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Analog Devices Inc./Maxim Integrated MAX709LCSA-T
- Part No.:
- MAX709LCSA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709LCSA-T.pdf
- Description:
- IC SUPERVISOR PWR SUP MON RESET
- Quantity:
- Payment:
- Shipping:
Inventory:1,722
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Product details
Overview
MAX709LCSA-T from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +5V, +3.3V, and +3V systems. It asserts RESET when VCC falls below 4.65V (nominal), holds reset for ≥140ms after VCC rises above threshold, and guarantees correct RESET state down to VCC = 1V. Used in microprocessor-based embedded controllers to ensure reliable power-on initialization and brownout recovery.
For engineers reviewing the MAX709LCSA-T datasheet, MAX709LCSA-T pinout, MAX709LCSA-T application, or MAX709LCSA-T equivalent, key selection criteria include reset threshold accuracy (±150mV), guaranteed minimum reset timeout (140ms), supply current (65µA typical), immunity to short VCC transients (<40µs at 100mV overdrive), and compatibility with SO-8 packaging for space-constrained designs.
Technical Context
The MAX709LCSA-T integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET driver. Its reset threshold is factory-trimmed to 4.65V ±150mV and exhibits <0.2% temperature drift across –40°C to +85°C. The device operates from 1.0V to 5.5V and maintains valid RESET output state even as VCC decays to 1V.
It features no external components required for basic reset functionality, eliminates manual calibration, and provides transient immunity against negative VCC glitches up to 40µs duration when overdriven by 100mV. The 140ms minimum reset timeout is internally generated and independent of external RC networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65V nominal, ±150mV tolerance - ensures reliable detection of +5V rail collapse before µP malfunction. |
| Reset Timeout | ≥140ms after VCC rise - meets Intel-compatible power-on reset timing requirements for x86 and ARM processors. |
| Supply Current | 65µA typical at VCC = 5.5V - enables low-power operation in battery-backed or energy-sensitive systems. |
| VCC Operating Range | 1.0V to 5.5V - supports valid RESET assertion during deep brownout and allows system-level power sequencing. |
| RESET Output Type | Open-drain, 20mA sink capability - permits wired-OR configuration and level translation with external pull-up. |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade operation without derating or external compensation. |
| Package | 8-pin SO (SOIC) - surface-mount compatible with standard reflow profiles and IPC-7351B land patterns. |
Pinout & Package
MAX709LCSA-T is supplied in an 8-pin SO (SOIC) package, 3.9mm × 4.9mm body, 1.27mm pitch. Pin 1 is marked with a beveled corner or dot; pins are numbered counterclockwise from pin 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect (N.C.) | Internally unconnected - must remain floating or tied to GND per layout best practice; no routing or loading required. |
| 2 | VCC | Main supply input - accepts +3V, +3.3V, or +5V; requires 0.1µF bypass capacitor placed adjacent to pin. |
| 3 | GND | Analog ground reference - must connect to system ground plane with low-inductance path to minimize noise coupling. |
| 7 | RESET | Active-low open-drain reset output - sinks current during fault; requires external pull-up resistor for logic-high state. |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Eliminates RC timing network, trimming potentiometers, and discrete comparators - reduces BOM count and layout area by ≥4 parts. |
| Precision 4.65V reset threshold | Factory-trimmed to ±150mV over temperature - avoids recalibration and ensures consistent reset behavior across production lots. |
| 140ms minimum reset timeout | Guaranteed minimum delay ensures µP clocks and memory stabilize before release - prevents race conditions in boot firmware. |
| Immunity to short VCC transients | Withstands ≤40µs negative glitches at 100mV overdrive - suppresses false resets caused by switching noise or ESD events. |
| Valid RESET down to VCC = 1V | Ensures deterministic reset state during slow power-down - critical for nonvolatile register retention and safe shutdown sequences. |
Applications
| Industrial PLC Controller | Medical Diagnostic Device |
|---|---|
Use Scenario: Power cycling during field maintenance or battery swap in programmable logic controller modules. IC Role / Device Role / Timing Role: System-level power supervisor that initiates controlled µP reset and disables I/O drivers during undervoltage. Use Value: Prevents spurious relay actuation or sensor misreads by enforcing ≥140ms reset hold time while VCC recovers from sag. |
Use Scenario: Emergency power loss during imaging acquisition in portable ultrasound units. IC Role / Device Role / Timing Role: Brownout detector that triggers safe data flush and volatile memory freeze before VCC drops below 4.65V. Use Value: Guarantees 4.65V threshold accuracy and 1V operational floor to preserve last-scan buffer integrity during rapid discharge. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: Load dump or cold-crank event causing 12V rail dip into 5V domain in BCM sub-systems. IC Role / Device Role / Timing Role: Reset generator interfacing with CAN-enabled microcontroller via open-drain RESET line. Use Value: Immunity to ≤40µs transients prevents nuisance resets during alternator switching noise, improving ASIL-B compliance. |
Use Scenario: Mains interruption followed by supercapacitor backup activation in revenue-grade metering hardware. IC Role / Device Role / Timing Role: Primary supervisor ensuring µP remains held in reset until backup rail stabilizes above 4.65V. Use Value: 65µA supply current minimizes backup energy drain; SO-8 footprint enables compact dual-rail monitoring PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power-supply monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCSA | Same SO-8 package, identical 4.65V threshold and 140ms timeout, but includes watchdog timer and manual reset input. | Required where system-level software hang detection or operator-initiated reset is needed alongside power monitoring. | Select MAX706RCSA only if watchdog or manual reset functionality is explicitly required; adds complexity and cost vs. MAX709LCSA-T. |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 200ms timeout, 1.8–6V VCC range, and push-pull RESET output (not open-drain). | Suitable for 3.3V-only systems needing higher timeout margin or direct interface to CMOS inputs without pull-up. | Not interchangeable without schematic and layout changes; different threshold, output type, and timing invalidate drop-in use. |
Compared with MAX706RCSA, MAX709LCSA-T offers lower cost and simpler integration where watchdog and manual reset are unnecessary; compared with TPS3808G33DBVR, it provides precise 4.65V detection and open-drain flexibility for multi-source reset buses, but lacks push-pull drive and requires external pull-up.
Availability
MAX709LCSA-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and automotive body electronics requiring stable component supply, long-term lifecycle support, and RoHS-compliant SO-8 packaging.
Supply support for MAX709LCSA-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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX709LCSA-T belongs to Maxim's µP supervisory circuit family, engineered specifically for reliable, low-cost power monitoring in microprocessor-based systems where deterministic reset timing and minimal external components are critical design constraints.
FAQ
What is the exact reset threshold voltage of the MAX709LCSA-T?
The MAX709LCSA-T has a nominal reset threshold of 4.65V, with a guaranteed tolerance of ±150mV 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 'L'. The device asserts RESET when VCC falls below this threshold and releases it only after VCC rises above the threshold and the 140ms timeout expires. The MAX709LCSA-T does not require external calibration to achieve this accuracy.
Does the MAX709LCSA-T require external components to function?
No, the MAX709LCSA-T operates fully autonomously with no external components required for basic reset functionality. A 0.1µF ceramic bypass capacitor on VCC (pin 2) is recommended for transient immunity but is not strictly required for DC operation. Unlike discrete comparator-based solutions, the MAX709LCSA-T integrates the voltage reference, comparator, timing circuit, and output driver - eliminating resistors, capacitors, and trimming elements typically needed in custom reset circuits.
Can the MAX709LCSA-T be used with a 3.3V microprocessor supply?
Yes, the MAX709LCSA-T is explicitly rated for use with +3.3V systems, as confirmed in the General Description and Features sections. Its 4.65V reset threshold ensures it detects brownout conditions on a 5V rail supplying the µP, while its VCC operating range (1.0V to 5.5V) and RESET output validity down to 1V allow robust interfacing. For 3.3V-only rails, consider MAX709T (3.08V threshold) instead - the MAX709LCSA-T is optimized for 5V domains.
What is the maximum allowable VCC transient duration the MAX709LCSA-T can ignore?
The MAX709LCSA-T can ignore negative-going VCC transients up to 40µs in duration when the glitch magnitude is ≤100mV below the 4.65V reset threshold, as shown in Figure 1 of the datasheet. This immunity is inherent to the internal comparator design and does not rely on external filtering. Adding a 0.1µF capacitor at VCC (pin 2) further enhances rejection of high-frequency noise, making the MAX709LCSA-T suitable for electrically noisy environments like motor drives or switch-mode power supplies.
Is the MAX709LCSA-T pin-compatible with other MAX709 variants?
Yes, all MAX709 variants - including MAX709LCSA-T, MAX709MCSA, MAX709RCSA, etc. - share identical 8-pin SO (SOIC) packaging and pinout. Pins 1, 4, 5, 6, and 8 are N.C.; pin 2 is VCC; pin 3 is GND; and pin 7 is RESET. The only functional difference between variants is the factory-set reset threshold voltage (e.g., 4.65V for 'L', 4.40V for 'M'). No PCB layout change is needed when substituting within the MAX709 family, provided the threshold voltage matches the target rail.
MAX709LCSA-T 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:
- 4.65V
- 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
MAX709LCSA-T FAQ
1.How can I place an order for MAX709LCSA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709LCSA-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 MAX709LCSA-T reliable?
The price and inventory of MAX709LCSA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709LCSA-T is usually 5 days.
3.What payment methods are accepted for MAX709LCSA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709LCSA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709LCSA-T?
MAX709LCSA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709LCSA-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 MAX709LCSA-T?
For technical support, including MAX709LCSA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709LCSA-T requirements.
6.How does Aetrix verify that MAX709LCSA-T is sourced from the original manufacturer or authorized distributors?
All MAX709LCSA-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 MAX709LCSA-T meets industry standards.
7.What is the process for return or replacement of MAX709LCSA-T?
All MAX709LCSA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX709LCSA-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 MAX709LCSA-T part is unused and in its original packaging.
Return procedure for MAX709LCSA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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