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Analog Devices Inc./Maxim Integrated MAX6385XS21D4-T
- Part No.:
- MAX6385XS21D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS21D4-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,965
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Product details
Overview
MAX6385XS21D4-T from Maxim Integrated is a push-pull active-high microprocessor supervisory circuit with factory-set 2.10V 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 battery-powered industrial controllers and embedded systems requiring reliable power-on reset.
For engineers reviewing the MAX6385XS21D4-T datasheet, MAX6385XS21D4-T pinout, MAX6385XS21D4-T application, or MAX6385XS21D4-T equivalent, key selection criteria include its 2.10V ±2.5% threshold accuracy over temperature, 4-pin SC70 package footprint, active-high push-pull reset output, integrated MR pullup resistor (63kΩ), and immunity to negative-going VCC transients up to 100mV overdrive.
Technical Context
The MAX6385XS21D4-T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.10V threshold, with ±2.5% accuracy maintained from -40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed minimum 1120ms reset assertion after VCC rises above threshold.
It features a debounced active-low manual reset input (MR) with internal 63kΩ pullup to VCC, asserting reset while MR is low and holding it for 1120ms after MR release. The push-pull active-high RESET output drives high during reset and low otherwise, with VOL ≤ 0.3V at 1.2mA sink and VOH ≥ 0.8×VCC at 500µA source.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.10V ±2.5% over -40°C to +125°C - ensures accurate brownout detection across automotive/industrial temperature range |
| VCC Reset Timeout | 1120ms min - guarantees sufficient processor initialization time before release of reset signal |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable devices |
| Operating Voltage | +1.0V to +5.5V - supports valid reset assertion even during deep brownout conditions down to 1V |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to μP reset inputs |
| Manual Reset Input | MR with 63kΩ internal pullup - allows direct connection of momentary switch to GND without external components |
| Package | 4-pin SC70 (X4+1 outline) - provides compact 1.6mm × 1.6mm footprint for space-constrained PCB layouts |
Pinout & Package
MAX6385XS21D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.6mm × 1.6mm × 0.9mm with gull-wing leads. Thermal resistance θJA is 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Primary supply input and monitored voltage rail - must be decoupled with 0.1μF capacitor near pin for transient immunity |
| 2 | RESET | Active-high push-pull reset output - drives high during reset assertion; sinks current when deasserted |
| 3 | MR | Active-low manual reset input - internal 63kΩ pullup to VCC; requires <100ns glitch rejection for noise immunity |
| 4 | GND | Analog and digital ground reference - must be connected to low-impedance system ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.10V threshold | Eliminates external resistor divider and calibration, reducing BOM count and layout area |
| 1120ms VCC reset timeout | Meets extended boot-time requirements of ARM Cortex-M4/M7 and RISC-V SoCs |
| MR input with internal pullup | Enables single-switch manual reset without external resistor, saving 1 component and 1 footprint |
| Guaranteed operation down to VCC = 1V | Ensures deterministic reset behavior during gradual power ramp-down in energy-harvesting systems |
| Negative-going transient immunity | Withstands VCC glitches up to 100mV below threshold for ≤35µs, preventing spurious resets |
Applications
| Battery-Powered Data Loggers | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Long-term environmental monitoring using coin-cell power and flash memory writes. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and asserts reset during brownout to prevent corrupted firmware updates. Use Value: 3μA quiescent current extends battery life beyond 5 years; 1120ms timeout accommodates slow flash write cycles. | Use Scenario: DIN-rail mounted controller with isolated 24V DC input and 3.3V logic domain. IC Role / Device Role / Timing Role: Monitors 3.3V FPGA core supply and provides clean power-on reset sequence. Use Value: ±2.5% threshold accuracy ensures reliable operation across -40°C to +85°C ambient; push-pull output interfaces directly to Xilinx Zynq PS_SRST_B. |
| Automotive Body Control Modules | Medical Portable Diagnostic Devices |
Use Scenario: 12V-to-3.3V converted supply in door module with CAN communication. IC Role / Device Role / Timing Role: Detects undervoltage on 3.3V rail and holds microcontroller in reset until stable. Use Value: AEC-Q100 qualified variant available; 2.10V threshold matches typical MCU VDDIO trip point; SC70 package withstands reflow profiles. | Use Scenario: Handheld ultrasound probe with Li-ion battery and analog front-end ASIC. IC Role / Device Role / Timing Role: Ensures ADC and timing generator initialize synchronously after power-up. Use Value: Valid reset down to VCC = 1V prevents partial initialization during battery discharge; MR pin enables field-service reset via test button. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR21D4-T | Same 2.10V threshold and 1120ms timeout, but active-low open-drain output requiring external pullup | Suitable where system-level reset bus is shared with multiple devices and wired-OR logic is required | Select when interoperability with legacy open-drain reset networks is mandatory |
| TPS3808G12DBVR | 2.13V threshold (±0.5%), 1200ms timeout, 1.8V–6.0V operating range, and 1.6μA typical ICC at 3.3V | Offers tighter threshold tolerance and lower current, but lacks MR input and uses SOT-23-5 package | Choose for ultra-low-power designs where manual reset is unnecessary and higher accuracy is critical |
Compared with MAX6385XS21D4-T, MAX6326XR21D4-T requires an external pullup resistor and alters reset polarity, while TPS3808G12DBVR reduces supply current by ~40% but removes manual reset capability and changes package geometry-making MAX6385XS21D4-T optimal for space-constrained, MR-enabled industrial controllers needing active-high drive.
Availability
MAX6385XS21D4-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial control systems, and automotive body electronics requiring stable component supply, long-lifecycle support, and AEC-Q100–compliant variants.
Supply support for MAX6385XS21D4-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 industrial, automotive, communications, and computing markets.
The MAX6381–MAX6390 family delivers low-power, high-accuracy supervisory circuits optimized for reliable reset generation in space- and power-constrained embedded systems with demanding thermal and longevity requirements.
FAQ
What is the exact reset threshold voltage of the MAX6385XS21D4-T and how tightly is it specified?
The MAX6385XS21D4-T has a factory-set reset threshold of 2.10V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This specification means the actual threshold falls between 2.05V and 2.15V at +25°C, and between 2.05V and 2.15V across all temperatures - critical for consistent brownout detection in automotive and industrial environments where supply rails vary with load and temperature.
Does the MAX6385XS21D4-T support manual reset functionality, and what are the electrical characteristics of the MR pin?
Yes, the MAX6385XS21D4-T includes a debounced active-low manual reset input (MR) with an internal 63kΩ pullup resistor to VCC. The MR pin accepts TTL- or CMOS-compatible logic levels, requires a minimum pulse width of 1µs, rejects glitches shorter than 100ns, and asserts reset for the full 1120ms timeout after MR is released. This eliminates external components for basic manual reset implementation while maintaining noise immunity in electrically noisy environments.
What package type and dimensions does the MAX6385XS21D4-T use, and is it RoHS-compliant?
The MAX6385XS21D4-T is supplied in a lead(Pb)-free, RoHS-compliant 4-pin SC70 package (outline number 21-0098), measuring 1.6mm × 1.6mm × 0.9mm with gull-wing leads. Its land pattern (90-0187) is optimized for standard reflow soldering, and thermal resistance θJA is 322.6°C/W on a multilayer PCB - enabling high-density placement in compact portable and automotive modules without thermal derating concerns.
How does the MAX6385XS21D4-T behave when VCC drops below 1.0V, and what is its minimum functional supply voltage?
The MAX6385XS21D4-T guarantees correct reset output state down to VCC = 1.0V, meaning it continues to assert or deassert the active-high RESET signal reliably as long as supply remains ≥1.0V. Below 1.0V, the device ceases operation and RESET becomes undefined. This 1.0V lower limit supports graceful shutdown in battery-powered systems where VCC decays slowly, ensuring no spurious release of reset during final discharge phase.
Is the MAX6385XS21D4-T pin-compatible with other members of the MAX6381–MAX6390 family, and which variants share the same 4-pin SC70 footprint?
Yes, the MAX6385XS21D4-T shares identical pinout and 4-pin SC70 package with all XS-suffix variants in the MAX6381–MAX6390 family, including MAX6384XSxxDx-T and MAX6386XSxxDx-T. All use Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND. This enables drop-in replacement across threshold and timeout combinations without PCB redesign - provided the reset polarity (active-high) and MR functionality match the target application's requirements.
MAX6385XS21D4-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:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS21D4-T FAQ
1.How can I place an order for MAX6385XS21D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS21D4-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 MAX6385XS21D4-T reliable?
The price and inventory of MAX6385XS21D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS21D4-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS21D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS21D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS21D4-T?
MAX6385XS21D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS21D4-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 MAX6385XS21D4-T?
For technical support, including MAX6385XS21D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS21D4-T requirements.
6.How does Aetrix verify that MAX6385XS21D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS21D4-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 MAX6385XS21D4-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS21D4-T?
All MAX6385XS21D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS21D4-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 MAX6385XS21D4-T part is unused and in its original packaging.
Return procedure for MAX6385XS21D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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