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Analog Devices Inc./Maxim Integrated MAX709SCPA+
- Part No.:
- MAX709SCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX709SCPA+.pdf
- Description:
- IC SUPPLY MON W/RESET 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,258
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Product details
Overview
MAX709SCPA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +3V systems (2.93V nominal reset threshold), operating from 1.0V to 5.5V supply, delivering 140ms minimum power-on reset delay and guaranteed RESET state down to VCC = 1V. It eliminates external components in microprocessor supervisory circuits for embedded controllers and industrial logic systems.
For engineers reviewing the MAX709SCPA+ datasheet, MAX709SCPA+ pinout, MAX709SCPA+ application, or MAX709SCPA+ equivalent, key selection criteria include reset threshold tolerance (±1.5% over temperature), immunity to short negative VCC transients (<40µs at 100mV overdrive), low quiescent current (35µA typical), and compatibility with DIP/SO/µMAX packages across commercial and extended temperature ranges.
Technical Context
The MAX709SCPA+ integrates a precision voltage comparator, internal timing capacitor, and open-drain RESET driver - no external RC network required. Its reset threshold is factory-trimmed to 2.93V (S suffix) with ±1.5% accuracy over −40°C to +85°C, and it asserts RESET low during VCC brownout, power-up, and power-down events.
RESET remains valid and actively driven down to VCC = 1V; below that, it transitions to high-impedance. The device features 100V/µs VCC slew-rate immunity and is specified for continuous operation with VCC between −0.3V and +6.0V absolute maximum ratings.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (S suffix), ±1.5% over −40°C to +85°C - ensures reliable reset assertion before µP functional failure in +3V systems |
| Power-On Reset Delay | 140ms minimum - holds µP in reset long enough for stable clock and supply settling after VCC rise |
| Supply Current | 35µA typical at VCC = 3.6V - enables battery-backed or ultra-low-power monitoring without burdening supply |
| VCC Operating Range | 1.0V to 5.5V - supports operation during deep brownout and guarantees RESET state integrity down to 1V |
| RESET Output Type | Open-drain, 20mA sink capability - allows wired-OR configuration and level-shifting with external pull-up |
| Transient Immunity | Immune to <40µs negative VCC glitches ≥100mV below threshold - prevents spurious resets in noisy environments |
| Package | 8-pin plastic DIP (CPA), lead-free - RoHS-compliant, through-hole mountable with standard wave-solder compatibility |
Pinout & Package
MAX709SCPA+ is supplied in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and standard 0.1-inch pin spacing. Pin 1 is top-left corner (notch side), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect (N.C.) | No internal connection - must be left floating or tied to GND; no electrical function |
| 2 | VCC | Main supply input (1.0V–5.5V); powers internal comparator and timer - requires local 0.1µF bypass |
| 3 | GND | Analog ground reference for reset threshold detection and output stage - must be low-impedance path |
| 4 | N.C. | No internal connection - electrically isolated; no routing or termination required |
| 5 | N.C. | No internal connection - unused pin; no signal or power function |
| 6 | N.C. | No internal connection - not bonded; PCB pad may be omitted or grounded per layout preference |
| 7 | RESET | Active-low open-drain reset output - sinks current when asserted; requires external pull-up for logic-high idle state |
| 8 | N.C. | No internal connection - unconnected die bond pad; no electrical role in circuit operation |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated timing capacitor and precision voltage reference eliminate RC networks and trimming resistors |
| 140ms min power-on reset delay | Guaranteed minimum timeout ensures µP clocks and peripherals stabilize before release from reset |
| Reset valid down to VCC = 1V | Ensures deterministic reset behavior during deep brownout - avoids undefined µP states |
| Immunity to short VCC transients | Rejects <40µs negative glitches ≥100mV below threshold - improves reliability in electrically noisy systems |
| +3V system optimized | 2.93V reset threshold (S suffix) matches typical +3.0V ±5% rail tolerances without external scaling |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Power cycling during field firmware updates in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: System-level power supervisor asserting active-low RESET to ARM Cortex-M7 MCU until +3.3V rail stabilizes post-power-up. Use Value: 140ms guaranteed delay prevents premature code execution; 2.93V threshold aligns with 3.3V LDO dropout margin. |
Use Scenario: Battery-powered ultrasound probe with cold-start from depleted Li-ion (2.8V–3.6V range). IC Role / Device Role / Timing Role: Brownout detector holding reset on ADSP-BF533 DSP until VCC exceeds 2.93V and remains stable for ≥140ms. Use Value: Guaranteed RESET validity down to VCC = 1V avoids latch-up during partial discharge; 35µA supply current extends standby life. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Ignition-on power ramp in 12V-to-3.3V converted subsystems exposed to load-dump transients. IC Role / Device Role / Timing Role: Primary reset generator interfacing with Infineon AURIX TC275, rejecting sub-50µs VCC dips caused by relay switching noise. Use Value: Transient immunity specification (≤40µs at 100mV overdrive) prevents false resets during CAN bus activity and solenoid actuation. |
Use Scenario: Tamper-resistant meter with backup supercapacitor maintaining RTC and secure memory during AC mains loss. IC Role / Device Role / Timing Role: Dual-role supervisor - asserts RESET during main supply brownout and signals backup switchover via open-drain RESET line. Use Value: Open-drain output enables direct OR-ing with backup supervisor (e.g., MAX706R) for fail-safe redundancy without additional logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SCSA+ | Same 2.93V reset threshold and 140ms delay, but adds manual reset input (MR) and watchdog timer (WDT) timeout (1.6s) | Required where system-level software-initiated reset or periodic WDT supervision is needed | Select MAX706SCSA+ only if MR or WDT functionality is mandatory; otherwise MAX709SCPA+ offers lower cost and simpler BOM |
| TPS3808G30DBVR | 2.93V threshold, 200ms fixed delay, 1.6µA typical IQ, SOT-23-5 package - no N.C. pins, higher accuracy (±0.5%) | Better suited for space-constrained, ultra-low-power designs where DIP footprint is unacceptable | Choose TPS3808G30DBVR for PCB area reduction and sub-µA standby; retain MAX709SCPA+ for through-hole assembly and legacy DIP compatibility |
Compared with MAX706SCSA+, MAX709SCPA+ provides identical reset performance with lower component count and cost, but lacks manual reset and watchdog. Versus TPS3808G30DBVR, it trades ultra-low IQ and SMT footprint for proven DIP reliability and broader transient immunity margin.
Availability
MAX709SCPA+ is available at Aetrix Electronics and suitable for industrial control systems, medical handheld devices, automotive body electronics, and smart energy metering requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for MAX709SCPA+ 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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX709SCPA+ belongs to Maxim's µP supervisory circuit family, engineered specifically to replace discrete reset solutions in cost-sensitive, reliability-critical embedded systems powered by +3V, +3.3V, or +5V rails.
FAQ
What is the exact reset threshold voltage of the MAX709SCPA+?
The MAX709SCPA+ has a nominal reset threshold voltage of 2.93V, with guaranteed limits of 2.85V (min) and 3.00V (max) over the full operating temperature range (−40°C to +85°C). This value is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix S. The MAX709SCPA+ uses this precise threshold to supervise +3V systems without external resistor dividers.
Does the MAX709SCPA+ require external components to operate?
No, the MAX709SCPA+ requires no external components for basic reset functionality. It integrates an internal precision voltage reference, comparator, and timing capacitor. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for transient immunity but is not strictly required for DC operation. No pull-up resistor is included internally - an external pull-up is necessary on the open-drain RESET (pin 7) to establish a logic-high idle state.
Can the MAX709SCPA+ drive a microprocessor reset pin directly?
Yes, the MAX709SCPA+ can drive most microprocessor reset inputs directly via its open-drain RESET output (pin 7), provided an appropriate external pull-up resistor (typically 10kΩ to VCC) is used. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor between MAX709SCPA+ RESET and the µP pin prevents contention - as documented in Maxim's Application Information section.
What is the minimum VCC voltage at which the MAX709SCPA+ guarantees correct RESET output state?
The MAX709SCPA+ guarantees correct RESET output state (active-low assertion or high-impedance release) down to VCC = 1.0V. Below 1.0V, the RESET output becomes high-impedance and no longer sinks current. This ensures deterministic behavior during deep brownout conditions. If RESET validity down to 0V is required, a 100kΩ pull-down resistor on pin 7 is recommended per Maxim's Figure 2.
Is the MAX709SCPA+ pin-compatible with other MAX709 variants like MAX709LCPA+?
Yes, all MAX709 variants including MAX709SCPA+, MAX709LCPA+, and MAX709MCPA+ share identical 8-pin DIP pinouts and terminal functions - only the reset threshold voltage differs by suffix (L = 4.65V, M = 4.40V, S = 2.93V, etc.). No PCB layout change is needed when substituting within the same package type; only the reset threshold selection changes based on system rail voltage.
MAX709SCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX709SCPA+ FAQ
1.How can I place an order for MAX709SCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709SCPA+ 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 MAX709SCPA+ reliable?
The price and inventory of MAX709SCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709SCPA+ is usually 5 days.
3.What payment methods are accepted for MAX709SCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709SCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709SCPA+?
MAX709SCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709SCPA+ 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 MAX709SCPA+?
For technical support, including MAX709SCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709SCPA+ requirements.
6.How does Aetrix verify that MAX709SCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX709SCPA+ 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 MAX709SCPA+ meets industry standards.
7.What is the process for return or replacement of MAX709SCPA+?
All MAX709SCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709SCPA+, 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 MAX709SCPA+ part is unused and in its original packaging.
Return procedure for MAX709SCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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