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Analog Devices Inc./Maxim Integrated MAX6423XS23+
- Part No.:
- MAX6423XS23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6423XS23+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:353
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Product details
Overview
MAX6423XS23+ from Maxim Integrated is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.313V ±2.5% factory-trimmed reset threshold, capacitor-adjustable reset timeout (275µs to 5.75ms), and guaranteed operation down to VCC = 1V. It monitors supply voltage in portable and battery-powered systems to prevent erroneous microprocessor execution during power-up, brownout, or power-down.
For engineers reviewing the MAX6423XS23+ datasheet, MAX6423XS23+ pinout, MAX6423XS23+ application, or MAX6423XS23+ equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, and validated alternative options for voltage-monitoring reset circuits in space-constrained embedded designs.
Technical Context
The MAX6423XS23+ implements a precision voltage-detection architecture using laser-trimmed resistors to set its 2.313V reset threshold with ±2.5% tolerance over –40°C to +125°C. Its internal 240nA current source charges an external SRT-to-ground capacitor to generate a programmable reset timeout period.
Reset assertion occurs when VCC falls below the threshold; deassertion requires both VCC rise above threshold and capacitor ramp voltage reaching 0.65V. The open-drain RESET output supports logic-level translation up to 5.5V via external pullup and enables wired-OR reset configurations with auxiliary circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.313V ±2.5% (factory-trimmed; ensures reliable detection of 2.3V rail collapse) |
| Supply Current | 1.6µA typ at VCC ≤ 2.0V (enables >1-year battery life in coin-cell–powered devices) |
| Reset Timeout Range | 275µs to 5.75ms (set by 0–1500pF capacitor; covers µP reset hold-time requirements from legacy to modern SoCs) |
| VCC Operating Range | 1.0V to 5.5V (valid reset assertion/deassertion even during deep brownout down to 1V) |
| Output Type | Active-low open-drain (supports level-shifting, wired-OR, and multi-rail reset coordination) |
| Temperature Range | –40°C to +125°C (qualified for automotive under-hood and industrial control environments) |
| VCC to Reset Delay | 80µs (guaranteed response to fast supply droop; prevents false resets from noise) |
Pinout & Package
MAX6423XS23+ is housed in a 4-pin SC70 package (package code X4+1, outline 21-0098), measuring 1.25mm × 1.25mm × 0.9mm with 0.65mm lead pitch. This ultra-small footprint targets high-density portable PCBs where board area is constrained.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input; connects to external capacitor to define reset pulse width via 240nA current ramp |
| 2 | GND | Ground reference for all internal circuitry and reset comparator; must be low-impedance connection |
| 3 | RESET | Active-low open-drain reset output; requires external pullup resistor (10kΩ–100kΩ) to target logic rail |
| 4 | VCC | Supply voltage input and monitored rail; powers device and serves as threshold reference source |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise matching to µP reset hold-time spec without firmware or layout change |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system restart even during severe brownout conditions before full power loss |
| Immunity to short VCC transients | Rejects <50µs glitches ≥100mV below threshold-critical for noisy automotive/industrial rails |
| Open-drain output with 5.5V-tolerant pullup | Permits direct interface to 1.8V, 3.3V, or 5V µP reset inputs without level translators |
| Low 1.6µA quiescent current | Minimizes battery drain in always-on monitoring applications such as medical wearables |
Applications
| Battery-Powered Portable Equipment | Automotive Body Control Module |
|---|---|
|
Use Scenario: Smart thermostat powered by CR2032 coin cell requiring >5-year shelf life and reliable cold-start reset. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET until VCC stabilizes above 2.313V and timeout expires. Use Value: 1.6µA supply current extends battery life; open-drain output interfaces directly to 3.3V MCU reset pin via 47kΩ pullup. |
Use Scenario: Door module ECU operating across –40°C to +125°C with 12V battery rail subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: Brownout detector holding MCU in reset during engine cranking-induced voltage sag below 2.313V. Use Value: ±2.5% threshold accuracy over temperature ensures consistent trip point; immunity to <50µs transients prevents spurious resets. |
| Medical Wearable Sensor Hub | Industrial Embedded Controller |
|
Use Scenario: ECG patch with ultra-low-power ARM Cortex-M0+ MCU that must avoid corrupted boot sequences during Li-ion battery voltage decay. IC Role / Device Role / Timing Role: Monitors 2.8V LDO output and asserts RESET when voltage drops below 2.313V during end-of-life discharge. Use Value: Valid reset assertion down to VCC = 1V guarantees safe shutdown before MCU enters undefined state; SC70 package saves PCB area. |
Use Scenario: Programmable logic controller (PLC) I/O module with dual 3.3V/5V rails requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Open-drain RESET output tied via wired-OR to auxiliary watchdog signal for fail-safe system halt. Use Value: Level-agnostic output allows shared reset bus across mixed-voltage subsystems without isolation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423US23+T | Same electrical specs and reset threshold, but in 4-pin SOT143 package (larger footprint, different land pattern) | Preferred where SOT143 assembly infrastructure exists or thermal dissipation margin is needed | Select MAX6423US23+T only if SC70 placement or reflow compatibility is unavailable. |
| NCP302LSN23T1G | Fixed 2.3V reset threshold, 220ms min timeout (non-adjustable), 1.1µA IQ, SOT23-3 package | Lacks capacitor-programmable timeout; suited for cost-sensitive, fixed-timing applications without fine-grained hold-time control | Choose NCP302LSN23T1G only when timeout flexibility is unnecessary and BOM simplification is prioritized. |
Compared with MAX6423XS23+, MAX6423US23+T offers identical functionality in a larger package for legacy assembly lines, while NCP302LSN23T1G trades timeout adjustability for lower cost and quiescent current-making it suitable only where fixed delay suffices and SC70 area savings are non-critical.
Availability
MAX6423XS23+ is available at Aetrix Electronics and suitable for battery-powered portable equipment, automotive body electronics, and medical wearable devices requiring stable component supply with long-term lifecycle support.
Supply support for MAX6423XS23+ 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 computing applications.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervision for space-constrained embedded systems where supply voltage integrity is mission-critical.
FAQ
What is the exact reset threshold voltage of MAX6423XS23+?
The MAX6423XS23+ features a factory-laser-trimmed reset threshold of 2.313V with ±1.5% accuracy at +25°C and ±2.5% over –40°C to +125°C. This value corresponds to the "23" suffix per Table 1 in the datasheet and is confirmed in the Electrical Characteristics table under VTH parameter.
Does MAX6423XS23+ support reset timeout adjustment, and how is it implemented?
Yes, MAX6423XS23+ supports capacitor-adjustable reset timeout via the SRT pin. An external capacitor (CSRT) between SRT and GND sets the timeout period using tRP = 2.73×10⁶ × CSRT + 275µs. With CSRT = 1500pF, timeout is 3.00–5.75ms; with CSRT = 0, it defaults to 275µs.
What package type and dimensions does MAX6423XS23+ use?
MAX6423XS23+ uses the 4-pin SC70 package (code X4+1, outline 21-0098), measuring 1.25mm × 1.25mm × 0.9mm with 0.65mm lead pitch. This ultra-compact footprint is optimized for high-density portable PCB layouts and matches industry-standard SC70 reflow profiles.
Can MAX6423XS23+ operate reliably during deep brownout conditions?
Yes, MAX6423XS23+ guarantees valid reset assertion and deassertion down to VCC = 1.0V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Its internal circuitry remains functional and produces deterministic output behavior even as supply voltage collapses-critical for fail-safe shutdown.
Is MAX6423XS23+ pin-compatible with other devices in the MAX642x family?
MAX6423XS23+ shares identical 4-pin SC70 pinout with MAX6421XSxx+ and MAX6422XSxx+, differing only in reset threshold and output polarity. It is not pin-compatible with 5-pin SOT23 variants (e.g., MAX6424UKxx+) or SOT143-packaged versions due to differing pin count and layout.
MAX6423XS23+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.313V
- 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:
- SC-70-4
MAX6423XS23+ FAQ
1.How can I place an order for MAX6423XS23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423XS23+ 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 MAX6423XS23+ reliable?
The price and inventory of MAX6423XS23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423XS23+ is usually 5 days.
3.What payment methods are accepted for MAX6423XS23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423XS23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423XS23+?
MAX6423XS23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423XS23+ 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 MAX6423XS23+?
For technical support, including MAX6423XS23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423XS23+ requirements.
6.How does Aetrix verify that MAX6423XS23+ is sourced from the original manufacturer or authorized distributors?
All MAX6423XS23+ 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 MAX6423XS23+ meets industry standards.
7.What is the process for return or replacement of MAX6423XS23+?
All MAX6423XS23+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423XS23+, 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 MAX6423XS23+ part is unused and in its original packaging.
Return procedure for MAX6423XS23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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