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Analog Devices Inc./Maxim Integrated MAX709LESA+
- Part No.:
- MAX709LESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709LESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,192
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Product details
Overview
MAX709LESA+ 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 eliminates external components in microprocessor supervisory circuits and supports SO-8 packaging for space-constrained embedded designs.
For engineers reviewing the MAX709LESA+ datasheet, MAX709LESA+ pinout, MAX709LESA+ application, or MAX709LESA+ equivalent, this page delivers verified electrical parameters, thermal behavior across -40°C to +85°C, package dimensions, and validated alternatives for industrial control, automotive body electronics, and medical instrumentation where reliable power-on reset timing and brownout immunity are critical.
Technical Context
The MAX709LESA+ integrates a precision voltage comparator with hysteresis and an internal timer to generate a guaranteed minimum 140ms active-low RESET pulse after VCC rises above 4.65V (±150mV). Its reset assertion remains valid down to VCC = 1V, ensuring deterministic µP reset state during deep undervoltage conditions.
It features immunity to short negative VCC transients - e.g., a 100mV overdrive glitch lasting ≤40µs does not trigger spurious reset - and draws only 65µA typical supply current at VCC = 5.5V, enabling low-power system monitoring without burdening the supply rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V ±150mV - ensures reliable detection of +5V supply collapse before µP enters undefined state |
| Reset Timeout | 140ms min - guarantees sufficient hold time for full µP initialization after power-up |
| VCC Operating Range | 1.0V to 5.5V - enables functional reset assertion even during severe brownout down to 1V |
| Supply Current | 65µA typ at 5.5V - minimizes quiescent load on battery-backed or energy-harvested supplies |
| Output Drive | Sinks 1.2mA at VTH min - directly interfaces with TTL/CMOS µP reset inputs without external pull-up |
| Package | 8-pin SO (SOIC) - industry-standard footprint compatible with automated PCB assembly |
| Temp Range | -40°C to +85°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
MAX709LESA+ uses an 8-pin SO (SOIC) package with 1.27mm pitch, 5.0mm × 4.0mm body size, and gull-wing leads. Pin 1 is top-left corner (marking dot), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect | Internally unconnected - must be left floating or tied to GND per layout best practice |
| 2 | VCC | Main supply input - accepts 1.0V–5.5V; requires 0.1µF bypass capacitor adjacent to pin |
| 3 | GND | Analog/digital ground reference - must connect to system ground plane with low-inductance path |
| 7 | RESET | Active-low open-drain reset output - sinks current to hold µP in reset; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65V threshold | Guaranteed ±150mV tolerance ensures consistent reset activation across temperature and unit-to-unit variation |
| 140ms power-on delay | Internally timed minimum duration prevents premature µP release before clock stabilization and memory initialization |
| 1V minimum VCC operation | RESET remains asserted and electrically valid down to 1V supply, eliminating need for auxiliary reset circuitry |
| Transient immunity | Rejects ≤40µs negative VCC glitches up to 100mV below threshold - suppresses noise-induced false resets |
| No external components | Self-contained reset generation eliminates resistors, capacitors, and comparators required in discrete solutions |
Applications
| Industrial PLC Controllers | Automotive Body Control Modules |
|---|---|
Use Scenario: Monitoring 5V microcontroller supply in programmable logic controllers exposed to wide ambient temperature swings and EMI-rich factory floors. IC Role / Device Role / Timing Role: Power-supply monitor providing deterministic reset assertion during line sags, hot-swap events, and cold-start sequencing. Use Value: Eliminates risk of firmware corruption by guaranteeing ≥140ms reset hold time after VCC recovery, even at -40°C. | Use Scenario: Supervising 5V domain powering door-lock MCU, window lift drivers, and interior lighting in vehicle cabin modules. IC Role / Device Role / Timing Role: Brownout detector that asserts RESET during battery voltage dip below 4.65V during engine cranking. Use Value: Prevents erratic actuator behavior by holding µP in reset until stable 5V rail is restored post-cranking. |
| Medical Diagnostic Handhelds | Point-of-Sale Terminal Power Management |
Use Scenario: Ensuring safe boot sequence in portable ultrasound or glucose meter devices powered by Li-ion batteries with aging voltage profiles. IC Role / Device Role / Timing Role: Low-voltage supervisor validating VCC ≥4.65V before enabling ADC, display driver, and wireless interface. Use Value: Avoids sensor data corruption and RF transmission errors caused by marginal supply voltage during battery discharge. | Use Scenario: Managing power-on reset for ARM-based POS terminals using 5V wall adapters subject to intermittent AC dropout. IC Role / Device Role / Timing Role: System reset generator that initiates clean reboot when adapter output drops below 4.65V for >100ms. Use Value: Maintains transaction integrity by preventing partial firmware execution during unstable AC input conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706PEPA+ | Same 4.65V threshold, but DIP-8 package and 0°C to +70°C temp range | Limited to commercial-temperature industrial enclosures; no under-hood or outdoor deployment | Select when through-hole assembly or legacy board compatibility is required |
| MAX708TESA+ | 3.08V reset threshold, same SO-8 package and -40°C to +85°C rating | Designed for 3.3V systems; incompatible with 5V µP reset logic levels without level-shifting | Choose only if migrating to lower-voltage supply architecture with matching threshold requirement |
Compared with MAX709LESA+, MAX706PEPA+ offers identical reset functionality but lacks extended temperature support, while MAX708TESA+ shifts threshold to 3.08V - making it unsuitable for +5V systems without redesign. MAX709LESA+ remains optimal for new 5V industrial designs needing robustness across full industrial temperature range.
Availability
MAX709LESA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical diagnostic handhelds requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant lead-free packaging.
Supply support for MAX709LESA+ 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) designs precision analog, mixed-signal, and power management ICs for high-reliability applications in industrial, automotive, and medical markets.
The MAX709 family targets microprocessor supervisory functions - delivering integrated reset generation, brownout protection, and transient immunity for embedded systems where supply stability is mission-critical.
FAQ
What is the exact reset threshold voltage for MAX709LESA+?
The MAX709LESA+ has a nominal reset threshold voltage of 4.65V, with guaranteed limits of 4.50V (minimum) and 4.75V (maximum) across the full -40°C to +85°C operating temperature range. This threshold is factory-trimmed and does not require external calibration or resistor networks, ensuring consistent performance in +5V system supervision.
Does MAX709LESA+ require an external pull-up resistor on the RESET pin?
Yes, MAX709LESA+ features an open-drain RESET output and requires an external pull-up resistor to VCC (typically 10kΩ) to establish a valid logic-high state when reset is inactive. Without this resistor, the RESET line floats and cannot drive CMOS or TTL inputs reliably. The pull-up value balances speed and power consumption - values between 4.7kΩ and 100kΩ are commonly used.
Can MAX709LESA+ operate with a 3.3V supply?
No, MAX709LESA+ is specified for 4.65V reset threshold and intended for +5V systems. While its VCC range extends down to 1.0V, the 4.65V threshold is too high for reliable 3.3V supervision - it would assert reset continuously. For 3.3V systems, use MAX709TESA+ (3.08V threshold) or MAX706TESA+ instead.
What is the maximum allowable negative VCC transient duration for MAX709LESA+?
At 100mV overdrive (i.e., VCC dropping 100mV below the 4.65V threshold), MAX709LESA+ tolerates negative transients up to 40µs without issuing a false reset pulse. This immunity is confirmed in the Typical Operating Characteristics graph (Figure 1) and applies across -40°C to +85°C. Shorter durations are tolerated at larger overdrive magnitudes.
Is MAX709LESA+ pin-compatible with other MAX709 variants like MAX709MESA+?
Yes, all MAX709 variants including MAX709LESA+, MAX709MESA+, and MAX709TESA+ share identical SO-8 pinout, terminal functions, and package dimensions. Only the reset threshold voltage differs (L=4.65V, M=4.40V, T=3.08V); all other electrical and timing characteristics - including 140ms reset timeout and 65µA supply current - remain consistent across the family.
MAX709LESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX709LESA+ FAQ
1.How can I place an order for MAX709LESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709LESA+ 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 MAX709LESA+ reliable?
The price and inventory of MAX709LESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709LESA+ is usually 5 days.
3.What payment methods are accepted for MAX709LESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709LESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709LESA+?
MAX709LESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709LESA+ 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 MAX709LESA+?
For technical support, including MAX709LESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709LESA+ requirements.
6.How does Aetrix verify that MAX709LESA+ is sourced from the original manufacturer or authorized distributors?
All MAX709LESA+ 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 MAX709LESA+ meets industry standards.
7.What is the process for return or replacement of MAX709LESA+?
All MAX709LESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709LESA+, 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 MAX709LESA+ part is unused and in its original packaging.
Return procedure for MAX709LESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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