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Analog Devices Inc./Maxim Integrated MAX6418UK22
- Part No.:
- MAX6418UK22
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6418UK22.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,377
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Product details
Overview
MAX6418UK22 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 push-pull RESET output, capacitor-adjustable reset timeout delay, manual reset capability via MR pin, and operates across -40°C to +125°C in SOT23-5 package. It is used in automotive and industrial embedded controllers requiring reliable brownout detection and dual-rail power sequencing.
For engineers reviewing the MAX6418UK22 datasheet, MAX6418UK22 pinout, MAX6418UK22 application, or MAX6418UK22 equivalent, key selection considerations include its dual-threshold architecture, 1.7µA quiescent current, guaranteed RESET validity down to VCC = 1V, SRT capacitor-based timeout programming, and compatibility with 1.6V–5V system rails.
Technical Context
The MAX6418UK22 integrates two independent reset comparators: one laser-trimmed internal reference for VCC monitoring at 2.188V (±2.5% over temperature), and a high-impedance RESET IN comparator with 1.255V threshold referenced to an internal 1.26V bandgap. Reset assertion occurs if either VCC falls below its threshold or RESET IN drops below 1.255V - enabling simultaneous supervision of primary and auxiliary supply rails.
Its reset timeout is set by an external capacitor on the SRT pin, charged by a precision 240nA current source to a 0.65V internal reference; deassertion occurs once the ramp reaches that level. The MR input includes a 20kΩ internal pullup and supports glitch rejection (75ns) and sub-microsecond pulse detection (1µs minimum width).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.188V typical (suffix "22"), ±2.5% over -40°C to +125°C - ensures accurate brownout detection for 2.2V nominal rails |
| RESET IN Threshold | 1.255V (1.205V to 1.255V min/max), stable over temperature - enables precise monitoring of auxiliary supplies like 1.2V or 1.8V rails |
| Quiescent Current | 1.7µA typical at +25°C - supports ultra-low-power battery-backed systems and always-on monitoring |
| Reset Timeout Range | 275µs to >100ms via 0–15nF SRT capacitor - accommodates µP reset timing requirements from fast-boot to safety-critical lockout |
| Operating Voltage Range | 1.0V to 5.5V VCC - guarantees functional reset assertion even during deep brownout conditions |
| Output Type | Active-low push-pull RESET - drives µP reset inputs directly without external pullup, sinking up to 3.2mA at VCC ≥ 4.5V |
| Temperature Range | -40°C to +125°C - qualified for under-hood automotive, industrial control, and medical equipment environments |
Pinout & Package
SOT23-5 package (5-pin, 1.6mm × 2.9mm, 0.95mm height), lead-free RoHS-compliant, thermal pad optional. Pin 1 marked with dot; top-mark "ADYI" per Maxim standard marking table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Drives µP /RESET input directly; sinks 3.2mA at VCC ≥ 4.5V; valid down to VCC = 1V |
| 2 - GND | Ground reference | Common return for all internal circuitry and external capacitor (SRT) |
| 3 - RESET IN | Adjustable voltage monitor input | High-impedance (10nA leakage) comparator input; sets secondary rail threshold via resistor divider |
| 4 - MR | Manual reset input | Active-low; internally pulled up to VCC (20kΩ); asserts reset for full timeout after release |
| 5 - SRT | Reset timeout capacitor connection | 240nA precision current source node; requires low-leakage ceramic capacitor to ground |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage monitoring | Simultaneously supervises VCC (2.188V fixed) and a second rail (e.g., 1.2V/1.8V) via RESET IN - eliminates need for two discrete supervisors |
| Capacitor-adjustable timeout | External SRT capacitor sets reset hold time from 275µs to >100ms - enables precise alignment with µP boot sequence timing |
| Low-power operation | 1.7µA typical ICC allows continuous monitoring in energy-constrained applications such as portable medical devices and remote sensors |
| Robust reset assertion | Guaranteed RESET validity down to VCC = 1V and immunity to <50µs transients at 100mV overdrive - prevents spurious resets in noisy environments |
| Integrated manual reset | MR pin with 20kΩ internal pullup and 1µs minimum pulse width support - simplifies front-panel reset implementation without external components |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors both 5V main logic supply and 3.3V sensor interface rail in engine management systems exposed to wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserting reset if either rail dips below specification during cold cranking or load dump events. Use Value: Prevents ECU firmware corruption by ensuring deterministic reset before µP executes invalid code due to undervoltage on either critical rail. | Use Scenario: Supervises 24V field-side power converted to 3.3V and 1.2V for FPGA configuration and analog front-end in programmable logic controllers. IC Role / Device Role / Timing Role: Simultaneously monitors primary 3.3V digital core and secondary 1.2V FPGA I/O supply using fixed and adjustable thresholds. Use Value: Enables safe power-up sequencing and brownout recovery without external resistors or additional ICs - reducing BOM count and PCB area. |
| Battery-Powered Medical Monitor | Set-Top Box Power Management |
Use Scenario: Provides fail-safe reset for ARM Cortex-M based patient vital sign recorder operating from single-cell Li-ion (2.7–4.2V) with internal 1.8V LDO. IC Role / Device Role / Timing Role: Uses VCC threshold (2.188V) to detect battery depletion and RESET IN to monitor regulated 1.8V rail for LDO failure. Use Value: Ensures clinical data integrity by triggering controlled shutdown before memory corruption occurs - meeting IEC 62304 safety requirements. | Use Scenario: Manages power sequencing and fault response in consumer STB with multiple voltage domains: 12V, 5V, 3.3V, and 1.2V. IC Role / Device Role / Timing Role: Supervises 3.3V SoC supply (fixed threshold) and 1.2V DDR termination rail (via RESET IN divider) to prevent boot failures. Use Value: Eliminates boot hangs caused by marginal DDR voltage by asserting reset before SoC attempts memory initialization. |
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 |
|---|---|---|---|
| MAX6419UK22-T | Identical dual-threshold architecture and pinout, but active-high push-pull RESET output | Requires µP with active-high reset input; incompatible with active-low-only designs without level translation | Select when host µP demands active-high reset assertion and board layout cannot accommodate inversion |
| TPS3808G18DBVR | Single-threshold (1.8V) supervisor with fixed 200ms timeout; no adjustable RESET IN or manual reset | Lacks dual-rail monitoring and user-programmable timeout; suitable only for single-rail applications | Choose only for cost-sensitive, single-supply systems where secondary rail supervision is unnecessary |
Compared with MAX6419UK22-T, MAX6418UK22 offers active-low reset polarity essential for legacy µPs, while TPS3808G18DBVR trades flexibility for lower unit cost and simpler design - making MAX6418UK22 the optimal choice for dual-rail, low-power, automotive-grade supervision where timing and polarity are critical.
Availability
MAX6418UK22 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, battery-powered medical monitors, and set-top box power management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6418UK22 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 industrial, automotive, and communications markets.
The MAX6412–MAX6420 family was designed specifically for robust, low-power microprocessor supervision in harsh environments - emphasizing dual-rail monitoring, capacitor-programmable timing, and guaranteed operation down to 1V VCC.
FAQ
What is the exact VCC reset threshold voltage for MAX6418UK22?
The MAX6418UK22 has a factory-trimmed VCC reset threshold of 2.188V typical (2.133V min / 2.243V max), corresponding to suffix "22" per Maxim's Reset Voltages Suffix Table. This value is guaranteed over the full -40°C to +125°C operating range with ±2.5% accuracy, making it suitable for supervising 2.2V nominal supply rails in automotive and industrial applications.
How do I calculate the SRT capacitor value for a 50ms reset timeout with MAX6418UK22?
Use the formula CSRT = (tRP − 275µs) / 2.71×10⁶, where tRP is in seconds. For 50ms (0.05s): CSRT = (0.05 − 0.000275) / 2,710,000 ≈ 18.3nF. A standard 18nF X7R ceramic capacitor with <10nA leakage is recommended. Verify timing with oscilloscope measurement, as layout parasitics and capacitor tolerance affect final accuracy.
Can MAX6418UK22 monitor a 1.2V supply using the RESET IN pin?
Yes. The RESET IN pin has a fixed 1.255V threshold, so to monitor a 1.2V rail, use a resistor divider (e.g., R1 = 1MΩ, R2 = 12.5MΩ) to scale the 1.2V rail up to ~1.255V at RESET IN. The MAX6418UK22 datasheet provides the exact formula: VMON_TH = 1.26 × (R1 + R2)/R2. This enables precise supervision of sub-1.8V supplies without external comparators.
Does MAX6418UK22 require external components for basic operation?
Only the SRT capacitor is required for programmable timeout; all other functions operate with zero external parts. The MR pin has an internal 20kΩ pullup, RESET IN uses internal biasing, and the push-pull RESET output drives µP inputs directly. A 100kΩ pulldown on RESET is optional only if valid logic down to VCC = 0V is needed - not required for standard operation.
Is MAX6418UK22 qualified for automotive applications?
Yes - the MAX6418UK22 is fully specified from -40°C to +125°C and manufactured in Maxim's AEC-Q100–qualified process. While the base part number does not carry the "/V" automotive suffix, its datasheet explicitly lists Automotive as a target application, and its electrical specs (e.g., transient immunity, wide VCC range, guaranteed 1V operation) meet automotive subsystem requirements. For ASIL-B systems, verify compliance with your Tier 1's qualification protocol.
MAX6418UK22 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:
- 2.188V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6418UK22 FAQ
1.How can I place an order for MAX6418UK22 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6418UK22 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 MAX6418UK22 reliable?
The price and inventory of MAX6418UK22 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6418UK22 is usually 5 days.
3.What payment methods are accepted for MAX6418UK22?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6418UK22 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6418UK22?
MAX6418UK22 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6418UK22 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 MAX6418UK22?
For technical support, including MAX6418UK22 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6418UK22 requirements.
6.How does Aetrix verify that MAX6418UK22 is sourced from the original manufacturer or authorized distributors?
All MAX6418UK22 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 MAX6418UK22 meets industry standards.
7.What is the process for return or replacement of MAX6418UK22?
All MAX6418UK22 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6418UK22, 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 MAX6418UK22 part is unused and in its original packaging.
Return procedure for MAX6418UK22:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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