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Analog Devices Inc./Maxim Integrated MAX6385XS40D4-T
- Part No.:
- MAX6385XS40D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS40D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,434
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Product details
Overview
MAX6385XS40D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.00V reset threshold, 1120ms VCC reset timeout, and manual reset input. It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6385XS40D4-T datasheet, MAX6385XS40D4-T pinout, MAX6385XS40D4-T application, or MAX6385XS40D4-T equivalent, key selection criteria include reset threshold accuracy (±2.5% over –40°C to +125°C), MR input pullup resistance (63kΩ), open-drain vs. push-pull output compatibility, and SC70-4 package footprint constraints.
Technical Context
The MAX6385XS40D4-T implements a precision bandgap-based voltage comparator with ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed minimum 1120ms reset assertion after VCC rises above 4.00V.
It features a debounced active-low manual reset input (MR) with 63kΩ internal pullup, supporting TTL/CMOS logic drive and requiring no external debounce. The active-high push-pull RESET output drives high during fault conditions and remains asserted for the full timeout period after recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.00V (factory-set, ±2.5% over –40°C to +125°C) - ensures reliable detection of 4.0V rail collapse without false triggering. |
| VCC Reset Timeout | 1120ms (min) - holds processor in reset long enough for stable power-up of 3.3V/5V systems with slow-ramping supplies. |
| Supply Current | 3μA at +1.8V - enables use in ultra-low-power battery-backed applications with multi-year shelf life. |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct interface to µP reset inputs. |
| Manual Reset Input | MR with 63kΩ internal pullup - allows momentary switch connection to GND without external components; glitch rejection ≥100ns. |
| Operating Voltage Range | +1.0V to +5.5V - guarantees functional reset assertion even during deep brownout (down to 1V VCC). |
| Temperature Range | –40°C to +125°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
MAX6385XS40D4-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. This compact footprint supports high-density PCB layouts in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - powers internal circuitry and serves as reset threshold reference point. |
| 2 | RESET | Active-high push-pull output - drives high during reset condition; sinks 80µA at VCC ≥ 1.0V, sources 150µA at VCC ≥ 1.8V. |
| 3 | MR | Active-low manual reset input - forces reset when pulled low; internal 63kΩ pullup ensures defined state when floating. |
| 4 | GND | Ground reference for all internal comparators, timers, and output drivers - must be connected to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 4.00V threshold | Eliminates external resistor divider; reduces BOM count and layout area versus adjustable supervisors. |
| 1120ms VCC reset timeout | Meets JEDEC JESD8-12B requirements for 3.3V/5V microcontroller power-up sequencing. |
| MR input with 63kΩ pullup | Supports direct connection of normally-open tactile switch to GND - no external R/C network required. |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing processor runaway before shutdown. |
| ±2.5% threshold accuracy over temperature | Reduces design margin needed for worst-case voltage tolerance - improves system reliability at temperature extremes. |
Applications
| Portable Medical Sensors | Battery-Powered IoT Edge Nodes |
|---|---|
Use Scenario: Wearable ECG monitor powered by single Li-ion cell with dynamic voltage sag during RF transmission. IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output and asserts active-high RESET to ARM Cortex-M0+ MCU during <4.00V brownout events. Use Value: Prevents firmware corruption during transient undervoltage; 3μA quiescent current extends battery life beyond 2 years. |
Use Scenario: LoRaWAN sensor node operating on coin-cell battery with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Monitors 3.0V system rail and provides 1120ms power-on reset pulse to ensure clean boot of ESP32-WROOM-32. Use Value: Guarantees MCU initialization completes before radio initialization begins, eliminating boot-time race conditions. |
| Industrial PLC I/O Modules | Automotive Body Control Units |
Use Scenario: DIN-rail mounted controller with 24V-to-3.3V DC/DC converter subject to load-dump transients. IC Role / Device Role / Timing Role: Detects 4.00V drop on 3.3V rail caused by converter instability and holds MCU in reset until stable. Use Value: 1120ms timeout prevents premature release during converter recovery oscillation; -40°C to +125°C rating ensures field reliability. |
Use Scenario: Door module with dual-rail architecture (5V MCU core, 3.3V CAN transceiver) requiring coordinated reset timing. IC Role / Device Role / Timing Role: Provides primary reset signal to MCU while enabling synchronized reset propagation via MR-driven cascaded supervision. Use Value: Manual reset capability allows service-mode reinitialization without cycling ignition; AEC-Q100-compatible version available. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS40D4+T | Same electrical specs and SC70-4 package; differs only in RoHS compliance marking (+T suffix denotes lead-free). | No functional difference - suitable for same designs; +T version meets modern environmental regulations. | Select MAX6385XS40D4+T for new designs requiring RoHS compliance; MAX6385XS40D4-T is legacy marking variant. |
| MAX6326XR40D4+T | Pin-compatible but uses different process; reset threshold tolerance ±3.0% (vs. ±2.5%), higher ICC (7μA at +1.8V). | Limited to less demanding industrial applications where tighter threshold accuracy is not critical. | Choose MAX6326XR40D4+T only if cost sensitivity outweighs need for lowest power and highest accuracy. |
Compared with MAX6385XS40D4-T, the +T variant offers identical performance with updated environmental compliance, while MAX6326XR40D4+T trades accuracy and quiescent current for lower unit cost in non-critical applications.
Availability
MAX6385XS40D4-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT edge nodes, industrial PLC I/O modules, and automotive body control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS40D4-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, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervisory circuits optimized for battery-operated and thermally harsh environments, featuring factory-trimmed thresholds and robust transient immunity.
FAQ
What is the exact reset threshold voltage of the MAX6385XS40D4-T?
The MAX6385XS40D4-T has a factory-set reset threshold of 4.00V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This value is fixed and cannot be adjusted externally, as confirmed in the Reset Thresholds table of the datasheet (suffix "40" corresponds to nominal 4.00V).
Does the MAX6385XS40D4-T support manual reset functionality?
Yes, the MAX6385XS40D4-T includes an active-low manual reset input (MR) with a 63kΩ internal pullup resistor. Driving MR low forces an immediate reset assertion, which remains active for the full 1120ms timeout after MR is released. No external components are required for basic operation.
What package type and dimensions does the MAX6385XS40D4-T use?
The MAX6385XS40D4-T is packaged in a 4-pin SC70 (SOT-323) outline, measuring 2.0mm × 2.1mm × 0.95mm. Its land pattern is documented as number 90-0187, and it complies with RoHS standards (indicated by the "+T" suffix).
How does the MAX6385XS40D4-T behave when VCC drops below 1.0V?
The MAX6385XS40D4-T guarantees correct reset output logic state down to VCC = 1.0V, but ceases functional operation below that level. Below 1.0V, the RESET output may float or become indeterminate; for VCC = 0V operation, external pullup/pulldown resistors are required per Figure 2 in the datasheet.
Is the MAX6385XS40D4-T pin-compatible with older Maxim reset ICs like the MAX809?
Yes, the MAX6385XS40D4-T is explicitly listed as pin-compatible with MAX809/MAX810/MAX803 and other legacy supervisors. Its 4-pin SC70 footprint matches these devices, enabling drop-in replacement in existing designs without PCB revision - provided the active-high push-pull output matches the target system's reset polarity requirement.
MAX6385XS40D4-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:
- 4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS40D4-T FAQ
1.How can I place an order for MAX6385XS40D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS40D4-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 MAX6385XS40D4-T reliable?
The price and inventory of MAX6385XS40D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS40D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS40D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS40D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS40D4-T?
MAX6385XS40D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS40D4-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 MAX6385XS40D4-T?
For technical support, including MAX6385XS40D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS40D4-T requirements.
6.How does Aetrix verify that MAX6385XS40D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS40D4-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 MAX6385XS40D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS40D4-T?
All MAX6385XS40D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS40D4-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 MAX6385XS40D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS40D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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