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Analog Devices Inc./Maxim Integrated MAX6423XS29+T
- Part No.:
- MAX6423XS29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6423XS29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,487
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Product details
Overview
MAX6423XS29+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 2.925V 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 erroneous code execution during power-up, brownout, or shutdown.
For engineers reviewing the MAX6423XS29+T datasheet, MAX6423XS29+T pinout, MAX6423XS29+T application, or MAX6423XS29+T equivalent, key selection criteria include its SC70-4 package, 1.6µA typical quiescent current, immunity to short VCC transients (<50µs at 100mV overdrive), and compatibility with multi-rail logic via external pullup.
Technical Context
The MAX6423XS29+T implements a precision voltage detector with laser-trimmed internal resistors to set its 2.925V reset threshold, and uses a 240nA constant-current source charging an external SRT capacitor to generate the reset timeout delay. Its open-drain RESET output requires an external pullup resistor (10kΩ–100kΩ) and supports logic-level translation across supplies up to 5.5V.
It operates across –40°C to +125°C, guarantees valid reset assertion down to VCC = 1V, and features hysteresis of 4 × VTH (≈11.7mV) to prevent chatter near threshold. The SRT pin is sensitive to stray capacitance and leakage, requiring careful PCB layout with short, isolated traces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V nominal (2.852V min / 2.998V max at –40°C to +125°C); ensures reliable detection of 3.3V rail brownout before µP malfunction. |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V; enables >10-year battery life in coin-cell–powered IoT sensors. |
| Reset Timeout | 3.0–5.75ms at CSRT = 1500pF; adjustable from 275µs upward via external capacitor for µP-specific hold times. |
| VCC Range | 1.0V to 5.5V; supports operation during deep brownout and compatibility with 1.8V/2.5V/3.3V/5V systems. |
| Output Type | Active-low open-drain RESET; allows wired-OR with auxiliary reset sources and level-shifting to any logic rail ≤5.5V. |
| Reset Propagation Delay | 80µs maximum (VCC falling at 1mV/µs); ensures fast response to supply collapse without false triggering on noise. |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood and industrial control environments. |
Pinout & Package
MAX6423XS29+T is housed in a 4-pin SC70-4 package (outline 21-0098), measuring 1.25mm × 0.85mm × 0.55mm, with wettable flanks for automated optical inspection. Pin 1 is marked by a dot or beveled edge.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VCC | Supply voltage input and reset threshold monitor node; must be decoupled locally with ≥0.1µF ceramic capacitor. |
| 2 | GND | Analog ground reference for internal comparator and current source; connect directly to system ground plane. |
| 3 | RESET | Active-low open-drain output; requires external pullup (10kΩ–100kΩ) to logic rail; sinks ≥500µA at VCC ≥ 1.8V. |
| 4 | SRT | Set-reset-time input; connects to external timing capacitor (CSRT) and ground; sensitive to leakage-keep trace short and isolated. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise µP reset hold time tuning (275µs to >100ms) without firmware or BOM changes. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic system reset even during severe brownout-no undefined logic states at µP reset pin. |
| Immunity to short VCC transients | Rejects glitches ≤50µs wide at 100mV below threshold, eliminating spurious resets in noisy power environments. |
| Low-leakage open-drain output | 1.0µA max leakage when deasserted-preserves signal integrity on shared reset buses with multiple supervisors. |
| Laser-trimmed threshold accuracy | ±1.5% at +25°C and ±2.5% over full temperature range-reduces need for margining in critical power monitoring. |
Applications
| Battery-Powered Medical Sensors | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell, operating intermittently for multi-year service life. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET during battery sag below 2.925V to halt sensor sampling and preserve data integrity. Use Value: 1.6µA quiescent current extends battery life beyond 5 years; open-drain output interfaces cleanly with 1.8V µP reset pin using 47kΩ pullup. |
Use Scenario: Door module controlling window lift, mirror fold, and interior lighting in passenger vehicles. IC Role / Device Role / Timing Role: Brownout detector ensuring µP remains held in reset until 12V supply stabilizes post-cranking. Use Value: –40°C to +125°C rating and AEC-Q100-aligned design (via MAX6340UK31/V+T family) support under-dash deployment; 80µs propagation delay prevents glitch-induced lockup. |
| Industrial Programmable Logic Controllers | Portable Test & Measurement Equipment |
|
Use Scenario: DIN-rail mounted PLC with dual 24V DC inputs and isolated I/O, requiring fail-safe startup sequencing. IC Role / Device Role / Timing Role: Primary supervisor validating main 5V logic rail before enabling FPGA configuration and communication peripherals. Use Value: Capacitor-adjustable timeout (set to 4.375ms) matches FPGA configuration clock requirements; open-drain output enables wired-OR with watchdog reset signal. |
Use Scenario: Handheld oscilloscope with Li-ion battery, 3.3V and 1.2V rails, and USB-C host interface. IC Role / Device Role / Timing Role: Reset generator for ARM Cortex-M7 core, triggered only when 3.3V rail drops below 2.925V during battery discharge. Use Value: 2.925V threshold aligns precisely with 3.3V rail tolerance; SC70-4 footprint saves space on dense front-end PCB; 100mV transient immunity prevents false resets during USB hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423US29+T | Same electrical specs and reset threshold, but in 4-pin SOT143-4 package (1.3mm × 1.5mm vs. SC70's 1.25mm × 0.85mm). | Preferred where board assembly uses SOT143-compatible pick-and-place tooling or thermal mass requirements differ. | Select MAX6423US29+T for legacy SOT143 footprint reuse or higher thermal dissipation needs (320mW vs. 245mW). |
| NCP302LSN29T1G | Fixed 2.93V threshold, push-pull output, 1.5µA IQ, but no capacitor-adjustable timeout (fixed 200ms). | Suitable for simpler systems needing long, fixed reset hold time-lacks flexibility for µP-specific timing. | Choose NCP302LSN29T1G only if fixed timeout suffices and push-pull drive eliminates need for external pullup. |
Compared with MAX6423XS29+T, MAX6423US29+T offers identical functionality in a slightly larger, thermally robust package, while NCP302LSN29T1G trades timeout adjustability for push-pull simplicity and marginally lower IQ-neither is pin-compatible, requiring layout revision.
Availability
MAX6423XS29+T is available at Aetrix Electronics and suitable for battery-powered medical sensors, automotive body control modules, and industrial programmable logic controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for MAX6423XS29+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 MAX6423XS29+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-constrained, energy-sensitive embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6423XS29+T?
The MAX6423XS29+T has a nominal reset threshold of 2.925V, with a guaranteed range of 2.852V (min) to 2.998V (max) over the full operating temperature range of –40°C to +125°C. This value is factory-laser-trimmed and specified per Table 1 in the datasheet, where suffix "29" denotes the 2.925V variant.
Does the MAX6423XS29+T require an external pullup resistor on the RESET pin?
Yes, the MAX6423XS29+T features an open-drain RESET output and requires an external pullup resistor (typically 10kΩ–100kΩ) to a logic rail between 0V and 5.5V. Without it, the RESET signal cannot transition high, preventing proper µP release from reset. The datasheet confirms this in the "Detailed Description" and "Pin Description" sections.
Can the MAX6423XS29+T operate reliably at VCC = 1.2V?
Yes, the MAX6423XS29+T is fully specified to operate and assert valid RESET down to VCC = 1.0V. At VCC = 1.2V, it maintains guaranteed reset threshold accuracy, 80µs propagation delay, and 1.6µA typical supply current-enabling robust brownout detection in ultra-low-voltage battery systems.
How is the reset timeout period calculated for the MAX6423XS29+T?
The reset timeout period tRP (in seconds) is calculated as tRP = 2.73 × 10⁶ × CSRT + 275µs, where CSRT is the external capacitor value in farads. For example, a 1500pF capacitor yields tRP ≈ 4.375ms (typical). This formula is explicitly given in the "Pin Description" and "Selecting a Reset Capacitor" sections of the datasheet.
Is the MAX6423XS29+T pin-compatible with other devices in the MAX642x family?
No, the MAX6423XS29+T is not pin-compatible with other MAX642x variants in different packages. It uses the 4-pin SC70-4 pinout (VCC, GND, RESET, SRT). Devices like MAX6424UK29+T (5-pin SOT23-5) or MAX6423US29+T (4-pin SOT143-4) share function but differ in pin count, order, and physical layout-requiring PCB redesign for substitution.
MAX6423XS29+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:
- 2.925V
- 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
MAX6423XS29+T FAQ
1.How can I place an order for MAX6423XS29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423XS29+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 MAX6423XS29+T reliable?
The price and inventory of MAX6423XS29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423XS29+T is usually 5 days.
3.What payment methods are accepted for MAX6423XS29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423XS29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423XS29+T?
MAX6423XS29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423XS29+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 MAX6423XS29+T?
For technical support, including MAX6423XS29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423XS29+T requirements.
6.How does Aetrix verify that MAX6423XS29+T is sourced from the original manufacturer or authorized distributors?
All MAX6423XS29+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 MAX6423XS29+T meets industry standards.
7.What is the process for return or replacement of MAX6423XS29+T?
All MAX6423XS29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423XS29+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 MAX6423XS29+T part is unused and in its original packaging.
Return procedure for MAX6423XS29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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