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Analog Devices Inc./Maxim Integrated MAX706RCUA
- Part No.:
- MAX706RCUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706RCUA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:908
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Product details
Overview
MAX706RCUA from Maxim Integrated is an active-low reset supervisory IC for +3V microprocessor systems, providing precision 2.63V supply monitoring, 200ms reset pulse width, watchdog timeout (1.6s), and power-fail warning via 1.25V PFI comparator - used in battery-powered instruments and embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX706RCUA datasheet, MAX706RCUA pinout, MAX706RCUA application, or MAX706RCUA equivalent, this page delivers verified electrical specs, µMAX-8 package layout, functional role in power-up sequencing, and validated alternatives for industrial-grade µP supervision.
Technical Context
The MAX706RCUA implements a voltage-monitoring reset generator with internal 2.63V threshold and 20mV hysteresis, guaranteeing RESET assertion down to VCC = 1V. Its watchdog circuit resets on WDI edge transitions within 1.6s and asserts WDO low upon timeout or VCC brownout.
It integrates a 1.25V precision reference for external PFI-based power-fail or low-battery detection, with PFO output sinking current when PFI falls below threshold. MR input is TTL/CMOS-compatible, debounced by ≥200ms reset delay, and internally pulled up with 70µA current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset activation before µP operational voltage collapse in +3V systems |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization after power-up |
| Watchdog Timeout | 1.6s ±0.65s; detects µP lockup or software hang without requiring external timing components |
| Supply Current | 100µA max at +25°C; enables long battery life in portable instrumentation and handheld devices |
| PFI Threshold | 1.25V ±0.05V; supports accurate power-fail warning or secondary supply monitoring via external resistor divider |
| Operating Voltage | 1.0V to 5.5V; guarantees RESET assertion even during deep brownout (down to VCC = 1V) |
| Output Drive | RESET sinks 1.2mA at VCC < 3.6V (VOL ≤ 0.3V); compatible with standard CMOS/TTL reset inputs |
Pinout & Package
MAX706RCUA is housed in an 8-pin µMAX® package (U8-1), measuring 3mm × 3mm with 0.65mm lead pitch, optimized for space-constrained PCB layouts in portable and embedded applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internal 70µA pull-up; triggers 200ms reset pulse when pulled below 0.6V |
| 2 (VCC) | Positive supply input | Accepts 1.0V–5.5V; powers all internal circuits including reset generator, watchdog, and comparator |
| 3 (GND) | Ground reference | Common return path for all analog and digital functions; must be low-impedance for noise immunity |
| 4 (PFI) | Power-fail comparator input | Monitors external voltage divider; asserts PFO when input falls below 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 during VCC brownout (releases 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; resets internal timer on rising/falling transition; open-circuit disables watchdog only in AP/AR/AS/AT variants |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior during deep undervoltage conditions where µP may become unstable |
| Debounced MR input with 200ms minimum pulse | Eliminates need for external RC debounce circuitry; supports direct pushbutton connection |
| 1.25V precision PFI reference with 10mV hysteresis | Prevents chatter on power-fail detection near trip point; enables robust low-battery warning design |
| Watchdog disable on high-impedance WDI (AP/AR/AS/AT only) | Not applicable to MAX706RCUA - watchdog is always enabled; distinguishes R/S/T from AP/AR/AS/AT variants |
| 200ms factory-trimmed reset timeout | Provides consistent, temperature-stable reset duration without external capacitor dependency |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller-Based Controllers |
|---|---|
|
Use Scenario: Handheld multimeter powered by 3.7V Li-ion battery with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main +3.3V rail; asserts RESET if battery sags below 2.63V or AC adapter disconnects. Use Value: Prevents corrupted EEPROM writes and firmware crashes during battery switchover or low-voltage operation. |
Use Scenario: PLC I/O module operating from +24V DC converted to +3.3V via buck regulator. IC Role / Device Role / Timing Role: Monitors regulated +3.3V supply and feeds PFI from unregulated input to detect upstream power loss. Use Value: Triggers PFO→MR reset sequence 100ms before main supply collapse, enabling safe I/O state freeze. |
| Critical µP Power Monitoring in Medical Devices | Computers and Embedded Computing Platforms |
|
Use Scenario: Portable ECG monitor with real-time signal processing µP and flash memory storage. IC Role / Device Role / Timing Role: Provides fail-safe reset during battery depletion and uses WDO to detect firmware hangs in data acquisition loop. Use Value: Ensures clinical data integrity by forcing controlled reboot before memory corruption occurs. |
Use Scenario: Compact fanless industrial PC using +3.3V core logic and +5V peripherals. IC Role / Device Role / Timing Role: Generates synchronized RESET for CPU, FPGA, and PMIC; monitors both rails via PFI divider network. Use Value: Eliminates need for discrete reset ICs per rail, reducing BOM count and board area by 60%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCUA | Reset threshold = 2.93V (vs. 2.63V); otherwise identical pinout, timing, and feature set | Used where higher reset voltage is required to accommodate wider VCC tolerance or slower-rising supplies | Select MAX706SCUA when system VCC must remain above 2.93V for stable µP operation; verify compatibility with µP's minimum VDD specification. |
| TPS3808G12DBVR | Active-low reset, 1.2V threshold, 200ms delay, but no watchdog or PFI/PFO functions; SOT-23-6 package | Lacks watchdog and power-fail comparator; suited for basic reset-only applications with tighter space constraints | Choose TPS3808G12DBVR only if watchdog and PFI functionality are unused; requires PCB redesign due to different pin count and package. |
Compared with MAX706SCUA, MAX706RCUA triggers reset earlier during brownout, improving fault coverage for low-VCC µPs; versus TPS3808G12DBVR, it delivers integrated watchdog and dual-supply monitoring in the same µMAX-8 footprint, avoiding function partitioning.
Availability
MAX706RCUA is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706RCUA 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 targets cost-sensitive, space-constrained µP supervision tasks - delivering integrated reset, watchdog, and power-fail monitoring in minimal footprint for portable and embedded platforms.
FAQ
What is the reset threshold voltage of the MAX706RCUA?
The MAX706RCUA has a factory-trimmed reset threshold of 2.63V (VCC falling), with ±70mV tolerance over temperature. This value is guaranteed across the 0°C to +70°C operating range and ensures reliable reset assertion before most +3.3V µPs exit their valid operating window. The MAX706RCUA does not support adjustable thresholds - the 2.63V level is fixed and non-programmable.
Does the MAX706RCUA include a watchdog timer function?
Yes, the MAX706RCUA includes a watchdog timer with a nominal timeout period of 1.6 seconds. It monitors the WDI pin for edge transitions and asserts the WDO output low if no toggle occurs within that window. Unlike AP/AR/AS/AT variants, the watchdog in MAX706RCUA cannot be disabled - it remains active whenever VCC is within specification.
Can the MAX706RCUA monitor a secondary power supply?
Yes, the MAX706RCUA supports secondary supply monitoring via its PFI (Power-Fail Input) pin, which compares an external voltage against an internal 1.25V reference. By connecting PFI to a resistive divider from an unregulated rail (e.g., +12V or -5V), designers can generate early-warning PFO interrupts before main supply collapse - a capability confirmed in the MAX706RCUA datasheet Figure 5 and Applications Information section.
What package type is used for the MAX706RCUA?
The MAX706RCUA is supplied in an 8-pin µMAX® package (package code U8-1), measuring 3mm × 3mm with 0.65mm lead pitch. This leaded surface-mount package is RoHS-compliant, offers thermal performance comparable to SO-8, and is pin-compatible with other MAX706R/S/T variants in µMAX format - enabling drop-in replacement within the same family.
Is the MAX706RCUA suitable for operation down to 1V supply voltage?
Yes, the MAX706RCUA guarantees RESET output assertion down to VCC = 1.0V (at TA = 0°C to +70°C), as explicitly stated in the datasheet Absolute Maximum Ratings and Electrical Characteristics tables. Below 1V, RESET becomes high-impedance; for robust low-VCC operation, a pull-down resistor on the RESET line is recommended per Figure 6 in the datasheet.
MAX706RCUA 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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-µMAX
MAX706RCUA FAQ
1.How can I place an order for MAX706RCUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706RCUA 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 MAX706RCUA reliable?
The price and inventory of MAX706RCUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706RCUA is usually 5 days.
3.What payment methods are accepted for MAX706RCUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706RCUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706RCUA?
MAX706RCUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706RCUA 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 MAX706RCUA?
For technical support, including MAX706RCUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706RCUA requirements.
6.How does Aetrix verify that MAX706RCUA is sourced from the original manufacturer or authorized distributors?
All MAX706RCUA 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 MAX706RCUA meets industry standards.
7.What is the process for return or replacement of MAX706RCUA?
All MAX706RCUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX706RCUA, 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 MAX706RCUA part is unused and in its original packaging.
Return procedure for MAX706RCUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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