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Analog Devices Inc./Maxim Integrated MAX6388XS28D4-T
- Part No.:
- MAX6388XS28D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS28D4-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,937
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Product details
Overview
MAX6388XS28D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.80V VCC reset threshold (±2.5% over -40°C to +125°C), 1120ms minimum VCC 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-critical embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6388XS28D4-T datasheet, MAX6388XS28D4-T pinout, MAX6388XS28D4-T application, or MAX6388XS28D4-T equivalent, key selection criteria include its 2.80V reset threshold accuracy, 1120ms VCC timeout, dual-supply monitoring capability via RESET IN, and 4-pin SC70 package compatibility with space-constrained industrial controllers and portable instrumentation.
Technical Context
The MAX6388XS28D4-T integrates a precision voltage comparator for VCC monitoring and a separate +1.27V reference-based comparator for the auxiliary RESET IN input, enabling independent reset assertion when either supply falls below its threshold. Its internal timer guarantees minimum 1120ms reset assertion after VCC recovery.
It features an active-high push-pull RESET output guaranteed valid down to VCC = 1.0V, and supports external resistor-divider configuration on RESET IN to set user-defined secondary thresholds. The device includes negative-going VCC transient immunity and operates across -40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.80V nominal, ±2.5% over -40°C to +125°C - ensures accurate brownout detection across automotive/industrial temperature range |
| VCC Reset Timeout | 1120ms minimum - provides sufficient hold time for μP initialization after power recovery |
| Supply Current | 3μA at +1.8V - enables multi-year battery life in always-on portable equipment |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor, simplifies interface to μP reset input |
| Auxiliary Input | RESET IN with +1.27V internal reference - allows monitoring of second supply (e.g., I/O rail) using external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 1.2V–5V logic families |
| Reset Assertion Validity | Guaranteed down to VCC = 1.0V - ensures deterministic reset state even during severe undervoltage |
Pinout & Package
MAX6388XS28D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for high-density PCB layouts in portable and automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor source - must be decoupled with 0.1μF capacitor near pin |
| 2 | RESET | Active-high push-pull reset output - drives μP reset pin directly without external components |
| 3 | GND | Ground reference for all internal comparators and output stage - requires low-impedance connection |
| 4 | RESET IN | Auxiliary voltage monitor input - accepts divided-down voltage for secondary supply monitoring (e.g., core vs. I/O rail) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring capability | Simultaneous VCC and RESET IN monitoring with independent comparators - enables robust power sequencing in dual-rail systems |
| Factory-trimmed reset threshold | 2.80V ±2.5% over full temperature range - eliminates need for external calibration in production |
| Low quiescent current | 3μA at 1.8V - reduces system standby power by >90% versus legacy reset ICs |
| Transient-immune design | Immunity to short negative-going VCC glitches - prevents spurious resets in electrically noisy environments |
| Valid reset output at low VCC | RESET logic state guaranteed down to VCC = 1.0V - ensures safe μP halt during deep undervoltage events |
Applications
| Industrial Controllers | Portable Medical Devices |
|---|---|
Use Scenario: PLC I/O modules operating from 3.3V main rail and 2.5V sensor interface rail. IC Role / Device Role / Timing Role: Monitors both rails via VCC and RESET IN inputs; asserts active-high RESET if either drops below threshold. Use Value: Prevents firmware corruption during partial power loss by holding μP in reset until both supplies stabilize for ≥1120ms. | Use Scenario: Battery-powered glucose meter with 3.0V main supply and 1.8V analog front-end. IC Role / Device Role / Timing Role: Uses VCC to monitor main supply and RESET IN (with resistor divider) to track analog rail voltage. Use Value: Ensures analog subsystem powers up fully before digital processing begins, eliminating measurement offset errors. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: 12V-to-3.3V converted supply powering MCU and CAN transceiver in door module. IC Role / Device Role / Timing Role: Supervises 3.3V rail (VCC) and monitors CAN transceiver supply (via RESET IN) to detect isolated failures. Use Value: Enables fail-safe shutdown and diagnostic flagging when only one subsystem loses power, improving functional safety compliance. | Use Scenario: Dual-supply meter with 5.0V microcontroller rail and 3.3V RTC/sensor rail. IC Role / Device Role / Timing Role: Configured with 5.0V VCC threshold and 3.3V RESET IN threshold to guard against asymmetric brownouts. Use Value: Maintains real-time clock integrity and sensor data logging continuity during grid voltage sags affecting only one rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388LT28D4-T | Same electrical specs but in 6-pin μDFN package - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Suitable for thermally demanding industrial designs where SC70 thermal limits may be exceeded | Select when board layout allows larger package and higher power dissipation margin is required |
| MAX6387XS28D4-T | Identical package and timing, but open-drain active-low RESET output - requires external pullup resistor | Used where system-level reset bus is shared among multiple devices with wired-OR topology | Choose when active-low signaling or bus arbitration is required; not drop-in compatible due to output polarity and drive type |
Compared with MAX6388XS28D4-T, the LT version offers superior thermal handling in μDFN but increases PCB area, while the MAX6387 variant provides open-drain flexibility at the cost of added external component count and incompatible reset polarity - neither is pin-compatible, requiring layout revision.
Availability
MAX6388XS28D4-T is available at Aetrix Electronics and suitable for industrial controllers, portable medical devices, automotive body electronics, smart energy meters, and dual-voltage embedded systems requiring stable component supply and AEC-Q100-aligned reliability.
Supply support for MAX6388XS28D4-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, communications, and computing markets.
The MAX6381–MAX6390 family delivers ultra-low-power, high-accuracy reset supervision for microprocessor-based systems where supply stability, dual-rail monitoring, and extended temperature operation are critical.
FAQ
What is the exact reset threshold voltage of MAX6388XS28D4-T and how stable is it over temperature?
The MAX6388XS28D4-T has a factory-set nominal reset threshold of 2.80V, with guaranteed accuracy of ±2.5% across the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimmed internal references and BiCMOS process optimization, ensuring consistent brownout detection without external calibration. The MAX6388XS28D4-T maintains this specification under all specified load and supply conditions.
Does MAX6388XS28D4-T support monitoring of two independent power supplies?
Yes, the MAX6388XS28D4-T supports dual-supply monitoring: VCC serves as the primary supply input, while the dedicated RESET IN pin functions as an auxiliary comparator input referenced to an internal +1.27V bandgap. By connecting a resistor divider to RESET IN, users can configure a second reset threshold for monitoring a different rail - e.g., a 1.8V I/O supply while VCC monitors a 3.3V core rail. The MAX6388XS28D4-T asserts reset if either supply falls below its respective threshold.
What is the function of the RESET output on MAX6388XS28D4-T and how does it interface with a microprocessor?
The RESET output of the MAX6388XS28D4-T is an active-high push-pull driver, meaning it actively drives high during normal operation and pulls low only during reset assertion. This eliminates the need for an external pullup resistor and provides direct, low-impedance connection to standard microprocessor reset inputs that expect active-high assertion. The MAX6388XS28D4-T guarantees correct logic state down to VCC = 1.0V, ensuring reliable reset behavior even during deep brownout conditions.
What are the absolute maximum ratings for MAX6388XS28D4-T, particularly regarding supply voltage and pin stress?
The MAX6388XS28D4-T has an absolute maximum VCC-to-GND rating of -0.3V to +6.0V, and its RESET output tolerates -0.3V to +6.0V in open-drain mode (not applicable here) or -0.3V to (VCC + 0.3V) in push-pull mode. Input pins MR and RESET IN (though unused on this variant) are rated to -0.3V to (VCC + 0.3V). Continuous power dissipation in the 4-pin SC70 package is limited to 245mW at +70°C, derating by 3.1mW/°C above that temperature. Exceeding these limits risks permanent damage.
How does the 1120ms reset timeout of MAX6388XS28D4-T benefit system reliability during power-up sequences?
The 1120ms minimum reset timeout of the MAX6388XS28D4-T ensures the microprocessor remains held in reset long enough for all internal clocks, PLLs, and memory subsystems to stabilize after power reaches nominal levels - especially critical in systems with slow-ramping supplies or complex power sequencing. This duration exceeds typical μP initialization requirements and accommodates worst-case voltage ramp rates, preventing premature code execution that could corrupt flash or peripherals. The MAX6388XS28D4-T's timeout is guaranteed minimum, providing deterministic timing margins.
MAX6388XS28D4-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:
- 2.8V, Adj
- 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
MAX6388XS28D4-T FAQ
1.How can I place an order for MAX6388XS28D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS28D4-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 MAX6388XS28D4-T reliable?
The price and inventory of MAX6388XS28D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS28D4-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS28D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS28D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS28D4-T?
MAX6388XS28D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS28D4-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 MAX6388XS28D4-T?
For technical support, including MAX6388XS28D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS28D4-T requirements.
6.How does Aetrix verify that MAX6388XS28D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS28D4-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 MAX6388XS28D4-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS28D4-T?
All MAX6388XS28D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS28D4-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 MAX6388XS28D4-T part is unused and in its original packaging.
Return procedure for MAX6388XS28D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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