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Analog Devices Inc./Maxim Integrated MAX6388XS29D3+
- Part No.:
- MAX6388XS29D3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6388XS29D3+.pdf
- Description:
- IC MPU/RESET CIRC 2.93V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,860
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Product details
Overview
MAX6388XS29D3+ from Maxim Integrated is a low-power, dual-voltage microprocessor supervisory circuit with active-high push-pull reset output, factory-set 2.93V VCC reset threshold, and 140ms minimum reset timeout period. It monitors primary supply (VCC) and auxiliary voltage (RESET IN) and guarantees valid reset assertion down to VCC = 1V. Used in portable battery-powered equipment requiring reliable brownout detection and secondary rail monitoring.
For engineers reviewing the MAX6388XS29D3+ datasheet, MAX6388XS29D3+ pinout, MAX6388XS29D3+ application, or MAX6388XS29D3+ equivalent, key selection criteria include its dual-monitoring capability, ±2.5% reset threshold accuracy over –40°C to +125°C, 3μA supply current at 1.8V, 4-pin SC70 package, and compatibility with systems needing auxiliary voltage supervision without external comparators.
Technical Context
The MAX6388XS29D3+ integrates two independent reset comparators: one for VCC (2.93V threshold) and one for RESET IN (1.27V internal reference), enabling simultaneous monitoring of core and I/O rails. Its reset logic asserts an active-high push-pull output when either voltage falls below its respective threshold.
It features a dedicated MR input with internal 63kΩ pullup resistor and supports manual reset initiation with guaranteed 200ns MR-to-reset delay. The device operates across 1.0V–5.5V VCC and maintains reset state integrity during negative-going VCC transients up to 35µs (at 100mV overdrive).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V (nominal), ±2.5% tolerance over –40°C to +125°C - ensures precise brownout detection for 3.0V/3.3V systems |
| RESET Timeout Period | 140ms (min) - provides sufficient hold time for μP initialization after power recovery |
| Supply Current | 3μA at VCC = 1.8V - enables multi-year operation in coin-cell–powered devices |
| RESET Output Type | Active-high push-pull - eliminates need for external pullup resistor and drives high-impedance loads directly |
| Auxiliary Input | RESET IN comparator referenced to 1.27V - allows user-defined second-rail threshold via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout conditions |
| MR Input Pullup | 63kΩ internal resistor - simplifies manual reset implementation with momentary switch to GND |
Pinout & Package
MAX6388XS29D3+ 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 space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and primary voltage monitor rail - powers internal circuitry and sets fixed reset threshold |
| 2 | RESET | Active-high push-pull reset output - drives high during fault; deasserts after timeout when both VCC and RESET IN exceed thresholds |
| 3 | GND | Analog/digital ground reference - must be low-impedance connection to ensure accurate comparator operation |
| 4 | RESET IN | Auxiliary voltage monitor input - compared against internal 1.27V reference; enables dual-rail supervision without external components |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneous supervision of VCC (2.93V) and RESET IN (user-adjustable via resistor divider) - eliminates need for discrete comparator on secondary rail |
| Guaranteed reset validity down to VCC = 1V | Ensures deterministic μP reset state during severe brownout - critical for fail-safe embedded boot sequences |
| Negative-going transient immunity | Rejects VCC glitches ≤35µs at 100mV overdrive - prevents spurious resets in noisy power environments |
| Low quiescent current | 3μA at 1.8V - extends battery life in always-on monitoring applications such as IoT sensors and wearables |
| Factory-trimmed precision threshold | ±2.5% accuracy over full temperature range - removes need for calibration or trimming in production |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous physiological monitoring using coin-cell power with dual-rail (core + sensor interface) supplies. IC Role / Device Role / Timing Role: Supervises 1.8V core and 3.3V I/O rails; asserts reset if either drops below threshold during battery sag. Use Value: Prevents corrupted sensor data writes by halting μP execution until both rails stabilize post-brownout. | Use Scenario: Remote environmental logging in solar-charged edge nodes with fluctuating input voltage. IC Role / Device Role / Timing Role: Monitors main battery (VCC) and backup supercapacitor (via RESET IN) to initiate graceful shutdown before power loss. Use Value: Enables safe flash memory write completion using 140ms timeout - avoids filesystem corruption during sudden power drop. |
| Industrial Handheld Terminals | Dual-Voltage Microcontroller Modules |
Use Scenario: Ruggedized barcode scanners powered by Li-ion packs with dynamic load-induced voltage dips. IC Role / Device Role / Timing Role: Detects VCC sags below 2.93V and RESET IN dips below user-set threshold (e.g., 2.5V for peripheral rail). Use Value: Dual-trigger reset ensures system restart only after both processor and peripheral domains are stable - eliminates partial initialization failures. | Use Scenario: FPGA-based control modules requiring coordinated reset of 1.2V core and 3.3V I/O banks. IC Role / Device Role / Timing Role: Uses RESET IN to monitor I/O rail while VCC monitors core; single RESET output synchronizes both domains. Use Value: Reduces BOM count by replacing two discrete supervisors with one IC - saves PCB area and routing complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6387XS29D3+ | Same 2.93V VCC threshold and 140ms timeout, but open-drain active-low RESET output requiring external pullup | Suitable where system-level reset bus is shared and pulled up externally; incompatible with direct drive of active-high reset inputs | Select MAX6387XS29D3+ only if existing design uses open-drain topology and pullup already present |
| TPS3808G33DBVR | 2.93V threshold and 200ms timeout; higher 8μA ICC at 1.8V; no RESET IN input | Lacks auxiliary voltage monitoring - requires separate supervisor or comparator for dual-rail systems | Choose TPS3808G33DBVR only for single-rail applications where longer timeout and TI ecosystem alignment outweigh dual-monitoring loss |
Compared with MAX6387XS29D3+, MAX6388XS29D3+ eliminates external pullup needs and simplifies layout; versus TPS3808G33DBVR, it adds essential RESET IN capability for dual-supply coordination without increasing component count.
Availability
MAX6388XS29D3+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, industrial handheld terminals, and dual-voltage microcontroller modules requiring stable component supply and long-term lifecycle support.
Supply support for MAX6388XS29D3+ 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 voltage supervision for battery-critical and dual-rail embedded systems - engineered specifically for reliability in extended-temperature portable and industrial environments.
FAQ
What is the exact reset threshold voltage of the MAX6388XS29D3+?
The MAX6388XS29D3+ has a factory-set VCC reset threshold of 2.93V (nominal), with ±2.5% accuracy over the full operating temperature range of –40°C to +125°C. This value is confirmed in the Reset Thresholds table of the datasheet and applies specifically to the "29" suffix in the part number. The MAX6388XS29D3+ does not use adjustable or programmable thresholds - the 2.93V point is laser-trimmed during manufacturing.
Does the MAX6388XS29D3+ support monitoring of a second voltage rail?
Yes, the MAX6388XS29D3+ includes a dedicated RESET IN input that compares an external voltage against an internal 1.27V reference. When the voltage at RESET IN falls below this reference, the device asserts its active-high RESET output - enabling true dual-rail supervision. This feature is explicitly documented in the Pin Description and Applications Information sections for MAX6387/MAX6388/MAX6389 variants.
What is the function of Pin 4 on the MAX6388XS29D3+?
Pin 4 of the MAX6388XS29D3+ is the RESET IN terminal. It serves as a high-impedance input to the auxiliary reset comparator, allowing users to monitor a second voltage rail (e.g., I/O supply) via an external resistor divider. The internal 1.27V reference enables setting custom thresholds - for example, a 3.3V rail can be monitored by selecting R1/R2 to produce 1.27V at the divider midpoint when the rail reaches its lower limit.
Is the MAX6388XS29D3+ compatible with manual reset functionality?
No, the MAX6388XS29D3+ does not include a manual reset (MR) input. According to the Selector Guide and Pin Configurations, MR is present only on MAX6384/MAX6385/MAX6386/MAX6390 - not on MAX6387/MAX6388/MAX6389. The MAX6388XS29D3+ has four pins: VCC, RESET, GND, and RESET IN. Any requirement for pushbutton-initiated reset must be implemented externally.
What package type and dimensions does the MAX6388XS29D3+ use?
The MAX6388XS29D3+ is supplied in a 4-pin SC70 package (outline number 21-0098, land pattern 90-0187), measuring 2.0mm × 2.1mm × 0.95mm. This RoHS-compliant, lead(Pb)-free package is specified in the Ordering Information table under "MAX6388XS_ _D_+T" and confirmed in the Package Information section. It is distinct from the 3-pin SC70 (used by MAX6381–MAX6383) and 6-pin µDFN (used by LT-suffixed variants).
MAX6388XS29D3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Strip
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6388XS29D3+ FAQ
1.How can I place an order for MAX6388XS29D3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6388XS29D3+ 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 MAX6388XS29D3+ reliable?
The price and inventory of MAX6388XS29D3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6388XS29D3+ is usually 5 days.
3.What payment methods are accepted for MAX6388XS29D3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6388XS29D3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6388XS29D3+?
MAX6388XS29D3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6388XS29D3+ 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 MAX6388XS29D3+?
For technical support, including MAX6388XS29D3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6388XS29D3+ requirements.
6.How does Aetrix verify that MAX6388XS29D3+ is sourced from the original manufacturer or authorized distributors?
All MAX6388XS29D3+ 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 MAX6388XS29D3+ meets industry standards.
7.What is the process for return or replacement of MAX6388XS29D3+?
All MAX6388XS29D3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6388XS29D3+, 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 MAX6388XS29D3+ part is unused and in its original packaging.
Return procedure for MAX6388XS29D3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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