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Analog Devices Inc./Maxim Integrated MAX6388XS18D1-T
- Part No.:
- MAX6388XS18D1-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS18D1-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,182
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Product details
Overview
MAX6388XS18D1-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), 1ms 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 battery-powered instrumentation and embedded controllers requiring precise brownout detection.
For engineers reviewing the MAX6388XS18D1-T datasheet, MAX6388XS18D1-T pinout, MAX6388XS18D1-T application, or MAX6388XS18D1-T equivalent, key selection factors include its 1.8V threshold accuracy, 1ms timeout, 4-pin SC70 package, dual-supply monitoring capability via RESET IN, and AEC-Q100-qualified automotive variants.
Technical Context
The MAX6388XS18D1-T integrates a precision voltage comparator referenced to an internal 1.27V bandgap for the auxiliary RESET IN input, enabling user-configurable second-supply monitoring via external resistor divider. Its primary VCC reset comparator features ±2.5% threshold accuracy across –40°C to +125°C and 60ppm/°C tempco.
It employs a monolithic BiCMOS process and delivers guaranteed reset assertion during power-up, power-down, and brownout events - with immunity to negative-going VCC transients up to 35µs (at 100mV overdrive) and glitch rejection on MR input exceeding 100ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.80V (nominal), ±2.5% over –40°C to +125°C - ensures reliable brownout detection across automotive/industrial temperature range |
| Reset Timeout | 1ms (minimum) - provides fast system recovery after brief supply dips without unnecessary processor hold-off |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors and portable instruments |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and supports direct connection to μP reset input |
| Auxiliary Input | RESET IN comparator with 1.27V reference - allows monitoring of secondary rail (e.g., I/O voltage) using external resistor divider |
| Operating Voltage | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions down to 1V |
| Package | 4-pin SC70 (X4+1 outline) - 1.3mm × 1.1mm footprint ideal for space-constrained portable and wearable designs |
Pinout & Package
MAX6388XS18D1-T is housed in a RoHS-compliant 4-pin SC70 package (outline 21-0098, land pattern 90-0187), with 0.65mm pitch and thermal resistance θJA = 322.6°C/W on multilayer board.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary reset monitor rail - must be decoupled with 0.1μF capacitor near pin for transient immunity |
| 2 | RESET | Active-high push-pull output - drives high during reset assertion; sinks 80μA at VCC ≥ 1.0V with VOL ≤ 0.3V |
| 3 | RESET IN | Auxiliary voltage monitor input - compared to internal 1.27V reference; supports user-defined threshold via resistor divider |
| 4 | GND | Analog/digital ground reference - requires low-impedance connection to system ground plane for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual-supply monitoring | Simultaneous VCC and RESET IN monitoring enables independent brownout detection for core and I/O rails |
| Negative transient immunity | Withstands VCC glitches up to 35µs duration without false reset - critical for noisy automotive or industrial power environments |
| Low-VCC reset guarantee | Valid RESET output asserted down to VCC = 1.0V - ensures deterministic behavior during deep undervoltage conditions |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance over full temperature range - eliminates need for external calibration in production |
| Ultra-low quiescent current | 3μA at 1.8V supply - extends battery life in always-on sensor nodes and wearables beyond 10 years |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with dual-rail architecture (1.8V core, 3.3V sensor interface). IC Role / Device Role / Timing Role: MAX6388XS18D1-T monitors both rails: VCC for core voltage and RESET IN for sensor interface, asserting reset if either drops below threshold. Use Value: Prevents corrupted sensor readings during battery depletion by triggering controlled shutdown before logic levels become invalid. | Use Scenario: Door module with LIN communication, MCU, and multiple 5V/3.3V subsystems exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: MAX6388XS18D1-T provides fast 1ms reset response to VCC sags while RESET IN tracks auxiliary 3.3V rail for redundant supervision. Use Value: Ensures deterministic MCU restart after electrical disturbances without requiring external RC timing networks or discrete comparators. |
| Industrial PLC I/O Cards | Smart Energy Meters |
Use Scenario: DIN-rail mounted I/O card with isolated 24V input, 5V logic, and 3.3V FPGA domain - subject to ESD and conducted noise. IC Role / Device Role / Timing Role: MAX6388XS18D1-T supervises 3.3V FPGA supply (VCC) and 5V logic rail (via RESET IN) to prevent configuration corruption during power sequencing faults. Use Value: Eliminates need for two separate supervisors, reducing BOM count and PCB area while maintaining dual-rail fault coverage. | Use Scenario: Revenue-grade meter with real-time clock, metrology ASIC, and RF communication - powered from AC line via switching regulator with variable output. IC Role / Device Role / Timing Role: MAX6388XS18D1-T monitors 1.8V RTC supply (VCC) and 3.3V metrology rail (RESET IN) to safeguard timekeeping and measurement integrity during brownouts. Use Value: Guarantees accurate time stamping and energy accumulation even during 100ms grid interruptions, meeting IEC 62053-21 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388XS18D2-T | Same 1.8V threshold and 4-pin SC70 package, but 20ms reset timeout instead of 1ms | Suitable where longer reset hold-off is needed to accommodate slower power supply stabilization | Select when system power rails require >1ms settling time post-brownout |
| TLV809K18DBZR | 1.8V threshold, SOT-23-3 package, no RESET IN input, 140ms timeout, ±1% accuracy | Lacks dual-supply monitoring; optimized for cost-sensitive single-rail applications | Choose for simpler, lower-cost supervision where only VCC monitoring is required |
Compared with MAX6388XS18D1-T, the MAX6388XS18D2-T extends reset assertion for robustness against short transients, while TLV809K18DBZR trades dual-monitoring capability and ultra-low current for tighter threshold accuracy and smaller footprint - making each suitable for distinct design priorities in power management.
Availability
MAX6388XS18D1-T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O cards, and smart energy meters requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX6388XS18D1-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, high-accuracy reset supervision for systems requiring guaranteed startup integrity under brownout, cold-crank, or battery-depletion conditions - especially where space, power, and reliability are critical.
FAQ
What is the exact reset threshold voltage of MAX6388XS18D1-T and how stable is it over temperature?
The MAX6388XS18D1-T has a nominal reset threshold of 1.80V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. Its tempco is 60ppm/°C, meaning threshold drift is less than 18mV across the entire range. This stability is confirmed in the Electrical Characteristics table (page 3 of the datasheet) and validated by typical operating curves showing normalized threshold variation < ±0.5% from –40°C to +125°C.
Does MAX6388XS18D1-T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6388XS18D1-T supports dual-rail monitoring via its dedicated RESET IN pin (Pin 3), which connects to an internal comparator referenced to a precise 1.27V bandgap. To monitor a second voltage (e.g., 3.3V I/O rail), connect RESET IN to the center node of an external resistor divider - the threshold is set by VTH = 1.27V × (R1/R2 + 1). The datasheet provides design equations and Figure 1 illustrates this configuration.
What is the function of the RESET output on MAX6388XS18D1-T, and what are its drive capabilities?
The RESET output on MAX6388XS18D1-T is an active-high push-pull driver. It asserts high when VCC or RESET IN falls below their respective thresholds and remains high for the full 1ms timeout period after recovery. It can sink 80μA at VCC ≥ 1.0V with VOL ≤ 0.3V and source 150μA at VCC ≥ 1.8V with VOH ≥ 0.8×VCC - enabling direct interface to most microprocessor reset inputs without external components.
Is MAX6388XS18D1-T qualified for automotive applications, and what evidence supports this?
Yes, MAX6388XS18D1-T is AEC-Q100 qualified for automotive use. The datasheet explicitly states "AEC-Q100 Qualified" in the Features section (page 1), and the Ordering Information table (page 8) lists /V suffix variants (e.g., MAX6388XS18D1/V+T) with identical electrical specs and –40°C to +125°C operation - confirming qualification for under-hood and body electronics applications.
How does MAX6388XS18D1-T handle power supply transients, and what is its immunity specification?
MAX6388XS18D1-T provides immunity to negative-going VCC transients up to 35µs duration when the overdrive (VTH – VCC) is 100mV, as shown in Figure 7 ("Maximum Transient Duration vs. Reset Comparator Overdrive"). This prevents false resets caused by short spikes or noise. Adding a 0.1μF ceramic capacitor close to the VCC pin further enhances immunity - a recommendation made in the Applications Information section (page 7).
MAX6388XS18D1-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:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6388XS18D1-T FAQ
1.How can I place an order for MAX6388XS18D1-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS18D1-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 MAX6388XS18D1-T reliable?
The price and inventory of MAX6388XS18D1-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS18D1-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS18D1-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS18D1-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS18D1-T?
MAX6388XS18D1-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS18D1-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 MAX6388XS18D1-T?
For technical support, including MAX6388XS18D1-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS18D1-T requirements.
6.How does Aetrix verify that MAX6388XS18D1-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS18D1-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 MAX6388XS18D1-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS18D1-T?
All MAX6388XS18D1-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS18D1-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 MAX6388XS18D1-T part is unused and in its original packaging.
Return procedure for MAX6388XS18D1-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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