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Analog Devices Inc./Maxim Integrated MAX6419UK16+
- Part No.:
- MAX6419UK16+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6419UK16+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,958
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Product details
Overview
The MAX6419UK16+ from Maxim Integrated is a low-power dual-voltage microprocessor supervisor IC with one factory-trimmed VCC reset threshold (1.575V 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 (275µs to 5.75ms), manual reset capability via MR pin, and operates across -40°C to +125°C in SOT23-5. It is used in automotive ECUs to ensure reliable µP initialization during multi-rail power sequencing.
For engineers reviewing the MAX6419UK16+ datasheet, MAX6419UK16+ pinout, MAX6419UK16+ application, or MAX6419UK16+ equivalent, key selection criteria include its dual-threshold architecture, guaranteed RESET validity down to VCC = 1V, ±2.5% VTH accuracy over temperature, 1.7µA typical supply current at 2V, and AEC-Q100 qualification for automotive use.
Technical Context
The MAX6419UK16+ implements dual independent voltage monitoring: a laser-trimmed internal comparator for VCC (1.575V ±2.5%) and an external resistor-divider–based comparator for RESET IN (threshold set by 1.26V reference). Its reset assertion logic triggers when either voltage falls below its respective threshold or MR is pulled low.
Reset deassertion is controlled by a precision 240nA current source charging an external capacitor on the SRT pin; the timeout period (tRP = 2.71×10⁶ × CSRT + 275µs) is programmable from sub-millisecond to >5ms. The active-high push-pull RESET output drives up to 800µA at VCC ≥ 4.5V while maintaining VOH ≥ 0.8×VCC across 1.0V–5.5V supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.575V ±2.5% over -40°C to +125°C - ensures accurate brownout detection for 1.8V/2.5V rails |
| RESET IN Threshold | 1.26V fixed reference - enables monitoring of secondary supplies as low as 1.26V using external resistors |
| Supply Current | 1.7µA typ at VCC ≤ 2.0V - supports ultra-low-power battery-backed systems |
| Reset Timeout Range | 275µs to 5.75ms (CSRT = 0F to 1500pF) - accommodates µP reset timing requirements from fast-boot to safety-critical delays |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial embedded environments |
| RESET Output Type | Active-high push-pull - eliminates need for external pull-up; compatible with standard µP reset inputs requiring high-active assertion |
| AEC-Q100 Grade | Qualified per /V variants - confirms reliability for automotive applications (note: MAX6419UK16+ is lead-free but /V suffix required for full AEC-Q100) |
Pinout & Package
SOT23-5 package (5-pin, 1.6mm × 2.9mm, 0.95mm height), RoHS-compliant, tape-and-reel delivery.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-high push-pull reset output | Drives µP reset input high during fault; sinks 500µA min at VCC ≥ 2.7V; no external pull-up needed |
| 2 - GND | Ground reference | Common return for all internal comparators, current sources, and output stage |
| 3 - RESET IN | Adjustable reset input | High-impedance node (10nA leakage) for external resistor divider; sets secondary voltage threshold via 1.26V reference |
| 4 - SRT | Set reset timeout input | Connects to external timing capacitor; hosts precision 240nA ramp current source - layout sensitivity requires short, noise-isolated trace |
| 5 - VCC | Supply and primary monitor input | Powers device and feeds fixed-threshold comparator; valid operation from 1.0V to 5.5V; RESET guaranteed high at VCC ≥ 1V |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (1.575V) and a user-defined secondary rail (e.g., 3.3V, 1.2V) without external comparators |
| Capacitor-programmable reset timeout | Enables precise, board-level tuning of reset duration (275µs–5.75ms) to match µP requirements without firmware changes |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout - critical for fail-safe shutdown in automotive systems |
| Low quiescent current (1.7µA typ) | Minimizes battery drain in always-on subsystems such as telematics or sensor nodes |
| Manual reset input (MR) | Internal 20kΩ pullup allows momentary switch-to-ground implementation - no external components required |
Applications
| Automotive Engine Control Unit (ECU) | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Monitors both 5V main supply and 3.3V MCU core rail during cold cranking, where battery dips to 6V and causes transient undervoltage. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserts RESET if either rail falls below spec; timeout set to 4.375ms ensures µP completes boot before CAN initialization. Use Value: Prevents erratic ECU behavior during start-stop cycles by enforcing synchronized reset across two critical power domains. | Use Scenario: Ensures safe power-up sequence for ARM-based controller and analog front-end in battery-powered infusion pump. IC Role / Device Role / Timing Role: Supervises 3.3V system rail and 1.8V ADC reference rail; MR pin connected to service mode button for field recalibration resets. Use Value: Eliminates risk of corrupted dose calculations due to partial power-up by guaranteeing both rails are stable before firmware execution. |
| Industrial PLC I/O Module | Smart Energy Meter MCU Subsystem |
Use Scenario: Detects undervoltage on isolated 24V field bus supply and 3.3V logic rail during lightning-induced transients. IC Role / Device Role / Timing Role: RESET IN monitors 24V via resistor divider (VMON_TH = 24V); VCC monitors 3.3V; timeout set to 5.75ms for robust glitch rejection. Use Value: Maintains deterministic state recovery after surge events - avoids spurious I/O toggling that could trigger unsafe actuator motion. | Use Scenario: Supervises 3.3V metrology SoC supply and 1.2V precision reference in tamper-resistant meter housing. IC Role / Device Role / Timing Role: Fixed VCC threshold (1.575V) guards against brownout; RESET IN monitors 1.2V ref via R1/R2 network; SRT capacitor selected for 3ms timeout. Use Value: Guarantees accurate energy measurement integrity by preventing firmware execution during unstable reference conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6420UK16+ | Same dual-threshold architecture and pinout, but open-drain RESET output instead of push-pull | Requires external pull-up; suited for wired-OR reset buses or level-shifting to higher-voltage µPs | Select MAX6420UK16+ only when open-drain functionality is explicitly needed - not a drop-in replacement for MAX6419UK16+ |
| TPS3808G16DBVR | Single-threshold (1.6V), fixed 200ms timeout, no adjustable RESET IN; 1.4µA ICC at 3.3V | Lacks dual-rail monitoring; suitable only for single-supply systems with fixed delay requirements | Choose TPS3808G16DBVR for cost-sensitive, single-rail applications where adjustable timeout and secondary rail monitoring are unnecessary |
Compared with MAX6419UK16+, MAX6420UK16+ offers identical monitoring capability but requires external pull-up and alters reset polarity handling, while TPS3808G16DBVR reduces design flexibility by removing both adjustable timeout and dual-threshold functionality - making MAX6419UK16+ the optimal choice for multi-rail, timing-critical automotive and industrial systems.
Availability
MAX6419UK16+ is available at Aetrix Electronics and suitable for automotive engine control units, medical infusion pump controllers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6419UK16+ 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 automotive, industrial, and computing applications, with emphasis on reliability and low-power operation.
The MAX6412–MAX6420 family was developed specifically for robust, low-quiescent-current microprocessor supervision in harsh environments - targeting dual-rail power sequencing, brownout immunity, and AEC-Q100-compliant automotive subsystems.
FAQ
What is the exact VCC reset threshold voltage for MAX6419UK16+?
The MAX6419UK16+ has a factory-trimmed VCC reset threshold of 1.575V nominal, 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 of the datasheet under suffix "16", and applies specifically to the MAX6419UK16+ variant within the MAX6412–MAX6420 family.
Does MAX6419UK16+ support monitoring a 3.3V rail as the secondary voltage?
Yes, MAX6419UK16+ supports monitoring a 3.3V rail via its RESET IN pin using an external resistor divider. With a fixed 1.26V internal reference, a standard divider (e.g., R1 = 1.62MΩ, R2 = 1MΩ) sets VMON_TH = 3.3V. The MAX6419UK16+ datasheet Figure 4 and Reset Threshold section provide the exact calculation: VMON_TH = 1.26 × (R1 + R2)/R2.
What is the minimum recommended capacitor value for the SRT pin on MAX6419UK16+?
The SRT pin on MAX6419UK16+ supports CSRT = 0F (no capacitor), yielding a minimum reset timeout of 275µs. For longer delays, ceramic capacitors ≥100pF are recommended to minimize leakage (<10nA); 1500pF gives 4.375ms typical. Avoid electrolytic or high-leakage types - the MAX6419UK16+ datasheet specifies low-leakage ceramic as optimal.
Is MAX6419UK16+ AEC-Q100 qualified?
The MAX6419UK16+ is offered in lead-free packaging (+ suffix) and operates across -40°C to +125°C, but full AEC-Q100 qualification requires the /V suffix (e.g., MAX6419UK16/V+T). Per the Ordering Information table, /V denotes automotive-qualified versions - MAX6419UK16+ alone is not AEC-Q100 certified unless ordered with /V.
How does the manual reset (MR) function work on MAX6419UK16+?
The MR pin on MAX6419UK16+ is internally pulled up to VCC with 20kΩ. Pulling MR low asserts RESET high for the full timeout period (e.g., 4.375ms with 1500pF), then RESET returns low. No external components are needed - a momentary switch from MR to GND suffices. MR pulse width must exceed 1µs, and the device rejects glitches <75ns.
MAX6419UK16+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.575V, 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
MAX6419UK16+ FAQ
1.How can I place an order for MAX6419UK16+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6419UK16+ 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 MAX6419UK16+ reliable?
The price and inventory of MAX6419UK16+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6419UK16+ is usually 5 days.
3.What payment methods are accepted for MAX6419UK16+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6419UK16+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6419UK16+?
MAX6419UK16+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6419UK16+ 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 MAX6419UK16+?
For technical support, including MAX6419UK16+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6419UK16+ requirements.
6.How does Aetrix verify that MAX6419UK16+ is sourced from the original manufacturer or authorized distributors?
All MAX6419UK16+ 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 MAX6419UK16+ meets industry standards.
7.What is the process for return or replacement of MAX6419UK16+?
All MAX6419UK16+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6419UK16+, 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 MAX6419UK16+ part is unused and in its original packaging.
Return procedure for MAX6419UK16+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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