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Analog Devices Inc./Maxim Integrated MAX709SCSA+
- Part No.:
- MAX709SCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX709SCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:124
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Product details
Overview
MAX709SCSA+ from Maxim Integrated is a precision power-supply monitor IC with active-low reset output, designed for +3V systems (2.93V nominal reset threshold), 140ms minimum power-on reset delay, guaranteed RESET state down to VCC = 1V, and immunity to short negative VCC transients - used in microprocessor-based embedded systems requiring reliable power-up/brownout supervision.
For engineers reviewing the MAX709SCSA+ datasheet, MAX709SCSA+ pinout, MAX709SCSA+ application, or MAX709SCSA+ equivalent, this page delivers verified package mapping (8-pin SO), confirmed electrical behavior (2.93V threshold, 35µA supply current), thermal performance data, and real-world interface guidance for µP reset pin contention and low-VCC validity.
Technical Context
The MAX709SCSA+ integrates a precision voltage comparator with hysteresis, internal timing capacitor, and open-drain RESET driver - no external components required. Its reset threshold is factory-trimmed to 2.93V ±1.5%, and the 140ms reset timeout is internally generated with temperature stability better than ±10% over –40°C to +85°C.
It operates across VCC = 1.0V to 5.5V, sinks up to 1.2mA at VCC ≥ reset threshold min, and maintains valid RESET output state even during fast VCC transients (≤40µs for 100mV overdrive). The device uses substrate-connected-to-VCC construction and features 380-transistor die topology optimized for low-power supervisory function.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - ensures reliable detection of brownout in +3V systems before µP malfunction occurs |
| Power-On Reset Delay | 140ms min - holds µP in reset long enough for power rails and clocks to stabilize |
| Supply Current | 35µA typ at VCC = 3.6V - enables battery-backed operation without significant drain |
| VCC Operating Range | 1.0V to 5.5V - supports operation down to near-dead-battery conditions while maintaining RESET validity |
| RESET Output Type | Open-drain, active-low - allows wired-OR configuration and level translation with external pull-up |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded applications |
| Package | 8-pin SO (Small Outline) - surface-mount compatible with standard PCB assembly processes |
Pinout & Package
MAX709SCSA+ is housed in an 8-pin SO (Small Outline) package measuring 4.9mm × 6.0mm × 1.75mm (JEDEC MS-012AC), with GND on pin 3 and VCC on pin 2. Pin 1, 4, 5, 6, and 8 are no-connect (N.C.) internally; pin 7 is the active-low RESET output.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 5, 6, 8 | No Connect (N.C.) | No internal connection - must be left unconnected or tied to GND per layout best practice |
| 2 | VCC | Primary supply input - accepts +3V/+3.3V/+5V; bypass capacitor (0.1µF) required at pin for transient immunity |
| 3 | GND | Analog/digital ground reference - must be connected to system ground plane with low-inductance path |
| 7 | RESET | Open-drain active-low reset signal - requires external pull-up resistor (typically 10kΩ) to VCC or another rail |
Key Features
| Feature | Design Value |
|---|---|
| No external components needed | Internal timing capacitor and precision reference eliminate need for RC networks or trimming resistors |
| Immunity to short VCC glitches | Rejects transients ≤40µs wide when 100mV below threshold - prevents spurious resets in noisy environments |
| Valid RESET down to VCC = 1V | Ensures deterministic reset assertion even during deep brownout - critical for fail-safe shutdown |
| Low quiescent current | 35µA typical - extends battery life in portable or backup-power applications |
| Multiple reset thresholds | Five factory-set options (2.63V–4.65V) enable precise matching to system supply rails |
Applications
| Industrial PLC Controllers | Medical Diagnostic Handhelds |
|---|---|
Use Scenario: Microcontroller-based programmable logic controllers operating in factory-floor environments with fluctuating 24VDC-derived 3.3V supplies. IC Role / Device Role / Timing Role: Power-supply monitor providing brownout detection and 140ms power-on reset pulse to ensure deterministic firmware boot. Use Value: Prevents corrupted register states and undefined I/O behavior during unstable input voltage transitions. |
Use Scenario: Portable ultrasound or glucose meter devices powered by single-cell Li-ion batteries with regulated 3V output. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET when battery voltage drops below 2.93V, enabling graceful shutdown before data loss. Use Value: Guarantees safe state retention and nonvolatile memory write completion prior to power collapse. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: CAN-connected BCMs receiving switched 3.3V from vehicle battery via DC/DC converter subject to load-dump transients. IC Role / Device Role / Timing Role: Immune reset supervisor detecting VCC dips caused by alternator regulation faults or relay switching noise. Use Value: Eliminates false resets during engine cranking or accessory load switching - improves system robustness. |
Use Scenario: ANSI C12.20-compliant electricity meters with dual-supply architecture (main + supercap backup). IC Role / Device Role / Timing Role: Primary supervisor monitoring main 3V rail; asserts RESET to halt metrology processing during brownout. Use Value: Ensures accurate energy accumulation and tamper-resistant time-stamping during grid instability events. |
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 2.93V threshold, but includes manual reset input (MR) and watchdog timer (WDT) functionality | Required where system-level software-initiated reset or periodic WDT timeout is needed | Select MAX706RCSA+ only if MR or WDT capability is explicitly required; otherwise MAX709SCSA+ offers lower cost and simpler BOM |
| TPS3808G33DBVR | 2.93V threshold, 200ms reset delay, 1.6µA quiescent current, but push-pull RESET output (not open-drain) | Requires redesign of RESET pull-up network and may conflict with wired-OR configurations | Choose TPS3808G33DBVR only for ultra-low-power battery applications where 1.6µA supply current justifies interface changes |
Compared with MAX706RCSA+, MAX709SCSA+ eliminates unused WDT/MR circuitry for cost-sensitive designs; compared with TPS3808G33DBVR, it retains open-drain flexibility and proven glitch immunity at higher quiescent current - making it optimal for industrial 3V systems prioritizing reliability over nanoamp savings.
Availability
MAX709SCSA+ is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, smart energy meters, and battery-backed embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX709SCSA+ 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, automotive, and communications markets.
The MAX709SCSA+ belongs to Maxim's µP supervisory circuits product line, engineered specifically to replace discrete reset solutions in cost-sensitive, space-constrained embedded systems requiring guaranteed power-on/brownout reset behavior.
FAQ
What is the exact reset threshold voltage of the MAX709SCSA+?
The MAX709SCSA+ has a factory-trimmed nominal reset threshold of 2.93V, with a tolerance of ±1.5% over temperature (–40°C to +85°C). This value is specified in the Electrical Characteristics table under "RESET Threshold, VTH" for suffix 'S', and is validated across the full operating range without external calibration.
Does the MAX709SCSA+ require an external capacitor for reset timing?
No, the MAX709SCSA+ does not require an external capacitor. Its 140ms minimum power-on reset delay is generated by an internal timing circuit. No external components are needed for basic reset functionality - only a 0.1µF bypass capacitor on VCC (pin 2) is recommended for transient immunity.
Can the MAX709SCSA+ drive a microprocessor reset pin directly?
Yes, the MAX709SCSA+ can drive most µP reset pins directly via its open-drain RESET output (pin 7), provided an appropriate pull-up resistor (e.g., 10kΩ to VCC) is used. For µPs with bidirectional reset I/O (e.g., Motorola 68HC11), a 4.7kΩ series resistor is recommended to prevent contention, as documented in Maxim's Application Information section.
What is the lowest VCC voltage at which the MAX709SCSA+ guarantees correct RESET output state?
The MAX709SCSA+ guarantees correct RESET output state down to VCC = 1.0V. Below 1V, the RESET output becomes high-impedance (open-circuit); for applications requiring valid RESET down to 0V, a 100kΩ pull-down resistor on the RESET line is advised per Maxim's Figure 2.
Is the MAX709SCSA+ pin-compatible with other MAX709 variants like MAX709LCSA+?
Yes, all MAX709 variants including MAX709SCSA+ and MAX709LCSA+ share identical 8-pin SO packaging and pinout - only the reset threshold voltage differs (2.93V vs. 4.65V). No PCB layout change is required when substituting between suffixes, provided the target supply rail matches the selected threshold.
MAX709SCSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX709SCSA+ FAQ
1.How can I place an order for MAX709SCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX709SCSA+ 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 MAX709SCSA+ reliable?
The price and inventory of MAX709SCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX709SCSA+ is usually 5 days.
3.What payment methods are accepted for MAX709SCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX709SCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX709SCSA+?
MAX709SCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX709SCSA+ 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 MAX709SCSA+?
For technical support, including MAX709SCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX709SCSA+ requirements.
6.How does Aetrix verify that MAX709SCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX709SCSA+ 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 MAX709SCSA+ meets industry standards.
7.What is the process for return or replacement of MAX709SCSA+?
All MAX709SCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX709SCSA+, 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 MAX709SCSA+ part is unused and in its original packaging.
Return procedure for MAX709SCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX709SCSA+ Tags
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