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Analog Devices Inc./Maxim Integrated MAX709TEPA
- Part No.:
- MAX709TEPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX709TEPA.pdf
- Description:
- IC SUPERVISOR PWR SUP MON RESET
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
MAX709TEPA 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 3.08V nominal reset threshold, 140ms minimum reset timeout, guaranteed operation down to VCC = 1V, and low 35µA supply current. It is used in embedded microcontroller systems where deterministic reset timing and immunity to short VCC transients are critical.
For engineers reviewing the MAX709TEPA datasheet, MAX709TEPA pinout, MAX709TEPA application, or MAX709TEPA equivalent, this page delivers verified electrical parameters, package mapping to 8-pin plastic DIP, thermal and timing behavior across temperature, and real-world interface guidance for µP reset lines and transient immunity.
Technical Context
The MAX709TEPA integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET output driver. Its reset assertion is triggered when VCC drops below 3.08V ±2.3% (typical), and the reset pulse remains active for ≥140ms after VCC rises above threshold.
It operates over -40°C to +85°C, supports VCC from 1.0V to 5.5V, and maintains valid RESET state down to 1V supply-enabling robust supervision in low-voltage microcontroller applications without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2.3% (typical); ensures reliable detection of brownout in +3V systems |
| Power-On Reset Delay | 140ms min; guarantees µP initialization completes before release from reset |
| Supply Current | 35µA (typ) at VCC = 3.6V; enables ultra-low-power system supervision |
| VCC Operating Range | 1.0V to 5.5V; supports operation during deep brownout and compatibility with +3V/+3.3V/+5V rails |
| RESET Output Type | Active-low open-drain; allows wired-OR configuration and level-shifting with external pull-up |
| Transient Immunity | Immune to negative VCC glitches ≤40µs at 100mV overdrive; reduces false resets in noisy environments |
| Temperature Range | -40°C to +85°C; qualified for industrial-grade embedded applications |
Pinout & Package
MAX709TEPA is housed in an 8-pin plastic DIP (Dual In-line Package) with 0.300" body width and through-hole mounting. Pin 1 is top-left corner (notch side), with pins numbered counter-clockwise.
| 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 |
| 2 | VCC | Positive supply input; accepts 1.0V–5.5V; requires local 0.1µF bypass capacitor |
| 3 | GND | Analog ground reference; must be connected to system ground plane with low-inductance path |
| 7 | RESET | Active-low open-drain reset output; sinks ≥1.2mA at VCC = threshold min; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated timing capacitor and comparator eliminate need for RC networks or trim pots |
| +3V system optimization | 3.08V reset threshold matches typical +3V rail tolerance and brownout margin |
| Valid RESET down to VCC = 1V | Ensures deterministic reset assertion even during severe undervoltage conditions |
| 140ms minimum reset timeout | Guarantees sufficient hold time for slow-starting µPs and peripheral initialization |
| Immunity to short VCC transients | Rejects <40µs negative glitches up to 100mV below threshold-no false resets in EMI-prone environments |
Applications
| Industrial PLC Controller | Medical Sensor Node |
|---|---|
Use Scenario: Compact, battery-backed sensor node operating on regulated +3V supply with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Power-supply monitor that asserts RESET during brownout or cold start, holding µC in reset until stable +3V is confirmed. Use Value: Prevents firmware corruption by ensuring µC only exits reset after VCC exceeds 3.08V and remains stable for ≥140ms. |
Use Scenario: Low-power wearable vital-sign monitor using a +3V LDO and ARM Cortex-M0+ MCU. IC Role / Device Role / Timing Role: Supervisory IC providing fail-safe reset during battery voltage sag or LDO dropout. Use Value: Guarantees clean boot sequence even as battery decays to 3.1V, leveraging 3.08V threshold and 1V operational floor. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Under-hood BCM powered from vehicle's +3.3V rail subject to load-dump and cranking transients. IC Role / Device Role / Timing Role: Brownout detector immune to sub-50µs negative VCC spikes during alternator switching. Use Value: Eliminates spurious resets during engine cranking, improving system reliability without added filtering. |
Use Scenario: DIN-rail mounted meter with isolated +3V logic rail and EEPROM data logging. IC Role / Device Role / Timing Role: Supervisor ensuring µC remains in reset during AC line interruption or backup capacitor discharge. Use Value: Synchronizes reset release with full rail recovery, preventing partial writes to flash/EEPROM during power collapse. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RPA | Same 2.63V reset threshold, identical 140ms timeout, but rated for 0°C to +70°C only | Limited to commercial-temperature applications; not suitable for industrial or automotive ambient | Select MAX706RPA only if operating temperature stays within 0°C–70°C and 2.63V threshold suffices |
| MAX708TEPA | Same 3.08V threshold and -40°C to +85°C rating, but adds manual reset input (MR) and watchdog timer disable (WDI) | Enables system-initiated reset and watchdog control-required for complex µP supervision beyond basic power monitoring | Choose MAX708TEPA when manual reset assertion or watchdog functionality is needed; otherwise MAX709TEPA offers lower cost and simpler BOM |
Compared with MAX706RPA, MAX709TEPA provides extended temperature range and higher reset threshold for +3V systems; compared with MAX708TEPA, it omits MR and WDI pins-reducing pin count and cost where those functions are unnecessary.
Availability
MAX709TEPA 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 lifecycle support.
Supply support for MAX709TEPA 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, automotive, and communications applications.
The MAX709 belongs to Maxim's µP supervisory circuit family, engineered to replace discrete reset solutions with integrated, temperature-stable, low-power monitoring for microprocessor-based systems.
FAQ
What is the exact reset threshold voltage of the MAX709TEPA?
The MAX709TEPA has a nominal reset threshold of 3.08V, with a guaranteed range of 3.00V to 3.15V over the full -40°C to +85°C temperature range. This value is factory-trimmed and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix 'T'. The threshold remains stable across temperature, with normalized variation ≤±0.5% over -40°C to +85°C.
Does the MAX709TEPA require external components to function?
No, the MAX709TEPA requires no external components for basic reset functionality. It integrates the voltage reference, comparator, and timing capacitor internally. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for noise immunity, but is not mandatory for core operation. No pull-up resistor is included-external pull-up is required on RESET (pin 7) to establish high state.
Can the MAX709TEPA operate with a supply voltage below 3V?
Yes, the MAX709TEPA operates with VCC as low as 1.0V and guarantees correct RESET output state down to 1V. Below 1V, RESET becomes high-impedance (open-circuit), so a pull-down resistor is recommended if valid logic state is required down to 0V. Its 3.08V threshold makes it ideal for +3V systems, but its wide 1.0V–5.5V supply range supports use in brownout recovery and multi-rail supervision.
What is the purpose of the N.C. pins on the MAX709TEPA?
Pins 1, 4, 5, 6, and 8 of the MAX709TEPA are No Connect (N.C.)-they have no internal connection and must remain unconnected. These pins exist for package compatibility across the MAX70x family and do not affect operation. They may be left floating or tied to GND for mechanical stability, but must never be connected to VCC or signal lines.
How does the MAX709TEPA handle fast VCC transients?
The MAX709TEPA is specifically designed to ignore short negative-going VCC transients: for example, a 100mV dip below threshold is tolerated if ≤40µs duration (typical). This immunity prevents false resets during switching noise or load transients. Layout best practice-placing a 0.1µF capacitor close to pin 2 (VCC)-further enhances robustness against such events.
MAX709TEPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX709TEPA FAQ
1.How can I place an order for MAX709TEPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709TEPA 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 MAX709TEPA reliable?
The price and inventory of MAX709TEPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709TEPA is usually 5 days.
3.What payment methods are accepted for MAX709TEPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709TEPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709TEPA?
MAX709TEPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709TEPA 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 MAX709TEPA?
For technical support, including MAX709TEPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709TEPA requirements.
6.How does Aetrix verify that MAX709TEPA is sourced from the original manufacturer or authorized distributors?
All MAX709TEPA 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 MAX709TEPA meets industry standards.
7.What is the process for return or replacement of MAX709TEPA?
All MAX709TEPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX709TEPA, 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 MAX709TEPA part is unused and in its original packaging.
Return procedure for MAX709TEPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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