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Analog Devices Inc./Maxim Integrated MAX706TCUA+
- Part No.:
- MAX706TCUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706TCUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
MAX706TCUA+ from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing reset generation (3.08V threshold), watchdog timer (1.6s timeout), power-fail warning (1.25V comparator), and manual-reset input for +3V/+3.3V systems. It ensures reliable boot-up and brownout recovery in portable instruments and battery-powered controllers.
For engineers reviewing the MAX706TCUA+ datasheet, MAX706TCUA+ pinout, MAX706TCUA+ application, or MAX706TCUA+ equivalent, this page delivers verified electrical specs, functional role in µP power monitoring, watchdog behavior under tri-state WDI, and precise reset timing across VCC = 1.0V to 5.5V.
Technical Context
The MAX706TCUA+ integrates a precision voltage monitor with 3.08V reset threshold (±1.5% tolerance), a 1.6s watchdog timer that resets on WDI edge transitions and disables when WDI is open/high-Z (≤600nA leakage), and a 1.25V reference-based PFI/PFO comparator for external supply monitoring. Its RESET output asserts low for ≥200ms after VCC rises above threshold or MR deasserts.
It operates across VCC = 3.15V to 5.5V, draws only 100µA quiescent current, guarantees RESET assertion down to VCC = 1V, and features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V. The µMAX package enables high-density PCB layouts in space-constrained embedded designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V (VCC falling); ensures reset assertion before 3.3V µP brownout |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and clock stabilization |
| Watchdog Timeout | 1.6s ±40%; detects µP lockup without requiring software servicing |
| Quiescent Current | 100µA max at VCC = 3.3V; extends battery life in portable equipment |
| Supply Voltage Range | 3.15V to 5.5V; supports dual-supply operation with 3.3V logic and 5V peripherals |
| PFI Threshold | 1.25V ±40mV; enables accurate power-fail warning for unregulated rails via resistive divider |
| MR Input Compatibility | TTL/CMOS; allows direct interface with pushbutton switches or logic outputs without level-shifting |
Pinout & Package
MAX706TCUA+ uses an 8-pin µMAX package (U8-1), 3mm × 3mm, exposed pad, lead-free compatible, rated for 0°C to +70°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Debounced by internal 140ms minimum pulse width; pulls up internally with 70µA current |
| 2 (VCC) | Positive supply input | Accepts 3.15V–5.5V; powers all internal circuits including reset generator and watchdog |
| 3 (GND) | Ground reference | Common return path for all analog and digital functions; must be low-impedance |
| 4 (PFI) | Power-fail comparator input | Compares external voltage against 1.25V reference; used for battery-low or unregulated rail monitoring |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; can interrupt µP or trigger backup power switchover |
| 6 (WDO) | Active-low watchdog output | Goes low if WDI not toggled within 1.6s; also asserts during VCC brownout |
| 7 (RESET) | Active-low reset output | Asserts low when VCC < 3.08V or MR low; holds for ≥200ms after recovery |
| 8 (NC) | No connection | Not internally bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset state even during deep brownout or battery sag |
| WDI disable on high-impedance state | Watchdog automatically disables when WDI floats or connects to tri-state I/O (<600nA leakage) |
| 200ms reset time delay | Matches typical µP reset timing requirements without external RC components |
| 1.25V precision PFI threshold | Enables accurate power-fail detection across temperature with minimal external parts |
| 100µA quiescent current | Reduces standby power consumption in always-on battery-backed systems |
Applications
| Battery-Powered Instrumentation | Portable Data Logger |
|---|---|
Use Scenario: Handheld multimeter powered by two AA cells with optional USB charging. IC Role / Device Role / Timing Role: Supervisory IC monitors main 3.3V rail and triggers reset if battery drops below 3.08V; PFI monitors unregulated battery voltage for low-battery warning. Use Value: Prevents corrupted measurements during brownout and enables graceful shutdown before data loss. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 seconds. IC Role / Device Role / Timing Role: MAX706TCUA+ asserts RESET on power-up and watches µP activity via WDI; PFO interrupts µP when solar-charged battery falls below safe operating voltage. Use Value: Guarantees clean boot sequence and prevents firmware hang during intermittent power conditions. |
| Industrial Controller HMI | Medical Point-of-Care Device |
Use Scenario: Touchscreen-based PLC interface with 3.3V logic and 24V field I/O. IC Role / Device Role / Timing Role: Provides system-level reset coordination between µP and FPGA; MR input accepts front-panel reset button press. Use Value: Eliminates need for discrete RC reset networks and simplifies BOM while meeting IEC 61000-4-2 immunity requirements. |
Use Scenario: Portable blood glucose meter with LCD, Bluetooth, and disposable test-strip interface. IC Role / Device Role / Timing Role: Monitors 3.3V supply derived from coin-cell battery; RESET ensures consistent boot state; PFO warns of end-of-battery-life before first-use calibration fails. Use Value: Meets FDA design controls for deterministic power-on behavior and battery depletion management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCUA+ | 2.93V reset threshold; otherwise identical pinout, timing, and feature set | Better suited for systems where 3.3V rail tolerances require earlier reset assertion | Select when VCC nominal is 3.3V with tighter dropout margin (e.g., LDO with 150mV dropout) |
| TPS3808G30DBVR | 3.0V reset threshold; 350ms reset delay; no integrated watchdog; 1.8µA IQ | Lacks watchdog function but offers ultra-low quiescent current for multi-year battery life | Choose when watchdog is unnecessary and standby current is critical (e.g., wireless sensor nodes) |
Compared with MAX706SCUA+, MAX706TCUA+ delays reset assertion until VCC drops lower-improving noise immunity in noisy industrial environments. Against TPS3808G30DBVR, MAX706TCUA+ trades higher IQ for integrated watchdog and PFI/PFO functionality, reducing component count in µP-centric designs.
Availability
MAX706TCUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data loggers, and industrial controller HMIs requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for MAX706TCUA+ 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 power management, sensing, and interface applications in industrial, medical, and communications systems.
The MAX706 family delivers cost-effective, integrated µP supervision for +3V systems-combining reset, watchdog, and power-fail monitoring in a single 8-pin package to reduce board area and improve reliability.
FAQ
What is the reset threshold voltage for MAX706TCUA+?
The MAX706TCUA+ has a guaranteed reset threshold of 3.08V (VCC falling), with ±1.5% tolerance over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table. The device asserts its active-low RESET output whenever VCC drops below this threshold and holds it asserted for at least 200ms after VCC recovers above 3.08V. This threshold is fixed and cannot be adjusted externally.
Does MAX706TCUA+ include a watchdog timer, and how does it behave?
Yes, MAX706TCUA+ includes a 1.6s watchdog timer that monitors the WDI input. If no rising or falling edge occurs at WDI within 1.6s, WDO goes low. The timer resets on any WDI transition or during RESET assertion. Crucially, the watchdog function disables automatically when WDI is left open or connected to a high-impedance tri-state output with leakage <600nA-eliminating false timeouts during µP sleep modes.
Can MAX706TCUA+ monitor a power supply other than VCC?
Yes, MAX706TCUA+ includes a dedicated PFI (Power-Fail Input) pin referenced to an internal 1.25V comparator. By connecting PFI to a resistive divider from an unregulated DC rail (e.g., battery or AC-DC output), the device generates an active-low PFO signal when that rail falls below the trip point. This enables independent monitoring of backup supplies, analog rails, or negative voltages using external resistor networks.
What is the minimum VCC required for MAX706TCUA+ to guarantee RESET assertion?
MAX706TCUA+ guarantees RESET output assertion (low state) down to VCC = 1.0V at 0°C to +70°C. Below 1.0V, the RESET driver enters high-impedance mode. This specification ensures robust reset behavior during deep brownout or battery discharge, allowing µPs to enter known-safe states before complete power collapse. The 1.0V guarantee is validated across temperature and process corners.
Is MAX706TCUA+ pin-compatible with other MAX706 variants?
Yes, MAX706TCUA+ is fully pin-compatible with all MAX706x variants in the µMAX package (U8-1), including MAX706PCUA+, MAX706RCUA+, MAX706SCUA+, and MAX706APCUA+. All share identical pinout, package dimensions, thermal characteristics, and electrical interface-only the reset threshold (2.63V, 2.93V, 3.08V, or active-high variants) and watchdog enable behavior differ. No PCB layout change is needed when substituting within the same package type.
MAX706TCUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX706TCUA+ FAQ
1.How can I place an order for MAX706TCUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706TCUA+ 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 MAX706TCUA+ reliable?
The price and inventory of MAX706TCUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706TCUA+ is usually 5 days.
3.What payment methods are accepted for MAX706TCUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706TCUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706TCUA+?
MAX706TCUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706TCUA+ 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 MAX706TCUA+?
For technical support, including MAX706TCUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706TCUA+ requirements.
6.How does Aetrix verify that MAX706TCUA+ is sourced from the original manufacturer or authorized distributors?
All MAX706TCUA+ 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 MAX706TCUA+ meets industry standards.
7.What is the process for return or replacement of MAX706TCUA+?
All MAX706TCUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706TCUA+, 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 MAX706TCUA+ part is unused and in its original packaging.
Return procedure for MAX706TCUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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