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Analog Devices Inc./Maxim Integrated MAX6423XS22-T
- Part No.:
- MAX6423XS22-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6423XS22-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:9,965
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Product details
Overview
MAX6423XS22-T from Maxim Integrated is a low-power microprocessor reset supervisor IC with open-drain active-low RESET output, 2.188V ±2.5% factory-trimmed reset threshold, and capacitor-adjustable reset timeout (275µs base + 2.73×10⁶·CSRT). It operates from 1.0V to 5.5V supply, draws 1.6µA typical quiescent current, and guarantees valid reset assertion down to VCC = 1V. Used in battery-powered controllers for reliable brownout detection and power-up sequencing.
For engineers reviewing the MAX6423XS22-T datasheet, MAX6423XS22-T pinout, MAX6423XS22-T application, or MAX6423XS22-T equivalent, key selection criteria include its SC70-4 open-drain output architecture, 2.188V threshold accuracy over -40°C to +125°C, capacitor-based timeout flexibility, guaranteed operation at VCC ≥ 1V, and immunity to sub-50µs VCC transients.
Technical Context
The MAX6423XS22-T implements a precision voltage monitor with laser-trimmed internal reference and hysteresis of 4×VTH (≈8.75mV). Its SRT pin sources a stable 240nA ramp current to charge an external capacitor; reset deassertion occurs when the capacitor voltage reaches 0.65V.
As an open-drain supervisor, it requires an external pullup resistor (10kΩ–100kΩ) to any logic supply up to 5.5V, enabling level-shifting and wired-OR reset bus configurations. It asserts RESET low on VCC drop below threshold and holds it low for the full timeout after VCC recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.188V ±2.5% (factory-trimmed suffix '22'); ensures precise brownout detection at nominal 2.188V across -40°C to +125°C |
| Quiescent Current | 1.6µA typical at +25°C; enables multi-year operation in coin-cell–powered systems |
| Supply Range | 1.0V to 5.5V; supports valid reset assertion even during deep brownout down to 1V VCC |
| Reset Timeout Base | 275µs minimum (CSRT = 0); provides guaranteed minimum hold time before release |
| VCC to Reset Delay | 80µs maximum (VCC falling at 1mV/µs); ensures fast response to supply collapse |
| Ramp Current (SRT) | 240nA ±20%; sets linear charging rate for external capacitor to determine timeout period |
| RESET Output Type | Active-low open-drain; allows flexible pullup to any voltage ≤5.5V and wired-OR with auxiliary reset sources |
Pinout & Package
MAX6423XS22-T is housed in a 4-pin SC70-4 package (outline 21-0098), measuring 2.0mm × 2.1mm × 0.95mm, with moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Primary return path for internal circuitry and SRT ramp current sink |
| 2 - VCC | Supply and threshold monitor input | Monitored voltage rail; reset asserted when VCC falls below 2.188V |
| 3 - SRT | Set Reset Timeout input | 240nA constant-current source pin; connects to capacitor-to-ground to set timeout period |
| 4 - RESET | Open-drain active-low reset output | Drives low during reset; requires external pullup; compatible with 0–5.5V logic supplies |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable timeout | Timeout programmable from 275µs to >100ms via external capacitor (tRP = 2.73×10⁶·CSRT + 275µs), enabling precise match to µP reset requirements |
| Open-drain RESET output | Supports level-shifting and wired-OR reset buses by allowing pullup to any voltage ≤5.5V, simplifying multi-rail system design |
| Valid operation down to VCC = 1V | Guarantees correct reset assertion and timing integrity even during severe brownout conditions, preventing spurious µP execution |
| Immunity to short VCC transients | Rejects negative-going glitches ≤50µs duration when VCC dips 100mV below threshold, eliminating false resets in noisy environments |
| Low leakage SRT node | 240nA ramp current source with minimal sensitivity to board leakage; requires short, clean trace routing to maintain timeout accuracy |
Applications
| Battery-Powered Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: A handheld medical glucose meter uses a coin-cell battery and must guarantee safe shutdown and restart during voltage sag. IC Role / Device Role / Timing Role: MAX6423XS22-T monitors the 3.3V LDO output, asserting open-drain RESET to the MCU when voltage drops below 2.188V, holding it low for 50ms after recovery. Use Value: Prevents corrupted memory writes and undefined MCU state during battery depletion, meeting IEC 60601 safety requirements. | Use Scenario: A 12V automotive body control unit powers a 5V microcontroller rail via DC/DC converter subject to load-dump transients. IC Role / Device Role / Timing Role: MAX6423XS22-T supervises the 5V rail, using its 50µs transient immunity to ignore brief sags while asserting RESET during sustained brownout. Use Value: Eliminates unintended MCU resets during door-lock actuation or window motor surges, improving system robustness per AEC-Q100 Grade 2. |
| Portable Industrial Sensors | Smart Energy Meters |
Use Scenario: A wireless temperature sensor node sleeps at 1.8V and wakes periodically; supply may dip near 1.6V during RF transmission. IC Role / Device Role / Timing Role: MAX6423XS22-T monitors the 1.8V supply, asserting RESET if VCC falls below 2.188V (ensuring early detection before critical undervoltage), with timeout set to 10ms. Use Value: Guarantees clean wake-from-sleep initialization and prevents firmware lockup due to marginal supply, extending field lifetime. | Use Scenario: A DIN-rail energy meter uses a wide-input buck converter feeding a 3.3V MCU rail; AC line interruptions cause rapid VCC decay. IC Role / Device Role / Timing Role: MAX6423XS22-T detects VCC collapse below 2.188V and holds RESET low for 100ms (via 33nF SRT cap) to ensure complete MCU shutdown before backup capacitor discharge. Use Value: Enables deterministic power-fail interrupt handling and EEPROM-safe shutdown per IEC 62056, avoiding data corruption during grid flicker. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6425UK22-T | Same 2.188V threshold and open-drain output, but in 5-pin SOT23-5 package with N.C. pin instead of SC70-4 pinout | Requires PCB layout change; supports same timeout and supply range but larger footprint | Select when SOT23-5 is preferred for assembly compatibility or thermal margin |
| TLV803EB22DBZR | 2.2V threshold, 1.6µA IQ, open-drain, but fixed 200ms timeout (no capacitor adjustment) and only rated to +105°C | Lacks timeout flexibility and automotive temperature range; suitable for cost-sensitive consumer designs | Choose only if fixed timeout suffices and extended temperature is not required |
Compared with MAX6423XS22-T, MAX6425UK22-T offers identical electrical behavior in a different package, while TLV803EB22DBZR trades timeout adjustability and temperature range for lower cost and simpler BOM-making MAX6423XS22-T optimal for space-constrained, high-reliability industrial applications requiring precise timing control.
Availability
MAX6423XS22-T is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, and portable industrial sensors requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX6423XS22-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
Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.
The MAX6421–MAX6426 family delivers ultra-low-power, capacitor-programmable reset supervisors optimized for space-constrained, battery-operated, and high-temperature embedded systems requiring deterministic power-monitoring behavior.
FAQ
What is the exact reset threshold voltage of the MAX6423XS22-T?
The MAX6423XS22-T has a factory-trimmed reset threshold of 2.188V with ±2.5% accuracy over the full -40°C to +125°C temperature range. This value is confirmed in Table 1 of the datasheet under suffix '22', and applies specifically to the MAX6423XS22-T variant-not the entire MAX6421–MAX6426 family.
Does the MAX6423XS22-T support operation below 1.6V supply?
Yes, the MAX6423XS22-T guarantees valid reset assertion down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Its internal circuitry remains functional and produces a defined RESET signal even at 1.0V, though output drive strength diminishes below 1.8V.
How do I calculate the reset timeout capacitor for the MAX6423XS22-T?
Use the formula CSRT = (tRP − 275µs) / 2.73×10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 50ms timeout requires CSRT = (0.05 − 0.000275) / 2.73×10⁶ ≈ 18.2nF. The MAX6423XS22-T datasheet specifies ceramic capacitors with <10nA leakage for best accuracy.
Can the MAX6423XS22-T RESET output drive a 5V logic input?
Yes-the MAX6423XS22-T features an open-drain RESET output rated for up to 5.5V, allowing connection of an external pullup resistor to a 5V rail. When asserted, RESET pulls low; when released, the pullup defines the high state. This enables direct interfacing with 5V µPs without level shifters.
Is the MAX6423XS22-T pin-compatible with other devices in the MAX642x family?
No-MAX6423XS22-T uses the 4-pin SC70-4 package with pinout GND-VCC-SRT-RESET. It is not pin-compatible with 5-pin SOT23 variants (e.g., MAX6425UK22-T) or push-pull-output versions (e.g., MAX6421XS22-T), which have different pin counts and assignments. Pin compatibility is explicitly stated only for designated variants in the datasheet's "Ordering Information" table.
MAX6423XS22-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.188V
- 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
MAX6423XS22-T FAQ
1.How can I place an order for MAX6423XS22-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423XS22-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 MAX6423XS22-T reliable?
The price and inventory of MAX6423XS22-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423XS22-T is usually 5 days.
3.What payment methods are accepted for MAX6423XS22-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423XS22-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423XS22-T?
MAX6423XS22-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423XS22-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 MAX6423XS22-T?
For technical support, including MAX6423XS22-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423XS22-T requirements.
6.How does Aetrix verify that MAX6423XS22-T is sourced from the original manufacturer or authorized distributors?
All MAX6423XS22-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 MAX6423XS22-T meets industry standards.
7.What is the process for return or replacement of MAX6423XS22-T?
All MAX6423XS22-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423XS22-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 MAX6423XS22-T part is unused and in its original packaging.
Return procedure for MAX6423XS22-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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