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Analog Devices Inc./Maxim Integrated MAX707EUA+
- Part No.:
- MAX707EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX707EUA+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:3,262
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Product details
Overview
MAX707EUA+ from Maxim Integrated is a precision microprocessor supervisory circuit with active-high RESET output, 4.65V supply-voltage monitor threshold, 200ms reset pulse width, and -40°C to +85°C industrial temperature range in 8-pin µMAX package. It monitors +5V power rails in embedded controllers and ensures reliable μP startup and brownout recovery.
For engineers reviewing the MAX707EUA+ datasheet, MAX707EUA+ pinout, MAX707EUA+ application, or MAX707EUA+ equivalent, key selection criteria include guaranteed RESET validity down to VCC = 1.2V, manual-reset debouncing capability, power-fail warning via PFI/PFO, and compatibility with Intel 80C51-style active-high reset inputs.
Technical Context
The MAX707EUA+ integrates four core supervisory functions: power-on/brownout reset generation with 4.65V threshold and 200ms pulse width; active-high RESET output valid down to VCC = 1.2V; 1.25V precision power-fail comparator (PFI/PFO); and debounced TTL/CMOS-compatible manual-reset input (MR) with 250μA internal pull-up.
Unlike the MAX705/MAX706 series, the MAX707EUA+ substitutes active-high RESET for watchdog timer functionality-eliminating WDI/WDO pins and adding RESET (active-high) and N.C. terminals. Its reset assertion timing is synchronized to VCC crossing the 4.65V threshold with 40mV hysteresis, and MR-to-RESET delay is 250ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±15mV - triggers reset when +5V rail drops below nominal operating level, ensuring μP remains held until stable supply is restored. |
| Reset Pulse Width | 200ms typical - provides sufficient time for μP initialization and peripheral stabilization after power-up or brownout recovery. |
| Supply Voltage Range | 1.2V to 5.5V - enables valid RESET assertion during low-VCC brownout conditions and supports wide-margin system design. |
| Power-Fail Threshold | 1.25V ±5mV at PFI - allows accurate early-warning detection of failing +5V or other regulated supplies using external voltage dividers. |
| Manual-Reset Input Current | 250μA internal pull-up - eliminates need for external pull-up resistor and ensures robust switch debouncing with ≥140ms minimum pulse width. |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments including factory automation, motor control, and remote instrumentation. |
| Package | 8-pin µMAX (U8+1, 3mm × 3mm) - surface-mount footprint with thermal pad, RoHS-compliant, lead-free, suitable for high-density PCB layouts. |
Pinout & Package
The MAX707EUA+ is housed in an 8-pin µMAX package (outline 21-0036), featuring exposed thermal pad, RoHS-compliant lead-free terminations, and 0.65mm pitch. Pin 1 is marked by dot; pin numbering follows standard counter-clockwise orientation from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger; internally pulled up at 250μA; debounces pushbutton switches without external RC network. |
| 2 (VCC) | +5V Supply Input | Primary power rail connection; RESET remains valid down to VCC = 1.2V, enabling operation during deep brownout. |
| 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 1.25V comparator; accepts voltage-divided monitoring signals for early warning of supply degradation. |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output; sinks current when PFI < 1.25V; used to interrupt μP or trigger backup power switchover. |
| 6 (N.C.) | No Connect | Unbonded die pad; must remain floating-no external connection permitted to avoid functional interference or ESD risk. |
| 7 (RESET) | Active-High Reset Output | CMOS-compatible output asserted high during reset; complements RESET (pin 8); required for μPs like 80C51 with active-high reset inputs. |
| 8 (RESET) | Active-Low Reset Output | Complementary to pin 7; asserted low during reset; both outputs are simultaneously valid and synchronized to same internal timing generator. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET Validity at Low VCC | RESET output remains functional down to VCC = 1.2V, enabling deterministic reset behavior during severe brownout events before full supply collapse. |
| Dual Active Reset Outputs | Simultaneous active-high (RESET) and active-low (RESET) outputs eliminate need for external inverters and support mixed μP interface requirements. |
| Integrated Power-Fail Comparator | 1.25V precision reference with <±5mV tolerance enables accurate early-warning detection of supply droop using simple resistor dividers on any rail. |
| Debounced Manual-Reset Input | 250μA internal pull-up and 140ms minimum pulse width provide hardware-level switch debouncing-no firmware or external logic required. |
| Industrial Temperature Range | -40°C to +85°C qualification ensures stable reset timing and threshold accuracy across extended environmental conditions in real-world deployments. |
Applications
| Industrial Motor Control | Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitoring +5V logic supply in servo drive firmware during rapid load transients and line sags. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET to hold μP in known state until supply recovers above 4.65V with 200ms stabilization window. Use Value: Prevents spurious motion commands or corrupted register writes during undervoltage events, improving system safety and repeatability. |
Use Scenario: Detecting imminent AC/DC converter failure in modular I/O backplanes using PFI voltage divider from +24V field supply. IC Role / Device Role / Timing Role: Power-fail comparator triggering PFO interrupt to initiate controlled shutdown sequence before loss of communication or I/O control. Use Value: Enables graceful deactivation of solenoids, relays, and analog outputs-reducing mechanical wear and avoiding process faults. |
| Medical Diagnostic Instrument | Smart Energy Meter |
Use Scenario: Ensuring deterministic boot sequence for ARM Cortex-M4-based imaging subsystem after cold start or battery swap. IC Role / Device Role / Timing Role: Generating 200ms active-high RESET pulse synchronized to +5V rail crossing 4.65V threshold, compatible with processor's reset specification. Use Value: Guarantees consistent firmware initialization and ADC calibration timing across varying ambient temperatures and battery charge states. |
Use Scenario: Monitoring backup supercapacitor voltage during main AC outage to maintain real-time clock and secure memory integrity. IC Role / Device Role / Timing Role: Using PFI to sense capacitor discharge curve and assert PFO to signal μP for nonvolatile data save before VCC falls below 1.2V. Use Value: Preserves billing data, tamper logs, and meter configuration without requiring external supervisor IC or complex firmware polling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CUA | Same functionality and pinout, but rated for 0°C to +70°C only; lower temperature grade reduces cost for commercial-grade systems. | Limited to indoor, climate-controlled environments; unsuitable for outdoor enclosures or unheated industrial cabinets. | Select MAX707CUA if operating ambient stays within 0–70°C and BOM cost optimization is prioritized over thermal margin. |
| MAX813LEUA | Identical 4.65V reset threshold and µMAX package, but includes watchdog timer (WDI/WDO) instead of dual RESET outputs. | Supports software-driven timeout recovery in addition to power supervision; requires WDI routing and firmware integration. | Choose MAX813LEUA when system-level fault recovery mandates watchdog supervision alongside power monitoring. |
Compared with MAX707EUA+, MAX707CUA offers identical performance at lower temperature grade for cost-sensitive commercial designs, while MAX813LEUA trades dual reset outputs for integrated watchdog capability-requiring additional firmware coordination but enabling autonomous error recovery.
Availability
MAX707EUA+ is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controllers, medical diagnostic instruments, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX707EUA+ 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, automotive, and communications markets.
The MAX705–MAX708 family was designed specifically for cost-sensitive, space-constrained μP systems requiring reliable power-on reset, brownout protection, and power-fail warning without external components.
FAQ
What is the reset threshold voltage of the MAX707EUA+ and how tightly is it specified?
The MAX707EUA+ has a nominal reset threshold of 4.65V with guaranteed limits of 4.50V (min) and 4.75V (max) across the full -40°C to +85°C temperature range. This 50mV total tolerance ensures predictable reset activation during +5V supply droop while maintaining compatibility with standard logic supply margins. The threshold exhibits 40mV hysteresis to prevent chatter near the trip point.
Does the MAX707EUA+ support active-high reset for microprocessors like the Intel 80C51?
Yes, the MAX707EUA+ provides both active-high RESET (pin 7) and active-low RESET (pin 8) outputs simultaneously. The active-high RESET output is guaranteed valid down to VCC = 1.2V, making it directly compatible with μPs requiring high-asserted reset signals such as the Intel 80C51, certain ARM Cortex-M variants, and legacy 8-bit controllers.
Can the MAX707EUA+ monitor power supplies other than +5V?
Yes-the MAX707EUA+ includes a dedicated 1.25V precision comparator (PFI/PFO) that can monitor any DC voltage rail. By connecting PFI to a resistor divider from a +3.3V, +12V, or negative supply, the device generates a PFO interrupt when the monitored voltage crosses the 1.25V reference, enabling flexible power-fail or low-battery detection across multiple system rails.
What is the function of the N.C. pin (pin 6) on the MAX707EUA+?
Pin 6 on the MAX707EUA+ is explicitly designated as No Connect (N.C.)-it is an unbonded die pad with no internal connection. This pin must remain unconnected on the PCB; soldering or routing to it may cause functional interference, increased leakage, or ESD susceptibility. The µMAX package outline confirms this terminal is electrically isolated.
How does the manual-reset input (MR) behave during power-up and brownout conditions?
The MR input on the MAX707EUA+ features a 250μA internal pull-up current and TTL/CMOS-compatible thresholds (0.8V low, 2.0V high). It remains fully functional across the entire 1.2V–5.5V VCC range, allowing external pushbutton or logic signals to force reset even during brownout. MR-to-RESET propagation delay is guaranteed ≤250ns, ensuring deterministic response.
MAX707EUA+ 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:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX707EUA+ FAQ
1.How can I place an order for MAX707EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707EUA+ 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 MAX707EUA+ reliable?
The price and inventory of MAX707EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707EUA+ is usually 5 days.
3.What payment methods are accepted for MAX707EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707EUA+?
MAX707EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707EUA+ 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 MAX707EUA+?
For technical support, including MAX707EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707EUA+ requirements.
6.How does Aetrix verify that MAX707EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX707EUA+ 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 MAX707EUA+ meets industry standards.
7.What is the process for return or replacement of MAX707EUA+?
All MAX707EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX707EUA+, 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 MAX707EUA+ part is unused and in its original packaging.
Return procedure for MAX707EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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