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Analog Devices Inc./Maxim Integrated MAX6385XS45D4-T
- Part No.:
- MAX6385XS45D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS45D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,431
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Product details
Overview
MAX6385XS45D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 4.50V 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, guarantees valid reset output down to VCC = 1V, and operates across –40°C to +125°C for use in automotive power management and industrial controllers.
For engineers reviewing the MAX6385XS45D4-T datasheet, MAX6385XS45D4-T pinout, MAX6385XS45D4-T application, or MAX6385XS45D4-T equivalent, key selection criteria include its 4.50V ±2.5% threshold accuracy over temperature, 1120ms/140ms dual timeout configuration, SC70-4 package footprint, and compatibility with critical μP reset sequencing in battery-powered and dual-voltage systems.
Technical Context
The MAX6385XS45D4-T implements a precision voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and integrates a monostable timer for fixed 1120ms VCC reset assertion and 140ms manual reset assertion. Its internal 63kΩ MR pullup resistor enables direct connection of a momentary switch to GND without external components.
This device uses BiCMOS process technology to achieve ultra-low quiescent current (3μA at +1.8V) while maintaining robust negative-going VCC transient immunity and guaranteed logic-state validity down to VCC = 1V - enabling reliable reset generation during brownout and low-VCC startup conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.50V ±2.5% over –40°C to +125°C - ensures accurate power-fail detection for 4.5V nominal supplies |
| VCC Reset Timeout | 1120ms minimum - holds μP in reset long enough for stable power rail settling after cold start |
| Manual Reset Timeout | 140ms minimum - provides short, deterministic reset pulse for operator-triggered recovery |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage Range | +1.0V to +5.5V - supports valid reset assertion even during deep brownout or partial power loss |
| Reset Output Type | Active-high push-pull - drives high without external pullup, compatible with standard μP reset inputs |
| MR Input Pullup | 63kΩ internal - eliminates need for external resistor when using momentary switch to GND |
Pinout & Package
MAX6385XS45D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, with 0.65mm lead pitch and thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - powers internal circuitry and serves as reference for reset threshold detection |
| 2 | RESET | Active-high push-pull output - asserts 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; features internal 63kΩ pullup to VCC for switch-to-GND interface |
| 4 | GND | Analog and digital ground reference - must be connected directly to system ground plane for noise immunity and accurate threshold tracking |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.50V threshold | Eliminates external resistor divider and calibration effort for 4.5V supply monitoring |
| 1120ms/140ms dual timeout | Separates long power-up stabilization time from short user-initiated reset duration |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset state during severe brownout, avoiding undefined μP behavior |
| 3μA supply current at +1.8V | Reduces standby power in always-on applications such as smart meters and wearables |
| Negative-going VCC transient immunity | Rejects sub-10µs glitches up to 100mV below threshold - prevents spurious resets in noisy environments |
Applications
| Industrial PLC Power Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5V system rail in programmable logic controller during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to ARM Cortex-M7 MCU until 5V rail stabilizes above 4.50V for ≥1120ms. Use Value: Prevents firmware execution during unstable power, eliminating watchdog timeouts and corrupted EEPROM writes. | Use Scenario: Provides reset supervision for infotainment SoC in vehicle body control unit with dual 3.3V/5V supplies. IC Role / Device Role / Timing Role: Active-high push-pull RESET output interfaces directly with SoC's reset pin; MR input enables service-mode forced reset via diagnostic tool. Use Value: Enables field-serviceable recovery without hardware rework, while 140ms MR timeout avoids accidental long-hold resets. |
| Portable Medical Sensor Hub | Battery-Powered Smart Meter |
Use Scenario: Powers wearable ECG sensor node with single Li-ion cell (2.8V–4.2V); monitors regulated 3.3V rail. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V LDO output and asserts reset before ADC sampling becomes invalid. Use Value: 3μA quiescent current extends battery life beyond 5 years in sleep mode; 4.50V threshold ensures no false trigger from normal 3.3V rail. | Use Scenario: Supervises backup supercapacitor charging circuit during main power failure in AMI meter. IC Role / Device Role / Timing Role: Monitors 3.3V backup rail and triggers 1120ms reset hold to allow safe flash memory write completion before shutdown. Use Value: Guarantees data integrity during brownout by extending reset assertion beyond typical 500ms capacitor discharge time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS45D3-T | 140ms VCC reset timeout instead of 1120ms; same 4.50V threshold and MR functionality | Suitable for fast-recovery embedded systems where shorter reset hold is acceptable | Select when system power rails stabilize quickly and longer reset assertion risks missing boot initialization window |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.6μA ICC at 3.3V; SOT-23-5 package with enable input | Lacks manual reset input; requires external enable signal for reset control | Choose for cost-sensitive 3.3V-only designs where MR is not required and smaller footprint is prioritized |
Compared with MAX6385XS45D4-T, MAX6385XS45D3-T reduces reset hold time by 87.5% but retains identical threshold and MR capability, while TPS3808G33DBVR trades manual reset and 4.5V threshold for lower current and smaller package - making each suitable for distinct power sequencing priorities.
Availability
MAX6385XS45D4-T is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLCs, portable medical sensors, and battery-powered smart meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS45D4-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 reset supervision for microprocessors in harsh environments - optimized for reliability under wide temperature swings and transient-rich power conditions.
FAQ
What is the exact reset threshold voltage of MAX6385XS45D4-T and how tightly is it specified?
The MAX6385XS45D4-T has a factory-set nominal reset threshold of +4.50V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. At +25°C, the threshold is specified as +4.39V (min) to +4.61V (max). This tight tolerance ensures reliable detection of 4.5V supply faults without requiring external calibration or trimming components.
Does MAX6385XS45D4-T support manual reset, and what is the internal pullup value on the MR pin?
Yes, MAX6385XS45D4-T includes a debounced manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. This allows direct connection of a normally open momentary switch between MR and GND - no external components needed. The MR input accepts TTL/CMOS logic levels and remains functional down to VCC = 1.0V, ensuring reliable operator-initiated reset across the full supply range.
What are the reset timeout periods for MAX6385XS45D4-T, and how do they differ between VCC and MR events?
MAX6385XS45D4-T provides two distinct timeout periods: a 1120ms minimum reset assertion time following VCC recovery (power-up reset), and a 140ms minimum assertion time following MR release (manual reset). This dual-timing architecture ensures sufficient hold time for slow-ramping power supplies while enabling rapid, non-disruptive recovery during field service - both values are guaranteed minimums across –40°C to +125°C.
Can MAX6385XS45D4-T operate reliably at very low supply voltages, and what is the lowest valid VCC level?
Yes, MAX6385XS45D4-T guarantees correct reset output logic state down to VCC = +1.0V. Its internal circuitry remains fully functional and the RESET output maintains defined high/low states throughout this range. This capability is critical for brownout protection in battery-powered systems where supply voltage may sag below nominal levels but remain above 1.0V during fault conditions.
What package type and footprint does MAX6385XS45D4-T use, and is it RoHS-compliant?
MAX6385XS45D4-T is supplied in a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm with 0.65mm lead pitch. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant. This compact, surface-mount package supports high-density PCB layouts and is compatible with standard reflow soldering profiles up to +260°C.
MAX6385XS45D4-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:
- 4.5V
- 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
MAX6385XS45D4-T FAQ
1.How can I place an order for MAX6385XS45D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS45D4-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 MAX6385XS45D4-T reliable?
The price and inventory of MAX6385XS45D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS45D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS45D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS45D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS45D4-T?
MAX6385XS45D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS45D4-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 MAX6385XS45D4-T?
For technical support, including MAX6385XS45D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS45D4-T requirements.
6.How does Aetrix verify that MAX6385XS45D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS45D4-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 MAX6385XS45D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS45D4-T?
All MAX6385XS45D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS45D4-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 MAX6385XS45D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS45D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6385XS45D4-T Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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