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Analog Devices Inc./Maxim Integrated MAX6423US44+T
- Part No.:
- MAX6423US44+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6423US44+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,692
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Product details
Overview
MAX6423US44+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 4.375V nominal reset threshold (±2.5% over temperature), capacitor-adjustable reset timeout (3.0–5.75ms at CSRT = 1500pF), and guaranteed operation down to VCC = 1V. It monitors supply voltage in portable and battery-powered systems to prevent code execution errors during power-up, brownout, or power-down.
For engineers reviewing the MAX6423US44+T datasheet, MAX6423US44+T pinout, MAX6423US44+T application, or MAX6423US44+T equivalent, key selection criteria include its 4-pin SOT143 package, 1.6µA typical quiescent current, open-drain RESET compatibility with multiple logic supplies, immunity to short VCC transients, and factory-laser-trimmed reset threshold accuracy.
Technical Context
The MAX6423US44+T implements a precision voltage-monitoring circuit with a laser-trimmed internal reference and a 240nA SRT ramp current source that charges an external capacitor to set the reset timeout period. Its reset assertion logic is triggered when VCC falls below the 4.375V threshold, with hysteresis of 4 × VTH (≈17.5mV).
It operates across –40°C to +125°C, guarantees valid RESET output down to VCC = 1V, and features open-drain output requiring an external pullup resistor (10kΩ–100kΩ) for interfacing with µP reset inputs powered by different supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.375V nominal (±2.5% over –40°C to +125°C); ensures reliable detection of 4.5V system rail undervoltage before critical failure. |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V; enables multi-year battery life in always-on monitoring applications. |
| Reset Timeout Range | 3.0–5.75ms at CSRT = 1500pF; adjustable via external capacitor (CSRT = (tRP – 275µs)/2.735×10⁶) to match µP reset timing requirements. |
| VCC Operating Range | 1.0V to 5.5V; supports supervision of ultra-low-voltage logic rails and legacy 5V systems. |
| Output Type | Active-low open-drain RESET; allows wired-OR configuration and interface with any logic supply up to 5.5V using external pullup. |
| Reset Propagation Delay | 80µs max (VCC falling at 1mV/µs); provides fast response to supply collapse without false triggering on noise. |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood and industrial embedded environments. |
Pinout & Package
MAX6423US44+T is housed in a 4-pin SOT143 package (package code U4+1), with 1.3mm × 1.3mm footprint and 0.95mm height. Pin 1 is VCC, Pin 2 is GND, Pin 3 is RESET (open-drain), and Pin 4 is SRT (capacitor-connected timeout adjust input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply voltage and reset threshold monitor input | Primary power rail connection; voltage applied here determines reset activation point and powers internal circuitry. |
| 2 - GND | Ground reference | Return path for all internal currents and SRT capacitor discharge; must be low-impedance for accurate timeout timing. |
| 3 - RESET | Active-low open-drain reset output | Drives low during reset condition; requires external pullup to define high state; compatible with 0–5.5V logic supplies. |
| 4 - SRT | Set reset timeout input | Connects to external capacitor (CSRT) to program timeout; 240nA internal current source charges CSRT to 0.65V to deassert reset. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise matching to µP reset hold-time requirements across diverse platforms without firmware changes. |
| Open-drain RESET output | Supports wired-OR reset architecture and interoperability with mixed-voltage systems (e.g., 3.3V µP with 5V I/O rail). |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing undefined µP states in low-battery conditions. |
| Immunity to short VCC transients | Rejects glitches ≤50µs duration when VCC dips 100mV below threshold-critical for noisy automotive or industrial power rails. |
| Laser-trimmed reset threshold | Delivers ±1.5% accuracy at +25°C and ±2.5% over full temperature range-eliminates need for external calibration. |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
Use Scenario: Continuous glucose monitor operating from coin-cell battery with intermittent RF transmission. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during battery sag below 4.375V to halt transmission and preserve data integrity. Use Value: 1.6µA quiescent current extends operational life beyond 3 years; open-drain output interfaces directly with 3.3V µP reset pin while powered from 4.2V Li-ion rail. |
Use Scenario: Door module MCU subjected to load-dump and cold-crank transients in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Brownout detector holding MCU in reset until stabilized 5V supply reaches 4.375V after ignition cycle. Use Value: Immunity to ≤50µs transients prevents spurious resets during alternator switching; –40°C to +125°C rating ensures reliability under hood. |
| Industrial PLC I/O Subsystem | Portable Test Equipment |
Use Scenario: Remote analog input card powered from isolated 24V DC-DC converter with variable load-induced ripple. IC Role / Device Role / Timing Role: Supervises local 5V regulator output and asserts open-drain RESET to main controller upon undervoltage. Use Value: External CSRT capacitor sets 4.5ms timeout to exceed PLC watchdog window; SOT143 package fits space-constrained PCB layout. |
Use Scenario: Handheld oscilloscope with dual-supply FPGA (1.2V core, 3.3V I/O) and lithium-polymer battery management. IC Role / Device Role / Timing Role: Monitors 3.3V I/O rail and generates clean reset pulse synchronized to battery voltage recovery. Use Value: Factory-trimmed 4.375V threshold avoids margining errors; 80µs propagation delay ensures sub-microsecond response to supply collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423US43+T | 4.300V reset threshold (vs. 4.375V); otherwise identical pinout, package, and electrical specs. | Suitable where system rail tolerance requires earlier reset assertion before 4.375V dropout. | Select when design margin analysis shows 4.300V better aligns with worst-case 3.3V LDO dropout under load. |
| MAX6423US45+T | 4.500V reset threshold (vs. 4.375V); same SOT143 package and open-drain output. | Used when higher reset threshold is needed to accommodate 5V rail tolerance or reduce false triggers. | Choose for systems with tighter 5V supply regulation where 4.500V provides improved noise immunity. |
Compared with MAX6423US44+T, the US43+T offers earlier reset activation for conservative brownout protection, while the US45+T delays reset assertion to tolerate larger supply excursions-both maintain identical timing, current, and thermal performance in the same footprint.
Availability
MAX6423US44+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and industrial PLC I/O subsystems requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6423US44+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
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 MAX6423US44+T belongs to the MAX6340/MAX6421–MAX6426 family of ultra-low-power microprocessor supervisors, designed specifically for reliable power-on reset and brownout protection in space- and energy-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6423US44+T?
The MAX6423US44+T has a nominal reset threshold of 4.375V, with ±1.5% accuracy at +25°C and ±2.5% over the full operating temperature range (–40°C to +125°C). This value is laser-trimmed at wafer test and confirmed in the Electrical Characteristics table of the official Analog Devices datasheet (Rev 11, 9/24).
Does the MAX6423US44+T require an external capacitor, and what value sets a 4ms reset timeout?
Yes, the MAX6423US44+T requires an external capacitor (CSRT) between the SRT pin and GND to set the reset timeout. For a 4ms timeout, CSRT ≈ 1350pF, calculated using tRP = 2.73 × 10⁶ × CSRT + 275µs. Ceramic capacitors with leakage <10nA are recommended to ensure timing accuracy across temperature.
Can the MAX6423US44+T drive a 5V microcontroller reset input directly?
No-the MAX6423US44+T features an open-drain RESET output and cannot actively drive high. To interface with a 5V µP reset input, connect a pullup resistor (e.g., 10kΩ) from RESET to the 5V supply. The device sinks current when asserting reset and releases the line for the pullup to define the high state.
Is the MAX6423US44+T pin-compatible with other devices in the MAX642x family?
Yes-the MAX6423US44+T shares the same 4-pin SOT143 pinout and function mapping with all MAX6421, MAX6422, and MAX6423 variants (e.g., MAX6423US16+T, MAX6421US44+T). However, output type differs: only MAX6423 variants have open-drain RESET; MAX6421 uses push-pull active-low, and MAX6422 uses push-pull active-high.
What is the maximum operating junction temperature and thermal derating for the MAX6423US44+T?
The MAX6423US44+T has a maximum junction temperature of +150°C and a continuous power dissipation limit of 320mW at +70°C ambient. Above +70°C, it derates at 4mW/°C-so at +100°C ambient, maximum allowable dissipation drops to 200mW. This is specified for the 4-pin SOT143 package per the Absolute Maximum Ratings table.
MAX6423US44+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.375V
- 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
MAX6423US44+T FAQ
1.How can I place an order for MAX6423US44+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423US44+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 MAX6423US44+T reliable?
The price and inventory of MAX6423US44+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423US44+T is usually 5 days.
3.What payment methods are accepted for MAX6423US44+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423US44+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423US44+T?
MAX6423US44+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423US44+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 MAX6423US44+T?
For technical support, including MAX6423US44+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423US44+T requirements.
6.How does Aetrix verify that MAX6423US44+T is sourced from the original manufacturer or authorized distributors?
All MAX6423US44+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 MAX6423US44+T meets industry standards.
7.What is the process for return or replacement of MAX6423US44+T?
All MAX6423US44+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423US44+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 MAX6423US44+T part is unused and in its original packaging.
Return procedure for MAX6423US44+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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