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Analog Devices Inc./Maxim Integrated MAX6423XS16+T
- Part No.:
- MAX6423XS16+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6423XS16+T.pdf
- Description:
- IC MPU/RESET CIRC 1.575V SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:2,138
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Product details
Overview
MAX6423XS16+T from Analog Devices is a low-power microprocessor supervisor IC with open-drain active-low reset output, 1.575V nominal reset threshold (±2.5% over temperature), 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 µP startup during brownout.
For engineers reviewing the MAX6423XS16+T datasheet, MAX6423XS16+T pinout, MAX6423XS16+T application, or MAX6423XS16+T 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 below 100mV overdrive.
Technical Context
The MAX6423XS16+T uses a laser-trimmed internal reference and 240nA SRT ramp current source to generate a precise, capacitor-set reset timeout period. Its reset assertion logic responds to VCC falling below 1.575V with 80µs propagation delay and maintains reset for the full timeout after VCC recovers.
As an open-drain device, it requires an external pullup resistor (10kΩ–100kΩ) to any supply up to 5.5V, enabling wired-OR reset capability and flexible logic-level interfacing. The SRT pin is sensitive to stray capacitance and leakage, requiring careful PCB layout to maintain timing accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V nominal (1.536V–1.614V at +25°C; ±2.5% over –40°C to +125°C) - sets minimum valid VCC before reset assertion |
| Quiescent Current | 1.6µA typical at VCC ≤ 2.0V - enables multi-year battery life in always-on monitoring applications |
| Reset Timeout Range | 275µs (CSRT = 0) to 5.75ms (CSRT = 1500pF) - adjustable via external capacitor for µP-specific reset hold requirements |
| VCC Operating Range | 1.0V to 5.5V - ensures reset validity even during deep brownout conditions |
| RESET Output Type | Active-low open-drain - supports wired-OR configuration and interface to µPs with different I/O voltage domains |
| VCC to RESET Delay | 80µs - deterministic response time to supply droop, critical for reliable power-up sequencing |
| Hysteresis | 4 × VTH (≈6.3mV) - prevents chatter near threshold during slow VCC transitions |
Pinout & Package
MAX6423XS16+T is housed in a 4-pin SC70-4 package (package code X4+1, outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, suitable for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input - connects to external capacitor to program reset hold time; 240nA precision ramp current source |
| 2 | GND | Ground reference - common return path for internal circuitry and external capacitor |
| 3 | RESET | Active-low open-drain reset output - requires external pullup; sinks ≥500µA at VCC ≥ 1.8V for robust µP reset assertion |
| 4 | VCC | Supply voltage and reset threshold monitor input - powers device and provides monitored rail; valid down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold duration (275µs–5.75ms) without firmware or external logic |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic µP reset behavior during deep undervoltage events where most supervisors fail |
| Immunity to short VCC transients | Rejects glitches ≤50µs wide and ≤100mV below threshold - eliminates false resets in noisy power environments |
| Open-drain RESET with 5.5V-tolerant output | Permits direct connection to µP reset inputs operating at voltages independent of VCC (e.g., 3.3V µP on 1.8V supply) |
| Low 1.6µA quiescent current | Minimizes battery drain in always-connected monitoring circuits - critical for >10-year coin-cell operation |
Applications
| Portable Medical Sensors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Wearable ECG patch with coin-cell battery and ultra-low-power MCU that must remain in deep sleep until valid supply is established. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-low RESET until VCC stabilizes above 1.575V and holds reset for ≥4ms to ensure complete MCU initialization. Use Value: Prevents corrupted memory writes or erratic sensor sampling during marginal battery discharge by enforcing strict power-good sequencing. |
Use Scenario: Remote RTU monitoring pipeline pressure using Li-SOCl₂ battery and ARM Cortex-M0+ MCU with tight power budget. IC Role / Device Role / Timing Role: Open-drain RESET output pulled to 3.3V rail, allowing auxiliary watchdog circuit to share same reset line via wired-OR. Use Value: Enables dual-source reset assertion (supervisor + external watchdog) without level-shifting components or additional GPIOs. |
| Automotive Body Control Modules | Smart Energy Metering Hardware |
Use Scenario: Door module powered from vehicle battery subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors 5V LDO output; asserts RESET within 80µs of VCC dip below 1.575V and sustains for 5ms to override MCU's internal POR. Use Value: Eliminates need for discrete RC-based reset circuits while meeting AEC-Q100 stress immunity requirements (shared family qualification). |
Use Scenario: Electricity meter with isolated µP and metrology ASIC, requiring clean reset during AC mains dropout. IC Role / Device Role / Timing Role: Supervises 3.3V supply derived from flyback converter; SRT capacitor set for 3.5ms timeout to accommodate slow power-rail recovery. Use Value: Guarantees µP remains held in reset until all analog front-end references settle, preventing measurement corruption during brownout recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6423US16+T | Same electrical specs and reset threshold, but in 4-pin SOT143-4 package (larger footprint, different thermal resistance) | Preferred when board layout accommodates larger SOT143 and requires higher power dissipation margin (320mW vs. 245mW) | Select MAX6423US16+T only if SC70-4 assembly capability is unavailable or thermal derating demands SOT143's higher dissipation. |
| NCP302LSN16T1G | Fixed 1.6V reset threshold, 1.2µA IQ, push-pull output, no capacitor-adjustable timeout (fixed 200ms) | Suitable for cost-sensitive applications where fixed long timeout suffices and open-drain flexibility is unnecessary | Choose NCP302LSN16T1G only when design does not require programmable timeout or wired-OR capability and prioritizes lowest BOM cost. |
Compared with MAX6423XS16+T, MAX6423US16+T offers identical supervision functionality in a larger, thermally robust package, while NCP302LSN16T1G trades timeout adjustability and open-drain versatility for lower cost and simpler implementation in non-critical timing applications.
Availability
MAX6423XS16+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6423XS16+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 MAX6421–MAX6426 family delivers ultra-low-power, precision voltage supervision for space- and energy-constrained µP systems, emphasizing capacitor-programmable timing, wide VCC range, and robust transient immunity.
FAQ
What is the exact reset threshold voltage tolerance for MAX6423XS16+T over temperature?
The MAX6423XS16+T has a nominal reset threshold of 1.575V, with ±2.5% tolerance over the full operating temperature range of –40°C to +125°C. At +25°C, the tolerance is tighter at ±1.5%, specified as 1.536V to 1.614V. This laser-trimmed accuracy ensures reliable brownout detection across automotive and industrial environments.
Can MAX6423XS16+T operate with a 1.2V supply rail?
No - the MAX6423XS16+T requires a minimum VCC of 1.0V to function, but its 1.575V reset threshold means it cannot supervise rails below that value. With a 1.2V supply, VCC never reaches the threshold, so no reset assertion occurs. It is designed to monitor rails ≥1.6V, such as 1.8V, 2.5V, 3.3V, or 5V systems.
How do I calculate the SRT capacitor value for a 4.0ms reset timeout with MAX6423XS16+T?
Use the formula CSRT = (tRP − 275µs) / 2.735 × 10⁶, where tRP is in seconds. For 4.0ms: CSRT = (0.004 − 0.000275) / 2,735,000 ≈ 1362pF. A standard 1300pF or 1500pF ceramic capacitor yields 3.9ms or 4.375ms timeout respectively - both within datasheet tolerance and suitable for most µP requirements.
Is MAX6423XS16+T pin-compatible with any industry-standard supervisors?
No - the MAX6423XS16+T uses a proprietary 4-pin SC70-4 pinout (VCC, GND, RESET, SRT) and is not pin-compatible with common alternatives like the TPS3808 or CAT811. Its SRT pin for capacitor-adjustable timeout is unique to this family. Board redesign is required when substituting from non-MAX642x devices.
Does MAX6423XS16+T support AEC-Q100 qualification?
The MAX6423XS16+T itself is not individually AEC-Q100 qualified; however, the MAX6340 variant in the same family (e.g., MAX6340UK31/V+T) carries AEC-Q100 Grade 2 qualification. For automotive applications requiring qualification, engineers should select the MAX6340 series or verify qualification status of specific variants directly with Analog Devices.
MAX6423XS16+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:
- 1.575V
- 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
MAX6423XS16+T FAQ
1.How can I place an order for MAX6423XS16+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423XS16+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 MAX6423XS16+T reliable?
The price and inventory of MAX6423XS16+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423XS16+T is usually 5 days.
3.What payment methods are accepted for MAX6423XS16+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423XS16+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423XS16+T?
MAX6423XS16+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423XS16+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 MAX6423XS16+T?
For technical support, including MAX6423XS16+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423XS16+T requirements.
6.How does Aetrix verify that MAX6423XS16+T is sourced from the original manufacturer or authorized distributors?
All MAX6423XS16+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 MAX6423XS16+T meets industry standards.
7.What is the process for return or replacement of MAX6423XS16+T?
All MAX6423XS16+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423XS16+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 MAX6423XS16+T part is unused and in its original packaging.
Return procedure for MAX6423XS16+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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