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Analog Devices Inc./Maxim Integrated MAX6385XS21D2-T
- Part No.:
- MAX6385XS21D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS21D2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,423
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Product details
Overview
MAX6385XS21D2-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 2.10V reset threshold, 20ms minimum reset timeout, and manual reset input (MR), designed for low-power power-supply monitoring in battery-powered embedded systems. It operates from +1.0V to +5.5V, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V.
For engineers reviewing the MAX6385XS21D2-T datasheet, MAX6385XS21D2-T pinout, MAX6385XS21D2-T application, or MAX6385XS21D2-T equivalent, key selection criteria include its active-high push-pull reset output, MR debounce capability, ±2.5% reset threshold accuracy over -40°C to +125°C, and compatibility with dual-voltage monitoring architectures requiring stable brownout detection.
Technical Context
The MAX6385XS21D2-T implements a precision voltage comparator with internal 2.10V reference and an integrated timer that asserts RESET high when VCC falls below 2.10V or MR is pulled low, holding it high for ≥20ms after recovery. Its MR input features a 63kΩ internal pullup resistor and supports TTL/CMOS logic levels.
It uses BiCMOS process technology, supports operation across -40°C to +125°C, and provides negative-going VCC transient immunity up to 35µs for 100mV overdrive - enabling robust operation in noisy power environments without external filtering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.10V (±2.5% over -40°C to +125°C) - ensures reliable brownout detection for 2.1V core supplies |
| Reset Timeout | 20ms (minimum) - meets boot-time reset hold requirements for most 8-/16-bit microcontrollers |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in always-on IoT sensor nodes |
| Operating Voltage | +1.0V to +5.5V - supports direct interface with 1.2V–5V logic domains and wide-input PMIC outputs |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup resistor; drives high-impedance μP reset inputs directly |
| MR Input Pullup | 63kΩ internal - allows momentary switch connection without external components; compatible with open-drain control signals |
| Reset Valid Down To | VCC = 1V - maintains deterministic reset state during deep brownout or partial power collapse |
Pinout & Package
MAX6385XS21D2-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 threshold reference point |
| 2 | RESET | Active-high push-pull output; drives high during fault condition and remains asserted ≥20ms after recovery |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 63kΩ resistor; initiates reset on logic-low assertion |
| 4 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold sensing |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.10V with ±2.5% tolerance over full temperature range - eliminates external resistor network and calibration effort |
| Guaranteed reset validity | Operates correctly down to VCC = 1V - ensures deterministic behavior during severe undervoltage events |
| Integrated MR debounce | No external RC required; internal 63kΩ pullup and 1µs glitch rejection enable direct switch interface |
| Negative transient immunity | Withstands ≤35µs VCC glitches at 100mV overdrive - reduces false resets in electrically noisy environments |
| Low quiescent current | 3μA at +1.8V - extends battery runtime in always-on wearable and remote sensor applications |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG patch continuously monitors heart activity using ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: MAX6385XS21D2-T supervises 2.1V LDO output powering the MCU core, asserting active-high RESET during battery sag or cold-start conditions. Use Value: Ensures clean boot sequence and prevents code corruption during intermittent battery contact or low-temperature discharge. | Use Scenario: DIN-rail mounted PLC module interfaces with 24V field sensors and executes real-time control logic. IC Role / Device Role / Timing Role: MAX6385XS21D2-T monitors 3.3V logic supply derived from isolated DC/DC converter; MR pin enables hardware-initiated firmware update reset. Use Value: Guarantees deterministic restart after watchdog timeout or operator-triggered reinitialization without PCB layout changes. |
| Automotive Body Control Units | Smart Home Hub Power Management |
Use Scenario: BCM manages door locks, lighting, and window controls using ASIL-B compliant microcontroller. IC Role / Device Role / Timing Role: MAX6385XS21D2-T (with /V automotive qualification) supervises 2.1V core rail; integrates with diagnostic CAN message handler via MR pin. Use Value: Provides AEC-Q100 qualified reset assurance and supports in-system diagnostics without adding discrete logic. | Use Scenario: Wi-Fi-connected home hub aggregates Zigbee/Z-Wave sensor data and runs Linux-based gateway software. IC Role / Device Role / Timing Role: MAX6385XS21D2-T monitors 1.8V DDR memory supply and triggers controlled reboot upon detected undervoltage. Use Value: Prevents filesystem corruption during AC adapter dropout or USB-C PD negotiation instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR21D2+T | Same 2.1V threshold and 20ms timeout, but active-low push-pull output; no MR input | Lacks manual reset functionality; requires level-shifting or redesign if active-high interface is mandatory | Select when legacy board uses active-low reset and MR is unnecessary |
| TPS3808G18DBVR | 2.1V threshold, 20ms timeout, active-high push-pull, but higher 8μA ICC at +1.8V and no MR input | Higher supply current reduces battery life; lacks MR pin for field service or test-mode reset | Choose only if TI supply chain preference overrides current consumption and MR requirements |
Compared with MAX6326XR21D2+T and TPS3808G18DBVR, the MAX6385XS21D2-T uniquely combines active-high push-pull output, integrated MR with internal pullup, and industry-leading 3μA supply current - making it optimal for new battery-powered designs requiring both reliability and serviceability.
Availability
MAX6385XS21D2-T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, automotive body control units, and smart home hub power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6385XS21D2-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, mixed-signal, and power management ICs for demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for reliable microprocessor reset in space- and energy-constrained systems operating from -40°C to +125°C.
FAQ
What is the exact reset threshold voltage of the MAX6385XS21D2-T?
The MAX6385XS21D2-T has a factory-set nominal reset threshold of 2.10V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is confirmed in the Reset Thresholds table of the official datasheet and applies specifically to the "21" suffix in the part number.
Does the MAX6385XS21D2-T support manual reset functionality?
Yes, the MAX6385XS21D2-T includes a dedicated MR (manual reset) input pin with an internal 63kΩ pullup resistor to VCC. Driving MR low forces an active-high reset assertion, which remains active for the full 20ms timeout period after MR is released - enabling hardware-triggered reboots without external components.
What package type and dimensions does the MAX6385XS21D2-T use?
The MAX6385XS21D2-T is supplied in a 4-pin SC70 package (outline number 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. Its land pattern is documented as 90-0187, and it is RoHS-compliant, indicated by the "+T" suffix in the ordering code.
Can the MAX6385XS21D2-T operate reliably at very low supply voltages?
Yes, the MAX6385XS21D2-T guarantees correct reset output behavior down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. This ensures deterministic operation during deep brownout or battery depletion scenarios where other supervisors may fail.
Is the MAX6385XS21D2-T qualified for automotive applications?
No - the MAX6385XS21D2-T carries the "+T" RoHS suffix but not the "/V" automotive qualification suffix. For AEC-Q100-compliant versions, refer to variants such as MAX6385XS21D2/V+T, which are explicitly listed in the Ordering Information section of the datasheet.
MAX6385XS21D2-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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS21D2-T FAQ
1.How can I place an order for MAX6385XS21D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS21D2-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 MAX6385XS21D2-T reliable?
The price and inventory of MAX6385XS21D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS21D2-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS21D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS21D2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS21D2-T?
MAX6385XS21D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS21D2-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 MAX6385XS21D2-T?
For technical support, including MAX6385XS21D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS21D2-T requirements.
6.How does Aetrix verify that MAX6385XS21D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS21D2-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 MAX6385XS21D2-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS21D2-T?
All MAX6385XS21D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS21D2-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 MAX6385XS21D2-T part is unused and in its original packaging.
Return procedure for MAX6385XS21D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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