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Analog Devices Inc./Maxim Integrated MAX6388XS26D3+T
- Part No.:
- MAX6388XS26D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS26D3+T.pdf
- Description:
- IC MPU/RESET CIRC 2.63V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,317
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Product details
Overview
MAX6388XS26D3+T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.63V VCC reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and auxiliary RESET IN input for monitoring a second voltage source. It operates from 1.0V to 5.5V supply and consumes only 3μA at 1.8V, targeting power-sensitive embedded systems requiring reliable brownout detection.
For engineers reviewing the MAX6388XS26D3+T datasheet, MAX6388XS26D3+T pinout, MAX6388XS26D3+T application, or MAX6388XS26D3+T equivalent, key selection considerations include its 4-pin SC70 package, guaranteed reset validity down to VCC = 1V, ±60ppm/°C reset threshold tempco, and compatibility with dual-rail systems where core and I/O supplies must be independently monitored.
Technical Context
The MAX6388XS26D3+T integrates two independent voltage comparators: one monitors VCC against a precision 2.63V internal reference, while the second compares an external voltage applied to the RESET IN pin against a fixed 1.27V internal reference. Reset assertion occurs if either comparator detects an undervoltage condition, and the active-high push-pull output remains asserted for ≥140ms after recovery.
It features built-in immunity to negative-going VCC transients up to 100mV overdrive for durations under ~10µs, and guarantees correct reset logic state down to VCC = 1V - enabling robust operation during deep brownouts. The device uses BiCMOS process technology and is AEC-Q100 qualified in /V variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V nominal, ±2.5% over -40°C to +125°C - ensures accurate brownout detection across automotive and industrial temperature ranges |
| Reset Timeout Period | 140ms minimum - provides sufficient hold time for μP initialization and peripheral stabilization after power recovery |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year battery life in portable and energy-harvesting applications |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during severe undervoltage conditions down to near-dead-battery levels |
| RESET IN Threshold | 1.27V ±2.5% - allows precise secondary voltage monitoring via external resistor divider (e.g., for VCORE or analog supply) |
| Reset Output Type | Active-high push-pull - eliminates need for external pullup resistor and drives high-impedance μP reset inputs directly |
| Tempco | ±60ppm/°C - minimizes threshold drift over temperature, critical for stable operation in unregulated environments |
Pinout & Package
MAX6388XS26D3+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, suitable for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor input - powers internal circuitry and triggers reset when falling below 2.63V |
| 2 | RESET | Active-high push-pull output - asserts high during reset; sinks 80μA at VCC ≥ 1.0V, sources 150μA at VCC ≥ 1.8V |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate comparator operation |
| 4 | RESET IN | Auxiliary voltage monitor input - high-impedance (≤50nA leakage) node compared to 1.27V reference; used for dual-supply monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous VCC and RESET IN supervision enables reliable detection of failures in both main and auxiliary rails (e.g., I/O and core supplies) |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic μP reset behavior during deep brownouts where many supervisors fail silently |
| Negative-going transient immunity | Rejects sub-10µs VCC glitches up to 100mV amplitude - prevents spurious resets in noisy power environments |
| Factory-trimmed precision threshold | 2.63V reset point with ±2.5% tolerance over full temperature range eliminates need for external calibration |
| Low quiescent current | 3μA at 1.8V enables integration into always-on subsystems without compromising battery runtime |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors both 5V I/O rail and 3.3V microcontroller core supply in a distributed control unit exposed to wide ambient temperature swings and load dump transients. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting active-high reset to ARM Cortex-M4 during undervoltage on either rail, with 140ms timeout ensuring firmware reload completion. Use Value: Prevents erratic execution caused by partial power loss; RESET IN pin enables direct connection to core regulator feedback node for tighter voltage margin control. |
Use Scenario: Embedded in door module electronics requiring AEC-Q100 compliance, monitoring 12V-derived 5V supply and isolated 3.3V CAN transceiver rail. IC Role / Device Role / Timing Role: Supervises two independent power domains and generates synchronized reset pulse to MCU and CAN PHY upon any rail failure. Use Value: Eliminates need for discrete comparators and timers; 4-pin SC70 footprint reduces BOM count and board area versus dual discrete solutions. |
| Portable Medical Sensor Hub | Battery-Powered IoT Edge Node |
Use Scenario: Powers clinical-grade temperature/humidity sensor array with coin-cell battery; requires ultra-low current consumption and reliable wake-from-reset behavior. IC Role / Device Role / Timing Role: Resets BLE SoC during battery voltage sag below 2.63V and monitors sensor bias supply via RESET IN to prevent corrupted ADC readings. Use Value: 3μA supply current extends shelf life beyond 5 years; guaranteed reset assertion at VCC = 1V ensures safe shutdown before data corruption occurs. |
Use Scenario: Deployed in remote environmental monitor using Li-SOCl₂ primary cell; must survive 10-year deployment with periodic wake-up cycles and cold-temperature operation. IC Role / Device Role / Timing Role: Provides brownout protection for ESP32-WROVER and supervises backup RTC supply via RESET IN to maintain timekeeping integrity. Use Value: ±2.5% threshold accuracy over -40°C to +125°C avoids false resets in freezer or desert deployments; SC70 package enables conformal coating compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6388LT26D3+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) | Suitable for thermally dense layouts where µDFN's smaller footprint offsets lower power dissipation capability | Select when board space is more constrained than thermal budget, or when µDFN land pattern already exists in design |
| TLV809K26DBZR | Single-supply, 2.63V reset threshold, 140ms timeout, SOT-23-3 package - lacks RESET IN input and operates only down to VCC = 1.6V | Applicable only for single-rail systems; cannot replace dual-monitoring function of MAX6388XS26D3+T | Choose only if auxiliary voltage monitoring is unnecessary and SOT-23-3 footprint is preferred for cost or legacy reasons |
Compared with MAX6388LT26D3+T, the SC70 variant offers better thermal performance and simpler routing; versus TLV809K26DBZR, MAX6388XS26D3+T delivers essential dual-supply supervision and deeper undervoltage operation - making it irreplaceable in systems requiring guaranteed reset below 1.6V or secondary rail monitoring.
Availability
MAX6388XS26D3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and portable medical sensor hubs requiring stable component supply, long-term lifecycle support, and AEC-Q100-aligned reliability.
Supply support for MAX6388XS26D3+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 communications applications, emphasizing low power, high reliability, and small form factors.
The MAX6381–MAX6390 family was engineered specifically for microprocessor reset supervision in space- and power-constrained systems, delivering dual-voltage monitoring, factory-trimmed thresholds, and guaranteed operation down to 1V - addressing critical gaps in legacy reset ICs.
FAQ
What is the exact reset threshold voltage of MAX6388XS26D3+T and how stable is it over temperature?
The MAX6388XS26D3+T has a factory-set nominal reset threshold of 2.63V, with guaranteed tolerance of ±2.5% over the full operating temperature range of -40°C to +125°C. Its temperature coefficient is ±60ppm/°C, meaning threshold drift is limited to approximately ±0.015V across the entire range - ensuring consistent brownout detection in automotive and industrial environments where thermal stability is critical. This specification is validated per the MAX6381–MAX6390 datasheet revision 7.
Does MAX6388XS26D3+T support monitoring of a second voltage rail, and how is it implemented?
Yes, MAX6388XS26D3+T supports dual-voltage supervision via its dedicated RESET IN pin (Pin 4). This high-impedance input compares an external voltage to an internal 1.27V reference; reset asserts if that voltage falls below threshold. To monitor a second rail (e.g., a 3.3V core supply), connect a resistor divider between the rail and GND, with the midpoint fed to RESET IN - allowing user-defined thresholds using R1 = R2 × ((VINTH/1.27V) − 1). The MAX6388XS26D3+T datasheet provides full design equations and layout guidance.
What is the reset output configuration of MAX6388XS26D3+T, and does it require external components?
MAX6388XS26D3+T features an active-high push-pull reset output (Pin 2), which actively drives high during reset and low otherwise - eliminating the need for an external pullup resistor. It can source up to 150μA at VCC ≥ 1.8V and sink 80μA at VCC ≥ 1.0V, directly interfacing with standard CMOS μP reset inputs. Unlike open-drain variants, this configuration ensures fast, low-impedance transitions without external passive components, simplifying PCB layout and improving noise immunity.
Can MAX6388XS26D3+T operate reliably during severe brownout conditions where VCC drops below 1.8V?
Yes, MAX6388XS26D3+T guarantees correct reset output logic state down to VCC = 1.0V - far below typical 1.8V logic thresholds. Its internal circuitry remains functional and the reset output remains asserted until VCC recovers above 2.63V and the 140ms timeout expires. This capability is explicitly characterized in the datasheet's "Electrical Characteristics" table and "Ensuring a Valid RESET Output Down to VCC = 0V" section, making MAX6388XS26D3+T suitable for battery-powered systems experiencing deep discharge events.
Is MAX6388XS26D3+T pin-compatible with other devices in the MAX6381–MAX6390 family, and what package options exist?
MAX6388XS26D3+T uses a 4-pin SC70 package and is pin-compatible with other 4-pin SC70 variants in the family (e.g., MAX6384XS26D3+T, MAX6385XS26D3+T), sharing identical pinout: Pin 1 = VCC, Pin 2 = RESET, Pin 3 = GND, Pin 4 = RESET IN. It is not pin-compatible with 3-pin SC70 or 6-pin µDFN versions due to differing pin counts and functions. The same part number with "LT" prefix (e.g., MAX6388LT26D3+T) denotes the µDFN variant, requiring different land pattern and routing.
MAX6388XS26D3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.63V, 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
MAX6388XS26D3+T FAQ
1.How can I place an order for MAX6388XS26D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS26D3+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 MAX6388XS26D3+T reliable?
The price and inventory of MAX6388XS26D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS26D3+T is usually 5 days.
3.What payment methods are accepted for MAX6388XS26D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS26D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS26D3+T?
MAX6388XS26D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS26D3+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 MAX6388XS26D3+T?
For technical support, including MAX6388XS26D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS26D3+T requirements.
6.How does Aetrix verify that MAX6388XS26D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6388XS26D3+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 MAX6388XS26D3+T meets industry standards.
7.What is the process for return or replacement of MAX6388XS26D3+T?
All MAX6388XS26D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS26D3+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 MAX6388XS26D3+T part is unused and in its original packaging.
Return procedure for MAX6388XS26D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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