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Analog Devices Inc./Maxim Integrated MAX6420UK22+
- Part No.:
- MAX6420UK22+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK22+.pdf
- Description:
- MAX6420 LOW-POWER, DUAL-VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:6,776
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Product details
Overview
MAX6420UK22+ from Maxim Integrated is a low-power, dual-voltage microprocessor reset supervisor IC with one factory-trimmed VCC reset threshold (2.188V typical) and one adjustable RESET IN input for monitoring secondary voltages down to 1.26V. It features an active-low open-drain RESET output, capacitor-adjustable reset timeout delay (275µs base + 2.71×10⁶ × CSRT), and operates across -40°C to +125°C. It is used in automotive and industrial embedded controllers requiring reliable brownout detection and dual-rail supervision.
For engineers reviewing the MAX6420UK22+ datasheet, MAX6420UK22+ pinout, MAX6420UK22+ application, or MAX6420UK22+ equivalent, key selection criteria include its dual-threshold architecture, 1.7µA quiescent current, guaranteed RESET validity down to VCC = 1V, SOT23-5 package compatibility, and open-drain output enabling flexible logic-level interfacing with µPs powered by 3.3V or 5V rails.
Technical Context
The MAX6420UK22+ integrates two independent reset comparators: one laser-trimmed for VCC monitoring at 2.188V (±2.5% over temperature), and a second high-impedance adjustable input (RESET IN) referenced to 1.26V, allowing external resistor-divider configuration for secondary voltage thresholds. Reset assertion occurs if either VCC or RESET IN falls below its respective threshold, or if manual reset is triggered via external circuitry.
Its reset timeout is generated by a precision 240nA internal current source charging an external capacitor (CSRT) to a 0.65V internal reference; deassertion occurs once the ramp reaches that level. The open-drain RESET output supports pull-up to any voltage ≤5.5V, enabling interoperability across mixed-supply systems without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.188V (typ), ±2.5% over -40°C to +125°C - ensures accurate brownout detection for 2.2V nominal rails |
| RESET IN Threshold | 1.26V (fixed internal reference) - enables precise external voltage monitoring via resistor divider |
| Quiescent Current | 1.7µA (typ) at +25°C - supports ultra-low-power battery-backed and always-on applications |
| Reset Timeout Base Delay | 275µs minimum - sets shortest possible reset hold time before external capacitor scaling |
| Supply Voltage Range | 1.0V to 5.5V - guarantees functional reset assertion even during deep brownout conditions |
| Output Type | Active-low open-drain - allows wired-OR configuration and interface to µP reset inputs powered by different supplies |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
Pinout & Package
SOT23-5 package: compact, surface-mount, lead-free (RoHS-compliant), thermal pad not present, footprint compatible with industry-standard 5-pin SOT23 land pattern (Maxim land pattern no. 90-0174).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain reset output | Active-low signal asserted during fault; requires external pull-up; sinks up to 50µA at VCC ≥1V |
| 2 - GND | Ground reference | Primary return path for internal comparators and current source; must be low-impedance |
| 3 - RESET IN | Adjustable voltage monitor input | High-impedance node (leakage <10nA); connects to center tap of external resistor divider for secondary rail monitoring |
| 4 - MR (not connected internally) | Manual reset input terminal | No internal connection per MAX6420 datasheet; unused - differs from MAX6412–MAX6414 family members |
| 5 - SRT | Reset timeout capacitor connection | 240nA precision current source node; trace must be short and isolated to avoid leakage/capacitance errors |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors VCC (2.188V fixed) and secondary rail (via RESET IN + external divider), eliminating need for two discrete supervisors |
| Capacitor-adjustable timeout | Timeout programmable from ~275µs to >100ms using standard ceramic capacitor (CSRT), supporting diverse µP reset timing requirements |
| Open-drain RESET output | Enables direct interface to µP reset pins powered by 1.8V, 3.3V, or 5V supplies without level shifters or additional logic |
| Ultra-low supply current | 1.7µA typical ICC allows integration into energy-sensitive applications such as automotive telematics and portable medical devices |
| Guaranteed operation down to VCC = 1V | Ensures valid reset signaling during severe brownout events where many supervisors cease functioning |
Applications
| Automotive Powertrain Control | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervising both 5V microcontroller supply and 3.3V sensor interface rail in engine control units subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting reset if either rail drops below specification, with timeout set to exceed µP power-up stabilization time. Use Value: Prevents erratic ECU behavior during voltage sags by ensuring deterministic reset sequencing across two critical domains. | Use Scenario: Monitoring 24V field power converted to 5V logic rail and 3.3V FPGA core voltage in modular automation hardware. IC Role / Device Role / Timing Role: Provides synchronized reset assertion across dual supplies using single IC, reducing BOM count and PCB area vs. discrete solutions. Use Value: Eliminates risk of partial initialization due to mismatched reset timing between logic and programmable logic domains. |
| Battery-Powered Medical Monitor | Set-Top Box Power Management |
Use Scenario: Ensuring safe startup and brownout recovery in portable ECG device powered by Li-ion battery (2.7–4.2V range) with dual-rail analog front-end and digital processor. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and auxiliary 1.8V ADC reference rail; open-drain output interfaces directly to both µP and FPGA reset inputs. Use Value: Maintains regulatory compliance for fail-safe operation while minimizing standby current drain (<2µA). | Use Scenario: Coordinating reset of main SoC (3.3V) and HDMI PHY (1.8V) in consumer entertainment equipment with strict power sequencing requirements. IC Role / Device Role / Timing Role: Generates unified reset pulse with user-defined duration, triggered by either supply droop or external watchdog timeout signal. Use Value: Avoids video corruption or firmware lockup caused by asynchronous power rail collapse during AC brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6418UK22+ | Same dual-threshold architecture and SOT23-5 package, but features active-low push-pull RESET output instead of open-drain | Requires dedicated reset rail; cannot share pull-up with other devices or interface to mixed-voltage µPs | Select when system uses single-supply µP and board layout favors push-pull drive without external pull-up |
| TPS3808G125DBVR | TI part with fixed 1.25V threshold only; no adjustable input; offers 200ms fixed timeout and higher ICC (12µA) | Lacks dual-voltage capability; suitable only for single-rail monitoring; no RESET IN flexibility | Select only for cost-sensitive single-supply applications where adjustable secondary monitoring is unnecessary |
Compared with MAX6418UK22+, the MAX6420UK22+ trades push-pull drive for open-drain versatility-critical for multi-supply systems-while retaining identical threshold accuracy and temperature range; versus TPS3808G125DBVR, it provides true dual-rail supervision and 7× lower quiescent current, justifying use where power efficiency and design flexibility are prioritized.
Availability
MAX6420UK22+ is available at Aetrix Electronics and suitable for automotive powertrain control, industrial PLC I/O modules, battery-powered medical monitors, and set-top box power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6420UK22+ 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, mixed-signal, and power-management ICs for demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 product line delivers configurable, ultra-low-power reset supervision for systems requiring dual-voltage monitoring, capacitor-tunable timing, and operation across harsh environmental conditions.
FAQ
What is the exact VCC reset threshold voltage for MAX6420UK22+?
The MAX6420UK22+ has a factory-trimmed VCC reset threshold of 2.188V (typical), with ±2.5% tolerance over the full -40°C to +125°C operating temperature range. This value corresponds to the "22" suffix in the part number per Maxim's Reset Voltages Suffix Table. The threshold is laser-trimmed and does not require external calibration.
Does MAX6420UK22+ include a manual reset (MR) input?
No, the MAX6420UK22+ does not feature a functional manual reset input. Unlike MAX6412–MAX6414 variants, the MR pin (Pin 4) is unconnected internally per the official datasheet Selector Guide and Pin Description table. Manual reset functionality must be implemented externally-for example, by shorting the RESET IN node to ground via a switch in parallel with R2 per Figure 2 of the datasheet.
How is the reset timeout period calculated for MAX6420UK22+?
The reset timeout period tRP for MAX6420UK22+ is calculated as tRP = (2.71 × 10⁶) × CSRT + 275µs, where tRP is in seconds and CSRT is the capacitor value in farads. For example, a 1500pF capacitor yields ~4.375ms timeout. The internal 240nA current source charges CSRT to a 0.65V reference; low-leakage ceramic capacitors are required for accuracy.
What is the function of the RESET IN pin on MAX6420UK22+?
The RESET IN pin on MAX6420UK22+ is a high-impedance input (leakage <10nA) connected to an internal 1.26V comparator reference. It enables monitoring of a secondary voltage rail (e.g., 3.3V or 1.8V) using an external resistor divider. The monitored threshold VMON_TH is calculated as VMON_TH = 1.26V × (R1 + R2)/R2, allowing precise, adjustable supervision beyond the fixed VCC threshold.
Can MAX6420UK22+ operate reliably below 1.8V supply voltage?
Yes, MAX6420UK22+ is fully specified from VCC = 1.0V to 5.5V and guarantees valid RESET output behavior down to VCC = 1V. Its internal comparators and bias circuitry remain functional at sub-1.8V levels, making it suitable for brownout detection in Li-ion battery-powered systems where voltage may sag to 2.5V or lower during peak load.
MAX6420UK22+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.188V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 3ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6420UK22+ FAQ
1.How can I place an order for MAX6420UK22+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK22+ 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 MAX6420UK22+ reliable?
The price and inventory of MAX6420UK22+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK22+ is usually 5 days.
3.What payment methods are accepted for MAX6420UK22+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK22+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK22+?
MAX6420UK22+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK22+ 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 MAX6420UK22+?
For technical support, including MAX6420UK22+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK22+ requirements.
6.How does Aetrix verify that MAX6420UK22+ is sourced from the original manufacturer or authorized distributors?
All MAX6420UK22+ 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 MAX6420UK22+ meets industry standards.
7.What is the process for return or replacement of MAX6420UK22+?
All MAX6420UK22+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK22+, 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 MAX6420UK22+ part is unused and in its original packaging.
Return procedure for MAX6420UK22+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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