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Analog Devices Inc./Maxim Integrated MAX6388XS18D4-T
- Part No.:
- MAX6388XS18D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS18D4-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,753
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Product details
Overview
MAX6388XS18D4-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 1.8V reset threshold (±2.5% over –40°C to +125°C), 1120ms minimum VCC reset timeout, and auxiliary RESET IN input for dual-voltage monitoring in battery-powered embedded systems.
For engineers reviewing the MAX6388XS18D4-T datasheet, MAX6388XS18D4-T pinout, MAX6388XS18D4-T application, or MAX6388XS18D4-T equivalent, key selection criteria include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy over temperature, and support for secondary voltage monitoring via RESET IN comparator referenced to 1.27V.
Technical Context
The MAX6388XS18D4-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 1.8V threshold while simultaneously accepting an external voltage at RESET IN for independent monitoring of a second supply rail. Its internal timer ensures reset assertion for ≥1120ms after VCC recovery.
RESET IN uses a high-impedance input (≤50nA leakage) compared to an internal 1.27V reference; threshold adjustment is achieved via external resistor divider. The active-high push-pull output drives high during reset and guarantees correct logic state down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.8V nominal, ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive and industrial temperature ranges |
| VCC Reset Timeout | 1120ms minimum - provides sufficient hold time for complex μP initialization sequences |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| RESET IN Reference | 1.27V ±2.5% - allows accurate user-defined secondary voltage monitoring via resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset signaling even during deep brownout conditions |
| Output Type | Active-high push-pull - eliminates need for external pullup and simplifies interface to μP reset inputs |
| Package | 4-pin SC70 (X4+1 outline) - 1.6mm × 1.6mm footprint ideal for space-constrained portable designs |
Pinout & Package
MAX6388XS18D4-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), optimized for low-profile, high-density PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor; powers internal circuitry and sets reset threshold reference point |
| 2 | RESET | Active-high push-pull output; asserts high during reset condition and remains high for full 1120ms timeout after VCC recovery |
| 3 | RESET IN | Auxiliary voltage monitor input; compared to internal 1.27V reference to enable dual-rail supervision without additional ICs |
| 4 | GND | Analog and digital ground reference; must be connected directly to system ground plane for stable reset timing |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring | Simultaneous VCC and RESET IN supervision enables single-chip monitoring of core and I/O rails in dual-voltage systems |
| Ultra-low quiescent current | 3μA at 1.8V allows integration into always-on battery-backed subsystems without compromising runtime |
| Guaranteed reset validity to 1V | Ensures deterministic μP reset behavior during deep undervoltage events where many competitors fail |
| Factory-trimmed threshold accuracy | ±2.5% over full temperature range eliminates need for external calibration in production test |
| Negative-going transient immunity | Withstands VCC glitches up to 35µs duration (at 100mV overdrive) without spurious reset assertion |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Coin-cell–powered wearable ECG sensor operating continuously for >2 years between battery replacements. IC Role / Device Role / Timing Role: Supervises both 1.8V analog front-end supply and 3.3V digital supply via RESET IN; asserts reset if either drops below threshold during cold start or battery sag. Use Value: Prevents firmware lockup during low-battery brownout while consuming only 3μA, extending usable battery life by 18 months vs. higher-current supervisors. |
Use Scenario: Low-voltage wake-up circuit in BCM that monitors 5V supply and 12V ignition rail via external divider on RESET IN. IC Role / Device Role / Timing Role: Provides AEC-Q100–qualified reset assertion with 1120ms timeout to ensure MCU completes boot sequence before CAN transceiver initialization. Use Value: Eliminates need for discrete dual-supply supervisor IC, reducing BOM count and PCB area by 32% in space-constrained under-hood modules. |
| Industrial PLC I/O Modules | Smart Energy Meters |
Use Scenario: DIN-rail mounted I/O module exposed to wide ambient temperatures (–40°C to +85°C) and noisy 24V DC field power. IC Role / Device Role / Timing Role: Monitors regulated 3.3V logic supply and unregulated 24V field bus via RESET IN; triggers reset on both overvoltage and undervoltage faults. Use Value: ±2.5% threshold accuracy over temperature prevents false resets in outdoor installations, improving field reliability by >99.98% MTBF. |
Use Scenario: Tamper-resistant meter with backup supercapacitor maintaining real-time clock and secure memory during main AC loss. IC Role / Device Role / Timing Role: Supervises 3.3V RTC supply and 1.8V secure MCU core; asserts reset if either falls below threshold during capacitor discharge. Use Value: 1120ms timeout ensures complete secure erase and shutdown sequence executes before power collapse, meeting IEC 62056-21 tamper requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388LT18D4-T | Same electrical specs but in 6-pin μDFN (L611+1) instead of 4-pin SC70; no RESET IN pin - dedicated single-supply supervision only | Lacks auxiliary voltage monitoring capability; suitable only when dual-rail supervision is unnecessary | Select when board layout requires smaller thermal resistance (θJA = 477°C/W vs. 322.6°C/W) or when RESET IN functionality is unused |
| TLV809E18DBZR | 1.8V reset threshold, 1400ms timeout, active-high push-pull, but no RESET IN input; ±1.5% threshold accuracy at +25°C (±3% over –40°C to +125°C) | No secondary voltage monitoring; lower accuracy tolerance increases risk of false reset in wide-temperature deployments | Choose for cost-sensitive consumer applications where dual-supply monitoring is not required and tighter accuracy is not critical |
Compared with MAX6388XS18D4-T, the MAX6388LT18D4-T sacrifices RESET IN functionality for improved thermal performance in larger packages, while TLV809E18DBZR offers lower cost but reduced accuracy and no auxiliary monitoring - making MAX6388XS18D4-T the only option supporting validated dual-rail supervision in a 4-pin SC70 footprint.
Availability
MAX6388XS18D4-T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O modules, and smart energy meters requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6388XS18D4-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 delivers ultra-low-power microprocessor supervision with configurable thresholds, timeouts, and dual-rail monitoring - engineered specifically for battery-powered and thermally constrained embedded systems.
FAQ
What is the exact reset threshold voltage and accuracy of MAX6388XS18D4-T?
The MAX6388XS18D4-T has a factory-set nominal reset threshold of 1.8V, with guaranteed accuracy of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification is confirmed in the Electrical Characteristics table of the official datasheet (Rev 7, 8/20), ensuring reliable brownout detection without external calibration. The MAX6388XS18D4-T maintains this accuracy across voltage and temperature variations, making it suitable for automotive and industrial applications.
Does MAX6388XS18D4-T support monitoring of a second voltage rail?
Yes, the MAX6388XS18D4-T includes a dedicated RESET IN pin that connects to an internal comparator referenced to 1.27V ±2.5%. By applying a resistor divider to RESET IN, users can configure supervision of a second voltage rail - such as a 3.3V I/O supply while VCC monitors a 1.8V core rail. This dual-monitoring capability is explicitly documented in the Pin Description and Applications Information sections of the MAX6388XS18D4-T datasheet.
What is the reset timeout period for MAX6388XS18D4-T, and is it guaranteed minimum?
The MAX6388XS18D4-T provides a guaranteed minimum VCC reset timeout period of 1120ms, as indicated by the "D4" suffix in its part number. This value is specified in the Reset Timeout Delay table and confirmed in the Electrical Characteristics section (tRP = 1120ms min). The timeout begins when VCC rises above the 1.8V threshold and ensures sufficient hold time for microprocessor initialization sequences in complex embedded systems.
What package type and footprint does MAX6388XS18D4-T use?
The MAX6388XS18D4-T is packaged in a 4-pin SC70 (SOT-323) outline with code X4+1, dimensions 1.6mm × 1.6mm × 0.95mm, and land pattern number 90-0187. This RoHS-compliant, lead-free package is explicitly listed in the Ordering Information and Package Information sections of the MAX6388XS18D4-T datasheet. Its compact size supports high-density PCB layouts in portable and space-constrained applications.
Is MAX6388XS18D4-T qualified for automotive applications?
No, the MAX6388XS18D4-T is not automotive-qualified. While it operates across –40°C to +125°C and meets AEC-Q100 requirements *within specific trim versions*, the "/V" suffix (e.g., MAX6388XS18D4/V+T) denotes automotive qualification - absent in MAX6388XS18D4-T. The standard version is intended for industrial and commercial applications. For automotive use, designers must select the /V variant and verify compliance with AEC-Q100 Grade 2 or 3 requirements per application.
MAX6388XS18D4-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:
- 1.8V, 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
MAX6388XS18D4-T FAQ
1.How can I place an order for MAX6388XS18D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS18D4-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 MAX6388XS18D4-T reliable?
The price and inventory of MAX6388XS18D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS18D4-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS18D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS18D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS18D4-T?
MAX6388XS18D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS18D4-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 MAX6388XS18D4-T?
For technical support, including MAX6388XS18D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS18D4-T requirements.
6.How does Aetrix verify that MAX6388XS18D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS18D4-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 MAX6388XS18D4-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS18D4-T?
All MAX6388XS18D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS18D4-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 MAX6388XS18D4-T part is unused and in its original packaging.
Return procedure for MAX6388XS18D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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