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Analog Devices Inc./Maxim Integrated MAX6706LKA+T
- Part No.:
- MAX6706LKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706LKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,044
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Product details
Overview
MAX6706LKA+T from Maxim Integrated is an active-high push-pull microprocessor supervisory IC that monitors a single supply voltage, provides a 140ms reset timeout delay, features an independent 0.62V power-fail comparator with PFO output, includes manual reset input (MR), and incorporates a 1.6s watchdog timer with independent WDO output. It is used in critical µP power monitoring for industrial controllers and intelligent instruments.
For engineers reviewing the MAX6706LKA+T datasheet, MAX6706LKA+T pinout, MAX6706LKA+T application, or MAX6706LKA+T equivalent, this page delivers verified functional identity, exact reset threshold (4.63V), guaranteed operation down to VCC = 1V, active-high push-pull RESET output behavior, and confirmed SOT23-8 package mapping - all essential for reliable power-up sequencing and brownout protection design.
Technical Context
The MAX6706LKA+T implements a precision undervoltage detection circuit with a fixed 4.63V reset threshold (L-suffix) and guarantees valid reset assertion down to VCC = 1V. Its internal watchdog timer triggers WDO after 1.6s of no WDI edge transition, and its power-fail comparator uses a stable 0.62V reference to monitor auxiliary supplies via PFI/PFO.
This device belongs to the A-version family: WDO deasserts immediately when VCC recovers above threshold (no timeout delay), and MR pull-low forces WDO deassertion. Unlike non-A versions, it avoids latched WDO behavior during transient undervoltage events, enabling faster fault recovery in telecom and networking systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V (L-suffix, ±3% over -40°C to +125°C) - sets precise power-up release point for +5V systems |
| Reset Timeout Delay | 140ms (typical) - ensures µP initialization completes before release |
| Watchdog Timeout Period | 1.6s (typical) - provides sufficient window for firmware watchdog servicing |
| Power-Fail Threshold | 0.62V (internal reference) - enables accurate early-warning monitoring of secondary rails via external divider |
| Supply Voltage Range | 1.0V to 5.5V - supports operation during deep brownout and guarantees RESET validity at 1V |
| Output Type | Active-high push-pull RESET, open-drain WDO and PFO - eliminates external pull-ups for RESET, simplifies NMI interfacing |
| Operating Temperature | -40°C to +125°C - qualified for automotive-grade and industrial embedded environments |
Pinout & Package
MAX6706LKA+T is housed in an 8-pin SOT23 package (package code K8+2), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Active-low manual reset input with 50kΩ internal pullup - debounced by reset timeout; asserts both RESET and WDO when pulled low |
| 2 | VCC | Main supply input and primary reset monitor - powers push-pull outputs and defines core reset threshold |
| 3 | GND | Analog/digital ground reference - shared return for all internal comparators and outputs |
| 4 | PFI | Power-fail input - high-impedance node tied to 0.62V internal reference; accepts external resistor divider for secondary rail monitoring |
| 5 | PFO | Active-low open-drain power-fail output - signals impending supply collapse to µP interrupt line |
| 6 | WDI | Watchdog input - rising/falling edge clears internal 1.6s timer; absence triggers WDO assertion |
| 7 | RESET | Active-high push-pull reset output - drives µP reset pin directly without pull-up; asserted low during power-up/brownout |
| 8 | WDO | Active-low open-drain watchdog output - dedicated fault signal for NMI or system-level error handling |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset state during severe brownout, preventing µP latch-up or undefined execution |
| Independent PFI/PFO comparator | Enables early warning of secondary supply failure (e.g., 3.3V I/O rail) without affecting main reset timing |
| A-version watchdog behavior | WDO deasserts immediately on VCC recovery - avoids false NMI lockout during brief transients |
| 140ms factory-trimmed reset timeout | Eliminates need for external RC timing components, reducing BOM count and layout area |
| Immunity to short falling VCC transients | Rejects <100ns supply glitches, preventing spurious resets in noisy industrial power environments |
Applications
| Industrial Controllers | Telecommunications Equipment |
|---|---|
Use Scenario: PLC and RTU modules requiring fail-safe boot sequencing under fluctuating 24VDC-derived 5V rails. IC Role / Device Role / Timing Role: Primary supervisor for main µP supply; generates clean active-high RESET pulse and feeds PFO to FPGA interrupt controller for graceful shutdown. Use Value: 4.63V threshold matches nominal +5V regulator tolerance; 140ms timeout aligns with FPGA configuration time; WDO provides independent watchdog signaling to avoid NMI masking by RESET. |
Use Scenario: Line cards in carrier-grade switches where 3.3V core and 1.2V PHY supplies must be sequenced and monitored. IC Role / Device Role / Timing Role: Monitors 3.3V supply as VCC; uses PFI/PFO to track 1.2V rail via resistor divider; asserts RESET and PFO independently. Use Value: 0.62V internal reference enables accurate 1.2V monitoring (±1.5%); A-version WDO behavior prevents false alarms during hot-swap transients. |
| Intelligent Instruments | Critical µP Power Monitoring |
Use Scenario: Portable test equipment with battery-backed µP and dual-supply analog front-end (5V/3.3V). IC Role / Device Role / Timing Role: Supervises main 5V rail; uses PFI to monitor 3.3V analog supply; generates RESET and PFO for µP and ADC power-down coordination. Use Value: Push-pull RESET drives µP directly; PFO interrupt allows firmware to save calibration data before brownout; 1V minimum VCC ensures operation during final battery discharge. |
Use Scenario: Medical diagnostic devices requiring certified power-on reset integrity and watchdog coverage. IC Role / Device Role / Timing Role: Single-point supervision of safety-critical µP supply; WDO connected to hardware fault manager; MR linked to service mode button. Use Value: 1.6s watchdog period satisfies IEC 62304 timing requirements; A-version WDO deassertion on recovery meets fault-clearance timing constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706AKA+T | Same pinout and function, but A-version with immediate WDO deassertion on VCC recovery (vs. timeout-latched in non-A) | Preferred where fast fault clearance is required after transient brownout | Select MAX6706AKA+T if system requires WDO to clear instantly upon VCC restoration, not after timeout |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 200ms timeout, no PFI/PFO, no watchdog output - only RESET and MR | Lacks power-fail warning and independent watchdog signaling; suitable only for basic reset-only use cases | Choose TPS3808G33DBVR only when PFI/PFO and WDO functions are unnecessary and 3.3V threshold suffices |
Compared with MAX6706LKA+T, MAX6706AKA+T offers identical functionality with improved WDO responsiveness during recovery, while TPS3808G33DBVR sacrifices power-fail monitoring and watchdog signaling for lower cost and simpler integration in non-critical applications.
Availability
MAX6706LKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecommunications equipment, intelligent instruments, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6706LKA+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) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX6701–MAX6708 family was engineered specifically for robust, low-component-count microprocessor supervision in space-constrained, high-reliability systems requiring multi-function monitoring (reset, watchdog, power-fail warning) in a single SOT23 package.
FAQ
What is the exact reset threshold voltage for MAX6706LKA+T?
The MAX6706LKA+T has a factory-trimmed reset threshold of 4.63V (L-suffix), specified with ±3% tolerance over the full -40°C to +125°C operating range. This value is guaranteed in the Electrical Characteristics table and applies to VCC falling conditions. The threshold remains stable due to a low 60ppm/°C temperature coefficient, making it suitable for precision +5V system supervision.
Does MAX6706LKA+T provide an active-high or active-low reset output?
The MAX6706LKA+T provides an active-high push-pull RESET output - meaning RESET goes high (to VCC) when the supply is valid and drops low only during reset assertion. This is confirmed by the "MAX6706(A)" row in the Pin Description table and the "Active-High Reset Output (Push-Pull)" designation in the datasheet. It eliminates the need for an external pull-up resistor and directly interfaces with µP reset pins requiring active-high logic.
How does the watchdog timer in MAX6706LKA+T operate, and what is its timeout period?
The MAX6706LKA+T watchdog timer requires a WDI edge transition at least every 1.6s (typical) to remain cleared. If no transition occurs, WDO is asserted low. As an A-version device, WDO deasserts immediately upon VCC recovery above threshold or a valid WDI edge - unlike non-A versions which require a timeout delay. This behavior is documented in the Standard- vs. A-Version Comparison section and enables faster fault recovery.
Can MAX6706LKA+T monitor a secondary supply voltage such as 3.3V or 2.5V?
Yes - MAX6706LKA+T includes a dedicated PFI input with a 0.62V internal reference, allowing precise monitoring of secondary supplies. By connecting PFI to a resistor divider from the target rail (e.g., 3.3V), the trip point is set using the formula VEXT-TH = (1 + R1/R2) × 0.62V. The resulting PFO output provides an early-warning interrupt before the rail collapses, as shown in Figure 10 of the datasheet.
What package type and RoHS status does MAX6706LKA+T use?
MAX6706LKA+T is supplied in an 8-pin SOT23 package (outline 21-0078, land pattern 90-0176), with gull-wing leads and lead-free (RoHS-compliant) finish. The "+T" suffix explicitly denotes lead-free tape-and-reel packaging, per Maxim's ordering guide. The device is rated for -40°C to +125°C operation and has a maximum continuous power dissipation of 714mW at +70°C.
MAX6706LKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.63V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6706LKA+T FAQ
1.How can I place an order for MAX6706LKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706LKA+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 MAX6706LKA+T reliable?
The price and inventory of MAX6706LKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706LKA+T is usually 5 days.
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MAX6706LKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706LKA+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 MAX6706LKA+T?
For technical support, including MAX6706LKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706LKA+T requirements.
6.How does Aetrix verify that MAX6706LKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6706LKA+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 MAX6706LKA+T meets industry standards.
7.What is the process for return or replacement of MAX6706LKA+T?
All MAX6706LKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706LKA+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 MAX6706LKA+T part is unused and in its original packaging.
Return procedure for MAX6706LKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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