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Analog Devices Inc./Maxim Integrated MAX708CPA+
- Part No.:
- MAX708CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX708CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:181
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Product details
Overview
MAX708CPA+ from Maxim Integrated is a microprocessor supervisory circuit providing active-high reset output, power-fail monitoring, manual-reset input, and watchdog timer disable (replaced by active-high RESET), with 4.40V reset threshold, 200ms reset pulse width, and guaranteed operation down to VCC = 1V. It monitors +5V supply integrity in embedded controllers and industrial instrumentation requiring reliable brownout detection and orderly shutdown.
For engineers reviewing the MAX708CPA+ datasheet, MAX708CPA+ pinout, MAX708CPA+ application, or MAX708CPA+ equivalent, this page delivers verified electrical parameters, package-specific terminal roles, real-world use cases for power-fail warning and manual reset assertion, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX708CPA+ implements a precision voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis to assert RESET during brownout, while its PFI comparator uses an internal 1.25V reference to detect external supply faults. The device integrates debounced TTL/CMOS-compatible MR input and guarantees valid RESET output at VCC as low as 1V.
Unlike the MAX705/MAX706 series, the MAX708 replaces the watchdog output (WDO) with an active-high RESET output - making it functionally distinct from watchdog-enabled variants. Its 8-pin PDIP package supports through-hole mounting with lead-free (RoHS-compliant) termination indicated by the '+' suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±150mV - triggers reset when +5V supply drops below nominal regulation limit |
| Reset Pulse Width | 200ms minimum - ensures microprocessor completes full reset initialization cycle |
| Supply Voltage Range | 1.0V to 5.5V - enables valid reset assertion during deep brownout down to 1V VCC |
| Power-Fail Input Threshold | 1.25V ±50mV - allows precise early-warning detection of auxiliary supply collapse |
| Manual-Reset Input Current | 100–600μA pull-up - permits direct connection to pushbutton without external resistor |
| Quiescent Supply Current | 50–350μA - minimizes standby power impact in battery-backed systems |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control environments |
Pinout & Package
MAX708CPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin 1 is located at the left end of the top row when viewed from the top with notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual-reset input | Drives internal reset generator when pulled below 0.8V; internally pulled up with 250μA current |
| 2 VCC | +5V supply input | Primary power rail; reset logic remains valid down to 1.0V on this pin |
| 3 GND | Ground reference | Common return for all analog and digital functions; required for accurate threshold sensing |
| 4 PFI | Power-fail input | Compares external voltage against 1.25V reference; asserts PFO when input falls below threshold |
| 5 PFO | Power-fail open-drain output | Sinks current when PFI < 1.25V; used to interrupt µP or trigger backup action |
| 6 N.C. | No connect | Internally unconnected; must remain floating or tied to GND per layout guidelines |
| 7 RESET | Active-high reset output | Complementary to RESET; drives high during normal operation, low during reset condition |
| 8 WDO | Watchdog output | Not functional in MAX708 - replaced by active-high RESET; must be left unconnected |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Ensures deterministic reset behavior during severe brownout before system power collapse |
| Debounced MR input with 140ms minimum pulse width | Eliminates need for external RC debounce circuitry when using mechanical pushbuttons |
| Precision 4.40V reset threshold with 40mV hysteresis | Prevents reset chatter near trip point during slow supply ramp-down or noise transients |
| 1.25V reference-based PFI comparator | Enables accurate monitoring of non-5V rails (e.g., +3.3V, +12V, or negative supplies) via external divider |
| Lead-free/RoHS-compliant packaging | Meets environmental compliance requirements for commercial electronics manufacturing |
Applications
| Industrial Controllers | Embedded Instrumentation |
|---|---|
Use Scenario: PLC I/O modules operating in factory environments with fluctuating 5V DC bus voltage. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to hold ARM Cortex-M4 core in known state during brownout. Use Value: Prevents spurious register writes or flash corruption when 5V rail dips below 4.40V due to motor startup surges. |
Use Scenario: Portable multimeter with lithium backup battery and dual-supply analog front-end. IC Role / Device Role / Timing Role: Power-fail detector using PFI to monitor main 9V battery; triggers PFO interrupt before voltage collapse. Use Value: Enables 200ms of controlled data save to EEPROM prior to complete power loss. |
| Computers & SBCs | Critical μP Power Monitoring |
Use Scenario: x86-compatible single-board computer with legacy ISA bus and discrete 5V regulator. IC Role / Device Role / Timing Role: Manual-reset supervisor providing hardware reset via front-panel button connected to MR pin. Use Value: Delivers 200ms clean reset pulse independent of software hang state, eliminating need for power-cycle. |
Use Scenario: Medical infusion pump controller where firmware crash could endanger patient safety. IC Role / Device Role / Timing Role: Reset generator ensuring CPU restart within 200ms if VCC drops below 4.40V during AC line sag. Use Value: Meets IEC 62304 Class C requirement for fail-safe recovery from undervoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CPA+ | Same 8-pin PDIP package and 4.65V reset threshold; includes both active-high and active-low RESET outputs | Required where µP accepts either reset polarity (e.g., Intel 80C51 vs. Motorola 68HC11) | Select MAX707CPA+ only if dual-polarity reset support is needed; MAX708CPA+ saves board space when only active-high is required |
| MAX813LCPA+ | Identical 4.65V reset threshold and active-high RESET, but retains watchdog timer (WDI/WDO) functionality | Suitable for systems requiring periodic firmware activity verification (e.g., remote telemetry nodes) | Choose MAX813LCPA+ when watchdog supervision is mandatory; MAX708CPA+ is preferred where watchdog adds unnecessary complexity |
Compared with MAX707CPA+, MAX708CPA+ simplifies design by omitting redundant active-low RESET, reducing pin count conflict in dense layouts; versus MAX813LCPA+, it removes watchdog circuitry to lower quiescent current and eliminate false timeout risks in static firmware deployments.
Availability
MAX708CPA+ is available at Aetrix Electronics and suitable for industrial controllers, embedded instrumentation, and critical μP power monitoring requiring stable component supply across commercial temperature range and RoHS-compliant assembly.
Supply support for MAX708CPA+ 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 power management, sensing, and interface applications in industrial, computing, and communications systems.
The MAX705–MAX708/MAX813L family delivers cost-optimized microprocessor supervisory functions - integrating reset generation, power-fail detection, manual reset, and watchdog capability into compact packages for space-constrained embedded control.
FAQ
What is the reset threshold voltage for MAX708CPA+?
The MAX708CPA+ has a nominal reset threshold of 4.40V with ±150mV tolerance and 40mV hysteresis. This value is factory-trimmed and guaranteed over the 0°C to +70°C operating temperature range. The threshold triggers an active-high RESET assertion whenever VCC falls below this level, ensuring reliable brownout protection for +5V systems. MAX708CPA+ maintains this specification without external components.
Does MAX708CPA+ include a functional watchdog timer?
No, MAX708CPA+ does not include a functional watchdog timer. Unlike MAX705/MAX706/MAX813L, the MAX708 variant replaces the watchdog output (WDO) with a second reset output (RESET). Pin 8 (WDO) is unused and must remain unconnected. MAX708CPA+ provides only power-on reset, brownout reset, manual reset, and power-fail warning functions - no timeout-based supervision.
Can MAX708CPA+ monitor voltages other than +5V?
Yes, MAX708CPA+ can monitor non-5V supplies using the PFI input and internal 1.25V reference. By connecting a resistive voltage divider from the target supply to PFI, users scale the monitored voltage to fall below 1.25V at the desired trip point. For example, a +12V rail can be monitored with a 10:1 divider to assert PFO when input drops below ~11V. MAX708CPA+ supports this configuration without additional ICs.
What is the minimum VCC required for valid RESET output in MAX708CPA+?
MAX708CPA+ guarantees valid active-high RESET output down to VCC = 1.0V. At this voltage, RESET remains a defined logic low (≤0.4V) when asserted and transitions cleanly upon release. This feature ensures deterministic reset behavior during deep brownout conditions where other supervisors may lose output control. The specification is tested and guaranteed across the full 0°C to +70°C temperature range.
Is MAX708CPA+ RoHS-compliant and lead-free?
Yes, MAX708CPA+ is RoHS-compliant and lead-free. The '+' suffix in the part number explicitly denotes lead(Pb)-free/RoHS-compliant packaging per Maxim Integrated's ordering convention. It uses matte tin lead finish on the 8-pin plastic DIP package and meets JEDEC J-STD-020 reflow profile requirements for lead-free soldering at +260°C peak temperature.
MAX708CPA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX708CPA+ FAQ
1.How can I place an order for MAX708CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708CPA+ 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 MAX708CPA+ reliable?
The price and inventory of MAX708CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708CPA+ is usually 5 days.
3.What payment methods are accepted for MAX708CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708CPA+?
MAX708CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708CPA+ 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 MAX708CPA+?
For technical support, including MAX708CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708CPA+ requirements.
6.How does Aetrix verify that MAX708CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX708CPA+ 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 MAX708CPA+ meets industry standards.
7.What is the process for return or replacement of MAX708CPA+?
All MAX708CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708CPA+, 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 MAX708CPA+ part is unused and in its original packaging.
Return procedure for MAX708CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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