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Analog Devices Inc./Maxim Integrated MAX6385XS21D5-T
- Part No.:
- MAX6385XS21D5-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6385XS21D5-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
MAX6385XS21D5-T from Maxim Integrated is a low-power, active-high push-pull μP supervisory circuit with factory-set 2.10V reset threshold, 280ms minimum VCC reset timeout, and debounced manual reset input (MR). It monitors +1.8V to +5.0V supply rails, consumes only 3μA at +1.8V, and guarantees valid reset output down to VCC = 1V. It is used in portable battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6385XS21D5-T datasheet, MAX6385XS21D5-T pinout, MAX6385XS21D5-T application, or MAX6385XS21D5-T equivalent, key selection criteria include its 2.10V ±2.5% threshold accuracy over –40°C to +125°C, 4-pin SC70 package, MR input with internal 63kΩ pullup, and immunity to negative-going VCC transients up to 35µs at 100mV overdrive.
Technical Context
The MAX6385XS21D5-T implements a precision bandgap-based voltage comparator monitoring VCC against a fixed 2.10V threshold, with ±2.5% accuracy across –40°C to +125°C and 60ppm/°C tempco. Its internal timer generates a guaranteed-minimum 280ms reset assertion after VCC rises above threshold.
It features an active-high push-pull RESET output that transitions high during fault conditions (VCC < 2.10V or MR low), remains asserted for 280ms post-recovery, and includes a debounced manual reset input (MR) with 1µs minimum pulse width support and 100ns glitch rejection - all operating with 3μA supply current at +1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.10V ±2.5% (–40°C to +125°C); ensures reliable detection of 2.1V rail collapse without false triggers |
| VCC Reset Timeout | 280ms min; holds processor in reset long enough for stable clock and supply settling |
| 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 (down to 1V) |
| MR Input Pullup | 63kΩ internal resistor; eliminates external components for momentary switch interface |
| Reset Output Type | Active-high push-pull; drives high during fault, requires no external pullup, sinks 80μA at VCC ≥ 1.0V |
| Temp Range | –40°C to +125°C; qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6385XS21D5-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, with 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; accepts +1.0V to +5.5V |
| 2 | RESET | Active-high push-pull output; asserts high when VCC < 2.10V or MR is low |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (63kΩ); debounced |
| 4 | GND | Ground reference for all internal comparators, timer, and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 2.10V threshold | Eliminates external resistor divider; reduces BOM count and layout area in space-constrained designs |
| 280ms guaranteed-minimum reset timeout | Ensures microcontroller completes power-up initialization before release, preventing firmware lockup |
| Debounced MR input with 1µs pulse support | Accepts mechanical switch bounce or noisy digital signals without external RC filtering |
| 3μA supply current at +1.8V | Extends battery life in always-on wearable and sensor nodes beyond 10 years (typical) |
| Valid reset output down to VCC = 1V | Maintains deterministic state during severe brownout, avoiding undefined MCU behavior |
Applications
| Portable Medical Sensors | Battery-Powered Industrial Loggers |
|---|---|
Use Scenario: Continuous ECG monitoring using coin-cell power with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 1.8V LDO output; asserts active-high RESET during startup and brownout to hold MCU in known state until rail stabilizes. Use Value: 3μA quiescent current extends 220mAh CR2032 battery life to >5 years; 280ms timeout prevents premature firmware execution before ADC reference settles. | Use Scenario: Remote temperature/humidity data logger deployed in unattended field locations. IC Role / Device Role / Timing Role: Monitors 3.3V system rail and provides manual reset via local pushbutton for field firmware recovery. Use Value: Internal 63kΩ MR pullup removes need for external resistor; 2.10V threshold matches Li-ion battery discharge knee, enabling graceful shutdown before cutoff. |
| Automotive Body Control Modules | Smart Home Hub Power Sequencing |
Use Scenario: Low-voltage subsystem (e.g., door module) powered from 5V bus with transient-rich environment. IC Role / Device Role / Timing Role: Detects dips below 2.10V on 3.3V domain; suppresses false resets from <35µs negative VCC glitches. Use Value: ±2.5% threshold accuracy over –40°C to +125°C ensures consistent behavior across engine bay temperatures; AEC-Q100–qualified variant available. | Use Scenario: Multi-rail smart speaker with separate 1.2V core, 3.3V I/O, and 5V USB supplies. IC Role / Device Role / Timing Role: Provides primary reset for 3.3V domain; MR pin enables synchronized reset across domains via logic-controlled signal. Use Value: Active-high push-pull output interfaces directly with 3.3V FPGA reset input without level-shifting; 280ms timeout aligns with slowest power rail ramp time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX809TRD3-T | 2.93V reset threshold, 240ms timeout, 3-pin SC70, no MR input | Lacks manual reset; suited for simple single-rail systems without field service requirements | Select when only basic VCC monitoring is needed and board space is constrained to 3-pin footprint |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, SOT-23-5, adjustable delay via capacitor, 1.6μA ICC | Requires external timing capacitor; lower current but fixed higher threshold limits use with sub-3V rails | Choose for ultra-low-power designs where 3.3V rail supervision suffices and capacitor tolerance is acceptable |
Compared with MAX809TRD3-T and TPS3808G33DBVR, MAX6385XS21D5-T uniquely combines 2.10V threshold, 280ms timeout, MR functionality, and 4-pin SC70 packaging - making it optimal for compact, battery-sensitive designs requiring precise low-voltage supervision and field-recoverable reset capability.
Availability
MAX6385XS21D5-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial loggers, automotive body control modules, and smart home hub power sequencing requiring stable component supply and long-lifecycle support.
Supply support for MAX6385XS21D5-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 power, sensing, and connectivity in demanding industrial, automotive, and computing applications.
The MAX6381–MAX6390 family delivers ultra-low-power, factory-trimmed supervisory circuits optimized for space- and energy-constrained embedded systems requiring accurate voltage monitoring and robust reset generation.
FAQ
What is the exact reset threshold voltage of the MAX6385XS21D5-T?
The MAX6385XS21D5-T has a factory-set reset threshold of 2.10V, specified with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet (suffix "21"), and applies to the VCC monitor path. The device does not include a RESET IN pin, so no auxiliary threshold is present.
Does the MAX6385XS21D5-T support manual reset, and how is it implemented?
Yes, the MAX6385XS21D5-T includes a debounced manual reset input (MR) on Pin 3. It is active-low, internally pulled up to VCC with a 63kΩ resistor, and accepts TTL/CMOS logic levels. A low pulse ≥1µs forces reset assertion for the full 280ms timeout period. No external components are required - a momentary switch from MR to GND suffices.
What package type and dimensions does the MAX6385XS21D5-T use?
The MAX6385XS21D5-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. It is RoHS-compliant ("+T" suffix), rated for –40°C to +125°C operation, and features θJA = 322.6°C/W on a multilayer PCB.
How does the MAX6385XS21D5-T behave during deep brownout conditions?
The MAX6385XS21D5-T guarantees correct RESET output logic state down to VCC = 1.0V. Its active-high push-pull output remains functional and valid throughout this range - asserting high during fault and deasserting cleanly upon recovery - ensuring deterministic microcontroller behavior even during severe undervoltage events.
Is the MAX6385XS21D5-T pin-compatible with other devices in the MAX638x family?
Yes, the MAX6385XS21D5-T shares identical 4-pin SC70 pinout with all MAX6384–MAX6386 and MAX6390 variants in XS-prefix packaging. Pin 1 = VCC, Pin 2 = RESET, Pin 3 = MR, Pin 4 = GND. This allows direct substitution within the same package format when reset threshold or timeout requirements change.
MAX6385XS21D5-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:
- 280ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6385XS21D5-T FAQ
1.How can I place an order for MAX6385XS21D5-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6385XS21D5-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 MAX6385XS21D5-T reliable?
The price and inventory of MAX6385XS21D5-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6385XS21D5-T is usually 5 days.
3.What payment methods are accepted for MAX6385XS21D5-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6385XS21D5-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6385XS21D5-T?
MAX6385XS21D5-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6385XS21D5-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 MAX6385XS21D5-T?
For technical support, including MAX6385XS21D5-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6385XS21D5-T requirements.
6.How does Aetrix verify that MAX6385XS21D5-T is sourced from the original manufacturer or authorized distributors?
All MAX6385XS21D5-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 MAX6385XS21D5-T meets industry standards.
7.What is the process for return or replacement of MAX6385XS21D5-T?
All MAX6385XS21D5-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6385XS21D5-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 MAX6385XS21D5-T part is unused and in its original packaging.
Return procedure for MAX6385XS21D5-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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MIC826SYMT-TR
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