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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 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:576
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Product details
Overview
MAX706RCUA+ from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing precision +3V supply monitoring (2.63V reset threshold), 200ms reset pulse width, watchdog timer (1.6s timeout), and power-fail warning via 1.25V comparator - used in battery-powered instruments and embedded controllers to ensure reliable power-up/power-down sequencing.
For engineers reviewing the MAX706RCUA+ datasheet, MAX706RCUA+ pinout, MAX706RCUA+ application, or MAX706RCUA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed operating parameters across temperature, real-world use context for portable +3V systems, and validated alternative options with documented differences.
Technical Context
The MAX706RCUA+ integrates a precision voltage monitor with 20mV hysteresis, a 1.6s watchdog timer that resets on WDI transition and disables only in AP/AR/AS/AT variants (not applicable here), and a separate 1.25V reference comparator for PFI/PFO power-fail detection. Its RESET output asserts low when VCC falls below 2.63V or MR is pulled low, holding for ≥200ms after recovery.
It operates from 1.0V to 5.5V supply, guarantees RESET assertion down to VCC = 1V, draws only 100µA quiescent current, and features TTL/CMOS-compatible manual reset input with 500ns minimum pulse width at 3V. The µMAX package enables compact placement in space-constrained portable designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset assertion before brownout affects +3V µP operation |
| Reset Pulse Width | 200ms minimum; provides sufficient time for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±0.65s; detects µP lockup in embedded control loops without requiring external timing components |
| Quiescent Current | 100µA max at +25°C; enables multi-year battery life in always-on portable instrumentation |
| Supply Voltage Range | 1.0V to 5.5V; supports valid RESET assertion during deep brownout and compatibility with both +3V and +5V systems |
| Power-Fail Threshold | 1.25V internal reference; allows configurable early-warning detection of unregulated supply collapse via external resistor divider |
| Operating Temp | 0°C to +70°C; qualified for commercial-grade industrial and consumer equipment environments |
Pinout & Package
MAX706RCUA+ uses an 8-pin µMAX package (U8-1), 3mm × 3mm, exposed pad, surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; pull below 0.6V to trigger 200ms reset pulse; internally sourced by 70µA current |
| 2 (VCC) | Positive supply input | Accepts 1.0V–5.5V; powers all internal circuits including reset generator and watchdog timer |
| 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 | Connects to resistive divider; asserts PFO when voltage falls below 1.25V internal reference |
| 5 (PFO) | Active-low power-fail output | Open-drain output sinks current when PFI < 1.25V; used for µP interrupt or cascaded reset initiation |
| 6 (WDO) | Active-low watchdog output | Asserts low if WDI not toggled within 1.6s; also asserts during VCC brownout; requires external pull-up |
| 7 (RESET) | Active-low reset output | Guaranteed low when VCC < 2.63V or MR low; remains low ≥200ms after recovery; drives µP reset pin directly |
| 8 (WDI) | Watchdog input | Rising/falling edge resets 1.6s timer; no disable capability in R/S/T variants; min. pulse width 100ns at 2.7V |
Key Features
| Feature | Design Value |
|---|---|
| Precision 2.63V reset threshold | Matches standard +3V system brownout margin; ±1.5% tolerance ensures consistent behavior across production lots |
| Guaranteed RESET assertion to VCC = 1V | Enables fail-safe reset hold during severe undervoltage events where other supervisors lose functionality |
| Debounced manual reset input | 140ms minimum internal debounce eliminates need for external RC filtering on pushbutton switch interfaces |
| 1.25V precision power-fail reference | Allows accurate early-warning detection of unregulated supply collapse using two external resistors |
| Low 100µA quiescent current | Minimizes standby power draw in battery-backed applications such as handheld test equipment |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Brownout Resilience |
|---|---|
Use Scenario: Handheld multimeter powered by single 3.7V Li-ion cell, operating across 4.2V (fully charged) to 3.0V (low-battery cutoff). IC Role / Device Role / Timing Role: Supervisory IC monitors main supply, triggers reset if voltage drops below 2.63V, and signals low-battery condition via PFO when cell voltage nears 3.2V. Use Value: Prevents corrupted measurements or firmware crashes during battery sag; extends usable runtime by enabling graceful shutdown before critical undervoltage. |
Use Scenario: PLC I/O module powered from +3.3V rail derived from noisy industrial DC bus subject to transient dips. IC Role / Device Role / Timing Role: Provides 200ms reset hold time and 1.6s watchdog supervision to recover from µP lockups caused by EMI-induced instruction corruption. Use Value: Eliminates need for external RC reset networks and discrete watchdog timers; reduces BOM count while improving MTBF in harsh environments. |
| Computers with Dual-Supply Monitoring | Intelligent Sensors with Power-Fail Logging |
Use Scenario: Embedded computer board using both +3.3V core and +12V auxiliary rails, requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Monitors +3.3V via VCC pin and +12V via PFI divider; asserts RESET on either fault and uses PFO to trigger backup SRAM write before power loss. Use Value: Enables deterministic power-loss response without FPGA or µP intervention; supports data integrity in mission-critical logging. |
Use Scenario: Smart environmental sensor node with EEPROM-based event log, deployed in remote locations with intermittent solar charging. IC Role / Device Role / Timing Role: Detects impending power failure via PFI, asserts PFO to interrupt µP, initiating immediate EEPROM save of last sensor reading before shutdown. Use Value: Preserves critical field data during unexpected power interruption; avoids log corruption or loss due to incomplete writes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCUA+ | Higher reset threshold (2.93V); identical pinout, package, and feature set | Suitable for +3.3V systems where tighter brownout margin is required; less tolerant of supply ripple | Select when system VCC nominal is 3.3V and brownout must occur closer to nominal voltage |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor); 3.6V min VCC; no integrated watchdog timer | Lacks WDI/WDO functionality; requires external timing components for watchdog emulation | Choose when precise threshold tuning is needed and watchdog is implemented separately in firmware or logic |
Compared with MAX706SCUA+, MAX706RCUA+ triggers reset earlier during supply droop, improving robustness in marginal +3V battery operation; compared with TPS3808G12DBVR, it integrates watchdog functionality without external components but fixes threshold at 2.63V.
Availability
MAX706RCUA+ is available at Aetrix Electronics and suitable for battery-powered instruments, industrial controllers, embedded computers, and intelligent sensors requiring stable component supply across commercial temperature range and long-term design-in support.
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, computing, and portable markets.
The MAX706 family targets cost-sensitive +3V microprocessor supervision, delivering integrated reset, watchdog, and power-fail detection in minimal footprint for space-constrained embedded systems.
FAQ
What is the reset threshold voltage for MAX706RCUA+?
The MAX706RCUA+ has a fixed reset threshold of 2.63V (VCC falling), with ±1.5% tolerance over temperature. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The threshold applies specifically to the R-suffix variant and is distinct from S (2.93V) and T (3.08V) versions. MAX706RCUA+ asserts its active-low RESET output whenever VCC drops below this level.
Does MAX706RCUA+ include a watchdog timer function?
Yes, MAX706RCUA+ includes a built-in watchdog timer with a nominal timeout period of 1.6 seconds. A rising or falling edge on the WDI pin resets the timer; failure to toggle WDI within 1.6s causes the WDO pin to go low. Unlike AP/AR/AS/AT variants, the watchdog in MAX706RCUA+ cannot be disabled - it remains active whenever VCC is above the reset threshold.
Can MAX706RCUA+ monitor a secondary power supply like +12V?
Yes, MAX706RCUA+ can monitor a secondary supply such as +12V using its PFI (power-fail input) pin. By connecting PFI to a resistive divider from the +12V rail, the internal 1.25V comparator triggers PFO when the divided voltage falls below 1.25V - corresponding to a user-defined trip point (e.g., 11V). This enables early-warning detection independent of the main VCC supply.
What is the minimum VCC voltage at which MAX706RCUA+ guarantees RESET assertion?
MAX706RCUA+ guarantees active-low RESET assertion down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the RESET output becomes high-impedance. This capability ensures fail-safe reset hold during deep brownout conditions where many competing supervisors cease functioning.
Is MAX706RCUA+ pin-compatible with other MAX706 variants in the same package?
Yes, MAX706RCUA+ is pin-compatible with all other MAX706P/R/S/T and MAX706AP/AR/AS/AT variants in the 8-pin µMAX package (U8-1), including identical pin numbering and function mapping. Differences are limited to reset threshold voltage, RESET polarity (active-low for R/S/T), and watchdog disable capability (absent in R/S/T), not pinout or package dimensions.
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:
- Tube
- 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+ 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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