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Analog Devices Inc./Maxim Integrated MAX707CPA+
- Part No.:
- MAX707CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX707CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:227
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Product details
Overview
MAX707CPA+ 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 4.65V reset threshold, 200ms reset pulse width, and guaranteed RESET validity down to VCC = 1V. It monitors +5V supply integrity in embedded controllers and industrial microprocessor systems.
For engineers reviewing the MAX707CPA+ datasheet, MAX707CPA+ pinout, MAX707CPA+ application, or MAX707CPA+ equivalent, key selection criteria include reset threshold accuracy (4.65V ±150mV), active-high reset polarity, absence of watchdog output, PFI comparator reference (1.25V), and DIP-8 package compatibility with legacy through-hole designs.
Technical Context
The MAX707CPA+ integrates four core supervisory functions: precision voltage monitoring with hysteresis (40mV), debounced TTL/CMOS-compatible manual-reset input (150ns minimum pulse width), 1.25V power-fail comparator for external rail monitoring, and active-high RESET output asserted when VCC falls below 4.65V or MR is pulled low.
Unlike the MAX705/MAX706, the MAX707CPA+ substitutes active-high RESET for watchdog output-no WDO pin is present-and retains PFO for power-fail warning. Its internal 250µA MR pull-up current enables direct pushbutton interface without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable reset assertion before +5V supply brownout affects µP operation |
| Reset Pulse Width | 200ms typical - meets Intel 80C51 and similar µP minimum reset duration requirements |
| Supply Voltage Range | 1.0V to 5.5V - guarantees RESET validity during ultra-low-VCC brownout recovery |
| PFI Threshold | 1.25V ±50mV - enables accurate power-fail detection on auxiliary rails via external divider |
| Supply Current | 50µA typical at VCC = 5V - supports low-power battery-backed systems |
| MR Input Threshold | 0.8V low / 2.0V high - compatible with TTL and CMOS logic levels without level-shifting |
| RESET Output Drive | ISINK = 1.2mA @ 0.4V - sufficient to drive standard µP reset inputs directly |
Pinout & Package
MAX707CPA+ 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 marked with a notch or dot; pin numbering follows standard counter-clockwise layout from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual-Reset Input | Active-low TTL/CMOS-compatible input with 250µA internal pull-up; triggers 200ms RESET pulse when pulled below 0.8V |
| 2 VCC | +5V Supply Input | Main power supply connection; device operates from 1.0V to 5.5V; RESET remains valid down to 1.0V |
| 3 GND | Ground Reference | 0V return path for all internal circuits and I/O pins |
| 4 PFI | Power-Fail Input | Comparator non-inverting input referenced to 1.25V; used to monitor auxiliary supplies (e.g., +12V via divider) |
| 5 PFO | Power-Fail Output | Open-drain active-low output asserting when PFI < 1.25V; sinks up to 3.2mA for µP interrupt signaling |
| 6 N.C. | No Connect | Internally unconnected pin; must be left floating or tied to GND per layout best practice |
| 7 RESET | Active-High Reset Output | Push-pull output asserting high during reset condition; compatible with µPs requiring active-high reset (e.g., 80C51) |
| 8 VCC | +5V Supply Input | Duplicate VCC pin for improved power delivery and reduced trace inductance in DIP layout |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET validity at VCC = 1V | Enables robust brownout recovery in low-voltage systems where supply may dip transiently below 2V |
| Debounced MR input with 150ns minimum pulse width | Eliminates need for external RC debounce circuitry when using mechanical pushbuttons |
| 1.25V precision PFI reference with ±50mV tolerance | Supports accurate early-warning power-fail detection on any DC rail using simple resistor divider |
| Active-high RESET output (no watchdog) | Direct interface to µPs requiring high-asserted reset (e.g., Intel 80C51, Zilog Z8) without external inverter |
| Lead-free/RoHS-compliant packaging (+ suffix) | Meets global environmental compliance requirements without performance or reliability trade-offs |
Applications
| Industrial PLC Controllers | Medical Diagnostic Equipment |
|---|---|
|
Use Scenario: Monitoring +5V rail in programmable logic controller CPU modules during mains fluctuation or backup battery switchover. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to hold µP in known state until stable VCC is confirmed. Use Value: Prevents spurious program execution during 10–100ms AC line sags by guaranteeing 200ms reset pulse even if VCC recovers within 50ms. |
Use Scenario: Power sequencing and fail-safe shutdown in portable ultrasound imaging units with dual Li-ion battery packs. IC Role / Device Role / Timing Role: PFI monitors battery voltage divider to trigger PFO interrupt before critical undervoltage threshold. Use Value: Enables 500ms firmware-controlled data save and safe state transition prior to complete power loss. |
| Telecom Remote Terminal Units | Automotive Body Control Modules |
|
Use Scenario: Supervising isolated +5V DC-DC converter output in outdoor telecom cabinets exposed to wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Active-high RESET ensures compatibility with TI MSP430F5xx µP reset input while tolerating VCC down to 1.0V. Use Value: Eliminates risk of µP lockup during cold-start voltage ramp due to guaranteed reset assertion below 2.0V. |
Use Scenario: Monitoring 5V supply derived from vehicle battery in BCMs managing door locks, lighting, and HVAC. IC Role / Device Role / Timing Role: MR input tied to ignition switch signal to force system reset on key-on transition. Use Value: Ensures deterministic µP initialization at every vehicle startup, independent of previous power-down state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX707CSA+ | Same electrical specs but in 8-pin SOIC package; no lead-to-lead compatibility with DIP footprint | Preferred for surface-mount production; requires PCB redesign for pad layout and thermal relief | Select MAX707CSA+ only when migrating to SMT assembly and reworking layout is feasible. |
| MAX813LCPA+ | Includes watchdog timer (WDO) and active-high RESET; identical 4.65V threshold and 200ms pulse width | Required where µP watchdog supervision is mandatory (e.g., ISO 26262 ASIL-B systems) | Choose MAX813LCPA+ if watchdog functionality is needed; MAX707CPA+ lacks WDO and cannot substitute. |
Compared with MAX707CPA+, MAX707CSA+ offers identical supervision features in SOIC for space-constrained boards, while MAX813LCPA+ adds watchdog capability at the cost of increased complexity-neither is pin-compatible, and both require explicit functional validation for drop-in replacement.
Availability
MAX707CPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic equipment, telecom remote terminal units, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX707CPA+ 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 analog and mixed-signal ICs for power management, sensing, and interface applications.
The MAX705–MAX708 family was designed specifically for cost-sensitive microprocessor supervisory functions in industrial, computing, and instrumentation systems-emphasizing integration, reliability, and ease of use over programmability.
FAQ
What is the reset threshold voltage for MAX707CPA+ and how tightly is it specified?
The MAX707CPA+ has a nominal reset threshold of 4.65V with a guaranteed tolerance of ±150mV (4.50V to 4.75V) over the full operating temperature range (0°C to +70°C). This specification ensures consistent reset behavior across voltage and temperature variations in +5V systems, and is validated per Maxim's Electrical Characteristics table in the official datasheet.
Does MAX707CPA+ include a watchdog timer function?
No, the MAX707CPA+ does not include a watchdog timer. Unlike the MAX705/MAX706/MAX813L, the MAX707CPA+ replaces the watchdog output (WDO) with an active-high RESET output. Pin 6 is designated N.C. (no connect), and there is no watchdog timeout period or WDI input-this is a deliberate functional distinction confirmed in the Pin Description and Block Diagram sections of the datasheet.
Can MAX707CPA+ monitor voltages other than +5V, such as +12V or negative rails?
Yes, MAX707CPA+ can monitor non-+5V rails using its PFI input. The internal 1.25V comparator reference allows external resistor dividers to scale higher voltages (e.g., +12V) down to the 1.25V threshold. For negative rails, the datasheet provides a verified circuit using an external transistor and resistors to invert the PFO logic-enabling reliable negative supply monitoring with documented accuracy dependencies.
What is the minimum supply voltage at which MAX707CPA+ guarantees valid RESET output?
The MAX707CPA+ guarantees valid RESET output down to VCC = 1.0V, as explicitly stated in the Benefits and Features section and confirmed in the Electrical Characteristics table. At VCC = 1.0V, RESET remains a logic-low output (≤0.3V) with ISINK = 50µA, enabling robust operation during deep brownout conditions where many µPs lose functionality above 1.5V.
Is MAX707CPA+ RoHS-compliant and what does the '+' suffix indicate?
Yes, the '+' suffix in MAX707CPA+ denotes lead-free, RoHS-compliant packaging per Maxim Integrated's ordering conventions. This version uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1) requirements. The '+' is required at order time to specify RoHS compliance-standard MAX707CPA (without '+') is leaded.
MAX707CPA+ 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:
- 4.65V
- 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
MAX707CPA+ FAQ
1.How can I place an order for MAX707CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX707CPA+ 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 MAX707CPA+ reliable?
The price and inventory of MAX707CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX707CPA+ is usually 5 days.
3.What payment methods are accepted for MAX707CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX707CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX707CPA+?
MAX707CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX707CPA+ 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 MAX707CPA+?
For technical support, including MAX707CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX707CPA+ requirements.
6.How does Aetrix verify that MAX707CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX707CPA+ 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 MAX707CPA+ meets industry standards.
7.What is the process for return or replacement of MAX707CPA+?
All MAX707CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX707CPA+, 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 MAX707CPA+ part is unused and in its original packaging.
Return procedure for MAX707CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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