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Analog Devices Inc./Maxim Integrated MAX709MESA+
- Part No.:
- MAX709MESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709MESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:157
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Product details
Overview
MAX709MESA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +3.3V and +5V systems. It asserts RESET when VCC falls below 4.40V (±2.5%), holds reset for ≥140ms after VCC recovers, operates down to VCC = 1V, and draws only 65µA typical supply current. It is used in microprocessor-based embedded systems requiring reliable power-on and brownout reset.
For engineers reviewing the MAX709MESA+ datasheet, MAX709MESA+ pinout, MAX709MESA+ application, or MAX709MESA+ equivalent, key selection criteria include reset threshold accuracy (4.40V), guaranteed minimum reset timeout (140ms), low quiescent current (65µA), immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with 8-pin SO package layouts.
Technical Context
The MAX709MESA+ integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET driver. Its reset threshold is factory-trimmed to 4.40V ±2.5% and remains stable across -40°C to +85°C with <0.01%/°C drift.
It features a fixed 140ms minimum reset timeout after VCC rises above threshold, no external components required, and robust operation under fast VCC slew rates (up to 100V/µs) and negative transients - critical for noisy industrial and automotive power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±2.5% - ensures reliable detection of +3.3V or +5V supply brownout before µP malfunction. |
| Reset Timeout | ≥140ms - guarantees sufficient hold time for µP initialization after power recovery. |
| Supply Current | 65µA (typ) - enables low-power operation without compromising reset reliability. |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET state down to 1V, enabling early-fail detection. |
| RESET Output Type | Open-drain, sink capable of 20mA - allows flexible pull-up voltage selection and wired-OR configuration. |
| Temperature Range | -40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
| Package | 8-pin SO (SOIC) - surface-mount compatible with standard PCB assembly processes. |
Pinout & Package
MAX709MESA+ is housed in an 8-pin SO (SOIC) package, 150mil width, with gull-wing leads and RoHS-compliant lead-free finish (+ suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect (N.C.) | Internally unconnected - must be left floating or tied to GND per layout best practice; no electrical function. |
| 2 | VCC | Main supply input - powers internal circuitry and defines reset threshold reference; accepts 1.0V–5.5V. |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane for accurate threshold sensing. |
| 7 | RESET | Active-low open-drain reset output - sinks current during fault; requires external pull-up to define logic-high level. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V reset threshold | Factory-trimmed ±2.5% tolerance ensures consistent brownout detection across temperature and voltage rails. |
| 140ms minimum reset timeout | Guaranteed delay prevents premature µP release during unstable power recovery. |
| No external components required | Eliminates discrete resistors, capacitors, and trimming - reduces BOM count and board area. |
| Immunity to short VCC transients | Withstands ≤40µs negative glitches up to 100mV below threshold - avoids spurious resets in noisy environments. |
| Valid RESET down to VCC = 1V | Ensures deterministic reset assertion even during deep undervoltage conditions before full power collapse. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
|
Use Scenario: Power sequencing and brownout monitoring in programmable logic controllers operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: System-level reset supervisor ensuring µP remains held until stable +5V and +3.3V rails are confirmed. Use Value: Prevents firmware corruption during line sags by asserting RESET for ≥140ms after VCC recovers above 4.40V. |
Use Scenario: Critical power monitoring in portable ultrasound or patient monitor units with battery-backed operation. IC Role / Device Role / Timing Role: Primary reset generator interfaced to ARM Cortex-M4 µP with bidirectional reset pin. Use Value: Open-drain RESET output enables safe wired-OR with backup battery supervisor; 65µA supply current extends battery life. |
| Automotive Body Control Module | Network Edge Router |
|
Use Scenario: Reset management in 12V-to-5V/3.3V converted subsystems exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Immune power-supply monitor detecting VCC dips below 4.40V during engine cranking. Use Value: Tolerates ≤40µs negative VCC transients without false triggering - maintains system stability during ignition events. |
Use Scenario: High-reliability reset supervision in fanless enterprise routers with thermally constrained PCBs. IC Role / Device Role / Timing Role: Single-chip reset solution replacing discrete RC networks on +3.3V core rail. Use Value: Reduces component count by 4 parts and eliminates manual calibration - improves manufacturing yield and long-term drift stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706MESA+ | Identical 4.40V threshold and 140ms timeout, but adds watchdog timer and manual reset input. | Required where µP firmware hang detection or user-initiated reset is needed. | Select MAX706MESA+ only if watchdog functionality is mandatory; otherwise MAX709MESA+ offers lower cost and simpler layout. |
| TPS3808G33DBVR | 3.3V fixed threshold (±0.5%), 200ms timeout, 1.5µA supply current, SOT-23-6 package. | Better suited for ultra-low-power, single-rail +3.3V systems with space constraints. | Choose TPS3808G33DBVR for battery-powered designs needing sub-µA quiescent current; MAX709MESA+ preferred for dual-rail (+5V/+3.3V) industrial use. |
Compared with MAX706MESA+, MAX709MESA+ eliminates watchdog complexity and reduces cost while retaining identical reset performance; versus TPS3808G33DBVR, it supports wider VCC range (1V–5.5V) and higher noise immunity but consumes more current and occupies larger footprint.
Availability
MAX709MESA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic devices, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX709MESA+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX709 series belongs to Maxim's µP supervisory circuits product line, engineered specifically to replace discrete reset solutions in microprocessor-based systems with guaranteed timing, precision thresholds, and ruggedized transient response.
FAQ
What is the exact reset threshold voltage of the MAX709MESA+?
The MAX709MESA+ has a nominal reset threshold of 4.40V with a tolerance of ±2.5%, meaning it asserts RESET when VCC drops below 4.25V (min) and releases RESET only after VCC rises above 4.50V (max). This specification is verified across the full -40°C to +85°C operating temperature range and is factory-trimmed - no external calibration is required for the MAX709MESA+.
Does the MAX709MESA+ require external components to operate?
No, the MAX709MESA+ requires no external components for basic reset functionality. Its internal voltage reference, comparator, and timing circuitry eliminate the need for external resistors, capacitors, or trimming networks. A 0.1µF bypass capacitor on VCC (pin 2) is recommended for enhanced transient immunity, but it is not mandatory for functional operation of the MAX709MESA+.
Can the MAX709MESA+ drive a microprocessor reset pin directly?
Yes, the MAX709MESA+ can drive most µP reset pins directly via its open-drain RESET output (pin 7), provided an appropriate pull-up resistor (typically 10kΩ to VCC or another logic rail) is used. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor between MAX709MESA+ RESET and the µP pin prevents contention - this configuration is validated in Maxim's application notes for the MAX709MESA+.
What is the minimum VCC voltage at which the MAX709MESA+ guarantees correct RESET state?
The MAX709MESA+ guarantees correct RESET output state down to VCC = 1.0V. Below 1.0V, the RESET output becomes high-impedance (open-circuit) and no longer actively sinks current. This behavior is explicitly specified in the MAX709MESA+ datasheet and ensures deterministic reset assertion during deep undervoltage conditions prior to full power collapse.
Is the MAX709MESA+ pin-compatible with other MAX709 variants like MAX709LESA+?
Yes, all MAX709 variants including MAX709MESA+, MAX709LESA+, and MAX709TESA+ share identical 8-pin SO package footprints and pinouts - pins 1, 4, 5, 6, 8 are N.C., pin 2 is VCC, pin 3 is GND, and pin 7 is RESET. The only difference is the factory-set reset threshold voltage; therefore, MAX709MESA+ can be substituted for other MAX709 SO variants without PCB changes, provided the 4.40V threshold meets system requirements.
MAX709MESA+ 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:
- 4.4V
- 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
MAX709MESA+ FAQ
1.How can I place an order for MAX709MESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709MESA+ 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 MAX709MESA+ reliable?
The price and inventory of MAX709MESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709MESA+ is usually 5 days.
3.What payment methods are accepted for MAX709MESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709MESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709MESA+?
MAX709MESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709MESA+ 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 MAX709MESA+?
For technical support, including MAX709MESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709MESA+ requirements.
6.How does Aetrix verify that MAX709MESA+ is sourced from the original manufacturer or authorized distributors?
All MAX709MESA+ 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 MAX709MESA+ meets industry standards.
7.What is the process for return or replacement of MAX709MESA+?
All MAX709MESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709MESA+, 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 MAX709MESA+ part is unused and in its original packaging.
Return procedure for MAX709MESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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