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Analog Devices Inc./Maxim Integrated MAX6423US22-T
- Part No.:
- MAX6423US22-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- TO-253-4, TO-253AA
- Datasheet:
-
MAX6423US22-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT143-4
- Quantity:
- Payment:
- Shipping:
Inventory:20,000
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Product details
Overview
MAX6423US22-T from Maxim Integrated is a low-power microprocessor reset supervisor IC in SOT143-4 package, featuring an active-low open-drain RESET output, 2.188V ±2.5% factory-trimmed reset threshold, and capacitor-adjustable reset timeout (275µs base + 2.73×10⁶ × CSRT). It monitors VCC from 1.6V to 5V and guarantees valid reset assertion down to VCC = 1V, used in battery-powered controllers and embedded systems requiring precise brownout protection.
For engineers reviewing the MAX6423US22-T datasheet, MAX6423US22-T pinout, MAX6423US22-T application, or MAX6423US22-T equivalent, key selection criteria include its open-drain output compatibility with mixed-voltage µP interfaces, 1.6µA typical quiescent current, -40°C to +125°C operating range, and SRT pin's 240nA ramp current for accurate timeout setting via external capacitor.
Technical Context
The MAX6423US22-T implements a precision voltage comparator with 2.188V laser-trimmed threshold and 4.375mV hysteresis, referenced to an internal bandgap. Its reset timeout is generated by charging an external capacitor (CSRT) at 240nA until reaching 0.65V - a ramp-based timing architecture independent of supply voltage variation.
As an open-drain supervisor, it requires an external pullup resistor (10kΩ–100kΩ) to any logic supply up to 5.5V, enabling wired-OR reset configurations and level-shifting across disparate voltage domains - a capability absent in push-pull variants like MAX6421US22-T.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.188V ±2.5% (factory-trimmed; ensures reliable detection of 2.2V system rail brownout) |
| Quiescent Current | 1.6µA typ (enables multi-year operation on coin-cell batteries in portable equipment) |
| Reset Timeout Base | 275µs minimum (guaranteed minimum assertion time before capacitor scaling begins) |
| SRT Ramp Current | 240nA (sets timeout slope: tRP = 2.73×10⁶ × CSRT + 275µs; enables ms-range adjustability) |
| VCC Operating Range | 1.0V to 5.5V (valid reset operation down to 1V supports ultra-low-power wake-up sequencing) |
| Output Type | Active-low open-drain (allows shared reset bus with auxiliary circuitry and flexible logic-level interfacing) |
| Temperature Range | -40°C to +125°C (qualified for automotive and industrial underhood/enclosure environments) |
Pinout & Package
MAX6423US22-T is housed in a 4-pin SOT143-4 package (1.3mm × 2.1mm, 0.95mm height), with gull-wing leads and exposed pad not electrically connected. Pin 3 is internally unconnected (N.C.) and may be tied to GND for mechanical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VCC | Supply & threshold monitor input | Monitors system rail; reset asserts when VCC falls below 2.188V; valid down to 1.0V |
| 2 - GND | Ground reference | Return path for internal comparator and SRT current source; must be low-impedance |
| 3 - N.C. | No internal connection | Not bonded; may be grounded for PCB mechanical reinforcement but carries no signal |
| 4 - RESET | Active-low open-drain output | Sinks current when asserted; requires external pullup (10kΩ–100kΩ) to target logic supply |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable timeout | Enables precise reset hold time tuning (e.g., 100ms for slow µP power-up) without firmware or BOM changes |
| Open-drain RESET output | Supports wired-OR reset buses and level translation - e.g., driving 3.3V µP reset from 1.8V domain |
| Guaranteed operation to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing undefined µP states |
| Immunity to short VCC transients | Rejects ≤50µs glitches 100mV below threshold - eliminates false resets from switching noise |
| Low leakage SRT pin | 240nA ramp current minimizes sensitivity to PCB leakage, enabling stable timeout with 1nF ceramic capacitors |
Applications
| Battery-Powered Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: A handheld medical glucose meter powered by CR2032 coin cell must retain configuration memory and avoid erratic boot during battery voltage sag. IC Role / Device Role / Timing Role: MAX6423US22-T monitors the 2.2V regulated rail and holds µP in reset until voltage stabilizes post-brownout, using 1500pF SRT capacitor for 4.375ms timeout. Use Value: Prevents corrupted EEPROM writes and invalid sensor initialization during marginal battery conditions. | Use Scenario: A door module MCU experiences load-dump transients and cold-crank voltage dips below 6V. IC Role / Device Role / Timing Role: MAX6423US22-T provides robust reset supervision with 2.188V threshold and transient immunity, asserting reset for ≥4ms after VCC recovers. Use Value: Eliminates MCU lockup during engine start, meeting ISO 16750-2 pulse 4a/b requirements. |
| Industrial Sensor Nodes | Set-Top Box Power Sequencing |
Use Scenario: A wireless temperature node sleeps at 1.8V, wakes periodically, and must reboot cleanly if supply drops during RF transmission. IC Role / Device Role / Timing Role: MAX6423US22-T detects sub-2.188V events on the 2.2V LDO output and asserts open-drain RESET to the ARM Cortex-M0+. Use Value: Ensures deterministic restart without firmware intervention, reducing field failure rate by >99% vs. RC-reset circuits. | Use Scenario: A dual-rail STB uses 1.2V core and 3.3V I/O; µP must initialize only after both rails are stable. IC Role / Device Role / Timing Role: MAX6423US22-T supervises the 3.3V rail and pulls shared reset bus low; external 3.3V pullup enables coordination with core-rail supervisor. Use Value: Enables synchronized power-up across voltage domains using single-wire wired-OR topology. |
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 reset threshold (2.188V), open-drain output, but in 5-pin SOT23-5 package with dedicated SRT pin (no N.C. pin) | Requires PCB layout change due to 5-pin footprint and different pinout; better suited for new designs with space for larger package | Select MAX6425UK22-T only when SOT23-5 is preferred and board redesign is acceptable |
| NCP302HS22T1G | 2.2V threshold, open-drain, 1.5µA IQ, but fixed 200ms timeout (no capacitor adjustment); SOT23-3 package | Lacks adjustable timeout - unsuitable where µP-specific hold time is required (e.g., FPGA configuration) | Choose NCP302HS22T1G only for cost-sensitive, fixed-timing applications with no timeout tuning need |
Compared with MAX6423US22-T, MAX6425UK22-T offers identical electrical behavior but demands layout revision, while NCP302HS22T1G sacrifices timeout flexibility for lower cost and smaller footprint - neither is pin-compatible, and both require validation of timing and interface compatibility.
Availability
MAX6423US22-T is available at Aetrix Electronics and suitable for battery-powered controllers, automotive body electronics, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6423US22-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX6421–MAX6426 family was designed specifically for ultra-low-power microprocessor reset supervision in space-constrained, battery-operated, and harsh-environment systems - emphasizing accuracy, transient immunity, and flexible timeout control.
FAQ
What is the exact reset threshold voltage of the MAX6423US22-T?
The MAX6423US22-T has a factory-laser-trimmed reset threshold of 2.188V, with ±2.5% tolerance over the full -40°C to +125°C temperature range. This value is confirmed in Table 1 of the datasheet (suffix "22") and verified in the Electrical Characteristics table under VTH parameter. The MAX6423US22-T maintains this accuracy without external calibration.
Does the MAX6423US22-T require an external pullup resistor on the RESET pin?
Yes, the MAX6423US22-T features an active-low open-drain RESET output and requires an external pullup resistor (typically 10kΩ to 100kΩ) to a logic supply between 0V and 5.5V. This enables level-shifting and wired-OR functionality. Without the pullup, RESET remains floating and cannot drive a valid logic high, making the MAX6423US22-T nonfunctional in most µP interface scenarios.
How is the reset timeout period calculated for the MAX6423US22-T?
The reset timeout period tRP for the MAX6423US22-T is calculated as tRP = (2.73 × 10⁶) × CSRT + 275µs, where CSRT is the capacitor value in farads connected between SRT and GND. For example, a 1500pF capacitor yields tRP ≈ 4.375ms. This formula is derived from the 240nA internal ramp current and 0.65V trip threshold, and is validated in the Typical Operating Characteristics graphs.
Can the MAX6423US22-T operate reliably at VCC = 1.2V?
Yes, the MAX6423US22-T guarantees valid reset assertion and deassertion down to VCC = 1.0V, per the Absolute Maximum Ratings and Electrical Characteristics tables. At 1.2V, the device fully meets all specifications including reset threshold accuracy, timeout stability, and output sink capability (VOL ≤ 0.3V at ISINK = 50µA). This makes the MAX6423US22-T suitable for ultra-low-voltage energy-harvesting systems.
Is the NC pin (Pin 3) on the MAX6423US22-T safe to connect to ground?
Yes, Pin 3 of the MAX6423US22-T is explicitly designated as "Not Internally Connected" (N.C.) in the Pin Description table, and the datasheet states it "can be connected to GND." Doing so improves mechanical stability on the PCB without affecting electrical performance, thermal behavior, or reliability of the MAX6423US22-T. No current flows through this pin under any operating condition.
MAX6423US22-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- TO-253-4, TO-253AA
- 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:
- SOT-23-4
MAX6423US22-T FAQ
1.How can I place an order for MAX6423US22-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6423US22-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 MAX6423US22-T reliable?
The price and inventory of MAX6423US22-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6423US22-T is usually 5 days.
3.What payment methods are accepted for MAX6423US22-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6423US22-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6423US22-T?
MAX6423US22-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6423US22-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 MAX6423US22-T?
For technical support, including MAX6423US22-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6423US22-T requirements.
6.How does Aetrix verify that MAX6423US22-T is sourced from the original manufacturer or authorized distributors?
All MAX6423US22-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 MAX6423US22-T meets industry standards.
7.What is the process for return or replacement of MAX6423US22-T?
All MAX6423US22-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6423US22-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 MAX6423US22-T part is unused and in its original packaging.
Return procedure for MAX6423US22-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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