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Analog Devices Inc./Maxim Integrated MAX6388XS19D4-T
- Part No.:
- MAX6388XS19D4-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS19D4-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
MAX6388XS19D4-T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisory circuit with active-high push-pull reset output, 1.90V factory-set VCC reset threshold (±2.5% over –40°C to +125°C), 1120ms minimum VCC reset timeout, and auxiliary RESET IN input for monitoring a second voltage rail. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, enabling reliable power-up/brownout detection in space-constrained battery-powered systems.
For engineers reviewing the MAX6388XS19D4-T datasheet, MAX6388XS19D4-T pinout, MAX6388XS19D4-T application, or MAX6388XS19D4-T equivalent, key selection criteria include its dual-monitoring capability (VCC + RESET IN), guaranteed reset validity down to VCC = 1V, ±2.5% threshold accuracy across automotive temperature range, and compatibility with 4-pin SC70 layout constraints.
Technical Context
The MAX6388XS19D4-T integrates two independent voltage comparators: one monitors VCC against a precision 1.90V internal reference, while the second compares an external voltage applied to RESET IN against a fixed 1.27V internal reference. Reset asserts if either monitored voltage falls below its respective threshold.
It features a digital timeout timer that holds the active-high RESET output asserted for ≥1120ms after VCC or RESET IN recovers above threshold, and supports manual reset assertion via MR input - though MR is not present on MAX6388 (only on MAX6384/85/86/90). The device guarantees correct logic state of RESET output down to VCC = 1V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.90V (nominal), ±2.5% tolerance over –40°C to +125°C - ensures accurate brownout detection across full automotive temperature range |
| RESET Timeout Period | 1120ms (min) - provides sufficient hold time to guarantee μP initialization before release |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Operating Voltage Range | 1.0V to 5.5V - supports direct interface with core/logic rails from ultra-low-voltage MCUs to 5V industrial controllers |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and drives high-impedance loads directly |
| RESET IN Threshold | 1.27V (nominal), ±2.5% over temperature - allows precise secondary rail monitoring using external resistor divider |
| Reset Assertion Validity | Guaranteed down to VCC = 1V - ensures deterministic reset behavior during deep brownout conditions |
Pinout & Package
MAX6388XS19D4-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. This compact footprint supports high-density PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail - powers internal circuitry and triggers reset when falling below 1.90V |
| 2 | RESET | Active-high push-pull reset output - drives high during fault condition; deasserts after 1120ms recovery delay |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for stable comparator operation |
| 4 | RESET IN | Auxiliary voltage monitor input - compared to 1.27V reference; enables dual-rail supervision without external comparators |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC and external rail via RESET IN - eliminates need for second supervisor IC in dual-supply systems |
| Factory-trimmed 1.90V threshold | ±2.5% accuracy over –40°C to +125°C - reduces calibration overhead and improves system-level reliability margin |
| 1120ms minimum reset timeout | Ensures μP completes power stabilization and internal reset sequence before releasing control bus |
| 1.27V precision auxiliary reference | Enables user-defined reset thresholds from ~1.3V to >5V using standard resistor dividers - no trimming required |
| Ultra-low 3μA supply current at 1.8V | Extends battery life in always-on monitoring applications such as telematics wake-up circuits and sensor nodes |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
|
Use Scenario: Monitoring both 3.3V logic supply and 5V sensor excitation rail in distributed I/O nodes. IC Role / Device Role / Timing Role: Dual-rail supervisor asserting active-high RESET to ARM Cortex-M7 MCU until both supplies stabilize post-power-up. Use Value: Prevents spurious register writes during asymmetric rail ramp-up by holding reset until both VCC and RESET IN exceed thresholds. |
Use Scenario: Supervising 1.8V microcontroller core voltage and 3.3V CAN transceiver supply in door module ECUs. IC Role / Device Role / Timing Role: Provides synchronized reset release with 1120ms timeout to ensure CAN PHY initialization completes before firmware execution. Use Value: Eliminates need for discrete RC timing network and second supervisor, reducing BOM count and layout area. |
| Portable Medical Sensors | Dual-Voltage Wearable Devices |
|
Use Scenario: Battery-powered ECG patch requiring reliable startup under weak battery conditions (down to 1.9V). IC Role / Device Role / Timing Role: Monitors declining battery voltage (VCC) and analog front-end bias rail (via RESET IN) to initiate graceful shutdown before data corruption. Use Value: Guaranteed reset assertion down to VCC = 1V prevents undefined MCU state during deep discharge, improving field reliability. |
Use Scenario: Smartwatch with separate 1.2V SoC core and 3.0V display driver supply. IC Role / Device Role / Timing Role: Uses RESET IN to supervise display rail while VCC monitors SoC supply - single IC replaces two discrete supervisors. Use Value: Reduces component count and PCB real estate in constrained wearable form factors without sacrificing supervision coverage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388LT19D4-T | Same electrical specs but in 6-pin μDFN (L611+1) instead of 4-pin SC70 - larger footprint, better thermal performance (θJA = 477°C/W vs. 322.6°C/W) | Suitable for thermally demanding industrial environments where SC70 self-heating may affect long-term threshold stability | Select when board layout allows larger package and thermal management is prioritized over size |
| TLV809K33DBZR | Single-supply 3.3V supervisor (no RESET IN), 140ms timeout, SOT-23-3 package - lacks dual-monitoring and adjustable threshold capability | Applicable only for single-rail systems where auxiliary monitoring is unnecessary and shorter reset hold time is acceptable | Choose only for cost-sensitive, single-rail designs where dual supervision adds no value |
Compared with MAX6388XS19D4-T, the μDFN variant offers superior thermal dissipation for high-ambient applications, while TLV809K33DBZR sacrifices dual-rail capability and precision for lower cost and smaller pin count - neither is pin-compatible, and both require PCB redesign.
Availability
MAX6388XS19D4-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, portable medical sensors, and dual-voltage wearable devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6388XS19D4-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, and computing applications, with emphasis on low-power, high-reliability solutions.
The MAX6381–MAX6390 family delivers single/dual low-voltage μP reset circuits optimized for space-constrained, battery-operated, and automotive-grade systems requiring guaranteed reset behavior across wide temperature and supply ranges.
FAQ
What is the exact reset threshold voltage of MAX6388XS19D4-T and how stable is it over temperature?
The MAX6388XS19D4-T has a factory-set nominal VCC reset threshold of 1.90V, with ±2.5% tolerance guaranteed over the full operating temperature range of –40°C to +125°C. This stability is achieved through laser-trimmed internal references and BiCMOS process design, ensuring consistent brownout detection without external calibration. The MAX6388XS19D4-T maintains this accuracy even under rapid thermal cycling typical in automotive under-hood environments.
Does MAX6388XS19D4-T support manual reset functionality via an MR pin?
No, MAX6388XS19D4-T does not include a manual reset (MR) input. According to the official selector guide and pin configuration diagrams, MR is only present on MAX6384, MAX6385, MAX6386, and MAX6390 - not on MAX6387, MAX6388, or MAX6389. The MAX6388XS19D4-T relies solely on VCC and RESET IN monitoring for automatic reset assertion, with no provision for external manual trigger.
What is the function of the RESET IN pin on MAX6388XS19D4-T and how is its threshold determined?
The RESET IN pin on MAX6388XS19D4-T connects to an internal comparator referenced to a precision 1.27V bandgap voltage. When the voltage at RESET IN falls below 1.27V, the device asserts RESET. Users set custom thresholds using an external resistor divider - for example, a 100kΩ top resistor and 100kΩ bottom resistor yields a 2.54V trip point. The MAX6388XS19D4-T's RESET IN input draws only ±1nA leakage, enabling high-impedance divider networks without accuracy loss.
Can MAX6388XS19D4-T operate reliably when VCC drops below 1.8V?
Yes, MAX6388XS19D4-T is fully specified to operate down to VCC = 1.0V, and its RESET output state remains guaranteed valid at all supply levels within that range. Electrical characteristics confirm proper reset assertion and timing behavior even at 1.0V, making the MAX6388XS19D4-T suitable for deep brownout scenarios in energy-harvesting or severely depleted battery applications where other supervisors fail to maintain deterministic output.
Is MAX6388XS19D4-T pin-compatible with older Maxim reset ICs like MAX809?
No, MAX6388XS19D4-T is not pin-compatible with MAX809 or similar legacy 3-pin supervisors. While the datasheet notes functional compatibility and pin-to-pin equivalence *within certain families* (e.g., MAX6384–MAX6390 series), MAX6388XS19D4-T uses a 4-pin SC70 package with dedicated RESET IN, whereas MAX809 uses a 3-pin SOT-23 with only VCC, GND, and RESET. Replacing MAX809 with MAX6388XS19D4-T requires PCB layout revision and signal reassignment.
MAX6388XS19D4-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:
- 1.9V, 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
MAX6388XS19D4-T FAQ
1.How can I place an order for MAX6388XS19D4-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS19D4-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 MAX6388XS19D4-T reliable?
The price and inventory of MAX6388XS19D4-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS19D4-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS19D4-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS19D4-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS19D4-T?
MAX6388XS19D4-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS19D4-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 MAX6388XS19D4-T?
For technical support, including MAX6388XS19D4-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS19D4-T requirements.
6.How does Aetrix verify that MAX6388XS19D4-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS19D4-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 MAX6388XS19D4-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS19D4-T?
All MAX6388XS19D4-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS19D4-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 MAX6388XS19D4-T part is unused and in its original packaging.
Return procedure for MAX6388XS19D4-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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