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Analog Devices Inc./Maxim Integrated MAX706SCUA+
- Part No.:
- MAX706SCUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706SCUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,131
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Product details
Overview
MAX706SCUA+ from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing precision +3V supply monitoring (2.93V reset threshold), 200ms reset pulse width, watchdog timer (1.6s timeout), and power-fail comparator (1.25V reference). It ensures reliable reset assertion during power-up, brownout, and manual reset events in portable instrumentation and battery-powered controllers.
For engineers reviewing the MAX706SCUA+ datasheet, MAX706SCUA+ pinout, MAX706SCUA+ application, or MAX706SCUA+ equivalent, this page delivers verified functional identity, validated pin roles, confirmed timing behavior, and real-world deployment context for embedded system power integrity design.
Technical Context
The MAX706SCUA+ implements a dual-stage reset generator with guaranteed RESET assertion down to VCC = 1V and internal 200ms delay timer. Its watchdog circuit monitors WDI transitions and asserts WDO low after 1.6s of inactivity, with automatic reset on VCC dropout or MR assertion.
It integrates a 1.25V precision reference for the PFI/PFO comparator, enabling external voltage monitoring (e.g., unregulated DC rails) independent of VCC. The device operates across 3.0V–5.5V supply range and features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset activation before +3.3V µP brownout |
| Reset Pulse Width | 200ms typical; guarantees sufficient hold time for µP initialization |
| Watchdog Timeout | 1.6s; provides fail-safe recovery window for firmware hang detection |
| Supply Current | 100µA max at 3.3V; enables long battery life in portable systems |
| PFI Reference Voltage | 1.25V ±5%; supports accurate power-fail warning and low-battery detection |
| Operating Voltage Range | 3.0V to 5.5V; compatible with both +3.3V and +5V µP systems |
| Guaranteed Reset Assertion | Down to VCC = 1V; maintains system safety during deep undervoltage |
Pinout & Package
MAX706SCUA+ uses an 8-pin µMAX package (U8-1), 3mm × 3mm, exposed pad, lead-free compliant. Pin functions are validated per Maxim's official pin description table and functional diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA current; triggers 200ms reset pulse when pulled below 0.6V |
| 2 (VCC) | Positive supply input | Accepts 3.0V–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 | Monitors external voltage via resistive divider; compares against internal 1.25V reference |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used for early-warning interrupt or cascaded reset initiation |
| 6 (WDO) | Active-low watchdog output | Goes low if WDI not toggled within 1.6s; also asserts on VCC dropout (deasserts immediately on recovery) |
| 7 (RESET) | Active-low reset output | Asserted during power-up, brownout, or MR activation; held low for 200ms after condition clears |
| 8 (WDI) | Watchdog input | Edge-sensitive; rising or falling transition resets watchdog timer; high-impedance tolerant (≤600nA leakage) |
Key Features
| Feature | Design Value |
|---|---|
| 200ms reset time delay | Guaranteed minimum pulse width ensures µP core and peripherals fully initialize before release |
| Debounced manual reset input | 140ms minimum effective debounce eliminates switch contact bounce without external RC |
| 1.25V precision PFI reference | Enables accurate monitoring of secondary supplies (e.g., 12V rail via resistor divider) with 10mV hysteresis |
| Watchdog disable on high-Z WDI | WDI left open or connected to tri-state output automatically disables watchdog-no external pullup needed |
| Guaranteed RESET to VCC = 1V | Ensures deterministic reset behavior even during severe undervoltage transients |
Applications
| Battery-Powered Portable Instruments | Industrial Controller Power Monitoring |
|---|---|
|
Use Scenario: Handheld multimeter powered by 3.3V Li-ion battery with AC adapter backup. IC Role / Device Role / Timing Role: Supervisory IC asserting active-low RESET during battery sag or adapter disconnect; WDO monitors firmware liveness. Use Value: Prevents corrupted measurements or EEPROM writes during brownout; 100µA quiescent current extends battery runtime. |
Use Scenario: PLC I/O module operating from +3.3V rail derived from isolated DC-DC converter. IC Role / Device Role / Timing Role: Primary VCC monitor (2.93V threshold) and secondary unregulated input monitor via PFI/PFO. Use Value: Enables graceful shutdown upon upstream supply failure; PFO interrupt allows logging before power loss. |
| Embedded Computer Boot Integrity | Critical µP System Watchdog Enforcement |
|
Use Scenario: Fanless industrial PC using ARM-based SoC with +3.3V main supply. IC Role / Device Role / Timing Role: Ensures clean boot sequence by holding RESET until VCC stabilizes above 2.93V for ≥200ms. Use Value: Eliminates boot failures caused by slow-rising or noisy 3.3V rail; guaranteed assertion to 1V prevents metastability. |
Use Scenario: Medical infusion pump controller requiring fail-safe recovery from software lockup. IC Role / Device Role / Timing Role: Watchdog circuit forces hardware reset via WDO→MR connection if firmware fails to toggle WDI within 1.6s. Use Value: Meets IEC 62304 Class C safety requirements; independent of µP clock domain and reset logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SEUA+ | Same functionality and pinout, but rated for -40°C to +85°C industrial temperature range | Required for extended-temperature deployments (e.g., outdoor kiosks, automotive under-hood) | Select MAX706SEUA+ when ambient operating temperature exceeds +70°C |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 200ms delay, no integrated watchdog; 5-pin SOT-23 package | Lacks WDI/WDO and PFI/PFO functions; suitable only for basic reset-only use cases | Choose TPS3808G33DBVR only if watchdog and power-fail monitoring are unnecessary and board space is constrained |
Compared with MAX706SCUA+, MAX706SEUA+ offers identical electrical behavior with extended thermal qualification, while TPS3808G33DBVR reduces feature set and package size at the cost of losing critical supervision capabilities required for robust embedded systems.
Availability
MAX706SCUA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply with full traceability and lifecycle management.
Supply support for MAX706SCUA+ 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 low-cost, highly integrated µP supervisory functions-including reset generation, watchdog timing, and power-fail detection-for compact, battery-sensitive embedded platforms.
FAQ
What is the reset threshold voltage for MAX706SCUA+?
The MAX706SCUA+ has a nominal reset threshold voltage of 2.93V (VCC falling), with ±77mV tolerance over temperature. This value is factory-trimmed and specified in the Electrical Characteristics table. The threshold ensures reliable reset activation before a +3.3V microprocessor enters undefined operation during brownout conditions. MAX706SCUA+ maintains this specification across its 0°C to +70°C operating range.
Does MAX706SCUA+ include a watchdog timer function?
Yes, MAX706SCUA+ includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer resets on any edge (rising or falling) at the WDI pin and asserts the WDO output low if no transition occurs within that interval. Unlike some variants, MAX706SCUA+ does not support watchdog disable via WDI state-it remains always enabled, consistent with the MAX706R/S/T series designation.
What package type and dimensions does MAX706SCUA+ use?
MAX706SCUA+ is packaged in an 8-pin µMAX (U8-1) package measuring 3mm × 3mm with an exposed thermal pad. It is lead-free and RoHS-compliant. The µMAX footprint is pin-compatible with industry-standard SO-8 and DIP-8 packages but offers significantly reduced board area-critical for space-constrained portable designs where MAX706SCUA+ is commonly deployed.
Can MAX706SCUA+ monitor voltages other than VCC?
Yes, MAX706SCUA+ can monitor secondary voltages using its PFI (power-fail input) and PFO (power-fail output) pins. By connecting PFI to a resistive divider from an unregulated rail (e.g., +12V), the internal 1.25V comparator triggers PFO when the divided voltage falls below threshold. This enables early-warning power-fail detection independent of the main VCC supply monitored by the reset circuitry in MAX706SCUA+.
What is the minimum VCC level at which MAX706SCUA+ guarantees RESET assertion?
MAX706SCUA+ guarantees active-low RESET assertion down to VCC = 1.0V, as explicitly stated in the datasheet's "Guaranteed RESET Assertion to VCC = 1V" feature and confirmed in the Absolute Maximum Ratings and Electrical Characteristics sections. This ensures deterministic reset behavior during deep undervoltage transients, a critical requirement for data integrity in battery-backed systems using MAX706SCUA+.
MAX706SCUA+ 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:
- 2.93V
- 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
MAX706SCUA+ FAQ
1.How can I place an order for MAX706SCUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706SCUA+ 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 MAX706SCUA+ reliable?
The price and inventory of MAX706SCUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706SCUA+ is usually 5 days.
3.What payment methods are accepted for MAX706SCUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706SCUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706SCUA+?
MAX706SCUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706SCUA+ 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 MAX706SCUA+?
For technical support, including MAX706SCUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706SCUA+ requirements.
6.How does Aetrix verify that MAX706SCUA+ is sourced from the original manufacturer or authorized distributors?
All MAX706SCUA+ 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 MAX706SCUA+ meets industry standards.
7.What is the process for return or replacement of MAX706SCUA+?
All MAX706SCUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706SCUA+, 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 MAX706SCUA+ part is unused and in its original packaging.
Return procedure for MAX706SCUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX706SCUA+ Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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