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Analog Devices Inc./Maxim Integrated MAX706REUA+
- Part No.:
- MAX706REUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706REUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:284
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Product details
Overview
MAX706REUA+ from Maxim Integrated is an active-low microprocessor supervisory circuit in 8-pin µMAX package, providing reset generation (2.63V threshold), watchdog timer (1.6s timeout), power-fail warning (1.25V comparator), and manual-reset input for +3V/+3.3V systems. It guarantees RESET assertion down to VCC = 1V and consumes only 100µA quiescent current, enabling reliable power monitoring in battery-powered portable instruments.
For engineers reviewing the MAX706REUA+ datasheet, MAX706REUA+ pinout, MAX706REUA+ application, or MAX706REUA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts - all grounded in Maxim's official specifications for the -40°C to +85°C industrial-grade variant.
Technical Context
The MAX706REUA+ integrates a precision voltage monitor with 2.63V ±1.5% reset threshold and 20mV hysteresis, a 1.6s watchdog timer with WDI edge-triggered reset, and a dedicated 1.25V reference-based power-fail comparator (PFI/PFO). Its internal 70µA MR pull-up enables direct pushbutton interfacing without external components.
RESET output remains asserted for 200ms after VCC exceeds threshold or MR release, and the device maintains guaranteed logic-level output down to VCC = 1V. The watchdog function cannot be disabled - unlike MAX706AR/AS/AT variants - and WDO asserts immediately on VCC brownout, independent of timer state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% - precisely monitors +3V supply for brownout detection at system-critical level |
| Reset Pulse Width | 200ms minimum - ensures sufficient duration for µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±40% - provides robust software hang detection without excessive false triggers |
| Quiescent Current | 100µA max at VCC = 3.3V - enables multi-year operation in coin-cell–powered devices |
| Supply Range | 1.2V to 5.5V - supports valid reset assertion during deep brownout and compatibility with 5V legacy systems |
| PFI Threshold | 1.25V ±40mV - allows accurate power-fail or low-battery warning via external resistive divider |
| MR Input Compatibility | TTL/CMOS - accepts direct connection to µP GPIO or mechanical switch without level-shifting |
Pinout & Package
MAX706REUA+ uses an 8-pin µMAX package (U8-1), 3mm × 3mm, exposed pad, lead-free, surface-mount. Pin 1 is top-left corner marked dot; pin count increases counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Internally pulled up with 70µA; 500ns min pulse width at 3V; debounced by 200ms reset timing |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; powers all internal circuits and guarantees RESET assertion down to 1V |
| 3 (GND) | Ground reference | Return path for all analog and digital functions; must be low-impedance for comparator accuracy |
| 4 (PFI) | Power-fail comparator input | High-impedance node referenced to 1.25V; connects to 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 assert MR for cascaded reset |
| 6 (WDO) | Active-low watchdog output | Goes low if WDI not toggled within 1.6s; also asserts on VCC brownout - not reset-latched |
| 7 (RESET) | Active-low reset output | Drives µP reset pin; asserted during power-up, brownout, or MR activation; 200ms delay on release |
| 8 (WDI) | Watchdog input | Edge-sensitive; accepts 100ns pulses at 3V; no disable capability in MAX706R-series |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior during severe brownout, preventing undefined µP states |
| 200ms reset time delay | Meets µP tRST requirements across voltage and temperature; eliminates need for external RC timing |
| 1.25V precision PFI reference | Enables accurate low-battery detection or auxiliary supply monitoring with <±40mV tolerance |
| 100µA quiescent current | Extends battery life in portable equipment; supports always-on supervision without significant drain |
| Debounced MR input | Eliminates need for external RC filter or firmware debouncing; compatible with mechanical switches |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Brownout Resilience |
|---|---|
|
Use Scenario: Handheld multimeter powered by two AA cells, requiring reliable reset during battery depletion and cold-temperature operation. IC Role / Device Role / Timing Role: Supervisory IC generating active-low RESET signal and power-fail warning (PFO) to initiate graceful shutdown before data loss. Use Value: 2.63V reset threshold aligns with typical Li-ion or alkaline discharge curve; 100µA supply current extends operational life by >12 months. |
Use Scenario: PLC I/O module operating in factory environments with fluctuating 3.3V rail due to EMI and load transients. IC Role / Device Role / Timing Role: Voltage monitor asserting RESET during brownout and watchdog supervisor detecting firmware lockup in real-time control loop. Use Value: 200ms reset pulse ensures full µP recovery; 1.6s watchdog timeout balances responsiveness and noise immunity. |
| Embedded Computing in Ruggedized Devices | Medical Diagnostic Handhelds |
|
Use Scenario: Field-deployable data logger using +3.3V supply from DC-DC converter, subject to thermal cycling and vibration-induced supply dips. IC Role / Device Role / Timing Role: Dual-role supervisor: reset generator during power ramp and PFI-based early-warning detector for unregulated input collapse. Use Value: Guaranteed RESET to VCC = 1V prevents boot failure under marginal conditions; PFI comparator enables predictive power management. |
Use Scenario: Portable ultrasound probe with critical firmware integrity requirements and battery-backed SRAM retention. IC Role / Device Role / Timing Role: System health monitor asserting RESET on supply fault and triggering PFO-driven NMI to save volatile diagnostic data pre-shutdown. Use Value: Active-low RESET matches most medical µP reset inputs; 1.25V PFI reference enables precise end-of-battery detection at 2.8V system level. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SEUA+ | Higher reset threshold (2.93V); identical pinout, package, and feature set | Better suited for +3.3V systems with tighter supply tolerance; less margin for brownout detection | Select MAX706SEUA+ when main supply nominal is 3.3V ±3% and brownout detection must occur above 2.9V |
| TPS3808G125DBVR | Lower quiescent current (1.1µA); fixed 1.25V reset threshold; no PFI/PFO or watchdog | Lacks power-fail warning and watchdog - suitable only for basic reset-only applications | Choose TPS3808G125DBVR only if system requires ultra-low-power reset supervision without auxiliary monitoring features |
Compared with MAX706SEUA+, MAX706REUA+ offers earlier brownout response (2.63V vs. 2.93V), improving system uptime in marginal supply conditions; compared with TPS3808G125DBVR, it provides integrated watchdog and power-fail detection - eliminating two external components and reducing BOM count.
Availability
MAX706REUA+ 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 MAX706REUA+ 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 demanding industrial, automotive, and computing applications, with emphasis on reliability and integration.
The MAX706 family delivers cost-effective, single-chip µP supervision for +3V systems - targeting portable, battery-operated, and space-constrained embedded designs where power efficiency and supply robustness are critical.
FAQ
What is the reset threshold voltage for MAX706REUA+?
The MAX706REUA+ has a factory-trimmed reset threshold of 2.63V ±1.5%, specified over the full -40°C to +85°C temperature range. This value is guaranteed to hold across supply voltages from 1.2V to 5.5V and ensures reliable detection of brownout conditions in +3V systems. The threshold exhibits 20mV hysteresis to prevent chatter near the trip point.
Does MAX706REUA+ include a watchdog timer, and can it be disabled?
Yes, MAX706REUA+ includes a watchdog timer with a nominal 1.6s timeout period, triggered by edges on the WDI pin. Unlike the MAX706AR/AS/AT variants, the watchdog function in MAX706REUA+ cannot be disabled - it remains active whenever VCC is within specification. WDO asserts both on timeout and immediately upon VCC falling below 2.63V.
What is the purpose of the PFI and PFO pins on MAX706REUA+?
PFI is the input to a precision 1.25V comparator used for power-fail warning or low-battery detection; it accepts an external resistive divider to set custom trip points. PFO is the active-low open-drain output that asserts when PFI falls below 1.25V. Together, they enable early-warning shutdown sequencing - for example, triggering an NMI to save data before main supply collapse.
Can MAX706REUA+ operate with a supply voltage lower than 3V?
Yes, MAX706REUA+ operates from 1.2V to 5.5V and guarantees RESET assertion down to VCC = 1V - a key differentiator for brownout resilience. At 1.2V, it maintains functional reset generation and PFI/PFO comparator operation, though WDI timing specs degrade slightly. Quiescent current remains ≤100µA across the full range.
What package type and footprint does MAX706REUA+ use?
MAX706REUA+ is supplied in an 8-pin µMAX package (U8-1), measuring 3mm × 3mm with 0.65mm pitch and an exposed thermal pad. It is pin-compatible with other MAX706R/S/T variants in µMAX, SO, and PDIP packages. The µMAX footprint enables high-density PCB layouts while maintaining thermal performance comparable to SO-8.
MAX706REUA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX706REUA+ FAQ
1.How can I place an order for MAX706REUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706REUA+ 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+ reliable?
The price and inventory of MAX706REUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706REUA+ is usually 5 days.
3.What payment methods are accepted for MAX706REUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706REUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706REUA+?
MAX706REUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706REUA+ 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+?
For technical support, including MAX706REUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706REUA+ requirements.
6.How does Aetrix verify that MAX706REUA+ is sourced from the original manufacturer or authorized distributors?
All MAX706REUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX706REUA+?
All MAX706REUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706REUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX706REUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX706REUA+ Tags
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MIC826SYMT-TR
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