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Analog Devices Inc./Maxim Integrated MAX6423US26+
- Part No.:
- MAX6423US26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6423US26+.pdf
- Description:
- IC MPU/RESET CIRC 2.70V SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,197
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Product details
Overview
MAX6423US26+ from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.625V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (3.0–5.75ms with 1500pF), and guaranteed operation down to VCC = 1V. It monitors supply voltage in battery-powered embedded controllers and portable equipment to prevent code execution errors during brownout.
For engineers reviewing the MAX6423US26+ datasheet, MAX6423US26+ pinout, MAX6423US26+ application, or MAX6423US26+ equivalent, key selection criteria include its SC70-4 package, 1.6µA typical quiescent current, open-drain RESET compatibility with mixed-voltage µP interfaces, and immunity to sub-50µs VCC transients at 100mV overdrive.
Technical Context
This device implements a precision voltage-detection circuit with laser-trimmed resistors to set the 2.625V reset threshold and a 240nA internal ramp current source that charges an external SRT capacitor to generate the reset timeout delay. The reset assertion logic is fully analog and independent of digital control blocks.
The open-drain RESET output requires an external pullup (10kΩ–100kΩ) and supports wired-OR configuration with auxiliary reset sources. Its valid operation down to VCC = 1V ensures reliable reset signaling across wide supply droop conditions without requiring additional level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.625V ±2.5% (factory-laser-trimmed; enables precise brownout detection for 2.8V/3.3V systems) |
| Quiescent Current | 1.6µA typ at VCC ≤ 2.0V (enables multi-year battery life in always-on monitoring applications) |
| Reset Timeout Range | 0.275ms to >6ms (set by external SRT capacitor; 3.0–5.75ms at 1500pF) |
| VCC Operating Range | 1.0V to 5.5V (guaranteed reset validity down to 1V supports ultra-low-power wake-up sequencing) |
| Output Type | Active-low open-drain (allows flexible pullup to any voltage ≤5.5V; enables wired-OR reset arbitration) |
| Transient Immunity | No reset issued for VCC glitches ≤50µs duration when overdrive = 100mV (rejects noise without external filtering) |
| Operating Temperature | -40°C to +125°C (qualified for automotive under-hood and industrial embedded environments) |
Pinout & Package
MAX6423US26+ is housed in a 4-pin SC70 package (outline 21-0098, land pattern 90-0187), measuring 1.25mm × 0.85mm × 0.55mm, suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply voltage input and reset threshold monitor | Primary power rail connection; internal voltage reference derived directly from this pin |
| 2 - GND | Ground reference | Analog and digital ground return; must be low-impedance path for accurate threshold sensing |
| 3 - RESET | Active-low open-drain reset output | Drives low during reset; requires external pullup; compatible with 0–5.5V logic domains |
| 4 - SRT | Set-reset-time capacitor connection | Accepts external timing capacitor (CSRT); 240nA ramp current sets timeout period per tRP = 2.73×10⁶×CSRT + 275µs |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (0.275ms–6ms+) to match µP reset requirements without firmware changes |
| Open-drain RESET with 0–5.5V pullup flexibility | Permits direct interface to µPs operating at different I/O voltages (e.g., 1.8V core + 3.3V I/O) without level shifters |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion even during deep brownout, eliminating race conditions in low-VCC startup |
| Immunity to short VCC transients (≤50µs @ 100mV) | Reduces need for bulk capacitance and EMI filtering on VCC rail, simplifying power delivery design |
| Laser-trimmed 2.625V threshold (±2.5% over temp) | Eliminates external resistor divider; achieves high accuracy without calibration or temperature compensation circuitry |
Applications
| Portable Medical Sensors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Wearable ECG patch operating from coin-cell battery with intermittent BLE transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET to ARM Cortex-M0+ during VCC sag below 2.625V. Use Value: Prevents corrupted sensor data writes to flash memory during brownout, enabled by 1.6µA ICC and guaranteed reset down to VCC = 1V. |
Use Scenario: Remote RTU monitoring pipeline pressure using LoRaWAN, powered by Li-SOCl₂ battery. IC Role / Device Role / Timing Role: Brownout detector holding microcontroller in reset until stable 3.3V rail is established after cold-start. Use Value: Ensures deterministic boot sequence via 3.0–5.75ms capacitor-set timeout, eliminating erratic behavior from marginal VCC conditions. |
| Automotive Body Control Modules | Smart Home Hub Power Sequencing |
Use Scenario: Door module with LIN transceiver and EEPROM, exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Reset generator immune to 50µs VCC glitches, preventing spurious resets during engine cranking. Use Value: Achieves AEC-Q100-compatibility (via MAX6340 family lineage) and eliminates false triggers without adding RC filters. |
Use Scenario: Voice-controlled hub integrating Wi-Fi SoC, audio codec, and USB-C PD controller. IC Role / Device Role / Timing Role: System-level supervisor coordinating power-up of multiple rails using open-drain wired-OR RESET bus. Use Value: Enables hierarchical reset arbitration-MAX6423US26+ holds system in reset until all DC/DC converters stabilize and FPGA config completes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423US26T | Same die, tape-and-reel packaging (no + suffix); identical electrical specs and SC70-4 footprint | No functional difference; intended for automated SMT assembly vs. sample evaluation | Select MAX6423US26+ for prototyping and small-batch builds where lead-free compliance and tube packaging are preferred. |
| NCP302LSN26T1G | Fixed 2.63V threshold, 200ms min reset timeout, push-pull output, SOT23-3 package | Lacks adjustable timeout and open-drain flexibility; higher ICC (3.5µA); no transient immunity spec | Choose only if fixed long timeout and simpler 3-pin layout outweigh need for glitch immunity and multi-rail compatibility. |
Compared with MAX6423US26T and NCP302LSN26T1G, the MAX6423US26+ offers unique value through its capacitor-tunable reset delay, open-drain output enabling wired-OR reset networks, and documented immunity to 50µs VCC transients-critical for robust operation in noisy automotive and industrial power environments.
Availability
MAX6423US26+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, and automotive body control modules requiring stable component supply with full RoHS compliance and traceable sourcing.
Supply support for MAX6423US26+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The MAX6423US26+ belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power microprocessor supervisors, designed specifically for reliable power-monitoring in space- and energy-constrained embedded systems where precision, low ICC, and transient resilience are mandatory.
FAQ
What is the exact reset threshold voltage of the MAX6423US26+?
The MAX6423US26+ features a factory-laser-trimmed reset threshold of 2.625V, with ±1.5% accuracy at +25°C and ±2.5% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the datasheet under suffix "26", and applies directly to the MAX6423US26+ part number-not inferred from adjacent variants.
Does the MAX6423US26+ require an external pullup resistor on the RESET pin?
Yes, the MAX6423US26+ has an active-low open-drain RESET output and requires an external pullup resistor (typically 10kΩ–100kΩ) to a logic-compatible voltage (0–5.5V). This is explicitly required per the Pin Description and Detailed Description sections, and omission will result in undefined logic levels on the reset line.
Can the MAX6423US26+ operate reliably when VCC drops below 1.6V?
Yes-the MAX6423US26+ guarantees valid reset assertion down to VCC = 1.0V, as stated in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal circuitry remains functional and the RESET output remains asserted until VCC rises above 2.625V, making it suitable for deep brownout recovery in ultra-low-power systems.
How is the reset timeout period calculated for the MAX6423US26+?
The reset timeout period (tRP) of the MAX6423US26+ is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the capacitor value in farads connected between SRT and GND. For example, a 1500pF capacitor yields 3.00–5.75ms timeout, per the Electrical Characteristics table under "Reset Timeout Period".
Is the MAX6423US26+ pin-compatible with other devices in the MAX642x family?
No-MAX6423US26+ uses a 4-pin SC70 package and shares pinout only with MAX6421/MAX6422/MAX6423 variants in SC70 or SOT143. It is not pin-compatible with 5-pin SOT23 variants like MAX6424/MAX6425/MAX6426 or MAX6340, as confirmed in the Selector Guide and Pin Configurations sections.
MAX6423US26+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-143-4
MAX6423US26+ FAQ
1.How can I place an order for MAX6423US26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423US26+ 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 MAX6423US26+ reliable?
The price and inventory of MAX6423US26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423US26+ is usually 5 days.
3.What payment methods are accepted for MAX6423US26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423US26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423US26+?
MAX6423US26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423US26+ 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 MAX6423US26+?
For technical support, including MAX6423US26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423US26+ requirements.
6.How does Aetrix verify that MAX6423US26+ is sourced from the original manufacturer or authorized distributors?
All MAX6423US26+ 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 MAX6423US26+ meets industry standards.
7.What is the process for return or replacement of MAX6423US26+?
All MAX6423US26+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423US26+, 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 MAX6423US26+ part is unused and in its original packaging.
Return procedure for MAX6423US26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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