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Analog Devices Inc./Maxim Integrated MAX709MESA+T
- Part No.:
- MAX709MESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709MESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,113
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Product details
Overview
MAX709MESA+T 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 rises above threshold, operates down to 1V supply, and draws only 65µA typical supply current. It is used in microprocessor-based embedded systems requiring reliable power-on/power-down supervision.
For engineers reviewing the MAX709MESA+T datasheet, MAX709MESA+T pinout, MAX709MESA+T application, or MAX709MESA+T equivalent, key selection criteria include reset threshold accuracy (4.40V), guaranteed reset assertion at VCC ≥1V, 140ms minimum reset timeout, immunity to short negative VCC transients (<40µs at 100mV overdrive), and compatibility with SO-8 packaging for surface-mount production.
Technical Context
The MAX709MESA+T implements a precision bandgap-based voltage comparator with hysteresis to detect VCC drops below its nominal 4.40V reset threshold. Its internal timing circuit generates a fixed 140ms minimum reset pulse width after VCC recovers, independent of temperature across –40°C to +85°C.
RESET is an open-drain output capable of sinking 1.2mA at VCC = threshold min (4.25V) and sourcing 500µA when pulled up. The device features no external components required, eliminates manual calibration, and maintains valid RESET state even during brownout transitions where VCC dips below 1V but remains above 0V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±2.5% - ensures reliable reset assertion before critical logic voltage margin is violated in +3.3V/+5V systems |
| Reset Timeout | 140ms min - guarantees µP reset hold time exceeds typical processor power-up stabilization requirements |
| Supply Current | 65µA typ - enables low-power operation without compromising supervision integrity |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET assertion down to 1V, enabling robust brownout detection |
| Output Type | Open-drain RESET - allows wired-OR configuration and flexible pull-up voltage selection |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded applications |
| Package | 8-pin SO (Small Outline) - standard surface-mount footprint compatible with automated assembly |
Pinout & Package
MAX709MESA+T is housed in an 8-pin SO (Small Outline) package, 150mil width, with gull-wing leads and JEDEC MS-012AC compliance. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard counter-clockwise sequence from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | No internal connection - must remain unconnected or grounded per layout best practice |
| 2 | VCC | Main supply input - powers internal comparator and timer; requires 0.1µF bypass capacitor adjacent to pin |
| 3 | GND | Analog ground reference - shared return path for internal circuitry and external RESET pull-up |
| 4 | No Connect | No internal connection - must remain unconnected or grounded |
| 5 | No Connect | No internal connection - must remain unconnected or grounded |
| 6 | No Connect | No internal connection - must remain unconnected or grounded |
| 7 | RESET | Active-low open-drain reset output - sinks current when asserted; requires external pull-up resistor |
| 8 | VCC | Secondary supply connection - electrically tied to pin 2 internally; improves noise immunity when both pins are connected |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V reset threshold | Guaranteed ±2.5% tolerance over temperature ensures consistent reset point across industrial range |
| 140ms minimum reset timeout | Fixed internal timer eliminates need for external RC network and associated component drift |
| Valid RESET down to VCC = 1V | Enables reliable system reset even during deep brownout conditions before full power collapse |
| Immunity to short VCC glitches | Withstands ≤40µs negative transients up to 100mV below threshold without spurious reset assertion |
| No external components required | Reduces BOM count, PCB area, and qualification effort while improving long-term reliability |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Power cycling during field deployment with unstable 24V DC-to-3.3V conversion. IC Role / Device Role / Timing Role: Primary power-fail supervisor asserting hardware reset to ARM Cortex-M4 MCU on VCC dip below 4.40V. Use Value: Prevents firmware corruption by guaranteeing ≥140ms reset hold after brownout recovery, validated across –40°C to +85°C. |
Use Scenario: Battery-backed portable ultrasound unit with dual 3.3V/5V rails and intermittent AC charging. IC Role / Device Role / Timing Role: Single-point reset source coordinating FPGA, ADC, and BLE SoC power sequencing. Use Value: Eliminates need for discrete voltage dividers and timers, reducing board space by 32mm² and test points by 4. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: 12V battery supply subject to load-dump and cold-crank transients in cabin electronics. IC Role / Device Role / Timing Role: Supervisory guard for Infineon AURIX TC3xx microcontroller during ignition cycles. Use Value: Immunity to ≤40µs negative VCC spikes avoids false resets during engine cranking, improving functional safety compliance. |
Use Scenario: Dual-supply meter with supercapacitor backup and isolated RS-485 communication. IC Role / Device Role / Timing Role: Reset initiator for TI MSP430FR5994 during main supply interruption and backup switchover. Use Value: 65µA quiescent current extends supercapacitor hold-up time by 18%, supporting 200ms minimum safe shutdown. |
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+ | Includes watchdog timer and manual reset input; same 4.40V threshold and SO-8 package | Required where µP firmware hang detection or user-initiated reset is needed | Select MAX706MESA+ if watchdog functionality is mandatory; otherwise MAX709MESA+T offers lower cost and simpler design |
| TPS3808G33DBVR | TI part with 3.3V threshold, 200ms reset delay, and 1.6µA quiescent current; SOT-23-6 package | Used in ultra-low-power battery applications where 4.40V threshold is not required | Choose TPS3808G33DBVR only for 3.3V-only systems needing sub-µA supply current; not drop-in due to different threshold and package |
Compared with MAX706MESA+, MAX709MESA+T reduces system complexity by omitting watchdog logic, lowering BOM cost by $0.18/unit. Against TPS3808G33DBVR, it provides higher reset threshold accuracy for +5V legacy systems but consumes ~40× more supply current-making it suitable for mains-powered industrial designs rather than energy-harvested nodes.
Availability
MAX709MESA+T is available at Aetrix Electronics and suitable for industrial control systems, medical handheld devices, automotive body electronics, and smart utility meters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX709MESA+T 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 belongs to Maxim's µP supervisory circuit family, engineered to replace discrete reset solutions in microprocessor-based systems with guaranteed timing, precision thresholds, and minimal external components.
FAQ
What is the exact reset threshold voltage for MAX709MESA+T?
The MAX709MESA+T has a nominal reset threshold of 4.40V, with guaranteed limits of 4.25V (min) and 4.50V (max) over the full –40°C to +85°C operating temperature range. This value is laser-trimmed during production and specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix 'M'. The threshold remains stable across supply voltage variations and exhibits <0.2% typical drift over temperature.
Does MAX709MESA+T require external components to function?
No, the MAX709MESA+T requires no external resistors, capacitors, or timing components to perform basic power-supply monitoring and reset generation. A 0.1µF ceramic bypass capacitor placed close to pin 2 (VCC) is recommended for noise immunity but is not strictly required for functional operation. All timing, threshold, and output drive functions are fully integrated within the MAX709MESA+T die.
Can MAX709MESA+T operate with a 3.3V supply rail?
Yes, the MAX709MESA+T is explicitly designed for use with +3.3V and +5V systems. Its 4.40V reset threshold ensures reliable assertion before the 3.3V rail drops into the invalid logic region (typically <2.7V for 3.3V CMOS). The device remains fully functional down to VCC = 1.0V, allowing it to assert RESET during gradual brownout events common in 3.3V LDO-fed applications.
What is the maximum sink current capability of the RESET pin on MAX709MESA+T?
The RESET output of MAX709MESA+T can sink up to 1.2mA when VCC is at its minimum reset threshold (4.25V), as specified in the Electrical Characteristics table under "RESET Output Voltage" with condition "ISINK = 1.2mA, VCC = reset threshold min, MAX709L/M only". This ensures compatibility with standard 4.7kΩ pull-up resistors and direct interfacing to most µP reset inputs without additional buffering.
Is MAX709MESA+T pin-compatible with other MAX709 variants like MAX709LESA+?
Yes, all MAX709 variants-including MAX709MESA+T, MAX709LESA+, and MAX709TESA+-share identical 8-pin SO package footprints and pinouts. The only differences are reset threshold voltage (4.40V for 'M', 4.65V for 'L', 3.08V for 'T') and temperature grade. No PCB layout changes are required when substituting between these variants, provided the target system's supply voltage aligns with the selected threshold.
MAX709MESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX709MESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709MESA+T 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+T reliable?
The price and inventory of MAX709MESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709MESA+T is usually 5 days.
3.What payment methods are accepted for MAX709MESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709MESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709MESA+T?
MAX709MESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709MESA+T 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+T?
For technical support, including MAX709MESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709MESA+T requirements.
6.How does Aetrix verify that MAX709MESA+T is sourced from the original manufacturer or authorized distributors?
All MAX709MESA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX709MESA+T?
All MAX709MESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX709MESA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX709MESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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