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Analog Devices Inc./Maxim Integrated MAX6388XS21D7-T
- Part No.:
- MAX6388XS21D7-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS21D7-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,119
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Product details
Overview
MAX6388XS21D7-T from Maxim Integrated is a low-power microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.10V VCC reset threshold (±2.5% over -40°C to +125°C), 1200ms 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, enabling reliable power-up/brownout detection in space-constrained battery-powered systems.
For engineers reviewing the MAX6388XS21D7-T datasheet, MAX6388XS21D7-T pinout, MAX6388XS21D7-T application, or MAX6388XS21D7-T equivalent, key selection criteria include its 2.10V reset threshold accuracy, 1200ms VCC timeout, 4-pin SC70 package, auxiliary voltage monitoring capability, and guaranteed reset validity down to VCC = 1V.
Technical Context
The MAX6388XS21D7-T integrates a precision bandgap reference and comparator to monitor VCC against a fixed 2.10V threshold while simultaneously accepting an external voltage via RESET IN (compared to internal 1.27V reference). Its internal timer ensures reset assertion for ≥1200ms after VCC recovery, independent of transient immunity behavior.
It features a dedicated high-impedance RESET IN input with ≤50nA leakage, enabling resistor-divider-based threshold programming for secondary rail monitoring, and guarantees correct push-pull reset logic state across full 1.0V–5.5V VCC range - critical for ultra-low-voltage brownout protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.10V ±2.5% (–40°C to +125°C); enables precise brownout detection for 2.1V–2.2V core rails |
| VCC Reset Timeout | 1200ms min; ensures μP remains held in reset long enough for stable power rail settling |
| Supply Current | 3μA at VCC = 1.8V; supports multi-year battery life in always-on monitoring applications |
| RESET Output Type | Active-high push-pull; eliminates need for external pullup and drives high/low actively |
| RESET IN Threshold | 1.27V ±2.5% (–40°C to +125°C); allows user-defined secondary reset point via resistor divider |
| Operating Voltage Range | 1.0V to 5.5V; guarantees valid reset signaling even during deep brownout or partial power loss |
| Reset Validity Down to | VCC = 1.0V; ensures deterministic reset state before supply collapse |
Pinout & Package
MAX6388XS21D7-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, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail; powers internal circuitry and sets reset threshold reference |
| 2 | RESET | Active-high push-pull output; asserts high during reset condition and deasserts low when VCC and RESET IN exceed thresholds |
| 3 | GND | Analog/digital ground reference; must be low-impedance connection to minimize noise coupling into reset comparator |
| 4 | RESET IN | Auxiliary voltage monitor input; compared to internal 1.27V reference; enables dual-rail supervision without external comparators |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneous monitoring of VCC (2.10V) and external rail via RESET IN (1.27V reference), eliminating need for second supervisor IC |
| Ultra-low quiescent current | 3μA at 1.8V enables >10-year battery life in coin-cell–powered IoT sensors and wearables |
| Guaranteed reset validity | Correct logic state maintained down to VCC = 1.0V, ensuring fail-safe behavior during catastrophic brownout |
| Negative-going transient immunity | Rejects short VCC glitches (e.g., <1µs at 100mV overdrive), preventing spurious resets in noisy environments |
| Factory-trimmed accuracy | ±2.5% reset threshold tolerance over full industrial temperature range reduces calibration overhead in production test |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
Use Scenario: Continuous environmental monitoring using coin-cell power with dual-rail MCU (1.8V core, 3.3V I/O). IC Role / Device Role / Timing Role: Supervises both VCC (1.8V) and I/O supply (3.3V via RESET IN divider) to prevent firmware corruption during partial rail collapse. Use Value: 1200ms timeout ensures complete MCU initialization before release; 3μA current extends 10+ year battery life. | Use Scenario: Modular I/O expansion with isolated analog inputs requiring stable power sequencing. IC Role / Device Role / Timing Role: Monitors main 5V supply and auxiliary 3.3V isolation rail; asserts reset if either drops below safe operating level. Use Value: Dual-input capability replaces two discrete supervisors, reducing BOM count and PCB area by 30%. |
| Medical Wearable ECG Patch | Automotive Body Control Module (BCM) |
Use Scenario: Ultra-low-power ECG acquisition system powered by rechargeable Li-ion with strict safety-critical boot integrity requirements. IC Role / Device Role / Timing Role: Ensures processor remains held in reset until both battery voltage and analog front-end supply stabilize post-power-on. Use Value: Guaranteed reset validity down to 1.0V prevents undefined state during deep discharge; ±2.5% threshold accuracy meets ISO 13485 traceability needs. | Use Scenario: BCM subassembly monitoring 12V main supply and 5V microcontroller rail in harsh automotive environment. IC Role / Device Role / Timing Role: Detects brownout on 5V rail while rejecting engine cranking transients via built-in glitch immunity. Use Value: Negative-going transient immunity eliminates false resets during cold-cranking; AEC-Q100 qualified version available (MAX6388XS21D7/V+T). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388LT21D7-T | Same electrical specs but in 6-pin μDFN (1.5mm × 1.5mm) instead of 4-pin SC70; higher thermal resistance (θJA = 477°C/W vs. 322.6°C/W) | Better suited for thermally constrained multilayer boards where SC70 footprint is insufficient | Select when board layout requires smaller height or improved thermal dissipation under sustained load |
| TPS3808G33DBVR | 3.3V fixed threshold (not adjustable), 200ms timeout (not 1200ms), 1.6μA typical ICC at 3.3V; no RESET IN input | Limited to single-rail 3.3V systems; lacks dual-supply monitoring capability | Choose only for cost-sensitive, single-threshold applications where auxiliary monitoring is unnecessary |
Compared with MAX6388LT21D7-T, the MAX6388XS21D7-T offers superior board-level space efficiency in 4-pin SC70, while versus TPS3808G33DBVR, it delivers essential dual-rail supervision and extended 1200ms timeout - critical for complex embedded boot sequences.
Availability
MAX6388XS21D7-T is available at Aetrix Electronics and suitable for battery-powered IoT sensor nodes, medical wearable devices, industrial PLC I/O modules, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6388XS21D7-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 microprocessor supervisory circuits targeting space- and energy-constrained embedded systems requiring dual-voltage monitoring and guaranteed reset behavior across wide temperature ranges.
FAQ
What is the exact reset threshold voltage of MAX6388XS21D7-T and how stable is it over temperature?
The MAX6388XS21D7-T has a factory-set VCC reset threshold of 2.10V, specified with ±2.5% tolerance over the full –40°C to +125°C operating range. This stability is achieved through laser-trimmed bandgap references and matched comparator design, ensuring consistent brownout detection regardless of ambient conditions. The MAX6388XS21D7-T maintains this accuracy without external calibration.
Does MAX6388XS21D7-T support monitoring of a second voltage rail, and how is it implemented?
Yes, the MAX6388XS21D7-T includes a dedicated RESET IN pin that compares an external voltage to an internal 1.27V reference. To monitor a second rail, connect a resistor divider between that rail and GND, feeding the midpoint to RESET IN. The MAX6388XS21D7-T asserts reset if either VCC falls below 2.10V or the divided voltage at RESET IN drops below 1.27V - enabling true dual-supply supervision in one device.
What is the reset timeout duration for MAX6388XS21D7-T, and is it configurable?
The MAX6388XS21D7-T provides a fixed minimum reset timeout of 1200ms after VCC rises above the 2.10V threshold. This value is factory-programmed and not user-configurable; it is selected by the "D7" suffix in the part number. The timeout ensures sufficient hold time for microprocessors to complete internal initialization and clock stabilization before release.
Can MAX6388XS21D7-T operate reliably at very low supply voltages, and what is the lower limit?
Yes, the MAX6388XS21D7-T guarantees correct reset output logic state down to VCC = 1.0V. Below this, internal circuitry may cease operation, but the device ensures deterministic behavior up to the limit. This capability is critical for detecting deep brownout events in battery-powered systems where voltage decay below 1.5V is common prior to shutdown.
What package type and footprint does MAX6388XS21D7-T use, and are land patterns available?
The MAX6388XS21D7-T uses a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. Official land patterns and solder mask recommendations are published by Maxim Integrated and accessible via their package database. This compact footprint supports high-density PCB layouts typical in portable and wearable electronics.
MAX6388XS21D7-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:
- 2.1V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 1.2s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6388XS21D7-T FAQ
1.How can I place an order for MAX6388XS21D7-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS21D7-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 MAX6388XS21D7-T reliable?
The price and inventory of MAX6388XS21D7-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS21D7-T is usually 5 days.
3.What payment methods are accepted for MAX6388XS21D7-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS21D7-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS21D7-T?
MAX6388XS21D7-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS21D7-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 MAX6388XS21D7-T?
For technical support, including MAX6388XS21D7-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS21D7-T requirements.
6.How does Aetrix verify that MAX6388XS21D7-T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS21D7-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 MAX6388XS21D7-T meets industry standards.
7.What is the process for return or replacement of MAX6388XS21D7-T?
All MAX6388XS21D7-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS21D7-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 MAX6388XS21D7-T part is unused and in its original packaging.
Return procedure for MAX6388XS21D7-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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