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Analog Devices Inc./Maxim Integrated MAX6419UK50-T
- Part No.:
- MAX6419UK50-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6419UK50-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6419UK50-T from Maxim Integrated is a low-power, dual-voltage microprocessor reset supervisor IC with one factory-trimmed VCC reset threshold (5.0V nominal) and one adjustable RESET IN input for monitoring secondary voltages down to 1.26V. It features an active-high push-pull RESET output, capacitor-adjustable reset timeout delay (275µs to >100ms), manual reset capability via MR pin, and guaranteed reset validity down to VCC = 1V. It is used in automotive power management systems to ensure reliable µP initialization during cold-crank or battery brownout events.
For engineers reviewing the MAX6419UK50-T datasheet, MAX6419UK50-T pinout, MAX6419UK50-T application, or MAX6419UK50-T equivalent, this page delivers verified specifications, SOT23-5 package details, dual-threshold supervision logic, reset timeout capacitor calculation guidance, and real-world selection alternatives for critical voltage-monitoring designs.
Technical Context
The MAX6419UK50-T implements dual independent supervision paths: a laser-trimmed 5.0V ±2.5% VCC monitor and a high-impedance RESET IN comparator referenced to 1.26V, enabling precise external voltage detection via resistor divider. Its reset assertion is triggered by VCC falling below 5.0V, RESET IN falling below its programmed threshold, or MR being pulled low.
Reset deassertion follows a capacitor-controlled ramp: a 240nA current source charges CSRT from SRT to ground until reaching 0.65V, yielding tRP = (2.71 × 10⁶) × CSRT + 275µs. The active-high push-pull RESET output drives up to 800µA at VOH ≥ 0.8 × VCC and sinks 3.2mA at VOL ≤ 0.4V (VCC ≥ 4.5V), ensuring robust µP interface compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and full-system power-up sequencing. |
| VCC Reset Threshold | 5.00V (nominal), ±2.5% over -40°C to +125°C - factory-trimmed for stable 5V rail monitoring without external components. |
| RESET IN Threshold | 1.26V (fixed reference), adjustable VMON_TH ≥ 1.26V via external resistor divider - enables accurate monitoring of auxiliary rails (e.g., 3.3V, 2.5V, 1.8V). |
| Quiescent Current | 1.7µA (typ) at +25°C - enables multi-year battery life in portable and automotive always-on modules. |
| Reset Timeout Range | 275µs (CSRT = 0F) to >100ms (CSRT = 100nF) - programmable delay ensures µP core and peripherals stabilize before release. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial embedded environments. |
| Output Type | Active-high push-pull - eliminates need for external pull-up resistors and ensures fast, low-impedance RESET assertion/deassertion. |
Pinout & Package
SOT23-5 package: ultra-compact 2.9mm × 1.6mm footprint with 0.95mm pitch, optimized for space-constrained automotive and portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push-pull reset output | Drives µP reset input directly; VOH ≥ 0.8×VCC, VOL ≤ 0.4V (VCC ≥ 4.5V); no external pull-up required. |
| 2 - GND | Ground reference | Primary return path for internal comparators, ramp current source, and output driver; must be low-impedance. |
| 3 - RESET IN | Adjustable reset input | High-impedance (≤10nA leakage) comparator input; sets secondary voltage threshold using R1/R2 divider per VMON_TH = 1.26×(R1+R2)/R2. |
| 4 - MR | Manual reset input | Active-low input with 20kΩ internal pull-up; asserts reset when pulled to GND; debounced internally for >1µs pulses. |
| 5 - SRT | Set reset timeout input | 240nA precision current source node; connects to external timing capacitor (CSRT) to ground for programmable tRP. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage supervision | Simultaneously monitors 5.0V VCC rail and user-defined auxiliary voltage (e.g., 3.3V) with independent thresholds and fault detection. |
| Capacitor-adjustable reset timeout | Enables precise tRP tuning from 275µs to >100ms using a single low-leakage ceramic capacitor on SRT-no trimming resistors needed. |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic RESET logic state during severe brownout; pull-up resistor (100kΩ to VCC) maintains valid high level below 1V. |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs duration when overdrive is ≤100mV - prevents spurious resets during engine cranking or load switching. |
| Automotive-grade temperature range | Specified from -40°C to +125°C with production testing across full range - meets AEC-Q100 stress requirements for under-hood use. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance Systems (ADAS) |
|---|---|
|
Use Scenario: Monitors 5V microcontroller supply and 3.3V sensor interface rail during vehicle start-stop cycles and cold-crank conditions. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting active-high RESET until both rails exceed thresholds and timeout expires. Use Value: Prevents ECU firmware lockup during <1.0V battery dips by holding µP in reset until stable 5V/3.3V are confirmed and internal clocks settle. |
Use Scenario: Ensures clean boot of vision-processing SoC after power-on and during CAN bus wake-up events. IC Role / Device Role / Timing Role: Supervises main 5V domain and auxiliary 1.8V core rail; uses MR pin for system-level watchdog-triggered recovery. Use Value: Eliminates need for discrete RC timers and dual comparators - reduces BOM count while guaranteeing synchronized reset release. |
| Medical Infusion Pump | Industrial PLC I/O Module |
|
Use Scenario: Validates battery-backed 3.3V logic rail and isolated 5V actuator driver supply before motor activation. IC Role / Device Role / Timing Role: Dual-input supervisor with capacitor-programmed timeout ensures safety-critical MCU boots only after both supplies stabilize. Use Value: Meets IEC 62304 Class C software safety requirements by preventing partial initialization during marginal power conditions. |
Use Scenario: Monitors 24V-to-5V DC/DC output and isolated 3.3V FPGA configuration rail in harsh factory environments. IC Role / Device Role / Timing Role: Uses RESET IN to track regulated 3.3V and VCC to track primary 5V; MR pin interfaces to PLC master reset signal. Use Value: Provides deterministic power-on reset coordination across mixed-voltage subsystems without custom timing circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK50-T | Active-low open-drain RESET output; requires external pull-up; identical dual-threshold architecture and timing. | Suitable where µP reset input is active-low and shared with other open-drain signals (e.g., I²C bus reset). | Select when system-level reset net uses wired-OR logic or requires level-shifting across multiple supply domains. |
| TLV809E50DBVR | Single 5.0V fixed-threshold supervisor; no adjustable RESET IN; 350ms fixed timeout; SOT23-3 package. | Lacks dual-rail monitoring and timeout adjustability; lower quiescent current (0.5µA) but no MR or auxiliary input. | Choose only for cost-sensitive, single-rail applications where auxiliary voltage supervision is handled elsewhere. |
Compared with MAX6419UK50-T, MAX6420UK50-T offers identical supervision accuracy and flexibility but requires external pull-up and supports wired-OR reset nets, whereas TLV809E50DBVR sacrifices dual-voltage capability and programmability for lower cost and ultra-low ICC - making it unsuitable for systems requiring coordinated multi-rail reset sequencing.
Availability
MAX6419UK50-T is available at Aetrix Electronics and suitable for automotive ECU, ADAS camera modules, medical infusion pumps, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6419UK50-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 demanding industrial, automotive, and medical applications.
The MAX6412–MAX6420 family was designed specifically for robust, low-power microprocessor supervision in harsh environments - delivering precision voltage monitoring, flexible reset timing, and automotive-grade reliability in minimal SOT23-5 packaging.
FAQ
What is the factory-set VCC reset threshold for MAX6419UK50-T?
The MAX6419UK50-T has a factory-trimmed VCC reset threshold of 5.00V (nominal), with tolerance of ±2.5% over the full -40°C to +125°C operating range. This value is confirmed in Table 1 of the datasheet (suffix "50" corresponds to 4.875V min / 5.000V typ / 5.125V max), and is laser-trimmed during production to eliminate external calibration components.
How do I calculate the reset timeout capacitor for MAX6419UK50-T?
Use the formula CSRT = (tRP − 275µs) / 2.71 × 10⁶, where tRP is the desired timeout in seconds and CSRT is in farads. For example, a 50ms timeout requires CSRT ≈ 18.4nF. The MAX6419UK50-T's SRT pin sources a precise 240nA current; ceramic capacitors with leakage <10nA are recommended to maintain timing accuracy.
Can MAX6419UK50-T monitor a 3.3V rail as the secondary voltage?
Yes. The MAX6419UK50-T's RESET IN pin accepts an externally divided voltage. To monitor 3.3V, configure R1 and R2 such that VMON_TH = 1.26V × (R1 + R2)/R2 = 3.3V - e.g., R2 = 1MΩ and R1 ≈ 1.62MΩ. The device guarantees RESET IN threshold accuracy of ±2.5% over temperature, ensuring reliable 3.3V supervision.
Does MAX6419UK50-T support manual reset functionality?
Yes. The MAX6419UK50-T includes an MR (manual reset) pin (Pin 4) that asserts RESET when pulled low. It features a 20kΩ internal pull-up resistor, so the pin can be left floating if unused. A momentary switch from MR to GND provides hardware-initiated reset, with reset held for the full timeout period after switch release.
What is the minimum VCC required for MAX6419UK50-T to guarantee valid RESET output?
The MAX6419UK50-T guarantees valid RESET output down to VCC = 1.0V. Below 1V, output drive strength declines. For applications requiring valid logic down to VCC = 0V, a 100kΩ pull-up resistor from RESET to VCC is recommended - this ensures the MAX6419UK50-T's active-high RESET remains high even during deep brownout.
MAX6419UK50-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:
- 5V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6419UK50-T FAQ
1.How can I place an order for MAX6419UK50-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6419UK50-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 MAX6419UK50-T reliable?
The price and inventory of MAX6419UK50-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6419UK50-T is usually 5 days.
3.What payment methods are accepted for MAX6419UK50-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6419UK50-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6419UK50-T?
MAX6419UK50-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6419UK50-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 MAX6419UK50-T?
For technical support, including MAX6419UK50-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6419UK50-T requirements.
6.How does Aetrix verify that MAX6419UK50-T is sourced from the original manufacturer or authorized distributors?
All MAX6419UK50-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 MAX6419UK50-T meets industry standards.
7.What is the process for return or replacement of MAX6419UK50-T?
All MAX6419UK50-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6419UK50-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 MAX6419UK50-T part is unused and in its original packaging.
Return procedure for MAX6419UK50-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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