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Analog Devices Inc./Maxim Integrated MAX709LCUA
- Part No.:
- MAX709LCUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX709LCUA.pdf
- Description:
- IC SUPERVISOR PWR SUP MON RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,804
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Product details
Overview
MAX709LCUA 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 VCC = 1V. It delivers reliable µP supervision during power-up, brownout, and power-down in embedded controllers, industrial PLCs, and telecom line cards.
For engineers reviewing the MAX709LCUA datasheet, MAX709LCUA pinout, MAX709LCUA application, or MAX709LCUA equivalent, key selection criteria include reset threshold tolerance (±150mV), temperature-stable delay (140–560ms), immunity to sub-40µs negative VCC transients, and compatibility with 8-pin µMAX packaging for space-constrained designs.
Technical Context
The MAX709LCUA integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET driver. Its reset logic asserts low when VCC drops below 4.50V (min) and holds for ≥140ms after VCC rises above 4.75V (max), ensuring deterministic µP initialization.
It operates across 1.0V–5.5V supply range with supply current of 65µA (typ) at +5V and −40°C to +85°C temperature range. The device guarantees valid RESET state down to VCC = 1V and exhibits <0.3% normalized threshold drift over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V nominal (4.50V min / 4.75V max); ensures reliable detection of +5V rail collapse before µP malfunction. |
| Power-On Reset Delay | 140ms minimum; guarantees µP remains held in reset long enough for oscillator stabilization and memory initialization. |
| Supply Voltage Range | 1.0V to 5.5V; enables valid RESET assertion even during deep brownout, supporting fail-safe shutdown sequencing. |
| Supply Current | 65µA typical at +5V; minimizes standby power impact in battery-backed or energy-sensitive systems. |
| RESET Output Type | Open-drain, 20mA sink capability; allows wired-OR configuration and flexible pull-up voltage selection (e.g., 3.3V or 5V). |
| Operating Temperature | −40°C to +85°C; qualified for industrial environments including factory automation and outdoor telecom equipment. |
| Transient Immunity | Immune to negative VCC glitches ≤40µs at 100mV overdrive; eliminates false resets from switching noise or ESD coupling. |
Pinout & Package
MAX709LCUA is housed in an 8-pin µMAX package (3.05mm × 3.05mm, 0.5mm pitch), compatible with high-density PCB layouts and reflow soldering. Pin 1 is top-left corner (notch-marked), with pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | No internal connection; must be left floating or tied to GND per layout best practice-no routing required. |
| 2 | VCC | Main supply input; requires 0.1µF ceramic bypass capacitor placed adjacent to pin for transient suppression. |
| 3 | GND | Analog ground reference; must connect to system ground plane with low-inductance path to minimize noise coupling. |
| 4 | No Connect | No internal connection; electrically isolated-no trace routing needed. |
| 5 | No Connect | No internal connection; unused pin-leave unconnected. |
| 6 | No Connect | No internal connection; no function or internal tie-omit from netlist. |
| 7 | RESET | Active-low open-drain reset output; sinks current to hold µP in reset; requires external pull-up resistor (typically 10kΩ). |
| 8 | No Connect | No internal connection; no electrical role-no PCB footprint connection required. |
Key Features
| Feature | Design Value |
|---|---|
| +5V System Optimization | 4.65V reset threshold precisely matches TTL/CMOS µP VCC tolerance bands for robust power-fail detection. |
| No External Timing Components | Internal RC timer eliminates need for external capacitor/resistor, reducing BOM count and board area by ≥2 components. |
| Low-VCC Reset Validity | Guaranteed RESET assertion down to VCC = 1V ensures µP remains held until full power collapse-critical for data retention. |
| Glitch-Immune Comparator | Rejects sub-40µs negative VCC transients up to 100mV below threshold, preventing spurious resets in noisy industrial environments. |
| µMAX Package Footprint | 3.05mm × 3.05mm body with 0.5mm pitch enables placement in tight spaces where SO-8 or DIP-8 are impractical. |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Power sequencing in modular I/O backplanes where main +5V rail may sag during hot-swap insertion or load surges. IC Role / Device Role / Timing Role: Power-supply monitor asserting active-low RESET to ARM Cortex-M7 host processor until rail stabilizes post-insertion. Use Value: Prevents firmware crash during partial power-up by enforcing 140ms minimum reset hold time, independent of upstream DC/DC response. |
Use Scenario: Supervision of dual-voltage (5V/3.3V) DSP subsystems in carrier-grade access equipment exposed to lightning-induced transients. IC Role / Device Role / Timing Role: Primary reset generator for TI C66x DSP core, interfaced via 4.7kΩ series resistor to accommodate bidirectional reset pin behavior. Use Value: Immunity to 30µs VCC glitches eliminates false resets during surge events, maintaining call continuity without service interruption. |
| Medical Diagnostic Module | Automotive Body Control Unit |
Use Scenario: Battery-backed data logger in portable ultrasound units where VCC may dip during Li-ion cell transition between charge/discharge states. IC Role / Device Role / Timing Role: Brownout detector holding reset on ADSP-BF533 until stable +5V is restored from buck converter output. Use Value: Valid RESET down to VCC = 1V prevents corrupted EEPROM writes during marginal battery conditions. |
Use Scenario: Reset management for Infineon AURIX TC275 microcontroller in door module ECUs subjected to load-dump pulses and cold-crank profiles. IC Role / Device Role / Timing Role: Standalone supervisor providing clean reset pulse after VCC recovers from 6V cold-crank event. Use Value: 4.65V threshold aligns with automotive 5V LDO spec, ensuring reset triggers only when rail falls outside functional operating range. |
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 rated for −40°C to +85°C (E-grade) and offered in SO-8 only. | SO-8 footprint requires PCB redesign; lacks µMAX option for ultra-compact layouts. | Select MAX706P only if extended temperature range is mandatory and µMAX size is not required. |
| MAX813L | Identical 4.65V threshold and 140ms delay, but includes manual reset input (MR) and watchdog timer-features absent in MAX709LCUA. | MR and WDI pins add functionality but increase pin count and require additional board routing. | Choose MAX813L when system-level watchdog supervision or pushbutton-initiated reset is needed alongside power monitoring. |
Compared with MAX706P and MAX813L, the MAX709LCUA provides identical core reset functionality in the smallest possible footprint (µMAX), with no extra features or temperature grade overhead-ideal for cost- and space-sensitive +5V systems where only basic power-fail detection is required.
Availability
MAX709LCUA is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, and medical diagnostic modules requiring stable component supply, long-term lifecycle support, and consistent µMAX packaging.
Supply support for MAX709LCUA 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 low-cost, minimal-component µP reset supervision in +3V/+3.3V/+5V systems-emphasizing accuracy, glitch immunity, and small-footprint packaging without added complexity.
FAQ
What is the exact reset threshold voltage of the MAX709LCUA?
The MAX709LCUA has a nominal reset threshold of 4.65V, with guaranteed limits of 4.50V (minimum) and 4.75V (maximum) across the full −40°C to +85°C operating range. This threshold is factory-trimmed and does not require external calibration or adjustment, making it suitable for precise +5V rail monitoring in mission-critical applications where voltage margin is tightly constrained.
Does the MAX709LCUA provide a manual reset input?
No, the MAX709LCUA does not include a manual reset (MR) input. It is a dedicated power-supply monitor with automatic reset generation only-triggered solely by VCC crossing the 4.65V threshold. If manual reset capability is required, consider alternatives such as MAX813L or MAX706P with MR pin, but note these require different pinouts and may not fit the same µMAX footprint as the MAX709LCUA.
Can the MAX709LCUA operate reliably with VCC below 2.0V?
Yes-the MAX709LCUA guarantees correct RESET output state down to VCC = 1.0V. Below this level, the RESET output becomes high-impedance (open-circuit), but the device continues to monitor VCC and will reassert RESET low once VCC rises above 4.50V. This behavior supports safe shutdown sequencing in systems with backup batteries or multi-rail power architectures where primary rails collapse asymmetrically.
What is the recommended bypass capacitor for the MAX709LCUA VCC pin?
A 0.1µF ceramic capacitor placed as close as possible to pin 2 (VCC) is explicitly recommended in the MAX709LCUA datasheet to suppress high-frequency transients and improve immunity to sub-40µs negative VCC glitches. This capacitor must be X7R or better dielectric, mounted with short traces and direct connection to the GND plane-failure to implement it may degrade the specified transient immunity performance.
Is the MAX709LCUA pin-compatible with other MAX709 variants like MAX709M or MAX709R?
Yes-all MAX709 variants (including MAX709LCUA, MAX709MUA, MAX709RUA) share identical 8-pin µMAX pinout and package dimensions. The only difference is the factory-set reset threshold voltage (4.65V for L, 4.40V for M, 2.63V for R). No PCB layout change is needed when substituting between them, provided the target system's supply voltage and reset margin requirements align with the selected threshold.
MAX709LCUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX709LCUA FAQ
1.How can I place an order for MAX709LCUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709LCUA 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 MAX709LCUA reliable?
The price and inventory of MAX709LCUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709LCUA is usually 5 days.
3.What payment methods are accepted for MAX709LCUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709LCUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709LCUA?
MAX709LCUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709LCUA 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 MAX709LCUA?
For technical support, including MAX709LCUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709LCUA requirements.
6.How does Aetrix verify that MAX709LCUA is sourced from the original manufacturer or authorized distributors?
All MAX709LCUA 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 MAX709LCUA meets industry standards.
7.What is the process for return or replacement of MAX709LCUA?
All MAX709LCUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX709LCUA, 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 MAX709LCUA part is unused and in its original packaging.
Return procedure for MAX709LCUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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