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Analog Devices Inc./Maxim Integrated MAX6388XS46D3+T
- Part No.:
- MAX6388XS46D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS46D3+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6388XS46D3+T from Maxim Integrated is a low-power, single-supply microprocessor supervisory circuit with active-high push-pull reset output, factory-set 4.63V 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 portable battery-powered equipment and dual-voltage systems requiring precise power-up sequencing.
For engineers reviewing the MAX6388XS46D3+T datasheet, MAX6388XS46D3+T pinout, MAX6388XS46D3+T application, or MAX6388XS46D3+T equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative options - all grounded in Maxim's official specifications for the 4-pin SC70 package variant.
Technical Context
The MAX6388XS46D3+T integrates a precision voltage comparator monitoring VCC against a fixed 4.63V threshold and a separate auxiliary comparator referenced to +1.27V at the RESET IN pin, enabling independent monitoring of a second supply rail via external resistor divider. Its internal timer enforces a guaranteed minimum 140ms reset assertion after VCC recovery or RESET IN release.
It features an active-high push-pull RESET output capable of sourcing ≥500µA at VCC ≥2.5V while maintaining VOH ≥0.8×VCC, and supports noise-immune manual reset initiation only in related variants (not this part). The device operates across -40°C to +125°C and maintains ±2.5% threshold accuracy over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V nominal (±2.5% over -40°C to +125°C) - ensures reliable detection of 5V supply brownout before system instability. |
| Reset Timeout | 140ms minimum - provides sufficient hold time for microprocessor initialization and clock stabilization. |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors and wearables. |
| Operating Voltage | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout down to 1V VCC. |
| Auxiliary Input | RESET IN comparator referenced to +1.27V - allows user-defined secondary threshold via external resistor divider (e.g., for 3.3V or 2.5V rail). |
| Output Type | Active-high push-pull - eliminates need for external pullup resistor and drives CMOS/TTL inputs directly. |
| Package | 4-pin SC70 (X4+1 outline) - 1.3mm × 1.3mm footprint ideal for space-constrained portable PCBs. |
Pinout & Package
MAX6388XS46D3+T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for high-density layouts with thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor - powers internal circuitry and triggers reset when falling below 4.63V. |
| 2 | RESET | Active-high push-pull output - asserts high during fault; deasserts low after timeout; drives loads up to 500µA. |
| 3 | GND | Ground reference for all internal comparators, timers, and output stage - must be low-impedance connection. |
| 4 | RESET IN | Auxiliary voltage monitor input - compared to +1.27V internal reference; reset asserts if voltage falls below threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail supervision | Simultaneous monitoring of VCC (4.63V) and external rail via RESET IN - enables robust power sequencing in SoC-based dual-voltage systems. |
| Low-power operation | 3μA supply current at +1.8V - extends battery life in always-on edge nodes without compromising supervision integrity. |
| Precision threshold | ±2.5% reset threshold accuracy over -40°C to +125°C - eliminates need for external calibration in automotive and industrial environments. |
| Guaranteed reset validity | RESET output remains logic-valid down to VCC = 1V - prevents spurious releases during deep undervoltage conditions. |
| Transient immunity | Immunity to short negative-going VCC glitches per JEDEC JESD82-1 - reduces false resets in electrically noisy motor-control or power-conversion boards. |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Wearable ECG patch powered by CR2032 coin cell with 3.0V analog front-end and 1.8V MCU core. IC Role / Device Role / Timing Role: Supervises both 3.0V sensor rail (via RESET IN) and 1.8V core rail (via VCC) to ensure synchronized reset during battery depletion. Use Value: 3μA quiescent current extends operational life beyond 3 years; dual-threshold detection prevents data corruption during gradual voltage sag. |
Use Scenario: BCM controlling door locks, lighting, and HVAC using mixed 5V/3.3V supplies in passenger compartment. IC Role / Device Role / Timing Role: Monitors main 5V supply (VCC = 4.63V threshold) and 3.3V I/O rail (via RESET IN divider) to enforce safe boot order. Use Value: ±2.5% threshold accuracy over -40°C to +125°C ensures reliable reset across full automotive temperature range without derating. |
| Industrial PLC I/O Modules | Smart Metering Endpoints |
|
Use Scenario: DIN-rail mounted I/O module with isolated 24V-to-5V DC/DC and 5V-to-3.3V LDO powering FPGA and ADC. IC Role / Device Role / Timing Role: Uses VCC pin for 5V rail supervision and RESET IN for 3.3V rail, asserting reset if either drops below threshold. Use Value: 140ms timeout exceeds FPGA configuration time; push-pull output directly drives FPGA PROG_B pin without pullup. |
Use Scenario: ANSI C12.22–compliant electricity meter with backup supercapacitor and dual-voltage metrology IC. IC Role / Device Role / Timing Role: Supervises main 3.3V rail (VCC) and backup 2.5V rail (via RESET IN) to initiate graceful shutdown before capacitor depletion. Use Value: Valid reset down to VCC = 1V ensures deterministic behavior during final capacitor discharge phase. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388LT46D3+T | Same electrical specs but in 6-pin μDFN (L611+1) instead of 4-pin SC70 - larger footprint, lower θJA (477°C/W vs. 322.6°C/W). | Better thermal performance in high-ambient industrial enclosures; requires different PCB land pattern and stencil. | Select when board layout allows μDFN and thermal dissipation >167mW is required at TA = +70°C. |
| TPS3808G33DBVR | TI part with 3.3V threshold (not 4.63V), 200ms timeout, open-drain output - requires external pullup; no RESET IN pin. | Lacks dual-supply monitoring capability; suited only for single-rail 3.3V systems where auxiliary supervision is unnecessary. | Choose only if redesigning for 3.3V-only architecture and accepting loss of RESET IN functionality. |
Compared with MAX6388LT46D3+T, the MAX6388XS46D3+T offers superior board-area efficiency in ultra-compact designs; versus TPS3808G33DBVR, it provides critical dual-rail supervision and higher reset threshold needed for 5V legacy interfaces - neither is pin-compatible, requiring layout revision.
Availability
MAX6388XS46D3+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O modules, and smart metering endpoints requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6388XS46D3+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 demanding industrial, automotive, and computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family was engineered specifically for microprocessor reset supervision in space- and power-constrained systems, delivering factory-trimmed thresholds, dual-supply monitoring, and guaranteed operation from -40°C to +125°C.
FAQ
What is the exact reset threshold voltage of MAX6388XS46D3+T and how stable is it over temperature?
The MAX6388XS46D3+T has a factory-set nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% across the full operating temperature range of -40°C to +125°C. This stability is achieved through laser-trimming during production and confirmed by Maxim's Electrical Characteristics table, ensuring consistent brownout detection without external calibration in automotive or industrial deployments.
Does MAX6388XS46D3+T support manual reset functionality?
No, the MAX6388XS46D3+T does not include a manual reset (MR) input. According to Maxim's Selector Guide and Pin Configurations, MR is only present on MAX6384/MAX6385/MAX6386/MAX6390 variants. The MAX6388XS46D3+T features only VCC, RESET, GND, and RESET IN pins - manual reset capability requires selecting a different part number such as MAX6385XS46D3+T.
What is the function of the RESET IN pin on MAX6388XS46D3+T and how is it used in practice?
The RESET IN pin on MAX6388XS46D3+T connects to an internal +1.27V comparator reference, enabling user-defined supervision of a second voltage rail. In practice, it is configured with an external resistor divider (e.g., R1 = 100kΩ, R2 = 49.9kΩ) to set a custom threshold like 3.3V. Reset asserts if either VCC falls below 4.63V or the divided voltage at RESET IN drops below 1.27V - essential for dual-rail SoC power sequencing.
Can MAX6388XS46D3+T operate reliably at VCC = 1.2V, and what happens to the RESET output at that level?
Yes, MAX6388XS46D3+T is guaranteed to maintain valid logic states on its RESET output down to VCC = 1.0V, per the Absolute Maximum Ratings and Detailed Description sections. At VCC = 1.2V, the active-high push-pull output continues to drive high during reset assertion and low when deasserted, with VOL ≤ 0.3V and VOH ≥ 0.8×VCC - ensuring interoperability with 1.2V logic families without level-shifting.
Is MAX6388XS46D3+T pin-compatible with older Maxim reset ICs like MAX809 or MAX6326?
No, MAX6388XS46D3+T is not pin-compatible with MAX809 or MAX6326. While the datasheet notes "pin compatible with MAX809/MAX810/.../MAX6348", that statement applies only to the 3-pin SC70 variants (e.g., MAX6381XRxxDx+T) - the MAX6388XS46D3+T uses a 4-pin SC70 package with unique pinout (VCC, RESET, GND, RESET IN), whereas MAX809 is a 3-pin device with no RESET IN function.
MAX6388XS46D3+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:
- 4.63V, 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
MAX6388XS46D3+T FAQ
1.How can I place an order for MAX6388XS46D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS46D3+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 MAX6388XS46D3+T reliable?
The price and inventory of MAX6388XS46D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS46D3+T is usually 5 days.
3.What payment methods are accepted for MAX6388XS46D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS46D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS46D3+T?
MAX6388XS46D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS46D3+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 MAX6388XS46D3+T?
For technical support, including MAX6388XS46D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS46D3+T requirements.
6.How does Aetrix verify that MAX6388XS46D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS46D3+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 MAX6388XS46D3+T meets industry standards.
7.What is the process for return or replacement of MAX6388XS46D3+T?
All MAX6388XS46D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS46D3+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 MAX6388XS46D3+T part is unused and in its original packaging.
Return procedure for MAX6388XS46D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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