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Analog Devices Inc./Maxim Integrated MAX6388XS21D3-T
- Part No.:
- MAX6388XS21D3-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS21D3-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,159
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Product details
Overview
MAX6388XS21D3-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.10V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It consumes only 3μA at +1.8V and guarantees valid reset state down to VCC = 1V, used in battery-powered instrumentation and embedded controllers requiring reliable power-up/brownout detection.
For engineers reviewing the MAX6388XS21D3-T datasheet, MAX6388XS21D3-T pinout, MAX6388XS21D3-T application, or MAX6388XS21D3-T equivalent, this page delivers verified electrical parameters, SC70-4 package layout, dual-supply monitoring capability, reset timing accuracy, and automotive-grade AEC-Q100 qualified alternatives - all confirmed from Maxim's official 2020 datasheet Rev 7.
Technical Context
The MAX6388XS21D3-T integrates a precision voltage comparator monitoring VCC against a fixed 2.10V threshold and a second high-impedance comparator on RESET IN referenced to +1.27V, enabling independent monitoring of a secondary supply via external resistor divider. Its internal timer generates a guaranteed-minimum 140ms reset assertion after VCC or RESET IN recovers.
It features an active-high push-pull RESET output that drives high during fault conditions (VCC < 2.10V or RESET IN < 1.27V) and remains asserted for the full timeout period. The device operates across -40°C to +125°C with ±2.5% threshold accuracy and supports manual reset initiation only in sibling parts (MAX6384–MAX6386/MAX6390), not in MAX6388.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.10V (nominal), ±2.5% over -40°C to +125°C - ensures consistent brownout detection across industrial temperature range |
| RESET Timeout Period | 140ms (minimum) - holds processor in reset long enough for stable power rail recovery before code execution |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable instruments |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and provides strong logic-level drive |
| RESET IN Threshold | +1.27V (±2.5% over temp) - allows precise user-defined secondary supply monitoring via resistor divider |
| Operating Voltage Range | +1.0V to +5.5V - supports operation down to near-dead-battery levels while maintaining reset validity |
| Reset Assertion Delay | 35µs (VCC falling at 10mV/µs) - fast response to rapid supply collapse without false triggering on noise |
Pinout & Package
MAX6388XS21D3-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, optimized for space-constrained portable and automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary reset monitor node; powers internal circuitry and sets reference for VCC comparator |
| 2 | RESET | Active-high push-pull output; driven high during reset condition (VCC < 2.10V or RESET IN < 1.27V), low otherwise |
| 3 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | Auxiliary voltage monitor input; high-impedance node compared to +1.27V reference for dual-rail supervision |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC (2.10V threshold) and external supply via RESET IN (1.27V reference), enabling robust dual-rail systems |
| Low quiescent current | 3μA at +1.8V - extends battery life in always-on edge devices without compromising supervision reliability |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic processor reset state even during deep brownout, preventing undefined MCU behavior |
| Negative-going VCC transient immunity | Rejects sub-100ns glitches up to 200mV below threshold - eliminates spurious resets in electrically noisy environments |
| AEC-Q100 qualified option available | Automotive-grade version (suffix /V) meets stress testing requirements for under-hood and ADAS applications |
Applications
| Industrial Sensor Node | Battery-Powered Data Logger |
|---|---|
Use Scenario: Remote environmental sensor operating on CR2032 coin cell with dual rails (3.3V I/O, 1.8V core). IC Role / Device Role / Timing Role: Supervises both supplies using VCC (3.3V rail) and RESET IN (1.8V rail via divider), asserting active-high RESET until both stabilize post-power-up. Use Value: Prevents firmware crash during asymmetric rail ramp-up; 140ms timeout ensures core voltage settles before CPU initialization. |
Use Scenario: Portable meter logging temperature/humidity every 5 minutes, sleeping between readings. IC Role / Device Role / Timing Role: Monitors main 3.0V supply and asserts RESET if voltage drops below 2.10V during cold-start or battery depletion. Use Value: 3μA supply current minimizes sleep-mode drain; guaranteed reset down to VCC = 1V avoids boot failure at end-of-life battery voltage. |
| Automotive Body Control Module | Dual-Voltage Microcontroller System |
Use Scenario: Under-dash control unit powered by 12V-to-5V DC/DC, supplying 3.3V and 1.2V rails to MCU and peripherals. IC Role / Device Role / Timing Role: Uses RESET IN to monitor 1.2V core rail while VCC monitors 3.3V I/O rail; triggers reset if either falls out of spec. Use Value: AEC-Q100 qualified variant ensures reliability across -40°C to +125°C ambient; ±2.5% threshold accuracy prevents premature resets during thermal cycling. |
Use Scenario: FPGA-based controller with separate 2.5V analog and 1.0V digital supplies. IC Role / Device Role / Timing Role: Configures RESET IN to detect 1.0V rail collapse (using R1/R2 divider), while VCC monitors 2.5V rail at factory-set 2.10V threshold. Use Value: Eliminates need for two discrete supervisors; single IC reduces BOM count and PCB area while maintaining independent fault detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388XS22D3-T | Factory-set 2.20V VCC threshold (vs. 2.10V); identical pinout, timing, and RESET IN functionality | Suitable where higher trip point required to accommodate 3.3V rail tolerance or reduce false resets during ripple | Select when system nominal VCC is ≥3.0V and margin above 2.20V is needed for noise immunity |
| MAX6389XS21D3-T | Same 2.10V threshold and 140ms timeout, but open-drain active-low RESET output (requires external pullup) | Used where active-low reset signaling is mandated by host MCU or legacy board design | Choose only if target processor requires active-low reset assertion; otherwise prefer push-pull for lower component count |
Compared with MAX6388XS21D3-T, MAX6388XS22D3-T raises the reset threshold for improved noise margin on higher-voltage rails, while MAX6389XS21D3-T trades push-pull drive for open-drain flexibility at the cost of an extra resistor - neither offers pin compatibility with manual reset or different timeout variants.
Availability
MAX6388XS21D3-T is available at Aetrix Electronics and suitable for industrial sensor nodes, battery-powered data loggers, automotive body control modules, and dual-voltage microcontroller systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified variants.
Supply support for MAX6388XS21D3-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 industrial, automotive, and computing applications, emphasizing low power, high reliability, and integration.
The MAX6381–MAX6390 family was developed to provide ultra-low-power, high-accuracy voltage supervision for resource-constrained embedded systems - especially those requiring dual-rail monitoring and extended temperature operation.
FAQ
What is the exact reset threshold voltage of MAX6388XS21D3-T and how accurate is it over temperature?
The MAX6388XS21D3-T has a factory-set nominal VCC reset threshold of 2.10V, with guaranteed accuracy of ±2.5% over the full industrial temperature range (-40°C to +125°C). This specification is confirmed in the Electrical Characteristics table of Maxim's official datasheet Rev 7 (2020), ensuring reliable brownout detection without calibration.
Does MAX6388XS21D3-T include a manual reset input (MR) pin?
No, MAX6388XS21D3-T does not feature a manual reset input. According to the Selector Guide and Pin Configurations in the datasheet, MR is present only on MAX6384/MAX6385/MAX6386 and MAX6390. MAX6388 belongs to the RESET IN group (with pins VCC, RESET, GND, RESET IN) and lacks MR functionality.
What package type and dimensions does MAX6388XS21D3-T use?
MAX6388XS21D3-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This RoHS-compliant, surface-mount package is explicitly listed in the Ordering Information section for MAX6388XS_ _D_+T variants and validated in the Package Information table.
Can MAX6388XS21D3-T monitor two independent power supplies simultaneously?
Yes, MAX6388XS21D3-T supports dual-supply monitoring: VCC is monitored against its fixed 2.10V threshold, while the RESET IN pin compares an external voltage to an internal +1.27V reference. As documented in the Pin Description and Applications Information sections, users configure RESET IN with a resistor divider to set a custom secondary threshold.
What is the function and electrical behavior of the RESET output on MAX6388XS21D3-T?
The RESET output of MAX6388XS21D3-T is an active-high push-pull driver. It asserts high when VCC falls below 2.10V or RESET IN falls below +1.27V, and remains high for a minimum of 140ms after recovery. Per the Electrical Characteristics table, it sources ≥800µA at VOH ≥0.8×VCC and sinks ≥3.2mA at VOL ≤0.4V - eliminating need for external pullup resistors.
MAX6388XS21D3-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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.1V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6388XS21D3-T FAQ
1.How can I place an order for MAX6388XS21D3-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS21D3-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 MAX6388XS21D3-T reliable?
The price and inventory of MAX6388XS21D3-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS21D3-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS21D3-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS21D3-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS21D3-T?
MAX6388XS21D3-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS21D3-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 MAX6388XS21D3-T?
For technical support, including MAX6388XS21D3-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS21D3-T requirements.
6.How does Aetrix verify that MAX6388XS21D3-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS21D3-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 MAX6388XS21D3-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS21D3-T?
All MAX6388XS21D3-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS21D3-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 MAX6388XS21D3-T part is unused and in its original packaging.
Return procedure for MAX6388XS21D3-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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