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Analog Devices Inc./Maxim Integrated MAX706EUA+
- Part No.:
- MAX706EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX706EUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
MAX706EUA+ from Maxim Integrated is a precision microprocessor supervisory circuit in an 8-pin µMAX package, providing active-low reset output, 1.6s watchdog timeout, 4.40V supply-voltage monitoring threshold, 1.25V power-fail comparator input, and debounced manual-reset input - used for reliable power-up/down/brownout reset assertion in embedded controllers and industrial instrumentation.
For engineers reviewing the MAX706EUA+ datasheet, MAX706EUA+ pinout, MAX706EUA+ application, or MAX706EUA+ equivalent, this page delivers verified functional identity, validated pin roles, confirmed operating parameters across -40°C to +85°C, and real-world design implications for reset timing, watchdog interaction, and power-fail warning integration.
Technical Context
The MAX706EUA+ integrates four core supervisory functions: a voltage-monitoring reset generator with 4.40V threshold and 40mV hysteresis, a 1.6s watchdog timer with edge-sensitive WDI input (50ns pulse detection), a 1.25V reference-based power-fail comparator driving open-drain PFO, and a TTL/CMOS-compatible manual-reset input with internal 250µA pull-up and 150ns minimum pulse width requirement.
Its reset output remains valid down to VCC = 1V (guaranteed 0.3V low at 100µA sink), features 200ms minimum pulse width after VCC rise or MR release, and asserts immediately on brownout - with no delay between VCC crossing threshold and RESET transition, unlike WDO which rises instantly post-threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±0.15V - triggers reset during brownout when +5V rail drops below this level; enables stable operation in noisy 5V systems. |
| Watchdog Timeout | 1.60s ±0.65s - ensures system recovery if firmware fails to toggle WDI; supports fail-safe restart without external timing components. |
| Power-Fail Input Threshold | 1.25V ±0.05V - allows precise early-warning detection of supply degradation via external resistor divider on PFI. |
| Reset Pulse Width | 200ms typical - guarantees sufficient duration to fully initialize microprocessors like 80C51 or ARM Cortex-M series. |
| Supply Current | 150–500µA - ultra-low quiescent draw enables long-term battery-backed operation in backup mode. |
| Operating Temperature | -40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor instrumentation environments. |
| VCC Valid Range | 1.0V to 5.5V - permits reset assertion even during deep brownout, supporting graceful shutdown before full power loss. |
Pinout & Package
MAX706EUA+ is housed in an 8-pin µMAX package (3mm × 3mm, 0.5mm pitch), RoHS-compliant with lead-free termination (+ suffix). The package supports surface-mount assembly and thermal dissipation up to 330mW at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internal 250µA pull-up ensures defined state when unconnected; debounces pushbutton switches via 140ms minimum reset hold time. |
| 2 (VCC) | +5V Supply Input | Primary power rail connection; operates from 1.0V to 5.5V; powers all internal comparators, timers, and outputs. |
| 3 (GND) | Ground Reference | Common return path for all analog and digital functions; must be low-impedance to ensure accurate threshold detection. |
| 4 (PFI) | Power-Fail Input | Non-inverting input of comparator referenced to 1.25V; accepts divided-down voltages for monitoring secondary rails (e.g., +12V, -5V) or battery levels. |
| 5 (PFO) | Power-Fail Output | Open-drain output asserting low when PFI < 1.25V; drives NMI interrupt or external logic; requires external pull-up for active-high signaling. |
| 6 (WDI) | Watchdog Input | Edge-sensitive input; toggling within 1.6s prevents timeout; floating or high-Z disables watchdog; rising/falling edges clear internal timer. |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserting low during power-up, brownout, or MR activation; guaranteed valid down to VCC = 1V; sinks 3.2mA min. |
| 8 (WDO) | Watchdog Output | Open-drain output pulling low on timeout or VCC brownout; rises immediately when VCC exceeds threshold - no minimum pulse width. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables deterministic reset assertion during deep undervoltage conditions, critical for nonvolatile memory write protection and safe shutdown sequencing. |
| 200ms reset pulse width | Meets or exceeds minimum reset duration requirements of most 8-bit and 32-bit microcontrollers, eliminating need for external RC timing networks. |
| Debounced manual-reset input | Internal 250µA pull-up and 150ns MR pulse rejection eliminate mechanical switch bounce, reducing PCB component count and layout complexity. |
| 1.25V precision power-fail comparator | Allows accurate early-warning detection of supply collapse using simple resistor dividers - supports dual-rail monitoring (e.g., +5V and +12V) without extra ICs. |
| 1.6s watchdog timeout with edge-triggered WDI | Supports robust firmware health checking with minimal GPIO overhead; tolerates short noise spikes (<50ns) while responding reliably to missed toggles. |
Applications
| Industrial PLC Control | Medical Diagnostic Instrumentation |
|---|---|
Use Scenario: Programmable logic controller executing cyclic scan routines in factory automation cabinets with fluctuating 24VDC supplies. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET during 24V-to-5V regulator brownout and triggering watchdog timeout if scan loop hangs. Use Value: Prevents spurious I/O actuation or corrupted data logging by enforcing clean restart before firmware resumes execution. |
Use Scenario: Portable ultrasound device powered by Li-ion battery, requiring orderly shutdown when battery voltage falls below safe operating level. IC Role / Device Role / Timing Role: Monitoring battery voltage via PFI divider and asserting RESET via PFO→MR feedback to halt imaging processing before memory corruption occurs. Use Value: Guarantees NAND flash write completion and preserves calibration data integrity during battery depletion events. |
| Automotive Body Control Module | Smart Energy Metering Gateway |
Use Scenario: CAN-connected BCM managing door locks, lighting, and HVAC in vehicles exposed to cold-cranking voltage dips (down to 6V). IC Role / Device Role / Timing Role: Detecting 5V rail collapse during cranking and holding microcontroller in reset until stable supply returns, while enabling watchdog supervision of CAN stack. Use Value: Eliminates bus arbitration errors and prevents erroneous actuator commands caused by partial firmware execution during transient undervoltage. |
Use Scenario: DIN-rail mounted gateway aggregating smart meter data over RS-485 and transmitting via LTE; powered from auxiliary 5V supply derived from mains. IC Role / Device Role / Timing Role: Monitoring both 5V auxiliary rail and isolated 3.3V logic rail via PFI divider, generating PFO interrupt to initiate secure data flush before AC loss. Use Value: Ensures last-read kWh values and communication session state are preserved in FRAM before power interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706CSA | Same functionality and pinout, but rated for 0°C to +70°C commercial temperature range instead of -40°C to +85°C. | Suitable for indoor consumer electronics or lab equipment where ambient temperature stays within 0–70°C. | Select MAX706CSA only if industrial temperature grade is unnecessary; MAX706EUA+ provides broader environmental margin without layout change. |
| MAX706CUA | Identical electrical specs and µMAX package, but specified for 0°C to +70°C operation and lacks extended temperature qualification. | Applicable in cost-sensitive industrial designs where full -40°C startup is not required, e.g., HVAC control panels inside conditioned spaces. | MAX706CUA offers identical footprint and function at lower cost, but MAX706EUA+ ensures reliability across full industrial thermal envelope. |
Compared with MAX706CSA and MAX706CUA, the MAX706EUA+ delivers guaranteed operation down to -40°C - essential for outdoor, automotive, or unheated facility deployments - while maintaining identical pinout, timing behavior, and interface compatibility.
Availability
MAX706EUA+ is available at Aetrix Electronics and suitable for industrial PLC control, medical diagnostic instrumentation, automotive body control modules, and smart energy metering gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX706EUA+ 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 MAX705–MAX708 family was designed specifically for cost-sensitive, space-constrained microprocessor systems needing integrated reset, watchdog, and power-fail monitoring - targeting embedded controllers, instrumentation, and industrial automation.
FAQ
What is the reset threshold voltage of the MAX706EUA+?
The MAX706EUA+ has a nominal reset threshold of 4.40V with a tolerance of ±0.15V. This means RESET asserts when VCC drops below approximately 4.25V and releases when VCC rises above ~4.50V, providing hysteresis to prevent chatter near the trip point. This threshold is fixed and factory-trimmed - no external adjustment is possible. The MAX706EUA+ uses this value exclusively, distinguishing it from the 4.65V variant (e.g., MAX705EUA+).
Does the MAX706EUA+ include a watchdog timer?
Yes, the MAX706EUA+ includes a watchdog timer with a nominal timeout period of 1.6 seconds. It monitors the WDI pin for edges; if no rising or falling edge occurs within that window, WDO goes low. The timer clears automatically on RESET assertion, WDI three-state, or any WDI edge. This function is fully integrated and requires no external components - a key differentiator from the MAX707/MAX708 variants, which replace the watchdog with dual reset outputs.
Can the MAX706EUA+ monitor voltages other than +5V?
Yes, the MAX706EUA+ can monitor any DC voltage using its PFI input and internal 1.25V reference. By connecting a resistor divider from the target voltage to PFI, users scale the monitored signal to fall below 1.25V before critical failure - for example, detecting +12V dropout at ~11V or negative rail degradation. The MAX706EUA+ datasheet provides design equations and noise-reduction techniques (e.g., PFI–PFO hysteresis resistor, GND capacitor) for robust implementation.
What is the minimum VCC required for valid RESET output from the MAX706EUA+?
The MAX706EUA+ guarantees valid RESET output down to VCC = 1.0V. At this level, RESET remains a logic-low output (≤0.3V at 100µA sink), ensuring microcontroller reset assertion even during severe brownout. This capability is explicitly tested and specified - unlike many supervisory ICs that cease functioning below 2.5V - making the MAX706EUA+ especially valuable in battery-backed or wide-input-range power systems.
Is the MAX706EUA+ pin-compatible with other devices in the MAX705–MAX708 family?
Yes, the MAX706EUA+ shares identical 8-pin µMAX pinout with MAX705EUA+, MAX707EUA+, and MAX708EUA+. All variants use the same MR/VCC/GND/PFI/PFO/WDI/RESET/WDO assignment. However, functional differences exist: MAX706EUA+ and MAX705EUA+ include watchdog and active-low RESET; MAX707EUA+/MAX708EUA+ substitute active-high RESET and omit watchdog. So while PCB layout is interchangeable, firmware and external connections (e.g., WDI routing) must match the selected variant's feature set.
MAX706EUA+ 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:
- 4.4V
- 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
MAX706EUA+ FAQ
1.How can I place an order for MAX706EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX706EUA+ 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 MAX706EUA+ reliable?
The price and inventory of MAX706EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX706EUA+ is usually 5 days.
3.What payment methods are accepted for MAX706EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX706EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX706EUA+?
MAX706EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX706EUA+ 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 MAX706EUA+?
For technical support, including MAX706EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX706EUA+ requirements.
6.How does Aetrix verify that MAX706EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX706EUA+ 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 MAX706EUA+ meets industry standards.
7.What is the process for return or replacement of MAX706EUA+?
All MAX706EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX706EUA+, 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 MAX706EUA+ part is unused and in its original packaging.
Return procedure for MAX706EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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