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Analog Devices Inc./Maxim Integrated MAX709SESA
- Part No.:
- MAX709SESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709SESA.pdf
- Description:
- IC SUPERVISOR PWR SUP MON RESET
- Quantity:
- Payment:
- Shipping:
Inventory:4,536
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Product details
Overview
MAX709SESA from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +3V systems requiring reliable brownout and power-up supervision. It features a 2.93V nominal reset threshold, 140ms minimum reset timeout, guaranteed operation down to VCC = 1V, and low 35µA supply current. It is used in embedded microprocessor systems where deterministic reset timing and immunity to short VCC transients are critical.
For engineers reviewing the MAX709SESA datasheet, MAX709SESA pinout, MAX709SESA application, or MAX709SESA equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), SO-8 package compatibility, -40°C to +85°C industrial temperature range, and absence of external components for reset timing.
Technical Context
The MAX709SESA implements a precision bandgap-based voltage comparator with hysteresis to detect VCC falling below its 2.93V threshold. Its internal timer generates a fixed 140ms (min) active-low RESET pulse after VCC rises above threshold, independent of VCC slew rate.
It operates across 1.0V–5.5V VCC, sinks up to 1.2mA at RESET during active state, and maintains valid logic levels down to VCC = 1V. The device is immune to negative VCC transients ≤40µs when overdrive is ≤100mV, per characterization data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal, ±1.5% over -40°C to +85°C - ensures accurate detection of 3V rail collapse |
| Reset Timeout | 140ms minimum - guarantees µP remains held in reset long enough for stable clock and supply settling |
| Supply Current | 35µA typical at 3.6V - enables use in battery-backed or low-power always-on monitoring |
| VCC Operating Range | 1.0V to 5.5V - supports operation during deep brownout and compatibility with 3.3V/5V systems |
| RESET Output Drive | Sinks 1.2mA at VCC = threshold min - sufficient to directly drive CMOS reset inputs without pull-up loading |
| Temperature Range | -40°C to +85°C - qualified for industrial and extended-temperature embedded applications |
Pinout & Package
MAX709SESA is supplied in an 8-pin SO (Small Outline) package, 150mil width, JEDEC MS-012AC compliant, with gull-wing leads and standard SO footprint.
| 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 | Positive supply input; accepts 1.0V–5.5V; requires local 0.1µF bypass capacitor |
| 3 | GND | Analog and digital ground reference; must be connected to system ground plane |
| 7 | RESET | Active-low open-drain reset output; sinks current during fault; requires external pull-up for logic-high state |
Key Features
| Feature | Design Value |
|---|---|
| Precision Reset Threshold | 2.93V ±1.5% over full temperature range - eliminates need for external resistor divider calibration |
| Fixed Power-On Reset Delay | 140ms minimum - meets Intel and ARM µP reset timing requirements without external RC network |
| Low Supply Current | 35µA typical - reduces standby power in always-on supervisory circuits |
| VCC Transient Immunity | Rejects ≤40µs negative glitches ≥100mV below threshold - improves robustness in noisy power environments |
| Guaranteed Operation Down to 1V | RESET remains valid until VCC drops to 1V - enables early fault detection before µP loses functionality |
Applications
| Industrial PLC Controller | Medical Sensor Node |
|---|---|
Use Scenario: Microcontroller-based programmable logic controller operating on 3.3V rail in factory-floor environment with variable line quality and EMI. IC Role / Device Role / Timing Role: Power-supply monitor providing brownout reset and power-up sequencing signal to ARM Cortex-M4 core. Use Value: Prevents erratic firmware execution during undervoltage events; 2.93V threshold matches 3.3V LDO dropout margin; 140ms delay exceeds µP oscillator stabilization time. | Use Scenario: Battery-powered wearable vital-sign sensor with ultra-low-power sleep mode and infrequent wake-ups. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during battery voltage sag below safe operating level. Use Value: 35µA quiescent current minimizes battery drain; 2.93V threshold aligns with Li-ion cell end-of-discharge voltage; SO-8 package enables compact PCB layout. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: CAN-connected BCM powered from vehicle 12V-to-3.3V DC/DC converter subject to load-dump transients. IC Role / Device Role / Timing Role: Voltage supervisor detecting 3.3V rail collapse and initiating controlled µC shutdown sequence. Use Value: Immunity to ≤40µs VCC glitches prevents spurious resets during switching noise; -40°C to +85°C rating satisfies automotive ambient requirements. | Use Scenario: Revenue-grade electricity meter with tamper detection, real-time clock, and isolated communication interface. IC Role / Device Role / Timing Role: Primary reset source ensuring secure boot integrity after AC power interruption or brownout. Use Value: 140ms reset hold time exceeds RTC crystal startup and flash memory initialization delays; SO-8 package supports automated assembly and reflow compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SESA | Same 2.93V threshold and SO-8 package; includes manual reset input (MR) pin | Supports operator-initiated reset via pushbutton; adds one external component (pull-up/pull-down) | Select MAX706SESA if system requires field-serviceable reset capability beyond automatic power supervision |
| TPS3808G30DBVR | 2.93V threshold, 200ms reset timeout, 1.8µA IQ, SOT-23-6 package | Lower power and smaller footprint but lacks transient immunity spec and SO-8 compatibility | Select TPS3808G30DBVR only if board space and ultra-low IQ are prioritized over proven industrial glitch rejection and SO-8 drop-in replacement |
Compared with MAX709SESA, MAX706SESA adds manual reset functionality at identical threshold and package, while TPS3808G30DBVR trades SO-8 compatibility and transient immunity for ultra-low quiescent current and smaller size-making MAX709SESA optimal for cost-sensitive, industrial SO-8 designs requiring proven robustness.
Availability
MAX709SESA is available at Aetrix Electronics and suitable for industrial PLC controllers, medical sensor nodes, automotive body control modules, and smart energy meters requiring stable component supply and long-term manufacturability.
Supply support for MAX709SESA 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 applications.
The MAX709 family was designed specifically for cost-sensitive, minimal-component µP reset supervision in 3V/3.3V/5V systems-emphasizing precision threshold stability, fixed timing, and SO/DIP/µMAX package flexibility.
FAQ
What is the exact reset threshold voltage of the MAX709SESA?
The MAX709SESA has a nominal reset threshold voltage of 2.93V, with a guaranteed tolerance of ±1.5% over the full -40°C to +85°C operating temperature range. This value is laser-trimmed at wafer test and does not require external calibration. The 'S' suffix in MAX709SESA explicitly denotes the 2.93V version, as confirmed in Maxim's ordering guide and electrical characteristics table.
Does the MAX709SESA require any external components to function?
No, the MAX709SESA requires no external resistors, capacitors, or timing components to perform its core reset supervision function. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for noise immunity but is not strictly required for basic operation. The 140ms reset timeout is generated internally and does not rely on external RC networks.
What is the operating temperature range for the MAX709SESA?
The MAX709SESA is rated for operation from -40°C to +85°C, as indicated by the 'E' prefix in the part number (MAX709ESA). This industrial temperature grade is validated per Maxim's qualification standards and applies to all electrical specifications in the datasheet unless otherwise noted.
Can the MAX709SESA drive a microprocessor reset pin directly?
Yes, the MAX709SESA RESET output (pin 7) is an active-low open-drain driver capable of sinking up to 1.2mA at VCC = reset threshold minimum. It can directly drive most CMOS µP reset inputs when paired with a standard 10kΩ pull-up resistor to VCC. No buffer or level-shifter is needed for standard 3.3V or 5V microcontrollers.
Is the MAX709SESA pin-compatible with other MAX709 variants like MAX709LESA?
Yes, all MAX709 variants-including MAX709SESA, MAX709LESA, and MAX709RESE-are fully pin-compatible in the same package type (e.g., SO-8). They share identical pinout, package dimensions, and electrical interface; only the reset threshold voltage differs between suffixes (L=4.65V, M=4.40V, S=2.93V, R=2.63V, T=3.08V).
MAX709SESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX709SESA FAQ
1.How can I place an order for MAX709SESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709SESA 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 MAX709SESA reliable?
The price and inventory of MAX709SESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709SESA is usually 5 days.
3.What payment methods are accepted for MAX709SESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709SESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709SESA?
MAX709SESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709SESA 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 MAX709SESA?
For technical support, including MAX709SESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709SESA requirements.
6.How does Aetrix verify that MAX709SESA is sourced from the original manufacturer or authorized distributors?
All MAX709SESA 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 MAX709SESA meets industry standards.
7.What is the process for return or replacement of MAX709SESA?
All MAX709SESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX709SESA, 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 MAX709SESA part is unused and in its original packaging.
Return procedure for MAX709SESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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