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Analog Devices Inc./Maxim Integrated MAX6385XS38D4-T
- Part No.:
- MAX6385XS38D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS38D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,618
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Product details
Overview
The MAX6385XS38D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 3.80V reset threshold (±2.5% over -40°C to +125°C), 1120ms minimum VCC reset timeout, and integrated debounced manual reset input (MR). It operates from 1.0V to 5.5V supply, draws only 3μA at 1.8V, and guarantees valid reset state down to VCC = 1V - ideal for battery-powered embedded controllers and portable instrumentation.
For engineers reviewing the MAX6385XS38D4-T datasheet, MAX6385XS38D4-T pinout, MAX6385XS38D4-T application, or MAX6385XS38D4-T equivalent, key selection criteria include its 4-pin SC70 package, MR input with internal 63kΩ pullup, ±2.5% threshold accuracy across automotive temperature range, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.
Technical Context
This device implements a precision voltage comparator monitoring VCC against a trimmed bandgap reference, coupled with a digital timeout counter that asserts RESET for ≥1120ms after VCC recovers above 3.80V. The MR input feeds directly into the same reset logic path, enabling synchronized manual initiation with identical timing behavior.
Its active-high push-pull output drives high during reset assertion and low otherwise, eliminating need for external pullup resistors. Internal glitch rejection (100ns) and MR pulse width requirement (1µs minimum) ensure noise immunity in industrial environments without external debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.80V nominal, ±2.5% over -40°C to +125°C - ensures reliable brownout detection across full automotive temperature range |
| VCC Reset Timeout | 1120ms minimum - guarantees sufficient μP initialization time after power 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 direct interface with 1.2V/1.8V/3.3V/5V logic domains |
| Reset Output Type | Active-high push-pull - eliminates external pullup, reduces BOM count and board space |
| Manual Reset Input | MR with 63kΩ internal pullup - allows momentary switch connection without external components |
| Reset Assertion Validity | Down to VCC = 1V - maintains deterministic reset state during deep brownout conditions |
Pinout & Package
MAX6385XS38D4-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, suitable for 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 trigger source |
| 2 | RESET | Active-high push-pull output - drives high during reset assertion, low otherwise; sinks/source capability defined per Electrical Characteristics |
| 3 | MR | Active-low manual reset input - logic low forces reset; internal 63kΩ pullup to VCC enables NC or VCC tie-off when unused |
| 4 | GND | Analog and digital ground reference - must be connected to system ground plane for stable reset threshold and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 3.80V with ±2.5% tolerance over -40°C to +125°C - eliminates external resistor network and calibration effort |
| Debounced manual reset input | MR accepts TTL/CMOS logic levels and requires no external RC filter - simplifies front-panel reset implementation |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in electrically noisy systems |
| Low-voltage operation guarantee | Valid RESET output asserted down to VCC = 1V - ensures deterministic behavior during deep undervoltage events |
| Precision timeout timing | 1120ms minimum VCC reset timeout - meets JEDEC JESD78B requirements for microprocessor initialization hold time |
Applications
| Industrial Controller Power Monitoring | Portable Medical Instrumentation |
|---|---|
Use Scenario: Continuous monitoring of 3.3V main supply in PLC I/O modules operating in harsh factory environments with voltage sags and EMI. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M7 processor during brownout, holding for 1120ms post-recovery. Use Value: Prevents corrupted firmware execution by ensuring processor remains held until regulated 3.3V rail stabilizes beyond minimum startup margin. | Use Scenario: Battery-powered handheld glucose meter requiring guaranteed boot integrity after cold-start from depleted Li-ion cell (2.8V–4.2V range). IC Role / Device Role / Timing Role: Monitors VCC and provides MR-initiated reset via tactile button; active-high output interfaces directly with MCU reset pin. Use Value: 3μA quiescent current extends single-charge battery life >2 years; 3.80V threshold aligns with safe minimum operating voltage of analog front-end. |
| Automotive Body Control Module | Dual-Rail Embedded System |
Use Scenario: AEC-Q100 qualified supervision of 5V domain powering CAN transceivers and door-lock actuators in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Resets microcontroller upon ignition-on voltage ramp-up and detects alternator dropout events; MR supports service-mode diagnostics. Use Value: ±2.5% threshold accuracy and -40°C to +125°C operation meet automotive ASIL-B functional safety requirements without derating. | Use Scenario: Simultaneous monitoring of 1.8V core and 3.3V I/O rails in FPGA-based test equipment where independent power sequencing is critical. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V rail (MAX6385XS38D4-T); auxiliary reset input on companion MAX6388 used for 1.8V rail monitoring. Use Value: Enables coordinated reset assertion across dual domains using shared MR signal - avoids race conditions during power-up sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS38D3-T | 140ms VCC reset timeout vs. 1120ms - shorter assertion period | Suitable for fast-booting systems where minimal reset hold time is required | Select when μP initialization completes in <200ms and longer timeouts risk unnecessary system delay |
| TLV803EB38DBZR | 3.8V threshold, open-drain active-low output, no MR input, 2.7μA ICC at 1.8V | Lacks manual reset capability and push-pull drive - requires external pullup and separate reset button circuit | Choose for cost-sensitive, space-constrained applications where MR is not needed and open-drain compatibility is preferred |
Compared with MAX6385XS38D3-T and TLV803EB38DBZR, the MAX6385XS38D4-T uniquely delivers 1120ms guaranteed reset hold time with integrated MR and active-high push-pull output - reducing component count and simplifying layout in automotive and industrial control designs requiring robust manual intervention and long initialization windows.
Availability
MAX6385XS38D4-T is available at Aetrix Electronics and suitable for industrial controller power monitoring, portable medical instrumentation, automotive body control modules, and dual-rail embedded systems requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.
Supply support for MAX6385XS38D4-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, emphasizing low power, high reliability, and small form factor.
The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervisory circuits optimized for battery-operated and automotive systems where accurate voltage monitoring, long timeout periods, and integrated manual reset are essential.
FAQ
What is the exact reset threshold voltage of the MAX6385XS38D4-T and how stable is it over temperature?
The MAX6385XS38D4-T has a factory-set nominal reset threshold of 3.80V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimmed bandgap reference circuitry and low-tempco design, ensuring consistent brownout detection in automotive and industrial environments without external calibration.
Does the MAX6385XS38D4-T require an external pullup resistor on its RESET output?
No, the MAX6385XS38D4-T features an active-high push-pull RESET output, which actively drives high during reset assertion and low otherwise. Unlike open-drain variants, this eliminates the need for an external pullup resistor - reducing BOM count, saving PCB area, and improving noise immunity in high-speed digital systems.
What is the function and electrical behavior of the MR pin on the MAX6385XS38D4-T?
The MR pin on the MAX6385XS38D4-T is an active-low manual reset input with an internal 63kΩ pullup resistor to VCC. Driving MR low forces immediate reset assertion, which persists for the full 1120ms timeout after MR is released. It accepts standard TTL/CMOS logic levels and requires no external debounce components due to built-in 100ns glitch rejection.
Can the MAX6385XS38D4-T operate reliably at VCC = 1.2V, and what happens to the RESET output below that?
Yes, the MAX6385XS38D4-T guarantees valid RESET output logic states down to VCC = 1.0V. At VCC = 1.2V, RESET remains fully functional: it asserts high during brownout and deasserts low after timeout. Below 1.0V, the internal regulator and comparators cease operation, and RESET behavior is undefined - system-level design must ensure VCC does not fall below 1.0V before reset completion.
How does the MAX6385XS38D4-T handle short negative-going transients on the VCC line?
The MAX6385XS38D4-T provides inherent immunity to short negative-going VCC transients: it will not assert reset for glitches ≤35µs duration when the overdrive (VTH – VCC) is 100mV. This is achieved via internal filtering and comparator hysteresis, making it suitable for noisy power environments such as automotive 12V systems with load-dump transients or industrial motor drives.
MAX6385XS38D4-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:
- 3.8V
- 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
MAX6385XS38D4-T FAQ
1.How can I place an order for MAX6385XS38D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS38D4-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 MAX6385XS38D4-T reliable?
The price and inventory of MAX6385XS38D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS38D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS38D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS38D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS38D4-T?
MAX6385XS38D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS38D4-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 MAX6385XS38D4-T?
For technical support, including MAX6385XS38D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS38D4-T requirements.
6.How does Aetrix verify that MAX6385XS38D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS38D4-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 MAX6385XS38D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS38D4-T?
All MAX6385XS38D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS38D4-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 MAX6385XS38D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS38D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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