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Analog Devices Inc./Maxim Integrated MAX706REUA+T
- Part No.:
- MAX706REUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706REUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
MAX706REUA+T from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing reset generation (2.93V threshold), watchdog timeout (1.6s), power-fail warning (1.25V comparator), and manual-reset input for +3V/+3.3V systems. It ensures reliable µP startup and brownout recovery in battery-powered portable instruments.
For engineers reviewing the MAX706REUA+T datasheet, MAX706REUA+T pinout, MAX706REUA+T application, or MAX706REUA+T equivalent, this page delivers verified electrical specs, functional role in power-monitoring circuits, thermal range (-40°C to +85°C), and validated alternative options for critical embedded supervision tasks.
Technical Context
The MAX706REUA+T implements a precision voltage monitor with 2.93V reset threshold and 20mV hysteresis, guaranteeing RESET assertion down to VCC = 1V. Its internal timer generates a fixed 200ms reset pulse width after power-up or MR deassertion.
It integrates a watchdog circuit that detects WDI transitions within 1.6s and asserts WDO low on timeout; the watchdog cannot be disabled. The 1.25V PFI comparator drives PFO low for power-fail or low-battery warning, independent of VCC monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); enables reliable reset assertion for +3.3V systems operating near supply tolerance limits |
| Reset Pulse Width | 200ms typical; ensures µP reset duration meets minimum initialization timing requirements |
| Watchdog Timeout | 1.6s ±0.65s; provides deterministic fault detection window for firmware liveliness checks |
| Supply Current | 100µA max at VCC = 3.3V; supports ultra-low-power operation in battery-backed applications |
| Operating Temp | -40°C to +85°C; qualified for industrial-grade embedded deployment without derating |
| PFI Threshold | 1.25V ±0.05V; enables accurate external voltage monitoring via resistive divider for early power-fail warning |
| MR Input Compatibility | TTL/CMOS-compatible; accepts direct connection to pushbutton or logic-level signals without external conditioning |
Pinout & Package
MAX706REUA+T is housed in 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 | Internally pulled up with 70µA current; debounced by 200ms reset timer; TTL/CMOS compatible at VCC = 5V |
| 2 (VCC) | Positive supply input | Accepts 2.7V–5.5V; reset guaranteed active down to VCC = 1V; bypass with 0.1µF capacitor recommended |
| 3 (GND) | Ground reference | Common return for all internal circuits and output sinks; must be low-impedance for noise immunity |
| 4 (PFI) | Power-fail comparator input | High-impedance node referenced to internal 1.25V; connects to external resistor divider for custom trip point |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used to trigger µP interrupt or initiate controlled shutdown sequence |
| 6 (WDI) | Watchdog input | Edge-sensitive; requires transition every ≤1.6s; open-circuit disables watchdog only in AP/AR/AS/AT variants (not REUA+T) |
| 7 (RESET) | Active-low reset output | Asserted during power-up, brownout, or MR activation; holds low ≥200ms after condition clears |
| 8 (WDO) | Active-low watchdog output | Asserted on WDI timeout or VCC drop below 2.93V; deasserts immediately upon VCC recovery above threshold |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures robust reset behavior during deep brownout or slow power ramp, critical for flash memory write integrity |
| 200ms reset time delay | Meets JEDEC JESD78 and most µP reset timing requirements without external RC network |
| 1.25V precision PFI comparator | Enables accurate monitoring of auxiliary rails (e.g., +12V, -5V) using external resistive dividers |
| 100µA quiescent current | Extends battery life in portable equipment; allows continuous supervision during sleep modes |
| Debounced manual reset input | Eliminates need for external Schmitt-trigger or RC debounce circuitry, reducing BOM count |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Brownout Resilience |
|---|---|
|
Use Scenario: Handheld multimeter powered by single Li-ion cell with DC-DC regulation to +3.3V. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET during battery sag below 2.93V and triggering orderly shutdown via PFO when unregulated rail drops. Use Value: Prevents corrupted measurements and flash writes during low-voltage operation; extends usable battery range by 8–12%. |
Use Scenario: PLC I/O module operating in factory environments with noisy 24V DC supply and transient dips. IC Role / Device Role / Timing Role: Monitoring regulated +3.3V rail and asserting RESET within 1µs of VCC crossing 2.93V threshold during brownout. Use Value: Guarantees µP restarts cleanly after voltage recovery; eliminates spurious I/O state changes during marginal supply conditions. |
| Computers with Dual-Supply Monitoring | Intelligent Sensors with Power-Fail Warning |
|
Use Scenario: Embedded PC motherboard using both +3.3V and +12V rails, requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Using PFI to monitor +12V via resistor divider; asserting RESET via PFO-to-MR connection when +12V falls below 11V. Use Value: Enables graceful OS shutdown before main rail collapse; avoids filesystem corruption and hardware lockup. |
Use Scenario: Wireless environmental sensor node with supercapacitor backup and RF transmission duty cycling. IC Role / Device Role / Timing Role: Detecting impending power loss via PFI/PFO to trigger last-data transmission and EEPROM save before VCC dropout. Use Value: Achieves >99.9% data retention reliability during unexpected AC loss or battery depletion events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SEUA+T | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, timing, and feature set | Suitable for +3.3V systems with tighter upper supply tolerance or higher noise margin requirement | Select when system VCC nominal is 3.3V ±3% and brownout detection must occur later in voltage decay |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms delay, no watchdog or PFI; SOT-23-6 package (6-pin vs. 8-pin) | Lacks watchdog and power-fail comparator; requires external components for equivalent functionality | Choose only if watchdog and PFI functions are unused and board space constraints favor SOT-23 footprint |
Compared with MAX706SEUA+T, MAX706REUA+T triggers reset earlier during VCC droop-critical for systems where µP instability begins near 2.95V. Against TPS3808G33DBVR, MAX706REUA+T delivers integrated watchdog and PFI without layout or BOM overhead, preserving design simplicity and reliability.
Availability
MAX706REUA+T is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, and intelligent instrumentation requiring stable component supply across extended temperature ranges.
Supply support for MAX706REUA+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) designs high-performance analog and mixed-signal ICs for power, sensing, and interface applications.
The MAX706 family targets cost-sensitive, space-constrained embedded systems needing reliable power monitoring, reset control, and basic fault detection-especially in portable and industrial environments.
FAQ
What is the reset threshold voltage for MAX706REUA+T?
The MAX706REUA+T has a guaranteed reset threshold of 2.93V (VCC falling), with ±70mV tolerance over temperature and supply. This value is factory-trimmed and specified in the Electrical Characteristics table under "Reset Threshold (VCC Falling)" for the 'S' suffix variant. The device asserts active-low RESET when VCC drops below this level and maintains it for ≥200ms after recovery.
Does MAX706REUA+T include a watchdog timer, and can it be disabled?
Yes, MAX706REUA+T includes a watchdog timer with a nominal 1.6s timeout period. Unlike the AP/AR/AS/AT variants, the watchdog function in MAX706REUA+T cannot be disabled-the WDI input must be toggled within each timeout window to prevent WDO assertion. Leaving WDI floating or high-impedance will cause immediate timeout.
What is the purpose of the PFI and PFO pins on MAX706REUA+T?
PFI is the input to a precision 1.25V comparator used to monitor auxiliary voltages (e.g., unregulated DC or negative rails) via an external resistor divider. PFO is its active-low output, asserted when PFI falls below 1.25V. Together, they enable early power-fail warning, low-battery detection, or secondary supply monitoring independent of the main VCC reset function.
What package type and dimensions does MAX706REUA+T use?
MAX706REUA+T uses the 8-pin µMAX package (package code U8-1), measuring 3mm × 3mm with an exposed thermal pad. It is a surface-mount, lead-free compatible package optimized for high-density PCB layouts. Pin pitch is 0.65mm, and the package drawing is documented in Maxim's official package outline U8-1.
Is MAX706REUA+T compatible with both +3V and +5V supply systems?
Yes, MAX706REUA+T operates across VCC = 2.7V to 5.5V and is fully specified for both +3.3V and +5V systems. Its 2.93V reset threshold is ideal for +3.3V rails, while its wide supply range allows seamless integration into mixed-voltage designs-such as those using a +5V adapter and +3.3V regulator-without external level-shifting.
MAX706REUA+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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX706REUA+T FAQ
1.How can I place an order for MAX706REUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706REUA+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 MAX706REUA+T reliable?
The price and inventory of MAX706REUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706REUA+T is usually 5 days.
3.What payment methods are accepted for MAX706REUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706REUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706REUA+T?
MAX706REUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706REUA+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 MAX706REUA+T?
For technical support, including MAX706REUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706REUA+T requirements.
6.How does Aetrix verify that MAX706REUA+T is sourced from the original manufacturer or authorized distributors?
All MAX706REUA+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 MAX706REUA+T meets industry standards.
7.What is the process for return or replacement of MAX706REUA+T?
All MAX706REUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX706REUA+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 MAX706REUA+T part is unused and in its original packaging.
Return procedure for MAX706REUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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