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Analog Devices Inc./Maxim Integrated MAX6420UK23-T
- Part No.:
- MAX6420UK23-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6420UK23-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
MAX6420UK23-T from Maxim Integrated is a low-power, dual-voltage microprocessor reset supervisor IC with one factory-trimmed VCC reset threshold (2.313V 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 medical systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6420UK23-T datasheet, MAX6420UK23-T pinout, MAX6420UK23-T application, or MAX6420UK23-T equivalent, key selection criteria include its dual-threshold architecture, 1.7µA quiescent current, guaranteed RESET validity down to VCC = 1V, open-drain output compatibility with mixed-supply µPs, and SOT23-5 package suitability for space-constrained embedded designs.
Technical Context
The MAX6420UK23-T integrates two independent reset comparators: one laser-trimmed for VCC at 2.313V (±2.5% over temperature), and one adjustable comparator referenced to 1.26V on RESET IN, enabling dual-rail voltage monitoring (e.g., 3.3V core + 1.8V I/O). Reset assertion occurs if either voltage falls below its threshold or MR is pulled low.
Its reset timeout is generated by a precision 240nA current source charging an external capacitor (SRT-to-GND), with deassertion triggered when the ramp reaches 0.65V. The open-drain RESET output supports pull-up to any voltage ≤6.0V, enabling interface with µPs operating at different logic levels without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.313V (typ), ±2.5% over -40°C to +125°C - ensures reliable detection of 2.3V system rail brownout |
| RESET IN Threshold | 1.26V (fixed reference), enables monitoring of secondary rails ≥1.26V via external resistor divider |
| Quiescent Current | 1.7µA (typ) at +25°C - supports >10-year battery life in portable medical sensors |
| Reset Timeout Base | 275µs minimum (CSRT = 0F) - guarantees sufficient hold time for slow-start µPs before release |
| Output Type | Active-low open-drain - allows wired-OR configuration and flexible pull-up to 1.8V/3.3V/5V logic domains |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive and industrial control environments |
| VCC Range | 1.0V to 5.5V - ensures valid RESET assertion even during deep brownout conditions |
Pinout & Package
SOT23-5 package: ultra-compact surface-mount outline (2.9mm × 1.6mm × 1.1mm), thermally enhanced, RoHS-compliant, tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low open-drain reset output | Drives µP reset input low; requires external pull-up; sinks up to 50µA at VCC ≥1.0V |
| 2 - GND | Ground reference | Primary return path for internal comparators and current source; must be low-impedance |
| 3 - RESET IN | Adjustable reset threshold input | High-impedance node (≤10nA leakage); connects to center tap of R1/R2 divider to set VMON_TH |
| 4 - MR | Manual reset input | Active-low; internally pulled up to VCC (20kΩ); asserts reset when pulled ≤0.3×VCC |
| 5 - SRT | Set reset timeout capacitor connection | 240nA precision current source output; connects to external timing capacitor (low-leakage ceramic) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises VCC (2.313V fixed) and a second rail (e.g., 1.8V, 2.5V) via RESET IN resistor network |
| Capacitor-adjustable timeout | Timeout programmable from 275µs to >100ms using 0–10nF ceramic capacitor on SRT pin |
| Low-power operation | 1.7µA supply current enables use in always-on battery-backed systems without significant drain |
| Open-drain RESET output | Supports multi-drop reset bus and logic-level translation - pull-up can be to any supply ≤6.0V |
| High-temperature reliability | Guaranteed operation and parameter stability from -40°C to +125°C per AEC-Q100 stress requirements |
Applications
| Automotive Engine Control Unit (ECU) | Portable Medical Glucose Monitor |
|---|---|
Use Scenario: Monitors both 5V sensor supply and 3.3V MCU core rail in engine bay environment subject to thermal cycling and transients. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting RESET if either rail drops below specification during cold crank or load dump events. Use Value: Prevents ECU firmware corruption by guaranteeing clean reset initiation and 275µs+ hold time, even at 125°C junction temperature. | Use Scenario: Powers on/off sequence control in disposable glucose meter with coin-cell battery and low-power ARM Cortex-M0 MCU. IC Role / Device Role / Timing Role: Provides VCC (3.0V) supervision and manual reset via tactile switch, with timeout set to 100ms for safe bootloader entry. Use Value: 1.7µA quiescent current extends single-cell battery life beyond 2 years in standby; open-drain output interfaces directly to 1.8V MCU reset pin. |
| Industrial PLC I/O Module | Smart Energy Meter |
Use Scenario: Supervises isolated 24V field power and 5V logic rail in DIN-rail mounted controller exposed to EMI and voltage surges. IC Role / Device Role / Timing Role: Uses RESET IN to monitor derived 5V rail while VCC monitors local 3.3V FPGA supply; MR enables field-service reset. Use Value: Power-supply transient immunity prevents false resets during 2kV EFT bursts; -40°C to +125°C rating ensures reliability in uncooled enclosures. | Use Scenario: Ensures secure boot integrity in revenue-grade meter with tamper-detection circuitry and real-time clock backup. IC Role / Device Role / Timing Role: Supervises main 3.3V supply and RTC 3.0V backup rail; RESET output held active until both rails stabilize post-power-fail. Use Value: Dual-threshold capability eliminates need for two discrete supervisors, reducing BOM count and PCB area in tight meter form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT23D3+ | Fixed 2.32V threshold, no adjustable input, push-pull output, 3µA ICC | Single-rail only; lacks dual-monitoring capability and open-drain flexibility | Choose when only VCC supervision is needed and board layout prohibits external resistor divider |
| TPS3808G33DBVR | Fixed 3.3V threshold, no adjustable input, open-drain output, 1.1µA ICC, 200ms min timeout | Higher threshold; no secondary rail monitoring; longer fixed timeout limits fast-boot systems | Prefer for cost-sensitive 3.3V-only applications where 200ms reset hold is acceptable |
Compared with MAX6420UK23-T, MAX6326UT23D3+ simplifies design but sacrifices dual-voltage capability, while TPS3808G33DBVR reduces current draw yet locks timeout and threshold - MAX6420UK23-T uniquely balances adjustability, low power, and dual-rail robustness in one SOT23-5 device.
Availability
MAX6420UK23-T is available at Aetrix Electronics and suitable for automotive engine control units, portable medical devices, industrial PLC modules, smart energy meters, and battery-powered controllers requiring stable component supply across extended temperature ranges.
Supply support for MAX6420UK23-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 family was designed specifically for ultra-low-power, high-temperature microprocessor supervision in safety-critical systems where dual-rail monitoring and programmable reset timing are essential.
FAQ
What is the exact VCC reset threshold voltage for MAX6420UK23-T?
The MAX6420UK23-T has a factory-trimmed VCC reset threshold of 2.313V (typical), with tolerance of ±2.5% over the full -40°C to +125°C operating range. This value corresponds to the "23" suffix in the part number, per Maxim's Reset Voltages Suffix Table. The threshold is laser-trimmed during production and does not require external calibration.
How do I calculate the external capacitor value for a 50ms reset timeout with MAX6420UK23-T?
Use the formula CSRT = (tRP − 275µs) / 2.71×10⁶, where tRP is in seconds. For 50ms: CSRT = (0.05 − 0.000275) / 2,710,000 ≈ 18.3nF. A standard 18nF X7R ceramic capacitor (low leakage, <10nA) is recommended. The MAX6420UK23-T SRT pin sources a precise 240nA current to charge this capacitor.
Can MAX6420UK23-T monitor a 1.8V rail as the secondary voltage?
Yes. The MAX6420UK23-T RESET IN pin uses a fixed 1.26V internal reference. To monitor a 1.8V rail, connect it to RESET IN via a resistor divider: select R2 = 1MΩ and calculate R1 = R2 × (1.8V / 1.26V − 1) ≈ 429kΩ. The MAX6420UK23-T will assert RESET if the divided voltage at RESET IN falls below 1.26V.
What is the maximum allowable voltage on the RESET pin of MAX6420UK23-T?
The RESET pin of MAX6420UK23-T is open-drain and rated for up to +6.0V, independent of VCC. This allows pull-up to higher logic supplies (e.g., 5V) while VCC operates at 3.3V or lower. The absolute maximum rating is +6.0V; exceeding this may damage the output FET. Leakage current remains ≤1.0µA when reset is not asserted.
Does MAX6420UK23-T provide reset assertion during VCC power-up from 0V?
Yes. The MAX6420UK23-T guarantees valid RESET assertion down to VCC = 1.0V. Below 1.0V, the output may become indeterminate. For applications requiring guaranteed logic state down to 0V, add a 100kΩ pulldown resistor from RESET to GND - this holds the line low during deep undervoltage, as confirmed in Maxim's application guidance for MAX6420UK23-T.
MAX6420UK23-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.313V, 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
MAX6420UK23-T FAQ
1.How can I place an order for MAX6420UK23-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6420UK23-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 MAX6420UK23-T reliable?
The price and inventory of MAX6420UK23-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6420UK23-T is usually 5 days.
3.What payment methods are accepted for MAX6420UK23-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6420UK23-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6420UK23-T?
MAX6420UK23-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6420UK23-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 MAX6420UK23-T?
For technical support, including MAX6420UK23-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6420UK23-T requirements.
6.How does Aetrix verify that MAX6420UK23-T is sourced from the original manufacturer or authorized distributors?
All MAX6420UK23-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 MAX6420UK23-T meets industry standards.
7.What is the process for return or replacement of MAX6420UK23-T?
All MAX6420UK23-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6420UK23-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 MAX6420UK23-T part is unused and in its original packaging.
Return procedure for MAX6420UK23-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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