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Analog Devices Inc./Maxim Integrated MAX6388XS21D2-T
- Part No.:
- MAX6388XS21D2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS21D2-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,976
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Product details
Overview
MAX6388XS21D2-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), 20ms minimum reset timeout, and auxiliary RESET IN input for dual-voltage monitoring. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, targeting power-sensitive embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6388XS21D2-T datasheet, MAX6388XS21D2-T pinout, MAX6388XS21D2-T application, or MAX6388XS21D2-T equivalent, key selection criteria include its 2.10V reset threshold accuracy, 20ms VCC reset timeout, 4-pin SC70 package, auxiliary voltage monitoring capability, and guaranteed reset validity down to VCC = 1V.
Technical Context
The MAX6388XS21D2-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.10V threshold, asserting RESET when VCC falls below this level. Its internal timer enforces a minimum 20ms reset pulse after VCC recovers above threshold.
It features a dedicated high-impedance RESET IN input referenced to an internal 1.27V comparator, enabling user-defined secondary voltage monitoring via external resistor divider. The active-high push-pull RESET output drives directly without external pullup and remains valid down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.10V (nominal), ±2.5% over -40°C to +125°C - ensures stable brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 20ms (min) - guarantees sufficient processor hold time during power recovery |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year battery life in portable equipment |
| Operating Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic domains |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and reduces BOM count |
| Auxiliary Input | RESET IN with 1.27V internal reference - allows independent monitoring of second supply (e.g., I/O or core rail) |
| Reset Validity Range | Guaranteed down to VCC = 1V - ensures deterministic reset state during full power collapse |
Pinout & Package
MAX6388XS21D2-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 PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor node; accepts 1.0V–5.5V; powers internal circuitry and reference |
| 2 | RESET | Active-high push-pull output; drives high during reset assertion; sinks/source current per spec; no external pullup needed |
| 3 | GND | Analog/digital ground reference; must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | High-impedance auxiliary input; compared to internal 1.27V reference; used with external resistor divider to set secondary reset threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring capability | Simultaneous VCC and RESET IN monitoring enables robust dual-rail power sequencing in SoC or FPGA systems |
| Factory-trimmed reset threshold | 2.10V threshold laser-trimmed at wafer test, eliminating external resistor networks and calibration overhead |
| Negative-going transient immunity | Withstands short VCC glitches (e.g., <1µs at 100mV overdrive) without false reset assertion, improving system noise resilience |
| Low-voltage operation guarantee | Valid RESET output asserted down to VCC = 1V ensures deterministic behavior during complete power collapse |
| Ultra-low quiescent current | 3μA at 1.8V enables integration into always-on subsystems without compromising battery runtime |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring main 3.3V MCU supply and 1.2V core rail in programmable logic controllers exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: Dual-voltage supervisor providing synchronized reset assertion on either rail failure, with 20ms timeout ensuring firmware initialization completes before release. Use Value: Eliminates need for two discrete supervisors; 2.10V threshold matches common I/O rail tolerances; AEC-Q100 qualified versions available for automotive-grade reliability. | Use Scenario: Power supervision in body control units where 5V microcontroller supply and 3.3V sensor interface rail require coordinated reset timing. IC Role / Device Role / Timing Role: Primary VCC monitor (2.10V threshold) plus RESET IN configured for 3.3V rail via resistor divider; asserts single RESET signal on first fault. Use Value: Reduces component count vs. dual-reset ICs; 4-pin SC70 footprint saves board area in dense automotive modules; guaranteed operation to +125°C meets under-hood requirements. |
| Portable Medical Sensors | Battery-Powered IoT Edge Nodes |
Use Scenario: Supervising 1.8V BLE SoC and 3.0V analog front-end in handheld diagnostic devices powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-current supervisor (3μA @ 1.8V) extending battery life; RESET IN monitors analog rail while VCC tracks digital domain. Use Value: Enables >5-year shelf life on CR2032; 20ms timeout prevents premature wake-up during battery voltage sag; small SC70 package fits compact enclosures. | Use Scenario: Ensuring reliable boot in LoRaWAN end-nodes using 3.3V MCU and 1.8V RF transceiver, operating intermittently on lithium-thionyl chloride cells. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting unified reset on either supply deviation; 2.10V threshold aligns with typical 1.8V LDO dropout margin. Use Value: Prevents corrupted firmware execution during cold-start or load-switching events; ultra-low ICC minimizes self-discharge during 10-year deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388XS22D2-T | 2.15V reset threshold (vs. 2.10V); otherwise identical timing, package, and features | Suitable where tighter tolerance around 2.15V rail is required; not interchangeable without validation | Select only if system VCC nominal is 2.15V ±2.5% and 2.10V threshold causes premature reset |
| MAX6388LT21D2-T | Same 2.10V threshold and 20ms timeout, but in 6-pin μDFN (1.5mm × 2.0mm) instead of 4-pin SC70 | Offers additional NC pins for layout flexibility; higher thermal resistance (θJA = 477°C/W vs. 322.6°C/W) | Choose for designs needing larger solder pads or compatibility with existing μDFN footprints |
Compared with MAX6388XS21D2-T, the XS22D2-T variant shifts threshold by 50mV for tighter alignment with specific rails, while the LT21D2-T offers identical electrical specs in a physically larger, thermally less efficient package-neither is pin-compatible nor drop-in replaceable without board revision.
Availability
MAX6388XS21D2-T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensors, and battery-powered IoT edge nodes requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified variants.
Supply support for MAX6388XS21D2-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 reset supervision with dual-voltage monitoring-engineered for reliability-critical embedded systems where power efficiency and temperature stability are non-negotiable.
FAQ
What is the exact reset threshold voltage of the MAX6388XS21D2-T and how stable is it over temperature?
The MAX6388XS21D2-T has a factory-set nominal VCC reset threshold of 2.10V, with guaranteed accuracy of ±2.5% over the full operating temperature range of -40°C to +125°C. This stability is achieved through laser trimming and BiCMOS process design, ensuring consistent brownout detection without external calibration. The MAX6388XS21D2-T maintains this specification across all production lots and environmental conditions within its rated range.
Does the MAX6388XS21D2-T support monitoring of a second voltage rail, and how is it implemented?
Yes, the MAX6388XS21D2-T includes a dedicated RESET IN terminal that compares an external voltage to an internal 1.27V reference. To monitor a second rail (e.g., 3.3V), connect a resistor divider between that rail and GND, feeding the midpoint to RESET IN. The MAX6388XS21D2-T asserts reset if either VCC drops below 2.10V or the divided RESET IN voltage falls below 1.27V-enabling coordinated dual-rail supervision with one device.
What is the function of the RESET output on the MAX6388XS21D2-T, and what drive strength does it provide?
The RESET output of the MAX6388XS21D2-T is an active-high push-pull driver, meaning it actively drives high during reset assertion and low when deasserted-no external pullup is required. At VCC ≥ 2.5V and sink current ≤ 1.2mA, VOL is guaranteed ≤ 0.3V; at VCC ≥ 4.5V and source current ≤ 800µA, VOH is ≥ 0.8 × VCC. This ensures clean, rail-to-rail signaling compatible with standard CMOS inputs across its operating voltage range.
Can the MAX6388XS21D2-T operate reliably during deep brownout conditions, and down to what VCC level does reset remain valid?
Yes, the MAX6388XS21D2-T guarantees correct RESET output logic state down to VCC = 1.0V, making it suitable for applications experiencing severe undervoltage events. Below 1.0V, internal circuitry may cease functioning, but the output remains latched in its last valid state until VCC fully collapses. This behavior ensures deterministic microprocessor reset even during catastrophic power loss-critical for data integrity in industrial and automotive systems using the MAX6388XS21D2-T.
What package type and dimensions does the MAX6388XS21D2-T use, and are there thermal limitations to consider?
The MAX6388XS21D2-T uses a 4-pin SC70 package (outline 21-0098) measuring 2.0mm × 2.1mm × 0.95mm with a thermal resistance θJA of 322.6°C/W on a multilayer board. Its maximum junction temperature is +125°C, and continuous power dissipation at TA = +70°C is 245mW (derating 3.1mW/°C above +70°C). Designers should ensure adequate copper pour and avoid placing heat sources nearby to maintain reliability-especially in sealed automotive or industrial enclosures where the MAX6388XS21D2-T operates.
MAX6388XS21D2-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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6388XS21D2-T FAQ
1.How can I place an order for MAX6388XS21D2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS21D2-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 MAX6388XS21D2-T reliable?
The price and inventory of MAX6388XS21D2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS21D2-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS21D2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS21D2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS21D2-T?
MAX6388XS21D2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS21D2-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 MAX6388XS21D2-T?
For technical support, including MAX6388XS21D2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS21D2-T requirements.
6.How does Aetrix verify that MAX6388XS21D2-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS21D2-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 MAX6388XS21D2-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS21D2-T?
All MAX6388XS21D2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS21D2-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 MAX6388XS21D2-T part is unused and in its original packaging.
Return procedure for MAX6388XS21D2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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