brownout detection.
For engineers reviewing the MAX6389LT26D3+T datasheet, MAX6389LT26D3+T pinout, MAX6389LT26D3+T application, or MAX6389LT26D3+T equivalent, key selection criteria include its open-drain active-low reset output, dual-supply monitoring capability via RESET IN, ±2.5% threshold accuracy over temperature, and guaranteed operation down to VCC = 1V - critical for low-power embedded systems with tight supply margins.
Technical Context
The MAX6389LT26D3+T integrates two independent reset comparators: one monitors VCC against a fixed 2.63V threshold, while the second compares the external RESET IN pin to an internal +1.27V reference. Reset asserts when either voltage falls below its respective threshold, and remains asserted for ≥140ms after recovery.
Its open-drain RESET output requires an external pullup resistor and supports sink currents up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V). The RESET IN input exhibits ≤50nA leakage and enables user-defined thresholds via resistor-divider networks - enabling flexible secondary supply monitoring without additional ICs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.63V (min 2.56V, max 2.69V) - factory-trimmed for precise brownout detection at 2.6V rail |
| Reset Timeout Period | 140ms (min) - ensures μP initialization completes before release, compatible with slow-start power supplies |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level-shifting across voltage domains |
| RESET IN Threshold | +1.27V (±2.5% over temp) - stable reference for configuring secondary supply reset via external resistor divider |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered devices |
| Operating Temp Range | −40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| VCC Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
Pinout & Package
MAX6389LT26D3+T is housed in a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. Pin 1 is RESET (open-drain active-low), Pin 2 is VCC, Pin 3 is RESET IN, and Pin 4 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Drives low to assert reset; requires external pullup; sinks up to 3.2mA; compatible with 1.8V–5.5V logic domains |
| 2 - VCC | Main supply input and primary voltage monitor | Powers device and feeds internal comparator for 2.63V threshold detection; operates from 1.0V to 5.5V |
| 3 - RESET IN | Auxiliary voltage monitor input | High-impedance (≤50nA leakage) node compared to +1.27V reference; enables custom reset thresholds via R-divider |
| 4 - GND | Analog and digital ground reference | Common return path for VCC, RESET, and RESET IN; must be low-impedance for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset monitoring | Simultaneously watches VCC (2.63V) and external RESET IN (1.27V reference) - eliminates need for second supervisor in dual-rail systems |
| ±2.5% reset threshold accuracy | Guaranteed over full −40°C to +125°C range - reduces design margin requirements vs. ±5% alternatives |
| 140ms minimum reset timeout | Ensures reliable μP boot sequence completion even with slow-ramping supplies or high-capacitance rails |
| 3μA supply current at 1.8V | Enables >10-year battery life in always-on sensor nodes powered by CR2032 cells |
| Valid reset output down to VCC = 1V | Maintains defined logic state during deep undervoltage - prevents spurious resets during power collapse |
Applications
| Industrial PLC I/O Modules | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Monitoring both 3.3V logic supply and 2.5V analog sensor rail in compact field-mounted I/O modules. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting shared reset line when either rail drops below safe operating level. Use Value: Prevents firmware corruption during partial power loss; eliminates discrete resistor-divider + comparator solution. |
Use Scenario: Long-term environmental monitoring using coin-cell power and ultra-low-quiescent μC. IC Role / Device Role / Timing Role: Primary reset generator ensuring clean boot after cold start or battery replacement. Use Value: 3μA quiescent current extends CR2032 life beyond 10 years; 140ms timeout accommodates slow LDO startup. |
| Automotive Body Control Units | Medical Portable Diagnostics |
Use Scenario: Supervising 5V MCU core supply and 3.3V CAN transceiver rail in under-dash ECUs. IC Role / Device Role / Timing Role: AEC-Q100 qualified supervisor providing fail-safe reset coordination between subsystems. Use Value: −40°C to +125°C operation meets automotive ambient requirements; open-drain output interfaces cleanly with 5V-tolerant CAN logic. |
Use Scenario: Ensuring deterministic boot in handheld glucose meters powered by single alkaline AA cell. IC Role / Device Role / Timing Role: Brownout detector maintaining reset assertion until battery voltage stabilizes above 2.63V. Use Value: Factory-trimmed 2.63V threshold matches typical AA discharge curve; 1V minimum VCC operation covers end-of-life voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS26D3+T | Same electrical specs but in 4-pin SC70 with different package code (XS vs LT); identical pinout and thermal performance | No functional difference; selected when standard SC70 footprint (not µDFN) is preferred for assembly or layout reuse | Drop-in replacement if board uses SC70 land pattern 90-0187; verify RoHS status per suffix (+T = lead-free) |
| TPS3808G33DBVR | Fixed 3.3V threshold, push-pull active-low output, 200ms timeout; higher ICC (8μA @ 3.3V) | Lacks RESET IN input; not suitable for dual-supply monitoring; better for single-rail 3.3V systems with tighter timing budgets | Choose when only VCC supervision is needed and push-pull drive simplifies BOM; avoid if auxiliary voltage monitoring is required |
Compared with MAX6389LT26D3+T, MAX6389XS26D3+T offers identical functionality in a functionally equivalent SC70 package, while TPS3808G33DBVR trades dual-monitoring capability for higher drive strength and simpler interface - making it viable only in single-supply designs where RESET IN is unused.
Availability
MAX6389LT26D3+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered data loggers, automotive body control units, and medical portable diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6389LT26D3+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 low power, high reliability, and AEC-Q100 qualification.
The MAX6381–MAX6390 family delivers ultra-low-power, dual-supply microprocessor supervisors targeting space-constrained, battery-operated, and harsh-environment systems requiring guaranteed reset behavior across wide voltage and temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX6389LT26D3+T?
The MAX6389LT26D3+T has a factory-set VCC reset threshold of 2.63V, with guaranteed limits of 2.56V (min) and 2.69V (max) over the full −40°C to +125°C temperature range. This value is trimmed during production and specified in the Reset Thresholds table of the datasheet; it applies exclusively to the "26" suffix variant of the MAX6389LT26D3+T.
Does the MAX6389LT26D3+T support monitoring a second voltage rail?
Yes, the MAX6389LT26D3+T includes a dedicated RESET IN pin that compares an external voltage to an internal +1.27V reference. When the voltage at RESET IN falls below this threshold, the device asserts reset - enabling dual-rail supervision without external components. This feature is confirmed in the Pin Description and Selector Guide sections for MAX6387/MAX6388/MAX6389 variants.
What is the reset timeout duration for the MAX6389LT26D3+T?
The MAX6389LT26D3+T provides a minimum reset timeout period of 140ms, denoted by the "D3" suffix in the part number. This value is guaranteed across temperature and supply voltage, and is distinct from manual reset timeout (not applicable to MAX6389, which lacks MR input).
What package type and footprint does the MAX6389LT26D3+T use?
The MAX6389LT26D3+T is supplied in a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), with dimensions of 2.0mm × 2.1mm × 0.95mm. Pin 1 is RESET, Pin 2 is VCC, Pin 3 is RESET IN, and Pin 4 is GND - matching the top-view diagram in the Pin Configurations section of the datasheet.
Is the MAX6389LT26D3+T qualified for automotive applications?
The MAX6389LT26D3+T is not explicitly marked with the /V automotive qualification suffix in its ordering code, and the datasheet lists /V versions only for specific variants (e.g., MAX6389XS30D2/V+T). Therefore, MAX6389LT26D3+T is rated for industrial temperature range (−40°C to +125°C) but is not AEC-Q100 certified unless ordered with /V suffix - confirm qualification status via official Maxim/Analog Devices documentation before automotive deployment.
MAX6389LT26D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-WFDFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, 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)
MAX6389LT26D3+T FAQ
1.How can I place an order for MAX6389LT26D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389LT26D3+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 MAX6389LT26D3+T reliable?
The price and inventory of MAX6389LT26D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389LT26D3+T is usually 5 days.
3.What payment methods are accepted for MAX6389LT26D3+T?
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4.How is shipping managed for MAX6389LT26D3+T?
MAX6389LT26D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389LT26D3+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 MAX6389LT26D3+T?
For technical support, including MAX6389LT26D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389LT26D3+T requirements.
6.How does Aetrix verify that MAX6389LT26D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6389LT26D3+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 MAX6389LT26D3+T meets industry standards.
7.What is the process for return or replacement of MAX6389LT26D3+T?
All MAX6389LT26D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389LT26D3+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 MAX6389LT26D3+T part is unused and in its original packaging.
Return procedure for MAX6389LT26D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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