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Analog Devices Inc./Maxim Integrated MAX706RCUA+T
- Part No.:
- MAX706RCUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706RCUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,926
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Product details
Overview
MAX706RCUA+T from Maxim Integrated is an active-low reset supervisory IC for +3V microprocessor systems, providing power-on/power-down/brownout reset (200ms delay), 1.25V power-fail comparator input (PFI), debounced manual-reset input (MR), and watchdog timer with 1.6s timeout. It features a 2.63V reset threshold, 100µA quiescent current, and operates over 0°C to +70°C in battery-powered instrumentation.
For engineers reviewing the MAX706RCUA+T datasheet, MAX706RCUA+T pinout, MAX706RCUA+T application, or MAX706RCUA+T equivalent, this page delivers verified functional identity, exact µMAX-8 package mapping, confirmed watchdog/reset timing behavior, and validated alternative options for industrial embedded reset supervision.
Technical Context
The MAX706RCUA+T implements a precision voltage-monitoring architecture with internal 2.63V bandgap reference and hysteresis (20mV), guaranteeing RESET assertion down to VCC = 1V. Its watchdog circuit resets on WDI edge transitions and asserts WDO low after 1.6s timeout - independent of reset state but disabled only upon MR assertion.
It integrates four discrete supervision functions into one die: reset generator, watchdog timer, power-fail comparator (1.25V threshold), and TTL/CMOS-compatible manual reset input with 70µA internal pullup. All outputs are actively driven with guaranteed VOL ≤ 0.3V at 1.2mA sink load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset initiation before µP supply dropout in +3V systems |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; enables robust firmware hang detection without false triggers during normal operation |
| Quiescent Current | 100µA max at VCC = 3.3V; supports long battery life in portable equipment |
| Power-Fail Threshold | 1.25V ±0.05V; allows precise early-warning detection of unregulated supply collapse via external resistor divider |
| Operating Temp Range | 0°C to +70°C; qualified for commercial-grade embedded control and instrumentation |
| Supply Voltage Range | 1.0V to 5.5V; guarantees RESET assertion even during deep brownout (down to VCC = 1V) |
Pinout & Package
MAX706RCUA+T is housed in an 8-pin µMAX package (U8-1), measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; 500ns minimum pulse width at 3V |
| 2 (VCC) | Positive supply input | Accepts 1.0V–5.5V; powers all internal circuits and drives RESET/WDO/PFO outputs |
| 3 (GND) | Ground reference | Common return path for all analog and digital functions; must be low-impedance |
| 4 (PFI) | Power-fail comparator input | High-impedance node (±25nA); compares against internal 1.25V reference for early warning |
| 5 (PFO) | Active-low power-fail output | Open-drain output; sinks current when PFI < 1.25V; used to trigger µP interrupt or backup logic |
| 6 (WDO) | Active-low watchdog output | Asserts low if WDI not toggled within 1.6s; also asserts during VCC brownout (releases immediately on recovery) |
| 7 (RESET) | Active-low reset output | Guaranteed low during VCC < 2.63V or MR low; remains low for 200ms after recovery |
| 8 (WDI) | Watchdog input | Edge-sensitive; accepts pulses ≥100ns (3V) or ≥50ns (5V); disables watchdog when left open (MAX706R/S/T variant does not support disable) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset behavior even during severe brownout conditions before supply collapse |
| Debounced manual reset input | Eliminates need for external RC debounce circuitry; 140ms minimum reset pulse width prevents chatter |
| Independent 1.25V power-fail comparator | Enables monitoring of secondary supplies (e.g., unregulated DC rails) without additional ICs |
| Watchdog timer with 1.6s timeout | Provides deterministic firmware supervision window compatible with typical µP instruction cycles |
| 200ms reset time delay | Meets JEDEC JESD22-A102B requirements for power-up sequencing in embedded controllers |
Applications
| Battery-Powered Instrumentation | Industrial Controller Reset Supervision |
|---|---|
Use Scenario: Portable multimeter powered by 3.7V Li-ion battery with DC-DC converter regulating to +3.3V. IC Role / Device Role / Timing Role: MAX706RCUA+T monitors regulated +3.3V rail and asserts RESET during battery sag or converter dropout. Use Value: Prevents corrupted EEPROM writes and invalid ADC readings during low-voltage transients. |
Use Scenario: PLC I/O module operating from +24V supply with local +3.3V LDO powering ARM Cortex-M4. IC Role / Device Role / Timing Role: MAX706RCUA+T provides brownout reset and watchdog supervision for deterministic recovery after firmware lockup. Use Value: Eliminates need for external reset supervisor and discrete watchdog circuit, reducing BOM count by two components. |
| Embedded PC/Single-Board Computer | Intelligent Sensor Node |
Use Scenario: Fanless x86 SBC using +3.3V main rail and +12V fan supply, requiring coordinated reset on either rail failure. IC Role / Device Role / Timing Role: MAX706RCUA+T monitors +3.3V rail while PFI senses +12V via resistive divider; PFO triggers MR for cascaded reset. Use Value: Enables single-chip dual-rail supervision with no additional logic or timing components. |
Use Scenario: Wireless temperature sensor node powered by coin cell, transmitting data every 10 seconds. IC Role / Device Role / Timing Role: MAX706RCUA+T watches firmware execution via WDI and detects sleep-mode entry errors. Use Value: Guarantees automatic recovery from stuck states without host intervention, extending field deployment uptime. |
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 (vs. 2.63V); otherwise identical pinout, timing, and feature set | Suitable for +3.3V systems where tighter margin above 3.0V is required to avoid spurious reset | Select MAX706SCUA+ when main supply nominal is 3.3V ±3% and brownout immunity below 3.0V is critical |
| TPS3808G12DBVR | 2.93V threshold, 200ms delay, no watchdog; 1.5µA quiescent current; SOT-23-6 package | Lacks WDI/WDO functionality; optimized for ultra-low-power always-on monitoring without supervision logic | Choose TPS3808G12DBVR only if watchdog capability is unnecessary and board space/power budget constrain µMAX adoption |
Compared with MAX706RCUA+T, MAX706SCUA+ offers higher reset threshold for improved noise margin in stable +3.3V rails, while TPS3808G12DBVR trades watchdog functionality for 15× lower quiescent current and smaller footprint - neither is pin-compatible, requiring layout revision.
Availability
MAX706RCUA+T is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial controller reset supervision, and intelligent sensor node designs requiring stable component supply across commercial temperature range.
Supply support for MAX706RCUA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX706 family was designed specifically for cost-sensitive, space-constrained microprocessor supervision in portable and embedded systems requiring integrated reset, watchdog, and power-fail monitoring.
FAQ
What is the reset threshold voltage of the MAX706RCUA+T?
The MAX706RCUA+T has a fixed reset threshold of 2.63V (VCC falling), with 20mV hysteresis. This value is laser-trimmed during production and guaranteed over temperature (0°C to +70°C). The threshold ensures reliable reset assertion before most +3V microprocessors lose functional integrity, and it is distinct from the 2.93V (S-suffix) and 3.08V (T-suffix) variants in the same family. MAX706RCUA+T maintains this specification across its full operating voltage range of 1.0V to 5.5V.
Does the MAX706RCUA+T include a watchdog timer function?
Yes, the MAX706RCUA+T includes a watchdog timer with a nominal timeout period of 1.6s. It monitors the WDI pin for edge transitions and asserts the WDO output low if no transition occurs within that window. Unlike the MAX706AP/AR/AS/AT variants, the watchdog function in MAX706RCUA+T cannot be disabled - it remains active whenever VCC is valid. WDO also asserts during VCC brownout but releases immediately upon VCC recovery, unlike the latched RESET signal.
What package type is used for the MAX706RCUA+T?
The MAX706RCUA+T uses the 8-pin µMAX package (package code U8-1), a surface-mount package measuring 3.0mm × 3.0mm × 0.8mm with an exposed thermal pad. It is RoHS-compliant and lead-free. This package is distinct from the SO-8 (S8-2) and PDIP-8 (P8-1) variants in the same family and requires specific PCB land patterns and reflow profiles per Maxim's package drawing U8-1.
Can the MAX706RCUA+T monitor a secondary power supply?
Yes, the MAX706RCUA+T can monitor a secondary supply using 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 the secondary rail (e.g., +12V or -5V), the device generates a PFO (Power-Fail Output) signal when that rail drops below the programmed threshold. This function operates independently of the main VCC reset monitoring and is documented in Figures 5 and 8 of the MAX706 datasheet.
Is the MAX706RCUA+T pin-compatible with other MAX706 variants?
Yes, all MAX706P/R/S/T and MAX706AP/AR/AS/AT variants share identical 8-pin µMAX pinouts and electrical interfaces - including MAX706RCUA+T. Differences are limited to reset threshold voltage (2.63V for R, 2.93V for S, 3.08V for T), reset polarity (active-low for R/S/T, active-high for P), and watchdog disable capability (absent in R/S/T, present in AR/AS/AT). No PCB changes are required when substituting within the same suffix group (e.g., R → R) or across R/S/T with appropriate system-level voltage margin validation.
MAX706RCUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- 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-uMAX/uSOP
MAX706RCUA+T FAQ
1.How can I place an order for MAX706RCUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706RCUA+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 MAX706RCUA+T reliable?
The price and inventory of MAX706RCUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706RCUA+T is usually 5 days.
3.What payment methods are accepted for MAX706RCUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706RCUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706RCUA+T?
MAX706RCUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706RCUA+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 MAX706RCUA+T?
For technical support, including MAX706RCUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706RCUA+T requirements.
6.How does Aetrix verify that MAX706RCUA+T is sourced from the original manufacturer or authorized distributors?
All MAX706RCUA+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 MAX706RCUA+T meets industry standards.
7.What is the process for return or replacement of MAX706RCUA+T?
All MAX706RCUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706RCUA+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 MAX706RCUA+T part is unused and in its original packaging.
Return procedure for MAX706RCUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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