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Analog Devices Inc./Maxim Integrated MAX6389LT16D3+T
- Part No.:
- MAX6389LT16D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 6-WFDFN
- Datasheet:
-
MAX6389LT16D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 6UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6389LT16D3+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 1.58V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in embedded power management systems.
For engineers reviewing the MAX6389LT16D3+T datasheet, MAX6389LT16D3+T pinout, MAX6389LT16D3+T application, or MAX6389LT16D3+T equivalent, this device serves as a precision voltage monitor and reset generator in battery-powered instrumentation, automotive control modules, and dual-rail industrial controllers where guaranteed reset assertion down to VCC = 1V and noise-immune auxiliary threshold detection are required.
Technical Context
The MAX6389LT16D3+T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 1.58V threshold while simultaneously comparing an external voltage at RESET IN to a +1.27V internal reference. It asserts reset when either voltage falls below its respective threshold.
Its open-drain RESET output requires an external pullup resistor and guarantees valid logic state down to VCC = 1V; the internal reset timer provides a guaranteed minimum 140ms timeout after VCC or RESET IN recovers, with ±2.5% threshold accuracy across full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.58V (nominal), ±2.5% tolerance over -40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges |
| RESET Timeout Period | 140ms (minimum) - guarantees sufficient processor hold time during power recovery |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered devices |
| RESET IN Threshold | +1.27V (nominal), ±2.5% over temperature - supports accurate secondary supply monitoring via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - allows operation during deep brownout and compatibility with 1.2V/1.8V/3.3V/5V rails |
| Reset Output Type | Open-drain active-low - enables wired-OR reset bus configuration and level translation across voltage domains |
| Input Leakage (RESET IN) | ±1nA max - permits use of high-value resistors (>1MΩ) in voltage dividers without threshold error |
Pinout & Package
MAX6389LT16D3+T is housed in a 6-pin μDFN package (1.5mm × 1.5mm, 0.5mm pitch, wettable flank), RoHS-compliant and qualified per AEC-Q100 for automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator; must be low-impedance connection to system ground plane |
| 2 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets reset threshold reference point |
| 3 | N.C. | No internal connection; left unconnected on PCB; no routing or thermal pad required |
| 4 | RESET IN | Auxiliary high-impedance input for secondary voltage monitoring; compared to +1.27V internal reference |
| 5 | N.C. | No internal connection; left unconnected on PCB; no routing or thermal pad required |
| 6 | RESET | Open-drain active-low reset output; requires external pullup resistor to host voltage domain; sinks up to 3.2mA at VCC ≥ 4.5V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC (1.58V) and RESET IN (1.27V) thresholds enable robust dual-rail supervision without external comparators |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic reset signaling even during severe brownout conditions before power collapse |
| ±2.5% reset threshold accuracy over temperature | Eliminates need for calibration or margining in automotive (-40°C to +125°C) and industrial designs |
| 140ms minimum reset timeout | Meets JEDEC JESD78 reliability requirements for microprocessor initialization hold time |
| Low 3μA supply current at 1.8V | Extends battery life in portable medical sensors and IoT edge nodes operating from single-cell Li-ion or coin cells |
Applications
| Industrial PLC I/O Module | Automotive Body Control Unit (BCU) |
|---|---|
|
Use Scenario: Supervises both 3.3V logic rail and 5V sensor supply in modular I/O expansion cards subject to load-switch transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to FPGA and microcontroller upon either rail dropout. Use Value: Prevents spurious firmware execution during partial power loss; 140ms timeout ensures stable clock lock before release. |
Use Scenario: Monitors 12V-to-5V DC/DC output and 5V-to-3.3V LDO output in door module controlling window lift and mirror positioning. IC Role / Device Role / Timing Role: Primary reset generator with auxiliary RESET IN tied to LDO feedback node for early fault detection. Use Value: Enables fail-safe shutdown before MCU corruption; AEC-Q100 qualification supports automotive production deployment. |
| Battery-Powered Handheld Meter | Dual-Voltage FPGA Configuration System |
|
Use Scenario: Powers from single 3.6V Li-ion cell; monitors main rail and backup supercapacitor voltage during charge/discharge cycles. IC Role / Device Role / Timing Role: VCC-supervised reset generator with RESET IN monitoring supercap voltage via resistor divider. Use Value: Guarantees clean reset on battery undervoltage (<1.58V) and supercap depletion (<1.27V × divider ratio), extending field service life. |
Use Scenario: Configures Xilinx Spartan-7 FPGA requiring separate 1.0V core and 3.3V I/O supply sequencing and fault monitoring. IC Role / Device Role / Timing Role: Resets FPGA upon either core or I/O rail failure using VCC (1.58V) and RESET IN (1.27V) inputs. Use Value: Eliminates need for discrete comparators and timers; open-drain output interfaces directly to FPGA's multi-rail reset input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6389XS16D3+T | Same electrical specs but in 4-pin SC70 package (smaller footprint, no N.C. pins) | Limited to single-rail monitoring only - lacks RESET IN pin; no auxiliary voltage supervision capability | Select when board space is constrained and only VCC monitoring is required; not suitable for dual-voltage systems. |
| TLV809E16DBVR | 1.6V reset threshold, 140ms timeout, push-pull active-low output; no RESET IN input; 3-pin SOT-23 package | Single-threshold only; higher 1.6V threshold reduces margin for 1.8V systems; no auxiliary monitoring | Choose for cost-sensitive, space-constrained applications needing basic reset only; not drop-in due to different pin count and output type. |
Compared with MAX6389LT16D3+T, MAX6389XS16D3+T sacrifices auxiliary monitoring for smaller size, while TLV809E16DBVR trades dual-rail capability and open-drain flexibility for lower cost and simpler layout - neither offers identical functionality, making MAX6389LT16D3+T uniquely suited for dual-supply fault detection in compact automotive and industrial modules.
Availability
MAX6389LT16D3+T is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, battery-powered handheld meters, and dual-voltage FPGA configuration systems requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.
Supply support for MAX6389LT16D3+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 communications applications, emphasizing low power, high accuracy, and reliability.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy voltage supervision for microprocessor-based systems where deterministic reset behavior under brownout, transient, and dual-rail fault conditions is critical.
FAQ
What is the exact reset threshold voltage of MAX6389LT16D3+T and how stable is it over temperature?
The MAX6389LT16D3+T has a factory-set nominal VCC reset threshold of 1.58V, with guaranteed ±2.5% tolerance over the full -40°C to +125°C operating range. This stability is achieved via laser-trimmed bandgap reference and comparator design, eliminating need for external calibration in automotive and industrial environments where thermal drift must be tightly controlled.
Does MAX6389LT16D3+T support monitoring of two independent power supplies?
Yes, MAX6389LT16D3+T supports dual-supply monitoring: VCC is monitored against its fixed 1.58V threshold, while the RESET IN pin compares an external voltage to an internal +1.27V reference. Either condition triggering causes the open-drain RESET output to assert, enabling coordinated reset of systems with core and I/O rails.
What is the function of the N.C. pins on MAX6389LT16D3+T in the 6-pin μDFN package?
Pins 3 and 5 of MAX6389LT16D3+T are designated N.C. (No Connection) and are not bonded internally. They must remain unconnected on the PCB - no routing, vias, or thermal pads should be attached. These pins exist for mechanical symmetry and package compatibility across the MAX6381–MAX6390 family but carry no electrical function in this variant.
Can MAX6389LT16D3+T operate reliably when VCC drops below 1.8V?
Yes, MAX6389LT16D3+T is fully specified to operate down to VCC = 1.0V and guarantees correct RESET output logic state (valid high-impedance or asserted low) even at VCC = 1.0V. Its 3μA supply current at 1.8V and functional operation at 1.0V make it suitable for deep brownout detection in battery-depleted scenarios.
Is MAX6389LT16D3+T pin-compatible with other devices in the MAX6381–MAX6390 family?
MAX6389LT16D3+T shares the same 6-pin μDFN pinout with MAX6387LTxxDx+T and MAX6388LTxxDx+T, including identical GND, VCC, RESET IN, and RESET assignments. However, it is not pin-compatible with MAX6384–MAX6386 (which feature MR instead of RESET IN) or MAX6381–MAX6383 (which lack both MR and RESET IN).
MAX6389LT16D3+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:
- 1.58V, 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)
MAX6389LT16D3+T FAQ
1.How can I place an order for MAX6389LT16D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6389LT16D3+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 MAX6389LT16D3+T reliable?
The price and inventory of MAX6389LT16D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6389LT16D3+T is usually 5 days.
3.What payment methods are accepted for MAX6389LT16D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6389LT16D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6389LT16D3+T?
MAX6389LT16D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6389LT16D3+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 MAX6389LT16D3+T?
For technical support, including MAX6389LT16D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6389LT16D3+T requirements.
6.How does Aetrix verify that MAX6389LT16D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6389LT16D3+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 MAX6389LT16D3+T meets industry standards.
7.What is the process for return or replacement of MAX6389LT16D3+T?
All MAX6389LT16D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6389LT16D3+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 MAX6389LT16D3+T part is unused and in its original packaging.
Return procedure for MAX6389LT16D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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