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Analog Devices Inc./Maxim Integrated MAX6420UK26+
- Part No.:
- MAX6420UK26+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK26+.pdf
- Description:
- IC MPU/RESET CIRC
- Quantity:
- Payment:
- Shipping:
Inventory:2,695
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Product details
Overview
The MAX6420UK26+ from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 2.625V fixed VCC reset threshold (±2.5% over temperature), an adjustable RESET IN input (1.26V threshold), and active-low open-drain RESET output. It asserts reset when either VCC or externally monitored voltage falls below its respective threshold, with capacitor-adjustable timeout (275µs to >5ms) and guaranteed operation down to VCC = 1V. It is used in automotive power management and battery-powered embedded controllers for reliable brownout detection.
For engineers reviewing the MAX6420UK26+ datasheet, MAX6420UK26+ pinout, MAX6420UK26+ application, or MAX6420UK26+ equivalent, this page delivers verified specifications including reset threshold accuracy, SRT capacitor timing equation, open-drain logic compatibility up to 5.5V, dual-supply monitoring capability, and AEC-Q100-qualified variants - all confirmed from Maxim's official datasheet Rev 11 (July 2019).
Technical Context
The MAX6420UK26+ implements dual-threshold supervision: a laser-trimmed 2.625V (±2.5%) comparator monitors VCC, while a high-impedance 1.26V comparator monitors external voltages via RESET IN using an external resistor divider. Reset assertion is triggered by VCC drop, RESET IN drop, or manual reset (via MR pin on compatible variants - not present on MAX6420).
Reset deassertion is controlled by a 240nA current source charging an external capacitor (CSRT) at SRT pin to a 0.65V internal reference; timeout is calculated as tRP = (2.71 × 10⁶) × CSRT + 275µs. The open-drain RESET output supports logic-level translation across supplies from 0V to 5.5V, enabling interoperability with diverse µP I/O domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 2.625V ±2.5% (–40°C to +125°C); ensures precise brownout detection for 2.8V/3.3V rails |
| Adjustable Input Threshold | 1.26V ±2.5%; enables monitoring of secondary supply (e.g., 1.8V, 2.5V) via external resistor divider |
| Reset Timeout Range | 275µs to >5.75ms (with CSRT = 0F to 1500pF); provides flexible µP reset hold time selection |
| Supply Current | 1.7µA (typ) at VCC ≤ 2.0V; enables multi-year battery life in portable systems |
| Operating Temperature | –40°C to +125°C; qualified for under-hood automotive and industrial environments |
| RESET Output Type | Active-low open-drain; allows wired-OR configuration and level-shifting up to 5.5V |
| Quiescent Supply Range | 1.0V to 5.5V; guarantees valid reset assertion even during deep brownout conditions |
Pinout & Package
SOT23-5 package (U5+2A outline, RoHS-compliant), 5-pin surface-mount, footprint per land pattern 90-0174. Thermal resistance θJA = 255.9°C/W (multi-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain reset output | Asserts low during fault; requires external pullup; compatible with 0–5.5V logic domains |
| 2 - GND | Ground reference | Return path for internal comparators and ramp current source; must be low-impedance |
| 3 - RESET IN | Adjustable threshold input | High-Z node (10nA leakage); connects to center tap of R1/R2 divider to set VMON_TH ≥ 1.26V |
| 4 - SRT | Reset timeout capacitor interface | 240nA precision current source; trace must be short and noise-isolated to avoid timing error |
| 5 - VCC | Supply and fixed-threshold input | Powers device and feeds 2.625V comparator; valid operation down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors primary rail (2.625V) and secondary rail (user-defined via resistor divider) |
| Capacitor-programmable timeout | Enables precise reset hold time tuning without firmware or external logic - critical for µP boot sequencing |
| Open-drain RESET output | Supports mixed-voltage systems (e.g., 1.8V µP with 3.3V bus) via external pullup to any supply ≤5.5V |
| Guaranteed operation to VCC = 1V | Ensures deterministic reset behavior during severe undervoltage - no undefined logic states |
| AEC-Q100 qualification | Available in /V automotive-grade variants (e.g., MAX6420UK26/V+T); validated for harsh-temperature cycling |
Applications
| Automotive Body Control Module | Medical Portable Infusion Pump |
|---|---|
Use Scenario: Monitors 2.8V microcontroller supply and 1.8V sensor interface rail in engine bay environment. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting open-drain RESET to µP and FPGA upon either rail dropout. Use Value: Prevents erratic MCU execution during cold-crank transients; timing margin ensured by 4.375ms timeout (CSRT = 1500pF). |
Use Scenario: Supervises 3.3V main controller and 2.5V analog front-end in battery-powered infusion device. IC Role / Device Role / Timing Role: Generates fail-safe reset signal when either supply dips below spec during motor activation. Use Value: Eliminates need for two discrete supervisors; 1.7µA quiescent current extends single-cell Li-ion runtime by >20%. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Ensures robust startup and brownout recovery for ARM Cortex-M4 core operating at 1.2V and 3.3V. IC Role / Device Role / Timing Role: Provides synchronized reset to µP and isolated communication ICs using shared open-drain bus. Use Value: Open-drain output enables direct connection to 5V RS-485 transceiver without level shifter. |
Use Scenario: Monitors backup supercapacitor (2.7V) and main 3.3V rail during grid outage transitions. IC Role / Device Role / Timing Role: Triggers secure shutdown and data retention sequence when either supply fails. Use Value: Factory-trimmed 2.625V threshold matches supercap end-of-life voltage; avoids premature shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK26+ | Same 2.625V fixed threshold and SOT23-5 package, but features active-low push-pull RESET (not open-drain) | Requires dedicated µP reset pin; cannot share reset bus with other open-drain devices | Select when µP reset input is CMOS-compatible and no bus-wiring flexibility is needed |
| TPS3808G33DBVR | Fixed 3.3V threshold only; no adjustable input; 350ms min timeout (non-adjustable); higher ICC (1.3µA vs 1.7µA typ) | Single-rail monitoring only; unsuitable for dual-supply systems requiring independent thresholds | Select only for simple 3.3V-only applications where dual monitoring is unnecessary |
Compared with MAX6418UK26+, the MAX6420UK26+ trades push-pull drive strength for open-drain flexibility and bus-sharing capability; compared with TPS3808G33DBVR, it adds critical dual-rail supervision and programmable timeout - making it uniquely suited for compact, multi-rail embedded designs.
Availability
MAX6420UK26+ is available at Aetrix Electronics and suitable for automotive body control modules, portable medical equipment, industrial PLC I/O modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK26+ 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 demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 family was engineered specifically for ultra-low-power, dual-rail microprocessor supervision in space-constrained, thermally harsh environments - emphasizing accuracy, flexibility, and AEC-Q100 compliance.
FAQ
What is the exact fixed reset threshold voltage of the MAX6420UK26+?
The MAX6420UK26+ has a factory-laser-trimmed fixed VCC reset threshold of 2.625V, with ±1.25% accuracy at +25°C and ±2.5% over the full –40°C to +125°C operating range. This value is confirmed in Table 1 (Suffix "26") and Electrical Characteristics section of the official datasheet Rev 11.
Does the MAX6420UK26+ include a manual reset (MR) input?
No, the MAX6420UK26+ does not include a manual reset (MR) input. Per the Selector Guide and Pin Description, only MAX6412/MAX6413/MAX6414 and MAX6418/MAX6419/MAX6420 feature dual-threshold supervision - but MR is present only on MAX6412–MAX6414. The MAX6420 uses RESET IN for adjustable monitoring and lacks MR functionality.
How do I calculate the reset timeout period for the MAX6420UK26+?
Use the formula tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is timeout in seconds and CSRT is capacitance in farads. For example, a 1500pF capacitor yields tRP ≈ 4.375ms. This equation is specified in the Pin Description and Application Information sections of the MAX6420UK26+ datasheet.
Can the MAX6420UK26+ monitor a 1.8V supply using its adjustable input?
Yes. With the 1.26V internal RESET IN threshold, a resistor divider (e.g., R1 = 470kΩ, R2 = 1MΩ) sets VMON_TH = 1.26V × (1MΩ + 470kΩ)/1MΩ ≈ 1.85V. This configuration is explicitly supported and illustrated in Figure 1 and Figure 4 of the MAX6420UK26+ datasheet.
Is the MAX6420UK26+ qualified for automotive applications?
The base MAX6420UK26+ is rated for –40°C to +125°C and meets AEC-Q100 stress test requirements; however, only variants with "/V" suffix (e.g., MAX6420UK26/V+T) are formally certified and marked as AEC-Q100 qualified. The +T denotes tape-and-reel packaging; /V denotes automotive qualification.
MAX6420UK26+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.625V, Adj
- 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-23-5
MAX6420UK26+ FAQ
1.How can I place an order for MAX6420UK26+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK26+ 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 MAX6420UK26+ reliable?
The price and inventory of MAX6420UK26+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK26+ is usually 5 days.
3.What payment methods are accepted for MAX6420UK26+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK26+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK26+?
MAX6420UK26+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK26+ 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 MAX6420UK26+?
For technical support, including MAX6420UK26+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK26+ requirements.
6.How does Aetrix verify that MAX6420UK26+ is sourced from the original manufacturer or authorized distributors?
All MAX6420UK26+ 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 MAX6420UK26+ meets industry standards.
7.What is the process for return or replacement of MAX6420UK26+?
All MAX6420UK26+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK26+, 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 MAX6420UK26+ part is unused and in its original packaging.
Return procedure for MAX6420UK26+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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