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Analog Devices Inc./Maxim Integrated MAX6390XS29D4+T
- Part No.:
- MAX6390XS29D4+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6390XS29D4+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,352
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Product details
Overview
MAX6390XS29D4+T from Maxim Integrated is a low-power microprocessor supervisory circuit with open-drain active-low reset output, factory-set 2.93V VCC reset threshold (±2.5% over –40°C to +125°C), 1120ms minimum VCC reset timeout, and 140ms minimum manual reset timeout. It monitors single-supply voltage in battery-powered or space-constrained embedded systems and guarantees valid reset state down to VCC = 1V.
For engineers reviewing the MAX6390XS29D4+T datasheet, MAX6390XS29D4+T pinout, MAX6390XS29D4+T application, or MAX6390XS29D4+T equivalent, key selection criteria include its dual-timing reset architecture (asymmetric VCC vs. MR timeout), 4-pin SC70 package footprint, ±2.5% threshold accuracy over temperature, and compatibility with 1.8V–5.0V supply rails in portable and automotive-qualified designs.
Technical Context
The MAX6390XS29D4+T implements a precision bandgap-based voltage comparator for VCC monitoring and a separate timing circuit that enforces distinct timeout periods: 1120ms (min) after VCC recovery and 140ms (min) after manual reset release. Its internal 1.56kΩ MR pullup resistor enables direct switch-to-GND interface without external components.
Unlike earlier family members, MAX6390XS29D4+T uses an open-drain RESET output requiring an external pullup, supports only D4/D7 timing suffixes, and excludes auxiliary RESET IN functionality-distinguishing it from MAX6387–MAX6389 variants while retaining pin compatibility with legacy MAX809/MAX810 series.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.93V nominal, ±2.5% tolerance over –40°C to +125°C - ensures reliable brownout detection across industrial temperature range |
| VCC Reset Timeout | 1120ms minimum - provides extended hold-off during slow-ramping power supplies |
| Manual Reset Timeout | 140ms minimum - enables fast, user-initiated reset without interfering with main supply sequencing |
| Supply Current | 3μA at +1.8V - enables multi-year operation in coin-cell–powered IoT sensors |
| Reset Output Type | Open-drain active-low - allows wired-OR configuration and level translation across mixed-voltage systems |
| MR Pullup Resistance | 1.56kΩ internal - eliminates need for external pullup and supports direct momentary switch connection |
| Operating Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
Pinout & Package
MAX6390XS29D4+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 high-density PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Main supply input and monitored voltage rail - powers internal circuitry and feeds reset comparator |
| 2 | RESET | Open-drain active-low reset output - requires external pullup; sinks current when asserted |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC; logic low forces reset |
| 4 | GND | Analog/digital ground reference - must be connected to system ground plane for stable threshold operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset timeouts | 1120ms VCC recovery timeout + 140ms MR release timeout - decouples power-up stability from user-triggered reset behavior |
| Factory-trimmed voltage threshold | 2.93V ±2.5% over full temperature range - eliminates external resistor divider calibration |
| Ultra-low quiescent current | 3μA at 1.8V - extends battery life in always-on monitoring applications |
| Valid reset down to VCC = 1V | Guaranteed logic state integrity below typical LDO dropout - prevents spurious release during collapse |
| No external components required | Integrated MR pullup (1.56kΩ) and no RESET IN pin - reduces BOM count and layout area |
Applications
| Portable Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises 2.8V regulated rail; asserts reset if voltage sags below 2.93V during RF burst, holding μC in reset for 1120ms until stable. Use Value: Prevents corrupted sensor readings or failed BLE handshakes caused by transient brownout during transmit mode. | Use Scenario: Door module with LIN transceiver and EEPROM, operating from vehicle battery (9V–16V) via 3.3V LDO. IC Role / Device Role / Timing Role: Monitors 3.3V LDO output; triggers 140ms manual reset on wake-from-sleep command from MCU, ensuring deterministic firmware restart. Use Value: Enables rapid, glitch-free wake-up sequence without waiting for full 1120ms power-up timeout. |
| Industrial PLC I/O Submodule | Smart Energy Metering IC |
Use Scenario: DIN-rail mounted I/O board with isolated 5V/3.3V rails, subject to EMI-induced supply dips. IC Role / Device Role / Timing Role: Detects 2.93V threshold violation on 3.3V domain; asserts open-drain RESET to multiple downstream ASICs sharing common pullup. Use Value: Wired-OR capability allows centralized reset coordination across isolated domains without level-shifter complexity. | Use Scenario: Revenue-grade meter using metrology SoC with strict power-on initialization timing. IC Role / Device Role / Timing Role: Provides 1120ms minimum reset pulse after AC/DC converter stabilizes - exceeds SoC's 800ms tPU requirement. Use Value: Eliminates need for external RC timing network, improving long-term reliability and reducing calibration drift risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326XR29D4+T | Same 2.93V threshold and 1120ms timeout, but push-pull active-low output and no MR input | Lacks manual reset capability; requires external pullup not needed for open-drain | Select when manual reset is unnecessary and board space permits larger 3-pin SC70 footprint |
| TLV809E29DBZR | 2.93V threshold, 140ms timeout, SOT-23-3 package, no MR input, 1.8μA ICC at 1.8V | Lower supply current but fixed single timeout - cannot support asymmetric VCC/MR timing | Choose for ultra-low-power applications where only one reset duration is required and SOT-23 layout is preferred |
Compared with MAX6326XR29D4+T and TLV809E29DBZR, MAX6390XS29D4+T uniquely delivers both VCC and MR with different timeout durations in a 4-pin SC70, enabling precise control of power-up sequencing and user-initiated recovery in compact, battery-sensitive designs.
Availability
MAX6390XS29D4+T is available at Aetrix Electronics and suitable for portable medical sensors, automotive body control modules, industrial PLC I/O submodules, and smart energy metering ICs requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6390XS29D4+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, communications, and computing markets.
The MAX6381–MAX6390 product line delivers low-power, factory-trimmed supervisory circuits optimized for reliable reset generation in space- and power-constrained embedded systems with demanding thermal and longevity requirements.
FAQ
What is the exact reset threshold voltage of MAX6390XS29D4+T and how tightly is it specified?
The MAX6390XS29D4+T has a factory-set nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range of –40°C to +125°C. This specification is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" and applies directly to the MAX6390XS29D4+T variant, not inferred from family data.
Does MAX6390XS29D4+T support manual reset, and what is its timeout behavior?
Yes, MAX6390XS29D4+T includes an active-low manual reset (MR) input with an internal 1.56kΩ pullup resistor. When MR is pulled low and released, MAX6390XS29D4+T asserts reset for a minimum of 140ms - distinct from its 1120ms VCC reset timeout - enabling fast, user-triggered recovery without affecting power-up sequencing.
What package type and pin count does MAX6390XS29D4+T use, and is it RoHS-compliant?
MAX6390XS29D4+T uses a 4-pin SC70 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm. The "+T" suffix confirms it is lead(Pb)-free and RoHS-compliant, as documented in the Ordering Information section of the datasheet.
Can MAX6390XS29D4+T operate reliably at very low supply voltages?
Yes, MAX6390XS29D4+T guarantees correct reset output logic state down to VCC = 1.0V, as stated in Absolute Maximum Ratings and Electrical Characteristics. This ensures deterministic behavior during deep brownout conditions where many competing supervisors fail to maintain valid output.
Is MAX6390XS29D4+T pin-compatible with older Maxim reset ICs like MAX809?
Yes, MAX6390XS29D4+T is explicitly listed as pin-compatible with MAX809/MAX810/MAX803 and other members of the MAX6326–MAX6348 series per the Features section. Its 4-pin SC70 footprint matches the pinout of MAX809 variants in same-package configurations, enabling drop-in replacement where timing and output type align.
MAX6390XS29D4+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:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6390XS29D4+T FAQ
1.How can I place an order for MAX6390XS29D4+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6390XS29D4+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 MAX6390XS29D4+T reliable?
The price and inventory of MAX6390XS29D4+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6390XS29D4+T is usually 5 days.
3.What payment methods are accepted for MAX6390XS29D4+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6390XS29D4+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6390XS29D4+T?
MAX6390XS29D4+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6390XS29D4+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 MAX6390XS29D4+T?
For technical support, including MAX6390XS29D4+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6390XS29D4+T requirements.
6.How does Aetrix verify that MAX6390XS29D4+T is sourced from the original manufacturer or authorized distributors?
All MAX6390XS29D4+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 MAX6390XS29D4+T meets industry standards.
7.What is the process for return or replacement of MAX6390XS29D4+T?
All MAX6390XS29D4+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6390XS29D4+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 MAX6390XS29D4+T part is unused and in its original packaging.
Return procedure for MAX6390XS29D4+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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