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Analog Devices Inc./Maxim Integrated MAX708EPA+
- Part No.:
- MAX708EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX708EPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,508
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Product details
Overview
The MAX708EPA+ from Maxim Integrated is an industrial-grade microprocessor supervisory circuit in 8-pin PDIP package, providing active-high reset output, 4.40V supply-voltage monitoring threshold, 1.6s watchdog timeout, 1.25V power-fail comparator input, and debounced manual-reset input. It ensures reliable µP startup and brownout recovery in embedded controllers and critical instrumentation.
For engineers reviewing the MAX708EPA+ datasheet, MAX708EPA+ pinout, MAX708EPA+ application, or MAX708EPA+ equivalent, key selection factors include its -40°C to +85°C operating range, guaranteed RESET validity down to VCC = 1.2V, 200ms reset pulse width, and compatibility with TTL/CMOS logic interfaces in space-constrained industrial designs.
Technical Context
The MAX708EPA+ integrates a precision voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis, a 1.6s watchdog timer with 50ns minimum WDI pulse detection, and a 1.25V reference-based power-fail comparator. Its active-high RESET output remains valid at VCC as low as 1.2V, enabling robust reset assertion during deep brownout conditions.
Unlike the MAX705/MAX706 series, the MAX708EPA+ omits the watchdog output (WDO) and substitutes an active-high RESET output - identical in function to the MAX707/MAX708 family. The MR input features internal 250µA pull-up and 150ns minimum pulse width tolerance, supporting direct pushbutton or logic-level triggering without external debounce circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset when +5V supply drops below nominal regulation limit, ensuring µP halts before logic corruption |
| Reset Pulse Width | 200ms typical - guarantees sufficient duration for full µP initialization and peripheral stabilization |
| Watchdog Timeout | 1.6s ±650ms - provides deterministic software activity monitoring window for embedded firmware supervision |
| Power-Fail Input Threshold | 1.25V ±50mV - enables accurate early-warning detection of +5V rail collapse or battery depletion |
| Supply Current (Active) | 50µA typical at VCC = 5V - minimizes standby power draw in battery-backed systems |
| Operating Temperature | -40°C to +85°C - supports deployment in industrial control cabinets and outdoor telemetry equipment |
| VCC Validity for RESET | Guaranteed functional down to 1.2V - maintains reset assertion through severe undervoltage transients |
Pinout & Package
MAX708EPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is lead-free/RoHS-compliant (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible trigger with internal 250µA pull-up; debounces pushbutton switches without external RC network |
| 2 VCC | +5V Supply Input | Primary power rail connection; powers all internal comparators, timers, and outputs; accepts 1.2V–5.5V for backup-mode operation |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance to ensure accurate threshold sensing |
| 4 PFI | Power-Fail Input | High-impedance comparator input referenced to 1.25V; monitors auxiliary rails (e.g., +12V via divider) or battery voltage |
| 5 PFO | Power-Fail Output | Open-drain active-low output that sinks current when PFI < 1.25V; used for NMI generation or system shutdown sequencing |
| 6 RESET | Active-High Reset Output | Push-pull CMOS output asserting high during reset; compatible with Intel 80C51 and other µPs requiring active-high reset polarity |
| 7 RESET | Active-Low Reset Output | Complementary inverted output to pin 6; provides flexibility for mixed-logic systems or level-shifting requirements |
| 8 WDO | Watchdog Output | Open-drain active-low output asserted after 1.6s watchdog timeout; also pulls low during VCC brownout independent of timer state |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Supervisory Functions | Combines reset generation, watchdog timing, power-fail warning, and manual reset in single 8-pin IC - eliminates 4+ discrete components and reduces PCB area by >65% |
| Guaranteed RESET Validity | RESET output remains functional down to VCC = 1.2V - ensures fail-safe behavior during extended brownout events where other supervisors lose control |
| Debounced Manual-Reset Input | MR pin tolerates 150ns minimum pulse width and includes internal 250µA pull-up - enables direct switch connection without external filtering |
| Precision Voltage Monitoring | 4.40V reset threshold with ±150mV tolerance and 40mV hysteresis - prevents reset chatter near trip point during noisy supply conditions |
| Low-Power Operation | 50µA typical supply current - extends battery life in portable instrumentation and remote sensor nodes |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Programmable logic controller operating in factory-floor environments with fluctuating 24VDC supplies and EMI exposure. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to ARM Cortex-M7 µP during 24V-to-5V regulator dropout or transient overvoltage. Use Value: Prevents corrupted I/O register writes and firmware crashes by holding µP in known state until regulated +5V stabilizes above 4.40V for ≥200ms. |
Use Scenario: Portable ultrasound device powered by Li-ion battery with dual-rail DC-DC conversion (5V/3.3V). IC Role / Device Role / Timing Role: Monitoring main 5V rail and battery voltage via PFI divider; generating PFO interrupt to initiate safe data save before shutdown. Use Value: Enables 200ms grace period for nonvolatile memory write completion and display fade-out, meeting IEC 62304 power-loss safety requirements. |
| Automotive Telematics Gateway | Smart Energy Meter |
Use Scenario: CAN-based vehicle communication module exposed to cold-crank (4.5V) and load-dump (40V) transients. IC Role / Device Role / Timing Role: Providing brownout reset during cold-crank while ignoring short-duration spikes using 40mV hysteresis and 200ms pulse width. Use Value: Avoids false resets during engine start while guaranteeing µP restart only after stable 5V rail reestablishment - critical for OTA update integrity. |
Use Scenario: ANSI C12.20-certified electricity meter with backup supercapacitor and real-time clock. IC Role / Device Role / Timing Role: Detecting main AC-DC converter failure via PFI; asserting RESET to halt计量 processing and switch to backup power path. Use Value: Maintains metrological accuracy by freezing energy accumulation registers and preserving timekeeping during primary power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707EPA+ | Identical pinout, same 4.40V reset threshold and -40°C to +85°C rating, but includes both active-high and active-low RESET outputs (dual-output variant) | Required where system design needs simultaneous assertion of complementary reset signals to multiple IC families | Select MAX707EPA+ if dual RESET polarity is needed; otherwise MAX708EPA+ offers identical core functionality at lower cost |
| TPS3808G33DBVR | 3.3V fixed reset threshold, 200ms pulse width, 1.8µA quiescent current, SOT-23-6 package - no watchdog or PFI/PFO functions | Suitable only for simple reset-only applications without power-fail warning or software supervision capability | Choose TPS3808G33DBVR for ultra-low-power, single-threshold reset in compact layouts; avoid when watchdog or PFI monitoring is required |
Compared with MAX707EPA+, the MAX708EPA+ removes redundant RESET output to reduce cost while retaining identical supervision accuracy and timing. Against TPS3808G33DBVR, it delivers full-feature supervision (watchdog, PFI, dual reset) at higher quiescent current but essential for complex µP systems requiring fault resilience beyond basic reset.
Availability
MAX708EPA+ is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive telematics, and smart metering applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX708EPA+ 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 markets, emphasizing reliability, integration, and ruggedized performance.
The MAX705–MAX708/MAX813L product line delivers cost-optimized µP supervisory circuits targeting space-constrained embedded systems needing guaranteed reset behavior under voltage stress and software fault conditions.
FAQ
What is the reset threshold voltage for MAX708EPA+?
The MAX708EPA+ has a nominal reset threshold of 4.40V with ±150mV tolerance and 40mV hysteresis. This value is factory-trimmed and guaranteed over the full -40°C to +85°C operating temperature range. The threshold applies to the VCC supply monitoring function and directly determines when the RESET outputs assert during brownout conditions. This specification ensures consistent behavior across production units without requiring external calibration.
Does MAX708EPA+ include a watchdog timer?
Yes, the MAX708EPA+ includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer resets on any rising or falling edge at the WDI pin and asserts WDO low if no transition occurs within the timeout window. Unlike some variants, the MAX708EPA+ retains full watchdog functionality while providing active-high RESET output - making it suitable for µPs requiring both supervision and reset polarity compatibility.
What is the minimum VCC voltage at which MAX708EPA+ guarantees RESET output validity?
The MAX708EPA+ guarantees functional RESET output down to VCC = 1.2V across the full -40°C to +85°C temperature range. At this voltage, the active-high RESET output remains valid with specified sink/source capability, enabling reliable reset assertion during deep undervoltage events where other supervisors cease operation. This feature is explicitly tested and guaranteed per the datasheet's Electrical Characteristics table.
Can MAX708EPA+ monitor voltages other than the main VCC supply?
Yes, the MAX708EPA+ can monitor auxiliary voltages using its PFI (Power-Fail Input) pin, which compares against an internal 1.25V reference. By connecting a resistor divider from the target voltage rail to PFI, users can configure early-warning detection for +12V, battery, or negative supplies. The PFO output then signals degradation, and connecting PFO to MR allows automatic reset initiation - all without modifying the core reset threshold.
What package type does MAX708EPA+ use and is it RoHS-compliant?
The MAX708EPA+ uses an 8-pin plastic DIP (PDIP) package with 0.3-inch body width and through-hole leads. The '+' suffix in the part number explicitly denotes lead-free/RoHS-compliant construction per Maxim Integrated's ordering conventions. This package meets JEDEC MS-001 standards and supports wave soldering at 240°C peak temperature for lead-containing processes or 260°C for lead-free reflow.
MAX708EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX708EPA+ FAQ
1.How can I place an order for MAX708EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708EPA+ 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 MAX708EPA+ reliable?
The price and inventory of MAX708EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708EPA+ is usually 5 days.
3.What payment methods are accepted for MAX708EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708EPA+?
MAX708EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708EPA+ 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 MAX708EPA+?
For technical support, including MAX708EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708EPA+ requirements.
6.How does Aetrix verify that MAX708EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX708EPA+ 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 MAX708EPA+ meets industry standards.
7.What is the process for return or replacement of MAX708EPA+?
All MAX708EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708EPA+, 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 MAX708EPA+ part is unused and in its original packaging.
Return procedure for MAX708EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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