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Analog Devices Inc./Maxim Integrated MAX708EUA
- Part No.:
- MAX708EUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708EUA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:10,269
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Product details
Overview
The MAX708EUA from Maxim Integrated is an industrial-grade microprocessor supervisory circuit in 8-pin µMAX package, providing active-high reset output, 4.40V supply-voltage monitoring threshold, 1.6s watchdog timeout, power-fail warning via 1.25V PFI comparator, and debounced manual-reset input - used for reliable power-up/power-down sequencing and brownout protection in embedded controllers and intelligent instrumentation.
For engineers reviewing the MAX708EUA datasheet, MAX708EUA pinout, MAX708EUA application, or MAX708EUA equivalent, this page delivers verified electrical parameters, thermal operating range (–40°C to +85°C), µMAX package footprint details, and functionally matched alternatives for μP reset supervision in space-constrained industrial systems.
Technical Context
The MAX708EUA integrates a precision voltage monitor with 4.40V reset threshold and 40mV hysteresis, a 1.6s watchdog timer with edge-sensitive WDI input (50ns pulse detection), and a 1.25V reference-based power-fail comparator driving open-drain PFO. Its RESET output remains valid down to VCC = 1.2V with ISINK = 100μA.
Unlike the MAX705/MAX706 series, the MAX708EUA substitutes active-high RESET for watchdog functionality while retaining WDO as a separate low-line indicator. It operates across VCC = 4.5V to 5.5V and draws only 50μA (typ) to 500μA (max) quiescent current in extended temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±0.15V - triggers reset when +5V rail drops below safe logic level for μP operation |
| Reset Pulse Width | 200ms (min 140ms) - ensures sufficient hold time for full μP initialization after power recovery |
| Watchdog Timeout | 1.6s ±0.65s - provides deterministic software liveliness check without requiring external timing components |
| PFI Threshold | 1.25V ±0.05V - enables accurate early-warning detection of power-fail or low-battery conditions |
| Supply Voltage Range | 4.5V to 5.5V - compatible with standard +5V linear regulators and tolerant of transient droop |
| Operating Temperature | –40°C to +85°C - qualified for industrial control and automotive under-hood auxiliary systems |
| Quiescent Current | 50μA (typ), 500μA (max) - enables long-term battery-backed operation in backup-monitoring applications |
Pinout & Package
MAX708EUA uses an 8-pin µMAX package (outline 21-0036), 3.0mm × 3.0mm body, 0.5mm pitch, exposed pad for thermal enhancement. Pin 1 marked by dot; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WDO) | Watchdog Output | Open-drain output pulled low on timeout or VCC brownout; used for NMI assertion or low-line indication |
| 2 (RESET) | Active-High Reset Output | CMOS-compatible push-pull output asserted high during reset; valid down to VCC = 1.2V |
| 3 (WDI) | Watchdog Input | Edge-triggered input - rising/falling edges reset internal 1.6s timer; floating disables watchdog |
| 4 (PFO) | Power-Fail Output | Open-drain output low when PFI < 1.25V; drives interrupt line or external logic for orderly shutdown |
| 5 (PFI) | Power-Fail Input | High-impedance comparator input referenced to 1.25V; accepts voltage divider for multi-rail monitoring |
| 6 (GND) | Ground Reference | Common return for all analog and digital functions; must be low-impedance connection to system ground plane |
| 7 (VCC) | +5V Supply Input | Primary power rail input; supplies internal reference, comparators, and output drivers |
| 8 (MR) | Manual-Reset Input | Active-low TTL/CMOS-compatible input with 250μA internal pull-up; debounced by 140ms minimum reset pulse |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1.2V | Enables robust reset assertion during deep brownout, preventing μP lockup before full power collapse |
| 1.25V precision PFI reference | Supports accurate power-fail detection across multiple supply rails using external resistor dividers |
| Debounced MR input with 140ms min pulse | Eliminates need for external RC debounce circuitry when using mechanical pushbutton switches |
| µMAX 8-pin package (3mm × 3mm) | Reduces PCB area by >60% vs. SO-8; suitable for compact industrial modules and portable instrumentation |
| 40mV reset threshold hysteresis | Prevents oscillatory reset assertion during slow VCC ramp-up or marginal supply conditions |
Applications
| Industrial PLC I/O Modules | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Real-time monitoring of +5V and +12V rails in programmable logic controller backplanes with hot-swap capability. IC Role / Device Role / Timing Role: Supervisory IC asserting active-high RESET to ARM Cortex-M7 processor and latching PFO interrupt for firmware-initiated graceful shutdown. Use Value: Prevents corrupted register writes during undervoltage events; 4.40V threshold matches industrial +5V regulator tolerance (±4%). |
Use Scenario: Battery-backed data acquisition subsystem in portable ultrasound units requiring fail-safe power sequencing. IC Role / Device Role / Timing Role: Dual-role device: monitors main supply via VCC and battery voltage via PFI divider; asserts RESET on brownout and triggers PFO-driven save-to-Flash routine. Use Value: 50μA typical supply current extends backup runtime; 1.25V PFI reference enables precise Li-ion cell voltage monitoring at 3.0V cutoff. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: Cold-cranking support in 12V vehicle networks where alternator dropout causes transient dips below 4.5V. IC Role / Device Role / Timing Role: Resets microcontroller and disables CAN transceivers via RESET signal; uses WDO as secondary low-line flag independent of watchdog state. Use Value: –40°C to +85°C rating meets AEC-Q100 Grade 3 requirements; 200ms reset pulse exceeds ISO 16750-2 cold-crank timing. |
Use Scenario: Tamper-resistant metering platform with dual-supply monitoring (main AC-DC + supercapacitor backup). IC Role / Device Role / Timing Role: Detects main supply failure via PFI, asserts RESET to halt计量 operations, and signals PFO to initiate secure EEPROM logging before backup depletion. Use Value: 40mV hysteresis prevents false resets during line noise; 1.6s watchdog enforces firmware health checks during extended backup mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar μP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708CUA | Same functionality and pinout, but rated for 0°C to +70°C only; lower max supply current (350μA vs. 500μA) | Suitable for commercial-grade consumer electronics; not qualified for industrial ambient extremes | Select MAX708CUA only if operating temperature stays within 0°C–70°C and lower quiescent current is prioritized |
| MAX809SEUR+T | Single-function reset IC (no watchdog, no PFI); 4.40V threshold; SOT23-3 package; 1.6μA typical supply current | Lacks power-fail warning and software watchdog - limited to basic reset-only use cases | Choose MAX809SEUR+T only when board space is critical and supervisory features beyond reset are handled elsewhere |
Compared with MAX708CUA and MAX809SEUR+T, the MAX708EUA uniquely combines industrial temperature range, integrated watchdog, and precision power-fail detection in a miniature µMAX package - making it irreplaceable for compact, feature-complete μP supervision in harsh environments.
Availability
MAX708EUA is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic equipment, automotive body control units, smart energy meters, and critical μP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX708EUA 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 industrial, communications, and computing applications, with emphasis on reliability and integration.
The MAX705–MAX708/MAX813L family delivers cost-optimized, single-chip μP supervision - targeting space-constrained embedded systems needing guaranteed reset, watchdog, and power-fail functions without external components.
FAQ
What is the reset threshold voltage of the MAX708EUA?
The MAX708EUA has a nominal reset threshold of 4.40V with ±0.15V tolerance over temperature. This value is factory-trimmed and guaranteed across the full –40°C to +85°C operating range. The threshold applies to the VCC supply input and triggers the active-high RESET output when VCC falls below this level. Hysteresis of 40mV prevents chatter during slow supply ramps.
Does the MAX708EUA include a watchdog timer?
No - the MAX708EUA does not include a functional watchdog timer. Unlike the MAX705/MAX706/MAX813L, the MAX707/MAX708 variants replace the watchdog circuit with a second reset output (RESET). The WDI pin on MAX708EUA is unconnected internally, and WDO serves only as a low-line indicator tied to VCC status, not as a programmable watchdog output.
Can the MAX708EUA monitor voltages other than +5V?
Yes - the MAX708EUA can monitor auxiliary voltages using its PFI input. By connecting a resistor divider between the target voltage rail and GND, the voltage at PFI is scaled to match the 1.25V internal reference. For example, a +12V rail can be monitored with a 9.6kΩ/1.2kΩ divider to yield 1.25V at PFI when the rail reaches ~10.87V. PFO then asserts to signal impending failure.
What is the minimum VCC required for valid RESET output on the MAX708EUA?
The MAX708EUA guarantees valid RESET output down to VCC = 1.2V, specified with ISINK = 100μA. At this voltage, RESET remains a well-defined logic high (≥VCC – 1.5V) and low (≤0.3V) - enabling reliable reset assertion even during severe brownout conditions before complete power collapse. This specification is tested and guaranteed over the full –40°C to +85°C range.
Is the MAX708EUA pin-compatible with other devices in the MAX70x family?
Yes - the MAX708EUA shares identical pinout and package (8-pin µMAX) with MAX705EUA, MAX706EUA, MAX707EUA, and MAX813LEUA. However, internal functionality differs: MAX708EUA provides active-high RESET and WDO as low-line indicator, while MAX705EUA offers active-low RESET and functional watchdog. Direct substitution requires verification of required features per application.
MAX708EUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX708EUA FAQ
1.How can I place an order for MAX708EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708EUA 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 MAX708EUA reliable?
The price and inventory of MAX708EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708EUA is usually 5 days.
3.What payment methods are accepted for MAX708EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708EUA?
MAX708EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708EUA 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 MAX708EUA?
For technical support, including MAX708EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708EUA requirements.
6.How does Aetrix verify that MAX708EUA is sourced from the original manufacturer or authorized distributors?
All MAX708EUA 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 MAX708EUA meets industry standards.
7.What is the process for return or replacement of MAX708EUA?
All MAX708EUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708EUA, 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 MAX708EUA part is unused and in its original packaging.
Return procedure for MAX708EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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