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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:2,833
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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 reset timeout, and operation down to 1V supply. It eliminates external components in microprocessor supervisory circuits for embedded controllers, industrial PLCs, and telecom line cards.
For engineers reviewing the MAX709LCPA datasheet, MAX709LCPA pinout, MAX709LCPA application, or MAX709LCPA equivalent, key selection criteria include reset threshold accuracy (±150mV), guaranteed RESET state at VCC ≥1V, immunity to sub-40µs negative VCC transients, and compatibility with 8-pin DIP packaging for legacy board layouts.
Technical Context
The MAX709LCPA integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET driver. Its reset threshold is factory-trimmed to 4.65V (min 4.50V, max 4.75V) and exhibits ±0.3% typical drift over –40°C to +85°C.
It delivers a guaranteed minimum 140ms reset pulse width after VCC rises above threshold, with no external timing components required. The device draws only 65µA typical supply current and remains functional with VCC as low as 1.0V, ensuring deterministic reset behavior during brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V nominal (4.50V–4.75V range); ensures reliable detection of +5V rail collapse before µP corruption |
| Reset Timeout | 140ms min after VCC rise; meets Intel-compatible power-on reset timing requirements |
| Supply Voltage Range | 1.0V to 5.5V; guarantees RESET validity during deep brownout and full-power operation |
| Supply Current | 65µA typical at 5.5V; enables battery-backed systems with multi-year standby life |
| RESET Output Type | Open-drain, 20mA sink capability; supports wired-OR reset buses and level translation |
| Operating Temp | 0°C to +70°C; validated for commercial-grade industrial control and networking equipment |
| Transient Immunity | Immune to ≤40µs negative VCC glitches ≥100mV below threshold; reduces false resets in noisy environments |
Pinout & Package
MAX709LCPA is supplied in an 8-pin plastic DIP package (0.300" wide), with pins 1, 4, 5, 6, and 8 internally unconnected. Pin 2 supplies VCC, pin 3 is GND, and pin 7 provides the active-low open-drain RESET signal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, 4, 5, 6, 8 | No Connect | No internal connection; must be left floating or tied to GND per layout best practice |
| Pin 2 | VCC Supply Input | Accepts 1.0V–5.5V; powers internal comparator and timer; requires 0.1µF bypass capacitor |
| Pin 3 | GND Reference | Analog and digital ground reference; must connect to system ground plane with low-inductance path |
| Pin 7 | RESET Output | Active-low open-drain signal; requires external pull-up to VCC or another logic rail |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65V Reset Threshold | Factory-trimmed comparator ensures ±150mV tolerance at 25°C and minimal drift over temperature |
| 140ms Minimum Reset Pulse Width | Internally timed delay guarantees µP initialization completes before release from reset |
| Operation Down to 1.0V VCC | RESET remains valid and asserted even during severe brownout, preventing partial execution |
| 8-Pin DIP Compatibility | Direct drop-in replacement for legacy supervisory circuits without PCB redesign |
| 35µA–65µA Ultra-Low Quiescent Current | Enables always-on monitoring in energy-constrained applications without measurable battery drain |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Power sequencing and fault recovery in modular I/O chassis with multiple +5V domains. IC Role / Device Role / Timing Role: Primary power-good monitor asserting system-wide reset on main 5V rail undervoltage. Use Value: Prevents firmware lockup during AC mains interruption by guaranteeing 140ms reset hold time independent of external RC networks. | Use Scenario: Supervision of FPGA configuration voltage and DSP core supply in carrier-grade access equipment. IC Role / Device Role / Timing Role: Brownout detector for +5V auxiliary rails powering clock distribution and interface buffers. Use Value: Eliminates need for discrete comparator + timer circuit, reducing BOM count by 4 components and saving 12mm² PCB area. |
| Embedded Medical Device | Legacy Industrial HMI |
Use Scenario: Ensuring safe boot sequence in battery-powered diagnostic instruments with dual 3.3V/5V supplies. IC Role / Device Role / Timing Role: Standby-mode supervisor maintaining reset assertion until both rails stabilize post-battery insertion. Use Value: Guarantees RESET remains asserted down to VCC = 1.0V, enabling fail-safe shutdown when battery drops below 3.0V. | Use Scenario: Retrofitting reset supervision into aging human-machine interface panels using through-hole assembly. IC Role / Device Role / Timing Role: Direct replacement for obsolete MC34064-based reset circuits in 8-pin DIP footprints. Use Value: Maintains identical pinout and timing while improving threshold accuracy from ±5% to ±3.2% and reducing supply current by 60%. |
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 reset threshold, but rated for –40°C to +85°C and offered in SO/µMAX only | Requires PCB redesign for SO-8 or µMAX footprint; not DIP-compatible | Select when extended temperature range or surface-mount assembly is mandatory |
| MAX809L | 4.63V threshold (±1.5%), 140ms timeout, 35µA supply current, but no N.C. pins - 5-pin SOT23 package | Not pin-compatible; lacks GND/VCC separation needed for noise-sensitive analog sections | Select for space-constrained designs where board area is critical and DIP footprint is unnecessary |
Compared with MAX709LCPA, MAX706P offers wider temperature support but requires package conversion, while MAX809L saves board space at the cost of reduced noise immunity and no DIP option-making MAX709LCPA optimal for commercial-grade through-hole retrofits and noise-critical industrial controls.
Availability
MAX709LCPA is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, embedded medical devices, and legacy industrial HMI systems 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 U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs for power, sensing, and connectivity applications.
The MAX709 family was engineered specifically for cost-sensitive, high-reliability microprocessor supervisory functions in commercial and industrial equipment, emphasizing zero-external-component operation and robust transient immunity.
FAQ
What is the exact reset threshold voltage for MAX709LCPA?
The MAX709LCPA has a nominal reset threshold of 4.65V, with a guaranteed range of 4.50V to 4.75V across temperature and process variation. This value is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix L. The threshold remains stable over the 0°C to +70°C operating range with less than ±0.3% drift, making it suitable for precise +5V rail monitoring in MAX709LCPA-based systems.
Does MAX709LCPA require external components to function?
No, MAX709LCPA operates autonomously with no external resistors, capacitors, or timing components required. Its 140ms reset timeout is generated by an internal oscillator and capacitor, and its 4.65V threshold is laser-trimmed during manufacturing. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for noise immunity but is not strictly required for basic functionality-making MAX709LCPA a true single-chip solution for MAX709LCPA reset supervision.
Can MAX709LCPA drive a microprocessor reset pin directly?
Yes, MAX709LCPA can drive most µP reset pins directly via its open-drain RESET output (pin 7), provided an external pull-up resistor (typically 10kΩ to VCC) is used. The output sinks up to 20mA and guarantees logic-low state down to VCC = 1.0V. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor between MAX709LCPA RESET and the µP pin prevents contention-details are documented in the MAX709LCPA Applications Information section.
What is the supply current consumption of MAX709LCPA?
MAX709LCPA consumes 65µA typical supply current at VCC = 5.5V and TA = +25°C, with a maximum of 200µA across the full temperature and voltage range. This ultra-low quiescent current enables MAX709LCPA to serve as a permanent supervisory element in battery-backed or energy-harvesting systems without impacting standby lifetime-verified in the "Supply Current" row of the MAX709LCPA Electrical Characteristics table.
Is MAX709LCPA compatible with 3.3V or 3V systems?
No, MAX709LCPA is specifically calibrated for +5V systems with a 4.65V reset threshold and is not intended for 3.3V or 3V operation. For those voltages, Maxim offers the MAX709M (4.40V), MAX709T (3.08V), or MAX709S (2.93V) variants. Using MAX709LCPA on a 3.3V rail would cause continuous reset assertion since VCC never exceeds the 4.65V threshold-confirming that MAX709LCPA is strictly a +5V supervisory device.
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:
- Obsolete
- 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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