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Analog Devices Inc./Maxim Integrated MAX6420UK46+
- Part No.:
- MAX6420UK46+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK46+.pdf
- Description:
- IC MPU/RESET CIRC 4.625V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,073
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Product details
Overview
MAX6420UK46+ from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC in SOT23-5 package, featuring a factory-trimmed 4.625V fixed VCC reset threshold and an adjustable RESET IN input (1.26V reference) for monitoring secondary voltages down to 1.26V. It delivers active-low open-drain RESET output, capacitor-adjustable reset timeout (275µs to >5ms), and guaranteed valid reset operation down to VCC = 1V. It is used in automotive ECUs to monitor both main supply and auxiliary rail integrity during cold-crank or load-dump events.
For engineers reviewing the MAX6420UK46+ datasheet, MAX6420UK46+ pinout, MAX6420UK46+ application, or MAX6420UK46+ equivalent, key selection considerations include its dual-threshold architecture, open-drain logic compatibility with mixed-supply µPs, AEC-Q100 qualification (indicated by /V suffix variants), and precise 2.5% threshold accuracy over -40°C to +125°C.
Technical Context
The MAX6420UK46+ integrates two independent voltage-monitoring comparators: one laser-trimmed for VCC at 4.625V ±2.5%, and another referenced to a stable 1.26V internal bandgap for externally scaled RESET IN thresholds. Its reset assertion logic combines OR behavior - reset triggers if either VCC falls below 4.625V or RESET IN falls below its programmed value.
Reset deassertion uses a precision 240nA current source charging an external capacitor on SRT; the timeout period is determined by the time required for the ramp voltage to reach 0.65V, enabling accurate, temperature-stable delays from sub-millisecond to multi-millisecond ranges without trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fixed VCC Threshold | 4.625V ±2.5% - ensures reliable power-up reset for 5V systems with brownout immunity down to ~4.5V. |
| Adjustable RESET IN Reference | 1.26V ±33mV hysteresis - enables monitoring of any secondary voltage (e.g., 3.3V, 2.5V, 1.8V rails) via resistor divider. |
| Reset Timeout Range | 275µs to >5ms - set externally via capacitor on SRT pin; supports µP reset timing requirements from fast boot to slow peripherals. |
| Supply Current | 1.7µA (typ) at VCC ≤ 2.0V - minimizes battery drain in always-on automotive or portable applications. |
| Output Type | Active-low open-drain - allows wired-OR configuration, level-shifting, and compatibility with µPs requiring pull-up to different supply rails. |
| Operating Temp | -40°C to +125°C - fully specified for under-hood automotive environments and industrial embedded control. |
| Package | SOT23-5 - compact 2.9mm × 1.6mm footprint with thermal resistance θJA = 255.9°C/W (multi-layer board). |
Pinout & Package
SOT23-5 package: 5-pin surface-mount, lead-free (+), RoHS-compliant, thermal pad not present. Pin 1 marked by dot; top view orientation per Maxim outline 21-0057.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain output | Drives low during reset; requires external pull-up to define logic-high level (e.g., 3.3V or 5V); supports multi-drop bus configurations. |
| 2 - GND | Ground reference | Primary return path for all internal circuitry and comparator references; must be low-impedance connection to system ground plane. |
| 3 - RESET IN | Adjustable threshold input | High-impedance node (10nA leakage) connected to center tap of resistor divider; sets secondary voltage trip point using VMON_TH = 1.26V × (R1+R2)/R2. |
| 4 - SRT | Reset timeout capacitor interface | 240nA precision current source charges external CSRT; layout-sensitive node - keep trace short, away from noise sources to avoid timeout error. |
| 5 - VCC | Main supply and fixed-threshold monitor input | Powers device and feeds primary comparator; valid reset assertion guaranteed down to VCC = 1V; absolute max rating +6.0V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises main supply (4.625V) and configurable auxiliary rail (e.g., 3.3V or 1.8V), eliminating need for two discrete supervisors. |
| Capacitor-programmable reset timeout | Enables precise, production-tolerant delay tuning without trimming resistors or firmware changes - critical for meeting ISO 16750-2 cold-crank timing. |
| AEC-Q100 qualified variants available | Parts with /V suffix (e.g., MAX6420UK46/V+) meet automotive stress testing requirements for temperature cycling, ESD, and HTOL. |
| Open-drain RESET with wide voltage tolerance | RESET pin withstands up to +6.0V - allows direct interface to µP I/Os operating at 1.2V–5.5V without level translators. |
| Guaranteed reset validity at low VCC | Ensures deterministic reset state even as battery sags to 1.0V - prevents erratic µP behavior during deep brownout conditions. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V image sensor rail during vehicle start-stop cycles and load-dump transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting reset if either rail drops below specification, with 4.375ms timeout ensuring full FPGA initialization before CAN communication begins. Use Value: Prevents corrupted sensor data capture and CAN bus arbitration errors caused by partial µP boot due to undervoltage on auxiliary rail. | Use Scenario: Ensures clean power-up sequencing for 1.8V ISP core and 2.8V CMOS image sensor in automotive-grade camera. IC Role / Device Role / Timing Role: Uses RESET IN divider to set 1.75V trip on 1.8V rail and fixed 4.625V threshold on 5V bias supply; open-drain output pulled to 1.8V for direct µP reset pin interface. Use Value: Eliminates need for discrete voltage detectors and level shifters, reducing BOM count and PCB area in space-constrained modules. |
| Medical Infusion Pump Controller | Industrial PLC I/O Module |
Use Scenario: Supervises backup coin-cell supply (3.0V) and main 24V-to-5V DC/DC output in safety-critical drug delivery system. IC Role / Device Role / Timing Role: Configures RESET IN to monitor 3.0V backup rail while fixed threshold guards 5V logic supply; timeout set to 5.75ms to cover worst-case µC boot with EEPROM initialization. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing fail-safe reset assertion during dual-rail failure. | Use Scenario: Provides robust reset supervision for ARM Cortex-M7 µP and isolated RS-485 transceivers powered from separate 3.3V and 5V rails. IC Role / Device Role / Timing Role: Fixed 4.625V threshold monitors 5V transceiver supply; RESET IN configured for 3.2V trip on µP rail; open-drain output shared across multiple reset domains via pull-up to local 3.3V. Use Value: Enables single-point reset coordination across heterogeneous voltage domains without cross-domain coupling or timing skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | Fixed 3.3V threshold only; no adjustable input; push-pull output; 35µA quiescent current. | Single-rail monitoring only; unsuitable for dual-voltage systems requiring independent trip points. | Select only when supervising one supply rail and lower cost outweighs dual-monitoring capability. |
| ADM6315-46DARTZ-RL | Fixed 4.63V threshold; no adjustable input; open-drain output; 1.6µA IQ; -40°C to +105°C range. | Lacks secondary voltage monitoring; limited temperature range excludes under-hood automotive use. | Consider for industrial non-automotive applications where dual-rail supervision is unnecessary and extended temp is not required. |
Compared with TPS3808G33DBVR and ADM6315-46DARTZ-RL, the MAX6420UK46+ uniquely supports true dual-voltage supervision in a single SOT23-5 package with automotive-grade temperature range and ultra-low 1.7µA supply current - making it the only option that satisfies simultaneous 5V main rail and configurable auxiliary rail monitoring in AEC-Q100 environments.
Availability
MAX6420UK46+ is available at Aetrix Electronics and suitable for automotive electronics, medical infusion pumps, and industrial PLC modules requiring stable component supply with long-term lifecycle assurance and AEC-Q100-compliant sourcing.
Supply support for MAX6420UK46+ 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 family was engineered specifically for high-reliability microprocessor supervision in harsh environments, emphasizing ultra-low power, dual-rail monitoring flexibility, and guaranteed reset behavior across extreme temperature and voltage transients.
FAQ
What is the exact fixed reset threshold voltage of the MAX6420UK46+?
The MAX6420UK46+ has a factory-laser-trimmed fixed VCC reset threshold of 4.625V, with guaranteed accuracy of ±2.5% over the full -40°C to +125°C operating temperature range. This value corresponds to the "46" suffix in the part number per Maxim's Reset Voltages Suffix Table, and is confirmed in the Electrical Characteristics table under VTH parameter.
Does the MAX6420UK46+ support monitoring a 3.3V auxiliary rail?
Yes, the MAX6420UK46+ supports monitoring a 3.3V auxiliary rail via its RESET IN pin. Using a resistor divider referenced to the internal 1.26V comparator threshold, a 3.3V rail can be scaled to trip at precisely 3.3V - for example, with R1 = 1.62MΩ and R2 = 1MΩ, yielding VMON_TH = 1.26V × (1.62M + 1M)/1M = 3.30V. The MAX6420UK46+ datasheet provides the exact formula and design guidance.
What is the minimum external capacitor value needed for a 4.375ms reset timeout on the MAX6420UK46+?
For a 4.375ms reset timeout, the required SRT capacitor is 1500pF, as explicitly listed in the MAX6420UK46+ Electrical Characteristics table under "Reset Timeout Period" with condition CSRT = 1500pF. The general formula tRP = (2.71 × 10⁶) × CSRT + 275µs confirms this: solving for CSRT gives (4.375ms − 0.275ms) / 2.71M ≈ 1500pF. Ceramic capacitors with <10nA leakage are recommended.
Is the MAX6420UK46+ pin-compatible with other parts in the MAX6412–MAX6420 family?
Yes, all MAX6412–MAX6420 devices, including the MAX6420UK46+, share identical SOT23-5 pinout and footprint (outline 21-0057). Pin functions - RESET, GND, RESET IN, SRT, VCC - are consistent across the family. However, output type (push-pull vs. open-drain) and feature set (manual reset, adjustable input) differ by part number, so electrical compatibility must be verified per application.
How does the MAX6420UK46+ handle negative-going VCC transients?
The MAX6420UK46+ exhibits strong immunity to short-duration negative-going VCC transients. Per the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", a 100mV transient below the 4.625V threshold (i.e., to 4.525V) lasting ≤50µs will typically not trigger a false reset - a key requirement for automotive ISO 16750-2 compliance. This immunity stems from internal filtering and comparator hysteresis.
MAX6420UK46+ 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:
- 4.625V, 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
MAX6420UK46+ FAQ
1.How can I place an order for MAX6420UK46+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK46+ 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 MAX6420UK46+ reliable?
The price and inventory of MAX6420UK46+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK46+ is usually 5 days.
3.What payment methods are accepted for MAX6420UK46+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK46+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK46+?
MAX6420UK46+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK46+ 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 MAX6420UK46+?
For technical support, including MAX6420UK46+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK46+ requirements.
6.How does Aetrix verify that MAX6420UK46+ is sourced from the original manufacturer or authorized distributors?
All MAX6420UK46+ 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 MAX6420UK46+ meets industry standards.
7.What is the process for return or replacement of MAX6420UK46+?
All MAX6420UK46+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK46+, 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 MAX6420UK46+ part is unused and in its original packaging.
Return procedure for MAX6420UK46+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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