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Analog Devices Inc./Maxim Integrated MAX6388XS21D1-T
- Part No.:
- MAX6388XS21D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS21D1-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,906
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Product details
Overview
MAX6388XS21D1-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), 1ms 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 battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6388XS21D1-T datasheet, MAX6388XS21D1-T pinout, MAX6388XS21D1-T application, or MAX6388XS21D1-T equivalent, key selection criteria include its 2.10V reset threshold accuracy, 1ms reset timeout, 4-pin SC70 package footprint, dual-supply monitoring capability via RESET IN, and guaranteed reset validity down to VCC = 1V.
Technical Context
The MAX6388XS21D1-T integrates a precision voltage comparator for VCC monitoring against a factory-trimmed 2.10V threshold and a separate +1.27V reference comparator for the RESET IN pin, enabling independent monitoring of a second supply rail. Its internal timer ensures reset assertion for ≥1ms after VCC or RESET IN recovers above their respective thresholds.
It features an active-high push-pull RESET output capable of sourcing 150µA at VCC ≥ 1.8V while maintaining VOH ≥ 0.8×VCC, and guarantees correct logic state down to VCC = 1V. The device includes negative-going VCC transient immunity and supports manual reset via external signal on MR only in other family members-not on MAX6388.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.10V (nominal), ±2.5% over -40°C to +125°C - ensures precise brownout detection across automotive/industrial temperature range |
| Reset Timeout Period | 1ms (minimum) - provides sufficient hold time for microcontroller initialization without excessive system delay |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables |
| Operating Voltage Range | 1.0V to 5.5V - supports single-supply operation from ultra-low-voltage logic up to 5V legacy systems |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and simplifies interface to μP reset inputs |
| Auxiliary Input | RESET IN pin with +1.27V internal reference - allows user-defined second-supply threshold via resistor divider for dual-rail monitoring |
| Reset Validity Limit | Guaranteed down to VCC = 1V - ensures deterministic reset behavior during deep brownout conditions |
Pinout & Package
MAX6388XS21D1-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 electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets reset threshold reference point |
| 2 | RESET | Active-high push-pull output; drives high during reset assertion, low when deasserted; compatible with standard μP reset inputs |
| 3 | GND | Analog and digital ground reference; must be connected to system ground plane for accurate threshold sensing |
| 4 | RESET IN | High-impedance auxiliary input referenced to +1.27V; used with external resistor divider to monitor secondary supply (e.g., I/O voltage) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring capability | Simultaneous VCC and RESET IN supervision enables robust power sequencing in systems with core/I/O voltage domains |
| Factory-trimmed reset threshold | 2.10V ±2.5% over full temperature range eliminates need for external calibration or trimming components |
| Ultra-low quiescent current | 3μA at 1.8V extends battery life in always-on sensor nodes and portable medical devices |
| Guaranteed reset validity to 1V | Ensures predictable reset state during severe undervoltage events where many supervisors fail silently |
| Negative-going VCC transient immunity | Withstands short-duration supply glitches without false triggering, reducing need for additional filtering capacitance |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: A wireless temperature sensor powered by a CR2032 coin cell monitors ambient conditions and transmits data every 5 minutes. IC Role / Device Role / Timing Role: MAX6388XS21D1-T supervises the 3.0V supply rail and a 1.8V sensor interface rail, asserting reset if either drops below threshold during cold-start or battery depletion. Use Value: Its 3μA supply current and 2.10V threshold prevent premature shutdown as battery voltage decays, maximizing usable sensor lifetime. | Use Scenario: An industrial programmable logic controller uses separate 24V-to-5V and 24V-to-3.3V DC/DC converters to power its microcontroller and field I/O drivers. IC Role / Device Role / Timing Role: MAX6388XS21D1-T monitors both 5V (VCC) and 3.3V (via RESET IN divider) rails, ensuring the μP remains held in reset until both supplies stabilize post-power-up. Use Value: Dual-rail supervision prevents race conditions between processor boot and I/O driver enablement, eliminating spurious actuator activation. |
| Automotive Body Control Module | Medical Wearable ECG Monitor |
Use Scenario: A vehicle door module integrates MCU, CAN transceiver, and LED drivers, operating from a 12V battery via LDO regulators. IC Role / Device Role / Timing Role: MAX6388XS21D1-T supervises the 5V MCU supply and 3.3V CAN interface supply, asserting reset during engine cranking-induced brownouts. Use Value: Its -40°C to +125°C rating and 2.10V threshold ensure reliable reset under extreme automotive thermal and voltage stress. | Use Scenario: A chest-worn ECG patch uses a low-noise analog front-end and Bluetooth LE radio, powered by a rechargeable Li-ion cell. IC Role / Device Role / Timing Role: MAX6388XS21D1-T monitors the 3.3V analog supply and 1.8V digital supply, holding the MCU in reset until both are within spec after power-on. Use Value: 1ms reset timeout provides adequate stabilization time for precision ADC references while minimizing wake-up latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388LT21D1-T | Same electrical specs but in 6-pin μDFN package (1.5mm × 1.5mm); higher thermal resistance (θJA = 477°C/W vs. 322.6°C/W) | Better suited for thermally demanding PCB layouts with ample copper area; requires different land pattern and reflow profile | Select LT version when board layout allows larger footprint and thermal management prioritizes package robustness over size |
| TPS3808G12DBVR | TI part with 1.2V reset threshold, 20ms min timeout, open-drain output, and no RESET IN pin; 3μA typical ICC at 3.3V | Lacks dual-supply monitoring; requires external pullup; suitable only for single-rail systems with lower threshold requirement | Choose TPS3808G12DBVR only if 1.2V threshold suffices and RESET IN functionality is unnecessary |
Compared with MAX6388XS21D1-T, the LT variant offers identical supervision performance in a thermally superior but physically larger μDFN package, while the TPS3808G12DBVR provides a cost-optimized single-rail alternative lacking auxiliary monitoring-making MAX6388XS21D1-T uniquely suited for compact dual-supply applications requiring 2.10V precision and SC70 integration.
Availability
MAX6388XS21D1-T is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, automotive body control units, and medical wearable devices requiring stable component supply and long-term lifecycle support.
Supply support for MAX6388XS21D1-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 consumer applications.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems operating in harsh environments, with emphasis on dual-rail monitoring, wide temperature range, and minimal board space.
FAQ
What is the exact reset threshold voltage of MAX6388XS21D1-T and how stable is it over temperature?
The MAX6388XS21D1-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 during production and is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" with min/typ/max values of 2.05V/2.10V/2.15V at +25°C and ±2.5% drift across temperature.
Does MAX6388XS21D1-T support manual reset functionality via an MR pin?
No, MAX6388XS21D1-T does not include a manual reset (MR) input. According to the Selector Guide and Pin Configurations, MR is only present on MAX6384/MAX6385/MAX6386/MAX6390 variants. MAX6388XS21D1-T features RESET IN for auxiliary voltage monitoring but lacks MR; its reset is triggered solely by VCC or RESET IN falling below their respective thresholds.
What package type and dimensions does MAX6388XS21D1-T use, and is it RoHS-compliant?
MAX6388XS21D1-T uses a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant, as explicitly stated in the Ordering Information section and Package Information table.
Can MAX6388XS21D1-T monitor two independent power rails simultaneously?
Yes, MAX6388XS21D1-T supports dual-rail monitoring: VCC is monitored directly against its 2.10V threshold, while the RESET IN pin compares an external voltage (e.g., from a resistor divider) to an internal +1.27V reference. Reset asserts if either VCC < 2.10V or RESET IN < 1.27V, enabling supervision of core and I/O supplies in systems like FPGAs or multi-voltage MCUs.
What is the minimum reset timeout period for MAX6388XS21D1-T and how is it implemented?
The MAX6388XS21D1-T has a minimum reset timeout period of 1ms, denoted by the "D1" suffix in its part number. This is a factory-programmed, internally generated timing interval that holds the active-high RESET output asserted for ≥1ms after VCC or RESET IN rises above their thresholds, ensuring sufficient time for microcontroller internal state initialization before code execution resumes.
MAX6388XS21D1-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:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6388XS21D1-T FAQ
1.How can I place an order for MAX6388XS21D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS21D1-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 MAX6388XS21D1-T reliable?
The price and inventory of MAX6388XS21D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS21D1-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS21D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS21D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS21D1-T?
MAX6388XS21D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS21D1-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 MAX6388XS21D1-T?
For technical support, including MAX6388XS21D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS21D1-T requirements.
6.How does Aetrix verify that MAX6388XS21D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS21D1-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 MAX6388XS21D1-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS21D1-T?
All MAX6388XS21D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS21D1-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 MAX6388XS21D1-T part is unused and in its original packaging.
Return procedure for MAX6388XS21D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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