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Analog Devices Inc./Maxim Integrated MAX6706ALKA+T
- Part No.:
- MAX6706ALKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6706ALKA+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6706ALKA+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 adjustable power-fail comparator (PFI/PFO), manual reset input (MR), and a 1.6s watchdog timer with independent WDO output. It operates across -40°C to +125°C and guarantees valid reset down to VCC = 1V, targeting critical µP power monitoring in industrial controllers and telecom infrastructure.
For engineers reviewing the MAX6706ALKA+T datasheet, MAX6706ALKA+T pinout, MAX6706ALKA+T application, or MAX6706ALKA+T equivalent, this device delivers precise single-supply supervision with active-high reset, integrated watchdog timing, and power-fail warning capability - key for reliable boot sequencing and brownout recovery in embedded systems.
Technical Context
The MAX6706ALKA+T implements a dedicated reset generator with internal 0.62V reference for PFI threshold detection and uses a precision bandgap-based voltage monitor for VCC supervision. Its watchdog circuit clears on any WDI edge and asserts WDO low after 1.6s timeout, while reset assertion is triggered by VCC falling below the selected threshold (e.g., 3.08V for suffix 'T'), MR pull-down, or PFI undervoltage.
Reset output remains asserted for a guaranteed 140–300ms timeout after fault clearance, and the active-high push-pull RESET output is valid down to VCC = 1V. The device supports external resistor-divider configuration for PFI trip point and includes 50kΩ internal MR pullup, enabling direct pushbutton interfacing without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Polarity | Active-high push-pull - drives high during normal operation; eliminates need for external pullup resistor. |
| Reset Timeout Period | 140ms (min) at -40°C to +85°C - ensures sufficient hold time for µP initialization before release. |
| Watchdog Timeout | 1.6s (typ) - provides robust software activity monitoring with tolerance for brief execution stalls. |
| VCC Reset Threshold | 3.08V (typ) for 'T' suffix - precisely matches +3.3V supply monitoring with ±3% accuracy over temperature. |
| PFI Threshold Voltage | 0.62V (typ), 6mV hysteresis - enables accurate power-fail warning via external resistive divider on any system rail. |
| Supply Current | 9µA (typ) at VCC < 3.6V - ultra-low quiescent current preserves battery life in always-on monitoring applications. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive, industrial control, and telecom base station environments. |
Pinout & Package
MAX6706ALKA+T is housed in an 8-pin SOT23 package (package code K8+2), with 0.65mm pitch, 2.9mm × 1.6mm footprint, and thermal pad not present. Pin 1 is MR, Pin 2 is VCC, Pin 3 is GND, Pin 4 is PFI, Pin 5 is PFO, Pin 6 is WDI, Pin 7 is RESET (active-high), and Pin 8 is WDO.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | CMOS-compatible input with 50kΩ internal pullup; pulling low forces immediate reset assertion for 140ms after release. |
| 2 - VCC | Main supply input and primary reset monitor | Power source for internal circuitry and reference; reset triggers when VCC falls below 3.08V (T-suffix). |
| 3 - GND | Analog/digital ground reference | Common return path for all internal comparators, timers, and output drivers; must be low-impedance. |
| 4 - PFI | Power-fail input | High-impedance (±200nA leakage) comparator input referenced to 0.62V; sets early warning threshold via external divider. |
| 5 - PFO | Power-fail output | Active-low push-pull output asserting when PFI < 0.62V; directly interfaces µP interrupt or secondary supervisor. |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising or falling edge resets 1.6s watchdog timer; pulses as short as 50ns are detected. |
| 7 - RESET | Active-high reset output | Push-pull driver sourcing up to 500µA at VCC ≥ 2.7V; valid logic high down to VCC = 1V. |
| 8 - WDO | Watchdog output | Active-low push-pull output asserting on watchdog timeout or VCC/RST_IN undervoltage; deasserts on WDI edge or MR low. |
Key Features
| Feature | Design Value |
|---|---|
| Active-high push-pull RESET | Eliminates external pullup resistor, reduces BOM count, and ensures deterministic high-state drive during normal operation. |
| Independent PFI/PFO comparator | Enables early power-fail warning on any system rail (e.g., 5V, 3.3V, 2.5V) using only two external resistors - no additional IC required. |
| 1.6s watchdog timeout with edge-triggered clear | Prevents false resets from noise or jitter; allows flexible software polling intervals while maintaining safety-critical supervision. |
| Guaranteed reset validity to VCC = 1V | Ensures clean reset assertion during deep brownout or battery sag conditions where other supervisors fail. |
| Immunity to short VCC transients | Rejects sub-20µs supply glitches (per MAX6701 toc06), preventing spurious resets in noisy power environments. |
Applications
| Industrial Controllers | Telecom Power Management |
|---|---|
Use Scenario: PLC and RTU modules requiring reliable boot-up and brownout recovery in variable AC/DC supply environments. IC Role / Device Role / Timing Role: Primary µP supervisor providing active-high reset, watchdog supervision, and auxiliary 3.3V rail monitoring via PFI. Use Value: Guarantees µP enters known state even during 100ms line sags; PFO interrupt enables graceful shutdown before main rail collapse. |
Use Scenario: Base station power sequencers managing multiple DC-DC converters and FPGA configuration. IC Role / Device Role / Timing Role: Single-rail supervisor for +3.3V I/O supply with independent PFO warning of upstream 48V converter degradation. Use Value: 0.62V PFI threshold allows precise 48V-to-3.3V divider setup; 140ms reset timeout aligns with FPGA configuration clock requirements. |
| Critical µP Power Monitoring | White Goods Control Boards |
Use Scenario: Medical diagnostic equipment where firmware integrity and deterministic restart are safety-critical. IC Role / Device Role / Timing Role: Supervises main +3.3V supply and feeds WDO to NMI input for watchdog-triggered exception handling. Use Value: Independent WDO output enables non-maskable interrupt generation without affecting reset timing - essential for ISO 13485 compliance. |
Use Scenario: Smart appliance main control boards exposed to wide ambient temperature swings (-25°C to +70°C). IC Role / Device Role / Timing Role: Monitors +5V microcontroller supply and provides MR interface for door-open reset and PFO for motor-driver undervoltage warning. Use Value: -40°C to +125°C rating ensures operation in sealed enclosures; 50kΩ internal MR pullup simplifies front-panel button design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6706LKA+T | 4.63V reset threshold (L-suffix) vs. 3.08V (T-suffix); same pinout, timing, and feature set. | Designed for +5.0V supply monitoring instead of +3.3V; unsuitable for 3.3V systems without redesign. | Select only if supervising 5V rails; verify VCC range compatibility and PFI divider scaling. |
| MAX6316US31D3+T | Single-supply supervisor with 3.08V threshold, no watchdog or PFI/PFO; SOT23-5 package (5 pins, no WDI/WDO/PFI/PFO). | Lacks power-fail warning and watchdog functionality; suitable only for basic reset-only applications. | Choose when cost and board space are critical and watchdog/PFI features are unnecessary. |
Compared with MAX6706LKA+T and MAX6316US31D3+T, the MAX6706ALKA+T uniquely combines +3.3V-specific reset threshold, active-high push-pull output, full watchdog timing, and independent PFI/PFO - making it the only option among the three that satisfies complete supervision requirements for modern 3.3V µP systems.
Availability
MAX6706ALKA+T is available at Aetrix Electronics and suitable for industrial controllers, telecom power management, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6706ALKA+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 industrial, automotive, communications, and computing applications.
The MAX6701–MAX6708 family delivers compact, low-power µP supervision with integrated watchdog, power-fail warning, and multi-threshold options - engineered specifically for reliability-critical embedded systems demanding guaranteed reset behavior across harsh environments.
FAQ
What is the reset threshold voltage for MAX6706ALKA+T?
The MAX6706ALKA+T has a nominal VCC reset threshold of 3.08V (T-suffix), with guaranteed range of 2.97V to 3.17V over -40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under "VTH" for MAX670_T/MAX670_AT versions. The threshold applies to the VCC pin and determines when the active-high RESET output is asserted during power-down or brownout.
Does MAX6706ALKA+T support active-high reset output?
Yes, the MAX6706ALKA+T provides an active-high push-pull RESET output (Pin 7), as confirmed in the Pin Description table and Selector Guide. Unlike open-drain or active-low variants, this version drives high during normal operation and pulls low only during reset assertion - eliminating the need for an external pullup resistor and simplifying interface with µP reset inputs expecting high-active logic.
How does the watchdog timer function in MAX6706ALKA+T?
The MAX6706ALKA+T watchdog timer times out after 1.6s (typical) if no edge is detected on WDI (Pin 6). Upon timeout, WDO (Pin 8) goes low and remains low until cleared by a WDI edge or MR low pulse. The timer resets automatically on any VCC reset assertion, MR activation, or WDI transition - ensuring robust software supervision without lockup risk.
Can MAX6706ALKA+T monitor voltages other than VCC?
Yes, the MAX6706ALKA+T includes a dedicated PFI (Pin 4) input referenced to an internal 0.62V comparator, allowing monitoring of any system voltage via an external resistive divider. For example, a 48V rail can be scaled to 0.62V using R1/R2 = 77.9:1, triggering PFO (Pin 5) to warn of impending failure before the main VCC drops.
What is the operating temperature range for MAX6706ALKA+T?
The MAX6706ALKA+T is rated for -40°C to +125°C operation, as stated in the Ordering Information table and Absolute Maximum Ratings. This extended industrial temperature grade enables use in under-hood automotive modules, industrial PLCs, and telecom base stations where ambient temperatures exceed commercial-grade limits.
MAX6706ALKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- 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
MAX6706ALKA+T FAQ
1.How can I place an order for MAX6706ALKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6706ALKA+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 MAX6706ALKA+T reliable?
The price and inventory of MAX6706ALKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6706ALKA+T is usually 5 days.
3.What payment methods are accepted for MAX6706ALKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6706ALKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6706ALKA+T?
MAX6706ALKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6706ALKA+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 MAX6706ALKA+T?
For technical support, including MAX6706ALKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6706ALKA+T requirements.
6.How does Aetrix verify that MAX6706ALKA+T is sourced from the original manufacturer or authorized distributors?
All MAX6706ALKA+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 MAX6706ALKA+T meets industry standards.
7.What is the process for return or replacement of MAX6706ALKA+T?
All MAX6706ALKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6706ALKA+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 MAX6706ALKA+T part is unused and in its original packaging.
Return procedure for MAX6706ALKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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