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Analog Devices Inc./Maxim Integrated MAX709TCSA+T
- Part No.:
- MAX709TCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709TCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,318
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Product details
Overview
MAX709TCSA+T 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 (±0.08V), holds reset for ≥140ms after VCC recovers, operates down to 1V supply, draws only 35µA, and is housed in an 8-pin SO package. It enables reliable microprocessor reset in embedded controllers and industrial sensors.
For engineers reviewing the MAX709TCSA+T datasheet, MAX709TCSA+T pinout, MAX709TCSA+T application, or MAX709TCSA+T equivalent, key selection criteria include reset threshold accuracy (3.08V), guaranteed reset assertion at VCC ≥1V, 140ms minimum power-on delay, immunity to short negative VCC transients (<40µs at 100mV overdrive), and compatibility with 3V/3.3V/5V logic interfaces.
Technical Context
The MAX709TCSA+T integrates a precision voltage comparator with hysteresis, a 140ms monostable timer, and an open-drain RESET output driver. Its reset threshold is factory-trimmed to 3.08V (nominal) with ±2.6% tolerance over –40°C to +85°C, and its internal reference remains stable across temperature (±0.5% typical drift).
It requires no external components for basic operation, features built-in immunity to VCC glitches ≤40µs (at 100mV overdrive), and guarantees valid RESET state down to VCC = 1V - enabling robust brownout detection in low-voltage microcontroller systems without external pull-up or buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±0.08V - ensures reliable reset activation before 3V system logic fails. |
| Power-On Reset Delay | ≥140ms - guarantees µP initialization completes before release from reset. | Supply Current | 35µA typical at 3.6V - enables battery-backed or ultra-low-power monitoring. |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout. |
| Output Type | Open-drain RESET - allows wired-OR configuration and level translation. |
| Temperature Range | –40°C to +85°C - qualified for industrial ambient environments. |
| Package | 8-pin SO (Small Outline) - surface-mount compatible with standard PCB assembly. |
Pinout & Package
MAX709TCSA+T is supplied in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant. Pin 1 is top-left corner (notch-marked), pin numbering counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | No internal connection - must be left floating or tied to GND per layout best practice. |
| 2 | VCC | Main supply input (1.0–5.5V); powers internal comparator and timer. |
| 3 | GND | Analog/digital ground reference - must be low-impedance and adjacent to VCC bypass capacitor. |
| 4 | No Connect | No internal connection - must be left floating or tied to GND. |
| 5 | No Connect | No internal connection - must be left floating or tied to GND. |
| 6 | No Connect | No internal connection - must be left floating or tied to GND. |
| 7 | RESET | Active-low open-drain output - sinks current when asserted; requires external pull-up. |
| 8 | No Connect | No internal connection - must be left floating or tied to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 3.08V reset threshold | Factory-trimmed ±0.08V tolerance ensures accurate brownout detection in 3V systems. |
| 140ms minimum reset timeout | Guaranteed hold time prevents premature µP release during unstable power ramp-up. |
| Valid RESET down to VCC = 1V | Enables deterministic reset behavior during deep undervoltage conditions. |
| Immunity to VCC glitches ≤40µs | Rejects transient noise without false resets - reduces need for external filtering. |
| 35µA supply current | Minimizes standby power draw in always-on monitoring applications. |
Applications
| Industrial PLC I/O Modules | Smart Energy Meters |
|---|---|
Use Scenario: Power rails experience slow ramp-up and intermittent brownouts due to transformer-coupled supplies and load switching. IC Role / Device Role / Timing Role: Power-supply monitor providing precise 3.08V reset assertion and ≥140ms hold time to ensure firmware integrity during grid fluctuations. Use Value: Eliminates need for external RC timing network while guaranteeing µP reset validity down to 1V - critical for nonvolatile register retention. | Use Scenario: Battery-backed real-time clock and metrology ASIC require fail-safe reset during main supply interruption. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET on main VCC drop below 3.08V and holding for 140ms to allow backup switchover and state save. Use Value: Open-drain RESET output enables seamless OR-ing with battery supervisor outputs - no additional logic required. |
| Medical Diagnostic Handhelds | Automotive Body Control Modules |
Use Scenario: Li-ion powered devices undergo rapid VCC collapse during battery depletion or connector disconnection. IC Role / Device Role / Timing Role: System reset generator detecting 3.08V threshold breach and issuing clean, glitch-immune reset pulse. Use Value: Immunity to <40µs negative VCC transients prevents spurious resets during hot-plug events or ESD-induced rail dips. | Use Scenario: 12V-to-3.3V DC/DC output powers MCU and CAN transceivers; experiences load dump and cold-crank transients. IC Role / Device Role / Timing Role: Voltage monitor ensuring µP remains held in reset until regulated 3.3V rail stabilizes post-cold-crank. Use Value: Valid RESET output at VCC ≥1V enables safe shutdown sequencing even during severe undervoltage - avoids corrupted EEPROM writes. |
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+ | Includes watchdog timer and manual reset input; same 3.08V threshold and 140ms delay. | Required where system-level watchdog supervision or user-initiated reset is needed. | Select MAX706TCSA+ if watchdog functionality or MR pin control is mandatory; otherwise MAX709TCSA+T offers lower cost and simpler BOM. |
| TPS3808G30DBVR | TI part with 3.0V threshold (±0.5%), 200ms delay, 1.8–6.0V operation, and push-pull RESET. | Preferred where higher reset delay margin or push-pull output eliminates external pull-up. | Choose TPS3808G30DBVR for designs requiring longer reset hold time or simplified interface; MAX709TCSA+T retains advantage in ultra-low quiescent current (35µA vs. 80µA). |
Compared with MAX706TCSA+, MAX709TCSA+T saves board space and cost by omitting watchdog circuitry; versus TPS3808G30DBVR, it delivers lower supply current and tighter threshold tolerance but requires external pull-up and lacks push-pull drive - making it optimal for cost-sensitive, low-power 3V systems without watchdog needs.
Availability
MAX709TCSA+T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, smart energy meters, medical handheld diagnostics, and automotive body control modules requiring stable component supply, long-term lifecycle support, and lead-free compliance.
Supply support for MAX709TCSA+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 consumer applications.
The MAX709 belongs to Maxim's µP supervisory circuit family, engineered to replace discrete reset solutions in microprocessor-based systems with minimal external components and guaranteed timing accuracy.
FAQ
What is the exact reset threshold voltage of the MAX709TCSA+T?
The MAX709TCSA+T has a nominal reset threshold of 3.08V, with a guaranteed range of 3.00V to 3.15V over the full operating temperature range (–40°C to +85°C). 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 ≤±0.5% drift, making it suitable for precision 3V system monitoring.
Does the MAX709TCSA+T require external components to function?
No, the MAX709TCSA+T requires no external components for basic reset functionality. A 0.1µF ceramic bypass capacitor between VCC (pin 2) and GND (pin 3) is strongly recommended for noise immunity, but no resistors, capacitors, or diodes are needed for threshold setting or timing. Its internal 140ms delay and precision reference eliminate the need for RC networks typically used in discrete reset circuits.
Can the MAX709TCSA+T operate reliably below 3V supply?
Yes, the MAX709TCSA+T is fully functional down to VCC = 1.0V. Its RESET output is guaranteed to remain valid (low when asserted) with VCC as low as 1V, and the device continues to monitor supply voltage and assert reset correctly during deep brownout. Below 1V, RESET becomes high-impedance - a design feature documented in the Applications Information section.
What is the purpose of the N.C. pins on the MAX709TCSA+T?
The MAX709TCSA+T has five No-Connect (N.C.) pins (pins 1, 4, 5, 6, and 8). These pins have no internal connection and must be left unconnected or tied to GND per PCB layout best practices - they are not reserved for future functionality or test purposes. Leaving them floating is acceptable, but grounding reduces potential noise coupling and improves mechanical stability during reflow.
Is the MAX709TCSA+T pin-compatible with other MAX709 variants like MAX709R or MAX709S?
Yes, all MAX709 variants - including MAX709TCSA+T, MAX709RCSA+T, and MAX709SCSA+T - share identical pinout, package, and electrical interface. Only the reset threshold voltage differs (3.08V for 'T', 2.63V for 'R', 2.93V for 'S'). This allows direct substitution in the same footprint when adjusting for different supply rail requirements, provided the new threshold aligns with system voltage margins.
MAX709TCSA+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:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX709TCSA+T FAQ
1.How can I place an order for MAX709TCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709TCSA+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 MAX709TCSA+T reliable?
The price and inventory of MAX709TCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709TCSA+T is usually 5 days.
3.What payment methods are accepted for MAX709TCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709TCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709TCSA+T?
MAX709TCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709TCSA+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 MAX709TCSA+T?
For technical support, including MAX709TCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709TCSA+T requirements.
6.How does Aetrix verify that MAX709TCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX709TCSA+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 MAX709TCSA+T meets industry standards.
7.What is the process for return or replacement of MAX709TCSA+T?
All MAX709TCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX709TCSA+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 MAX709TCSA+T part is unused and in its original packaging.
Return procedure for MAX709TCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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