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Analog Devices Inc./Maxim Integrated MAX6385XS21D7-T
- Part No.:
- MAX6385XS21D7-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS21D7-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,411
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Product details
Overview
MAX6385XS21D7-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 2.10V reset threshold, 1200ms 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 battery-powered industrial controllers.
For engineers reviewing the MAX6385XS21D7-T datasheet, MAX6385XS21D7-T pinout, MAX6385XS21D7-T application, or MAX6385XS21D7-T equivalent, key selection criteria include its active-high push-pull reset output, 2.10V ±2.5% threshold accuracy over temperature, 1200ms minimum VCC timeout, MR debounced input with internal pullup, and 4-pin SC70 package compatibility with space-constrained embedded systems.
Technical Context
The MAX6385XS21D7-T implements a precision voltage comparator with ±2.5% threshold accuracy over –40°C to +125°C and 60ppm/°C tempco, paired with a monolithic timer that enforces a guaranteed-minimum 1200ms reset assertion after VCC recovery. Its MR input features internal 63kΩ pullup and 1µs minimum pulse width support.
This device uses BiCMOS process technology to achieve ultra-low quiescent current (3μA at +1.8V), negative-going VCC transient immunity up to 150µs at 100mV overdrive, and guaranteed logic-state validity on RESET output down to VCC = 1V - enabling reliable brownout detection in low-voltage microcontroller systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.10V ±2.5% over –40°C to +125°C - ensures accurate power-fail detection for 2.1V I/O or core rails |
| VCC Reset Timeout | 1200ms minimum - holds μP in reset long enough for full power stabilization after brownout recovery |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| MR Input Pullup | 63kΩ internal resistor - eliminates external components for momentary switch interface |
| Operating Range | +1.0V to +5.5V VCC - supports direct monitoring of 1.2V, 1.8V, 2.5V, 3.3V, and 5.0V rails |
| Reset Output Type | Active-high push-pull - drives high without external pullup, compatible with standard μP reset inputs |
| Package | 4-pin SC70 (X4+1 outline) - 1.6mm × 1.6mm footprint for ultra-compact PCB layouts |
Pinout & Package
MAX6385XS21D7-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.95mm with gull-wing leads. 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 triggers reset when below 2.10V |
| 2 | RESET | Active-high push-pull output - asserts high during fault; deasserts low after timeout; no external pullup required |
| 3 | MR | Active-low manual reset input - forces reset when pulled low; internal 63kΩ pullup to VCC enables switch-only interface |
| 4 | GND | Reference ground for all internal comparators and timers - must be low-impedance connection to system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.10V threshold | Eliminates external resistor divider; reduces BOM count and layout area for fixed-rail monitoring |
| 1200ms VCC reset timeout | Ensures μP remains held in reset until all power domains stabilize post-brownout, preventing boot corruption |
| Debounced MR input | Accepts mechanical switch inputs directly without external RC filtering or firmware debounce overhead |
| Valid RESET down to VCC = 1V | Guarantees clean reset assertion during deep brownout - critical for fail-safe shutdown in portable equipment |
| Negative-going transient immunity | Rejects sub-150µs glitches at 100mV overdrive - avoids spurious resets in electrically noisy industrial environments |
Applications
| Industrial PLC I/O Module | Battery-Powered Sensor Node |
|---|---|
Use Scenario: Monitors 3.3V I/O supply in DIN-rail mounted programmable logic controller modules exposed to 48V field transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high reset to ARM Cortex-M7 MCU during undervoltage events. Use Value: 1200ms timeout prevents premature boot before 3.3V rail settles post-transient; ±2.5% threshold ensures consistent trip point across operating temperature range. |
Use Scenario: Powers LoRaWAN endpoint with CR2032 coin cell and 1.8V ultra-low-power microcontroller. IC Role / Device Role / Timing Role: Resets microcontroller when battery voltage drops below 2.10V, extending usable runtime by avoiding erratic operation. Use Value: 3μA supply current minimizes standby drain; 2.10V threshold aligns precisely with MCU's minimum operating voltage specification. |
| Medical Infusion Pump Controller | Automotive Body Control Module |
Use Scenario: Ensures deterministic startup of safety-critical infusion pump MCU after AC/DC adapter reconnection. IC Role / Device Role / Timing Role: Generates guaranteed 1200ms reset pulse on VCC rise to synchronize clock domain initialization and EEPROM integrity checks. Use Value: Active-high push-pull output interfaces directly with MCU reset pin without level-shifting; valid down to VCC = 1V prevents metastability during slow ramp-up. |
Use Scenario: Monitors 5.0V supply to LIN transceiver and microcontroller in door module subjected to load-dump pulses. IC Role / Device Role / Timing Role: Provides reset supervision with manual override via dashboard service button connected to MR pin. Use Value: Internal MR pullup eliminates discrete resistor; 1200ms timeout accommodates slow decay of bulk capacitance after ignition cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6385XS21D4-T | Same 2.10V threshold and MR input, but 1120ms VCC reset timeout (vs. 1200ms) | Suitable where slightly shorter reset hold time is acceptable for faster system recovery | Select when timing margin allows 80ms reduction in reset assertion duration |
| TPS3808G18DBVR | 2.10V threshold, 1200ms timeout, but active-low open-drain output and no MR input | Requires external pullup resistor and cannot support manual reset functionality | Choose only if system design already uses active-low reset architecture and manual reset is unnecessary |
Compared with MAX6385XS21D7-T, the MAX6385XS21D4-T offers identical functionality with reduced timeout, while the TPS3808G18DBVR lacks MR support and requires external biasing - making MAX6385XS21D7-T uniquely suited for compact, manually resettable, active-high systems.
Availability
MAX6385XS21D7-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered sensor nodes, medical infusion pump controllers, and automotive body control modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX6385XS21D7-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, medical, and automotive applications, emphasizing low power, high reliability, and extended temperature operation.
The MAX6381–MAX6390 family delivers ultra-low-power microprocessor supervisory circuits optimized for space-constrained, battery-sensitive, and thermally harsh embedded systems requiring guaranteed reset behavior across wide voltage and temperature ranges.
FAQ
What is the exact reset threshold voltage of the MAX6385XS21D7-T?
The MAX6385XS21D7-T has a factory-set reset threshold of 2.10V, specified with ±2.5% tolerance over the full –40°C to +125°C operating temperature range. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "21" corresponds to 2.05V/2.10V/2.15V nominal). The MAX6385XS21D7-T uses this precise threshold to monitor 2.1V rails without external calibration.
Does the MAX6385XS21D7-T support manual reset functionality?
Yes, the MAX6385XS21D7-T includes a debounced manual reset input (MR pin) with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an immediate reset assertion, which remains active for the full 1200ms timeout after MR is released. This feature enables hardware-initiated resets using a simple momentary switch, and the MAX6385XS21D7-T requires no external components for basic MR implementation.
What package type and dimensions does the MAX6385XS21D7-T use?
The MAX6385XS21D7-T is packaged in a 4-pin SC70 (X4+1 outline), measuring 1.6mm × 1.6mm × 0.95mm with gull-wing leads. Its land pattern is documented as 90-0187, and it is RoHS-compliant (denoted by the "+T" suffix). This compact package enables high-density routing in space-limited applications such as wearable medical devices and compact industrial sensors, and the MAX6385XS21D7-T shares footprint compatibility with other 4-pin SC70 supervisory ICs.
How does the MAX6385XS21D7-T behave during brownout conditions?
When VCC falls below 2.10V, the MAX6385XS21D7-T asserts its active-high RESET output within 35µs and holds it asserted for a guaranteed minimum 1200ms after VCC rises above the threshold. Crucially, the MAX6385XS21D7-T guarantees correct RESET logic state down to VCC = 1V, ensuring deterministic behavior during deep brownouts where many competing supervisors fail.
Is the MAX6385XS21D7-T pin-compatible with legacy Maxim reset ICs?
Yes, the MAX6385XS21D7-T is pin-compatible with the MAX809/MAX810 series and other members of the MAX6381–MAX6390 family in the same 4-pin SC70 package. Its pinout (VCC, RESET, MR, GND) matches industry-standard configurations, allowing drop-in replacement in existing designs - provided the active-high output and 2.10V threshold meet system requirements. This compatibility simplifies migration paths for the MAX6385XS21D7-T in legacy designs.
MAX6385XS21D7-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:
- 2.1V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS21D7-T FAQ
1.How can I place an order for MAX6385XS21D7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS21D7-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 MAX6385XS21D7-T reliable?
The price and inventory of MAX6385XS21D7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS21D7-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS21D7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS21D7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS21D7-T?
MAX6385XS21D7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS21D7-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 MAX6385XS21D7-T?
For technical support, including MAX6385XS21D7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS21D7-T requirements.
6.How does Aetrix verify that MAX6385XS21D7-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS21D7-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 MAX6385XS21D7-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS21D7-T?
All MAX6385XS21D7-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS21D7-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 MAX6385XS21D7-T part is unused and in its original packaging.
Return procedure for MAX6385XS21D7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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