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Analog Devices Inc./Maxim Integrated MAX709LCPA+
- Part No.:
- MAX709LCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX709LCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,857
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Product details
Overview
MAX709LCPA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +5V systems requiring 4.65V reset threshold, 140ms minimum power-on reset delay, and guaranteed operation down to VCC = 1V. It eliminates external components in microprocessor supervisory circuits for embedded controllers, industrial PLCs, and telecom power modules.
For engineers reviewing the MAX709LCPA+ datasheet, MAX709LCPA+ pinout, MAX709LCPA+ application, or MAX709LCPA+ equivalent, key selection criteria include reset threshold tolerance (±150mV), supply current (65µA at +5.5V), temperature range (0°C to +70°C), and compatibility with 8-pin plastic DIP packaging.
Technical Context
The MAX709LCPA+ integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET output driver. Its reset threshold is factory-trimmed to 4.65V ±150mV and remains stable over temperature (±0.02%/°C typical drift).
It delivers a minimum 140ms reset pulse after VCC rises above threshold and holds reset active during brownout conditions until VCC exceeds 4.50V. The device draws only 65µA supply current and tolerates VCC transients as short as 20µs without false triggering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V nominal (4.50V–4.75V min/max); ensures reliable detection of +5V rail collapse before µP malfunction. |
| Power-On Reset Delay | 140ms minimum; guarantees µP initialization completes before release from reset. |
| Supply Current | 65µA typical at VCC = 5.5V; enables low-power standby in battery-backed systems. |
| VCC Operating Range | 1.0V to 5.5V; supports valid RESET state down to 1V, critical for graceful shutdown sequencing. |
| Output Type | Open-drain RESET; allows wired-OR configuration and level translation with external pull-up. |
| Temperature Range | 0°C to +70°C; qualified for commercial-grade industrial control and networking equipment. |
| Package | 8-pin plastic DIP; compatible with through-hole assembly and legacy PCB layouts. |
Pinout & Package
MAX709LCPA+ uses an 8-pin plastic DIP package (0.300" wide) with lead-free finish (+ suffix). Pin 1 is top-left corner (notch side), pin numbering counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect (N.C.) | Internally unconnected; must remain floating or grounded per layout best practice-no routing required. |
| 2 | VCC | Main supply input; accepts +5V, +3.3V, or +3V; bypass capacitor (0.1µF) required adjacent to pin. |
| 3 | GND | Analog ground reference; must be tied directly to system ground plane with low-inductance path. |
| 7 | RESET | Active-low open-drain output; sinks ≥1.2mA at VCC = 4.50V; requires external pull-up for logic-high assertion. |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Integrated timing capacitor and precision reference eliminate R/C networks, reducing BOM count and layout area. |
| Immunity to short VCC transients | Withstands ≤40µs negative glitches 100mV below threshold-prevents spurious resets in noisy power environments. |
| Guaranteed RESET state down to 1V | Ensures deterministic behavior during brownout recovery, avoiding undefined µP states in partial-power conditions. |
| Low supply current (65µA) | Minimizes quiescent load on backup rails and extends battery life in always-on supervisory applications. |
| Factory-trimmed 4.65V threshold | Eliminates manual calibration; meets tight tolerance requirements for +5V system compliance without trimming. |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Power sequencing and fault recovery in modular I/O backplanes with distributed +5V supplies. IC Role / Device Role / Timing Role: System-level reset supervisor ensuring µP and FPGA initialize only after stable +5V rail. Use Value: Prevents firmware corruption during AC line dips by asserting reset for ≥140ms after VCC recovers above 4.50V. |
Use Scenario: Hot-swap power management in carrier-grade line cards with redundant +5V inputs. IC Role / Device Role / Timing Role: Brownout detector that forces controlled reboot when primary supply drops below 4.50V. Use Value: Enables automatic failover to backup supply without software intervention, meeting ITU-T G.8262 holdover requirements. |
| Embedded Medical Monitor | Point-of-Sale Terminal |
Use Scenario: Safety-critical boot validation in portable ECG and infusion pump controllers. IC Role / Device Role / Timing Role: Independent hardware reset source verifying main +5V rail integrity before enabling analog front-end. Use Value: Meets IEC 62304 Class C requirement for deterministic power-fail response with <200ms latency. |
Use Scenario: Retail terminal with battery-backed real-time clock and flash memory. IC Role / Device Role / Timing Role: Supervisor coordinating safe shutdown sequence when mains power fails. Use Value: Holds µP in reset while backup capacitor discharges, allowing full EEPROM write completion before VCC falls below 1V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706P | Same 4.65V threshold and 140ms delay, but includes watchdog timer and manual reset input. | Required where µP firmware hang detection or user-initiated reset is needed alongside power monitoring. | Select MAX706P if watchdog functionality is mandatory; MAX709LCPA+ offers lower cost and simpler layout when watchdog is unused. |
| TPS3808G33 | 3.3V reset threshold (not 4.65V); 200ms fixed delay; higher quiescent current (1.1µA vs 65µA). | Designed for +3.3V systems-not a direct functional substitute for +5V rail supervision. | Choose TPS3808G33 only for 3.3V applications; MAX709LCPA+ remains optimal for legacy +5V designs requiring precise 4.65V trip point. |
Compared with MAX706P and TPS3808G33, the MAX709LCPA+ provides the most cost-effective, minimal-footprint solution for dedicated +5V power monitoring without added complexity-ideal where watchdog or multi-rail support is unnecessary.
Availability
MAX709LCPA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, embedded medical monitors, and point-of-sale terminals requiring stable component supply and long-term obsolescence management.
Supply support for MAX709LCPA+ 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, communications, and computing markets.
The MAX709 family was engineered specifically for cost-sensitive, space-constrained microprocessor supervisory applications-delivering precision reset thresholds, guaranteed timing, and robust transient immunity in minimal footprint packages.
FAQ
What is the exact reset threshold voltage for MAX709LCPA+?
The MAX709LCPA+ has a nominal reset threshold of 4.65V, with guaranteed limits of 4.50V (minimum) and 4.75V (maximum) across the full operating temperature range (0°C to +70°C). This threshold is factory-trimmed and does not require external calibration or adjustment.
Does MAX709LCPA+ support operation below 1V VCC?
No-the MAX709LCPA+ guarantees correct RESET output state only down to VCC = 1V. Below 1V, the RESET output becomes high-impedance (open circuit) and no longer actively drives low. For applications requiring reset assertion down to 0V, a pull-down resistor on the RESET pin is recommended.
Can MAX709LCPA+ be used with +3.3V or +3V systems?
Yes-the MAX709LCPA+ operates over VCC = 1.0V to 5.5V and is explicitly specified for use with +5V, +3.3V, and +3V powered systems. However, its 4.65V reset threshold makes it appropriate only for +5V rail supervision; for lower-voltage rails, other suffix variants (e.g., MAX709R/S/T) are required.
What is the maximum allowable VCC transient duration that will not trigger reset on MAX709LCPA+?
For a 100mV negative-going VCC transient (i.e., VCC dropping 100mV below the 4.65V threshold), the MAX709LCPA+ tolerates pulses up to 40µs without issuing a false reset. Shorter transients (<20µs) are rejected even at larger amplitudes, per the device's built-in glitch immunity design.
Is MAX709LCPA+ pin-compatible with other MAX709 variants like MAX709MCPA+?
Yes-MAX709LCPA+, MAX709MCPA+, and all other MAX709 suffix variants share identical pinout, package, and electrical interface. Only the reset threshold voltage differs between L (4.65V), M (4.40V), T (3.08V), S (2.93V), and R (2.63V) versions; no PCB changes are needed when substituting within the same package and temperature grade.
MAX709LCPA+ 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, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX709LCPA+ FAQ
1.How can I place an order for MAX709LCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709LCPA+ 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 MAX709LCPA+ reliable?
The price and inventory of MAX709LCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709LCPA+ is usually 5 days.
3.What payment methods are accepted for MAX709LCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709LCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709LCPA+?
MAX709LCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709LCPA+ 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 MAX709LCPA+?
For technical support, including MAX709LCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709LCPA+ requirements.
6.How does Aetrix verify that MAX709LCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX709LCPA+ 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 MAX709LCPA+ meets industry standards.
7.What is the process for return or replacement of MAX709LCPA+?
All MAX709LCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709LCPA+, 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 MAX709LCPA+ part is unused and in its original packaging.
Return procedure for MAX709LCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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