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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 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,171
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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. It asserts RESET when VCC falls below 3.08V (±2%), holds reset for ≥140ms after VCC recovers, and operates down to 1V supply. Used in microprocessor-based embedded systems requiring reliable brownout detection and power-on sequencing.
For engineers reviewing the MAX709TEPA+ datasheet, MAX709TEPA+ pinout, MAX709TEPA+ application, or MAX709TEPA+ equivalent, key selection criteria include reset threshold accuracy (3.08V), guaranteed minimum reset timeout (140ms), low quiescent current (35µA), immunity to short VCC transients, and compatibility with 8-pin DIP packaging for through-hole prototyping and industrial control boards.
Technical Context
The MAX709TEPA+ integrates a precision voltage comparator, internal timing capacitor, and open-drain RESET driver - eliminating external components. Its reset threshold is factory-trimmed to 3.08V with ±2% tolerance over −40°C to +85°C, and the 140ms reset timeout is internally generated without external RC networks.
It features dual-voltage operation support: functional reset assertion down to VCC = 1V, and guaranteed RESET logic state integrity during power-down transitions. The device rejects negative VCC transients ≤40µs at 100mV overdrive, enabling robust operation in electrically noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±2% - ensures reliable reset activation for +3V systems before critical undervoltage occurs |
| Reset Timeout | ≥140ms - guarantees sufficient processor hold time after power-up or brownout recovery |
| Supply Current | 35µA typical - enables ultra-low-power operation in battery-backed or energy-constrained designs |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET output even during deep brownout down to 1V |
| Output Type | Active-low open-drain - allows wired-OR configuration and flexible pull-up voltage selection |
| Temperature Range | −40°C to +85°C - qualified for industrial and automotive under-hood applications |
| Transient Immunity | Rejects ≤40µs negative VCC glitches at 100mV overdrive - reduces false resets in noisy power rails |
Pinout & Package
MAX709TEPA+ is housed in an 8-pin plastic DIP package (0.300" wide), compatible with standard through-hole PCB assembly and socketing. 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 | Main supply input - accepts 1.0V–5.5V; bypass capacitor required at this pin for noise immunity |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane with low-inductance path |
| 7 | RESET | Active-low open-drain reset output - requires external pull-up resistor to define logic-high level |
Key Features
| Feature | Design Value |
|---|---|
| +3V System Optimization | Factory-trimmed 3.08V reset threshold matches nominal +3V rail tolerances without calibration |
| No External Components | Integrated timing and comparator eliminate need for external R/C network or trimming potentiometer |
| Low-Power Supervision | 35µA supply current enables use in always-on monitoring circuits without significant battery drain |
| Brownout Immunity | Guaranteed reset assertion down to VCC = 1V ensures deterministic behavior during deep undervoltage events |
| Transient Rejection | Immunity to sub-40µs negative VCC spikes prevents spurious resets in motor-driven or switching-power environments |
Applications
| Industrial PLC Controller | Medical Sensor Node |
|---|---|
Use Scenario: Programmable logic controller operating from unregulated 3.3V DC-DC converter in factory automation cabinet. IC Role / Device Role / Timing Role: Power-supply monitor asserting hardware reset to ARM Cortex-M7 MCU during input voltage sags caused by shared 24V bus transients. Use Value: Prevents firmware lockup by guaranteeing ≥140ms reset hold time after brownout recovery, independent of external component aging. | Use Scenario: Portable patient vital-sign monitor powered by Li-ion battery with 3.0V nominal output. IC Role / Device Role / Timing Role: Supervisor ensuring clean boot sequence when battery voltage drops near end-of-discharge (3.1V threshold crossing). Use Value: 3.08V ±2% threshold precisely aligns with battery cutoff profile, avoiding premature shutdown or unsafe undervoltage operation. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Under-hood BCM exposed to load-dump and cold-crank conditions on 3.3V auxiliary rail. IC Role / Device Role / Timing Role: Reset generator holding microcontroller in reset during cold-crank voltage dip below 3.0V. Use Value: Operates down to 1V supply and rejects ≤40µs transients - maintains reliability despite harsh automotive electrical environment. | Use Scenario: DIN-rail mounted electricity meter with isolated 3.3V supply derived from mains transformer. IC Role / Device Role / Timing Role: Primary supervisor validating stable 3.3V rail before enabling metrology ADC and secure bootloader. Use Value: Eliminates need for external voltage divider or comparator - reduces BOM count and improves long-term threshold 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 |
|---|---|---|---|
| MAX706TCSA+ | Same 3.08V threshold and 140ms timeout, but in 8-pin SO package (surface-mount) | Requires rework for PCB layout - not drop-in compatible with through-hole DIP footprint | Select for space-constrained or automated SMT production; verify thermal derating for SO package (471mW max @ +70°C) |
| TPS3808G30DBVR | 3.0V threshold (±0.5%), 200ms fixed timeout, 1.4µA quiescent current, but no transient immunity spec | Lacks documented rejection of negative VCC transients - may require additional filtering in noisy environments | Prefer for ultra-low-power battery applications where transient immunity is secondary to current draw |
Compared with MAX709TEPA+, MAX706TCSA+ offers identical supervision specs in SO packaging for modern layouts, while TPS3808G30DBVR trades transient robustness for extreme low-power operation - making MAX709TEPA+ optimal for industrial DIP-based designs needing proven noise resilience.
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 across extended temperature ranges and long production lifecycles.
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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX709 belongs to Maxim's µP supervisory circuit family, engineered specifically to replace discrete reset solutions in cost-sensitive, space-constrained microprocessor systems requiring precise, maintenance-free power monitoring.
FAQ
What is the exact reset threshold voltage of the MAX709TEPA+?
The MAX709TEPA+ has a factory-trimmed nominal reset threshold of 3.08V with ±2% tolerance over the full −40°C to +85°C operating range. This value is specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix 'T', and confirmed by the Ordering Information table listing MAX709T with 3.08V.
Does the MAX709TEPA+ require external components to function?
No - the MAX709TEPA+ requires no external resistors, capacitors, or trimming components. Its 140ms reset timeout is generated by an internal oscillator, and the 3.08V threshold is laser-trimmed during manufacturing. Only a 0.1µF bypass capacitor on VCC (pin 2) is recommended for transient immunity, per Applications Information.
Can the MAX709TEPA+ operate reliably below 3V supply voltage?
Yes - the MAX709TEPA+ remains fully functional down to VCC = 1.0V. Its RESET output is guaranteed to maintain correct logic state (active-low) throughout this range, and it continues to assert reset until VCC rises above 3.08V and sustains the 140ms timeout. Below 1V, RESET becomes high-impedance.
What package type does the MAX709TEPA+ use, and is it lead-free?
The MAX709TEPA+ uses an 8-pin plastic DIP package (0.300" width), and the '+' suffix explicitly denotes lead-free RoHS-compliant construction per Maxim's ordering convention. The package outline matches JEDEC MS-001, with pin 1 identified by a notch or dot marking on the top surface.
How does the MAX709TEPA+ handle short negative voltage transients on VCC?
The MAX709TEPA+ is designed to ignore short negative-going VCC transients: it will not issue a false reset pulse for glitches ≤40µs duration when the transient magnitude is ≤100mV below the 3.08V threshold. This immunity is characterized in Figure 1 of the datasheet and applies specifically to the MAX709R/S/T variants including MAX709TEPA+.
MAX709TEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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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