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Analog Devices Inc./Maxim Integrated MAX706CUA
- Part No.:
- MAX706CUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706CUA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:422
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Product details
Overview
The MAX706CUA from Maxim Integrated is a microprocessor supervisory circuit providing active-low reset, watchdog timeout detection, power-fail warning, and manual-reset input in an 8-pin µMAX package. It asserts reset when VCC drops below 4.40V, delivers a guaranteed 200ms reset pulse width, and monitors PFI at 1.25V threshold-used for battery-low detection or auxiliary supply monitoring in embedded control systems.
For engineers reviewing the MAX706CUA datasheet, MAX706CUA pinout, MAX706CUA application, or MAX706CUA equivalent, this device serves as a precision voltage-monitoring and system-reliability IC for 5V µP systems requiring brownout protection, fail-safe reset timing, and low-power supervision with VCC down to 1.0V.
Technical Context
The MAX706CUA integrates a precision 4.40V reset threshold comparator with 40mV hysteresis, a 1.6s watchdog timer with edge-sensitive WDI input (50ns minimum pulse width), and a dedicated 1.25V power-fail comparator feeding open-drain PFO. Its internal 250µA MR pull-up enables TTL/CMOS-compatible manual reset triggering without external components.
All outputs-RESET, WDO, and PFO-are open-drain with guaranteed sink capability (3.2mA for RESET, 1.2mA for WDO/PFO) and logic-level compatibility across VCC = 1.0V to 5.5V. The device operates over 0°C to +70°C and draws only 150–350µA quiescent current in normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±2.5% - triggers reliable power-down/brownout reset for +5V systems |
| Reset Pulse Width | 200ms typical - ensures µP initialization completes before release |
| Watchdog Timeout | 1.6s ±40% - detects firmware lockup without requiring software intervention |
| PFI Threshold | 1.25V ±4% - enables accurate low-battery or secondary supply monitoring |
| Supply Voltage Range | 1.0V to 5.5V - guarantees RESET validity even during deep brownout |
| Quiescent Current | 150–350µA - supports long-life battery-backed applications |
| MR Input Pull-Up | 250µA internal - eliminates need for external pull-up resistor |
Pinout & Package
MAX706CUA is housed in an 8-pin µMAX package (2.1mm × 2.1mm, 0.5mm pitch), RoHS-compliant, with exposed pad for thermal enhancement. Pin 1 is WDO; pin 2 is RESET; pin 3 is WDI; pin 4 is PFO; pin 5 is PFI; pin 6 is GND; pin 7 is VCC; pin 8 is MR.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WDO) | Watchdog Output | Open-drain output pulled low on timeout or VCC brownout; no minimum pulse width |
| 2 (RESET) | Active-Low Reset Output | Guaranteed logic-low (≤0.4V) for ≥200ms; valid down to VCC = 1.0V |
| 3 (WDI) | Watchdog Input | Edge-triggered; toggling required every 1.6s; floating disables watchdog |
| 4 (PFO) | Power-Fail Output | Open-drain output low when PFI < 1.25V; used for early-warning interrupt |
| 5 (PFI) | Power-Fail Input | High-impedance comparator input referenced to 1.25V internal bandgap |
| 6 (GND) | Ground Reference | Common return for all analog and digital functions; connects to PCB ground plane |
| 7 (VCC) | Supply Input | Accepts 1.0–5.5V; powers internal comparators, timer, and output drivers |
| 8 (MR) | Manual-Reset Input | Active-low; internally pulled up at 250µA; debounced by 200ms reset pulse |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Valid at VCC = 1V | Ensures fail-safe reset assertion during severe brownout, critical for data retention |
| Debounced Manual-Reset Input | 140–280ms minimum pulse width eliminates switch bounce without external RC |
| Independent Power-Fail Comparator | Uncommitted PFI/PFO pins allow flexible monitoring of non-5V rails or negative supplies |
| Watchdog Timer with Edge Detection | Detects 50ns WDI pulses-robust against noise and compatible with fast µP GPIO |
| µMAX Package (2.1mm × 2.1mm) | Reduces board area by >70% vs. SO-8; suitable for space-constrained industrial controllers |
Applications
| Industrial PLC Controller | Medical Infusion Pump |
|---|---|
|
Use Scenario: Real-time motor control and safety-critical dose delivery under variable AC line conditions. IC Role / Device Role / Timing Role: Supervises 5V logic rail and monitors backup battery voltage via PFI; asserts RESET on brownout and triggers orderly shutdown via PFO interrupt. Use Value: Prevents erratic actuator movement during undervoltage events; meets IEC 62304 Class C software safety requirements. |
Use Scenario: Battery-powered portable device requiring >10-year shelf life and fault-tolerant power sequencing. IC Role / Device Role / Timing Role: Provides VCC-monitored reset and low-battery warning (PFI tied to battery divider); WDI fed by watchdog task in RTOS. Use Value: Guarantees safe stop on battery depletion; 150µA supply current extends operational runtime between charges. |
| Automotive Body Control Module | Point-of-Sale Terminal |
|
Use Scenario: 12V-to-5V converted system exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Monitors post-regulator 5V rail with 4.40V threshold; uses MR for service-mode entry; PFO alerts µP before main supply collapse. Use Value: Survives ISO 7637-2 Pulse 4 (cold crank) down to 2.5V input; avoids false resets during transient dips. |
Use Scenario: Compact retail terminal with EEPROM-based configuration storage and USB host interface. IC Role / Device Role / Timing Role: Generates clean 200ms reset pulse on power-up; watches firmware execution via WDI; flags power-fail to save transaction state. Use Value: Eliminates corrupted flash writes during unexpected AC loss; supports EN 61000-4-11 immunity testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CSA | Same electrical specs, but in 8-pin SO package (3.9mm × 4.9mm) | Larger footprint; better thermal dissipation; standard surface-mount reflow profile | Select when board layout allows SO-8 and thermal margin >100mW is needed. |
| MAX706CPA | Identical function and specs, in 8-pin PDIP package (9.27mm × 6.35mm) | Through-hole mounting; suited for prototyping, legacy repair, or high-vibration environments | Choose for hand-soldered assemblies, test fixtures, or MIL-STD-202 vibration compliance. |
Compared with MAX706CUA, the MAX706CSA offers greater thermal mass and standard SMT compatibility, while MAX706CPA provides mechanical robustness and ease of replacement-both retain identical supervision functionality but trade µMAX's size advantage for package-specific mechanical or process benefits.
Availability
MAX706CUA is available at Aetrix Electronics and suitable for industrial controllers, medical devices, automotive body electronics, and point-of-sale terminals requiring stable component supply and long-term production continuity.
Supply support for MAX706CUA 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, communications, and computing markets, with emphasis on reliability and integration.
The MAX705–MAX708 family was engineered specifically for cost-sensitive, space-constrained microprocessor systems needing guaranteed reset timing, watchdog safety, and multi-rail monitoring-without external passive components.
FAQ
What is the reset threshold voltage for MAX706CUA?
The MAX706CUA has a nominal reset threshold of 4.40V with ±2.5% tolerance (4.25V to 4.50V). This value is factory-trimmed and guaranteed over temperature (0°C to +70°C) and supply range. It differs from the MAX705CUA (4.65V) and is optimized for systems where tighter regulation of the 5V rail is required before asserting reset.
Does MAX706CUA provide an active-high reset output?
No, the MAX706CUA provides only an active-low RESET output (pin 2). Active-high reset is available in the MAX707/MAX708 series and MAX813L. For applications requiring both polarities, MAX707CUA or MAX708CUA must be selected-MAX706CUA does not include the complementary RESET output.
Can MAX706CUA monitor a 3.3V supply?
Yes-by connecting the 3.3V rail to PFI through a resistive divider that scales it to ≤1.25V, the MAX706CUA can generate a power-fail warning. For example, a 100kΩ/200kΩ divider reduces 3.3V to 1.10V, triggering PFO when the input falls below ~1.05V (accounting for 1.25V threshold tolerance). No additional ICs are needed.
What is the minimum pulse width for the manual-reset input (MR) on MAX706CUA?
The MAX706CUA requires a minimum MR low pulse width of 150ns to guarantee reset assertion. This is specified in the Electrical Characteristics table under "MR Pulse Width (tMR)". The internal 250µA pull-up ensures reliable release after switch release, and the resulting RESET pulse is guaranteed ≥140ms-effectively debouncing mechanical switches.
Is the watchdog timer in MAX706CUA disabled when WDI is left floating?
Yes-the MAX706CUA watchdog timer is automatically disabled when WDI is floating or connected to a high-impedance (three-state) node. In this state, WDO remains high unless VCC drops below the reset threshold. This behavior allows safe use of WDO as a low-line indicator without firmware overhead.
MAX706CUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX706CUA FAQ
1.How can I place an order for MAX706CUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706CUA 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 MAX706CUA reliable?
The price and inventory of MAX706CUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706CUA is usually 5 days.
3.What payment methods are accepted for MAX706CUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706CUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706CUA?
MAX706CUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706CUA 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 MAX706CUA?
For technical support, including MAX706CUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706CUA requirements.
6.How does Aetrix verify that MAX706CUA is sourced from the original manufacturer or authorized distributors?
All MAX706CUA 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 MAX706CUA meets industry standards.
7.What is the process for return or replacement of MAX706CUA?
All MAX706CUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706CUA, 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 MAX706CUA part is unused and in its original packaging.
Return procedure for MAX706CUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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