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Analog Devices Inc./Maxim Integrated MAX6385XS42D1-T
- Part No.:
- MAX6385XS42D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS42D1-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,629
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Product details
Overview
MAX6385XS42D1-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.20V reset threshold, 1ms minimum reset timeout, and manual reset input (MR), designed for reliable power-up/power-down monitoring in low-voltage embedded systems operating from +1.8V to +5.0V supply. It consumes only 3μA at +1.8V and guarantees valid reset output down to VCC = 1V.
For engineers reviewing the MAX6385XS42D1-T datasheet, MAX6385XS42D1-T pinout, MAX6385XS42D1-T application, or MAX6385XS42D1-T equivalent, key selection criteria include its active-high push-pull reset output, 4.20V ±2.5% threshold accuracy over –40°C to +125°C, MR debounce capability, SC70-4 package footprint, and compatibility with dual-rail voltage monitoring architectures.
Technical Context
The MAX6385XS42D1-T implements a precision bandgap-based reset comparator with ±2.5% threshold accuracy across temperature, paired with a monolithic timer generating a guaranteed-minimum 1ms reset assertion period after VCC recovery. Its internal 63kΩ MR pullup resistor enables direct connection of a momentary switch to GND without external components.
Unlike open-drain variants, this device drives RESET high actively during assertion-eliminating need for external pullup-and maintains logic-level validity even as VCC drops to 1V, ensuring deterministic μP initialization in brownout conditions. It supports no auxiliary voltage monitor (RESET IN) and is not a dual-threshold device.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.20V nominal, ±2.5% over –40°C to +125°C - ensures stable reset activation across automotive/industrial temperature ranges |
| Reset Timeout | 1ms minimum - provides sufficient hold time for fast-boot microcontrollers before release |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in portable equipment |
| Output Type | Active-high push-pull - eliminates external pullup resistor, reduces BOM count and board area |
| Manual Reset Input | MR with 63kΩ internal pullup - allows direct switch-to-GND interface; no external biasing required |
| Operating Voltage | +1.0V to +5.5V - supports operation down to near-dead-battery conditions while monitoring up to 5V rails |
| VCC Validity Range | RESET state guaranteed down to VCC = 1V - prevents metastability during deep brownout |
Pinout & Package
MAX6385XS42D1-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm, optimized for space-constrained portable and industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail - powers internal circuitry and triggers reset when falling below 4.20V |
| 2 | RESET | Active-high push-pull output - drives high during reset assertion; sinks current when deasserted; no external pullup needed |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing |
| 4 | MR | Active-low manual reset input - pulled internally to VCC via 63kΩ; asserting low forces immediate reset for test/service |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.20V reset threshold | Eliminates external resistor divider; reduces component count and layout sensitivity in fixed-rail applications |
| 1ms minimum reset timeout | Meets timing requirements of modern low-latency MCUs without requiring external timing capacitors |
| 63kΩ internal MR pullup | Enables single-switch manual reset implementation - no external resistor or debounce circuit needed |
| 3μA supply current at 1.8V | Extends battery runtime in always-on IoT sensors and wearables where quiescent power dominates lifetime |
| Guaranteed operation down to VCC = 1V | Ensures clean reset signaling during severe undervoltage events, preventing corrupted firmware execution |
Applications
| Industrial PLC I/O Modules | Battery-Powered Telematics Units |
|---|---|
Use Scenario: Monitoring 3.3V I/O supply in DIN-rail mounted programmable logic controllers subject to 24V field wiring transients. IC Role / Device Role / Timing Role: Primary VCC supervisor asserting active-high RESET to ARM Cortex-M7 MCU upon undervoltage detection. Use Value: 4.20V threshold precisely matches 3.3V rail tolerance; 1ms timeout aligns with MCU boot ROM latency; MR enables field-service reset without power cycle. | Use Scenario: Power sequencing and fault recovery in LTE-connected vehicle tracking devices powered by Li-ion cells. IC Role / Device Role / Timing Role: Supervising main 3.3V system rail and coordinating cold-start reset with GPS/GNSS module enable timing. Use Value: 3μA quiescent current extends sleep-mode battery life; active-high push-pull simplifies level-shifting to 1.8V modem interface; MR supports remote firmware-triggered reset via microcontroller GPIO. |
| Medical Point-of-Care Diagnostics | Smart Energy Meters |
Use Scenario: Ensuring deterministic startup of ADC and display controller in handheld blood glucose analyzers with intermittent button-cell power. IC Role / Device Role / Timing Role: Single-rail supervisor for 1.8V core logic, providing reset pulse synchronized to battery voltage recovery after button press. Use Value: Valid RESET down to VCC = 1V prevents spurious resets during weak-battery transitions; SC70-4 footprint saves critical space on compact PCBs. | Use Scenario: Monitoring backup supercapacitor voltage (2.5V–3.0V range) in AMI meters during AC mains failure. IC Role / Device Role / Timing Role: Secondary supervisor verifying energy storage integrity before enabling real-time clock and secure bootloader. Use Value: Factory-set 4.20V threshold is re-used via resistor divider on backup rail; MR allows utility technician-initiated calibration reset without opening enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS42D2-T | 20ms minimum reset timeout vs. 1ms - longer assertion period for slower-boot processors | Suitable for legacy 8-bit MCUs with >15ms ROM initialization time | Select when system boot sequence requires extended reset hold beyond 1ms |
| MAX6382XS42D1-T | Same 4.20V threshold and 1ms timeout, but no MR input - lacks manual reset functionality | Applicable where reset is triggered solely by power conditions, not user intervention | Choose if MR is unused; saves cost and eliminates MR trace routing complexity |
Compared with MAX6385XS42D1-T, MAX6385XS42D2-T trades shorter reset duration for greater timing margin in slow-boot systems, while MAX6382XS42D1-T removes MR functionality to reduce pin count and simplify design where manual reset is unnecessary.
Availability
MAX6385XS42D1-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered telematics units, medical point-of-care diagnostics, smart energy meters, and portable instrumentation requiring stable component supply with AEC-Q100-aligned reliability.
Supply support for MAX6385XS42D1-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, communications, and computing markets, emphasizing low-power operation and high reliability.
The MAX6381–MAX6390 family delivers single/dual low-voltage μP supervisory circuits targeting space- and power-constrained embedded systems needing guaranteed reset behavior across wide temperature and supply ranges.
FAQ
What is the exact reset threshold voltage of MAX6385XS42D1-T and how stable is it over temperature?
The MAX6385XS42D1-T has a factory-set nominal reset threshold of 4.20V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This stability is achieved using a precision bandgap reference and laser-trimmed resistors, making MAX6385XS42D1-T suitable for applications where supply rail tolerances are tight and environmental conditions are harsh.
Does MAX6385XS42D1-T require an external pullup resistor on the RESET pin?
No, MAX6385XS42D1-T does not require an external pullup resistor on the RESET pin because it features an active-high push-pull output stage. The device actively drives RESET high during assertion and pulls it low when deasserted, eliminating reliance on external components and reducing board area and BOM cost compared to open-drain alternatives.
What is the function and electrical behavior of the MR pin on MAX6385XS42D1-T?
The MR pin on MAX6385XS42D1-T is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces immediate reset assertion, which remains active for the full 1ms timeout after MR is released. This enables field-service, test-mode, or software-controlled reset without additional circuitry - a key feature distinguishing MAX6385XS42D1-T from MR-less variants like MAX6382XS42D1-T.
Can MAX6385XS42D1-T monitor a second voltage rail such as a core supply or I/O supply?
No, MAX6385XS42D1-T monitors only the VCC rail and does not support auxiliary voltage monitoring. It lacks the RESET IN pin found on MAX6387/MAX6388/MAX6389 variants. For dual-rail supervision, designers must select a different member of the MAX6381–MAX6390 family - MAX6385XS42D1-T is strictly a single-supply supervisor with manual reset capability.
What package type and dimensions does MAX6385XS42D1-T use, and is it RoHS-compliant?
MAX6385XS42D1-T uses a 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm, with lead (Pb)-free/RoHS-compliant construction indicated by the "+" suffix in the ordering code. Its small footprint and thermal resistance (θJA = 322.6°C/W on multilayer board) make it ideal for dense, thermally constrained layouts in portable and industrial electronics.
MAX6385XS42D1-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.2V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS42D1-T FAQ
1.How can I place an order for MAX6385XS42D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS42D1-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 MAX6385XS42D1-T reliable?
The price and inventory of MAX6385XS42D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS42D1-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS42D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS42D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS42D1-T?
MAX6385XS42D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS42D1-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 MAX6385XS42D1-T?
For technical support, including MAX6385XS42D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS42D1-T requirements.
6.How does Aetrix verify that MAX6385XS42D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS42D1-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 MAX6385XS42D1-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS42D1-T?
All MAX6385XS42D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS42D1-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 MAX6385XS42D1-T part is unused and in its original packaging.
Return procedure for MAX6385XS42D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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