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Analog Devices Inc./Maxim Integrated MAX708SCUA
- Part No.:
- MAX708SCUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708SCUA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:330
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Product details
Overview
MAX708SCUA from Maxim Integrated is a +3V microprocessor supervisory circuit in an 8-pin µMAX package, providing dual active-high and active-low reset outputs, 2.93V precision supply-voltage monitoring, 200ms reset pulse width, and a 1.25V power-fail comparator input-used for brownout protection and orderly shutdown in battery-powered portable instruments.
For engineers reviewing the MAX708SCUA datasheet, MAX708SCUA pinout, MAX708SCUA application, or MAX708SCUA equivalent, this page delivers verified functional identity, exact reset threshold (2.93V), guaranteed RESET assertion down to VCC = 1V, dual-reset output behavior, and confirmed µMAX-8 package mapping-critical for layout validation and system-level reliability design.
Technical Context
The MAX708SCUA implements a dual-reset generator with independent internal timing for both RESET (active-high) and RESET (active-low), each asserted for ≥200ms after VCC rises above 2.93V or MR is released. It lacks a watchdog timer-distinguishing it from MAX706/706A variants-and relies solely on power-supply monitoring and manual reset.
Its 1.25V precision reference drives the PFI comparator for external power-fail detection, with PFO asserting low when PFI falls below threshold; the device guarantees valid reset output down to VCC = 1V and draws only 100µA quiescent current at 3.3V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reliable reset assertion before µP operation becomes unstable under brownout |
| Reset Pulse Width | 200ms minimum; provides sufficient time for µP initialization and peripheral stabilization |
| Supply Voltage Range | 1.2V to 5.5V; supports operation during deep brownout and compatibility with +3.3V/+5V systems |
| Quiescent Current | 100µA at VCC = 3.3V; enables long battery life in portable equipment |
| Power-Fail Comparator | 1.25V internal reference with PFI input; allows configurable early-warning detection of unregulated supply collapse |
| Output Drive | RESET sinks 1.2mA at VOL ≤ 0.3V (VCC < 3.6V); ensures robust TTL/CMOS interface without external pull-ups |
| Package | 8-pin µMAX (U8-1); 3mm × 3mm surface-mount footprint with exposed pad for thermal performance |
Pinout & Package
MAX708SCUA is housed in an 8-pin µMAX package (package code U8-1), a compact 3mm × 3mm surface-mount outline with exposed thermal pad. Pin numbering follows standard µMAX top-view orientation (pin 1 at top-left corner, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with ~70µA; debounced by 200ms reset timer |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; reset guaranteed active down to VCC = 1V |
| 3 (GND) | Ground reference | Common return for all internal circuits and output drivers |
| 4 (PFI) | Power-fail comparator input | High-impedance node referenced to 1.25V; used with external resistor divider to monitor auxiliary supplies |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; can drive µP interrupt or MR to trigger cascaded reset |
| 6 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet |
| 7 (RESET) | Active-low reset output | Asserted low during power-up/brownout/manual reset; holds low ≥200ms after condition clears |
| 8 (RESET) | Active-high reset output | Complementary to pin 7; asserted high during same conditions; enables mixed-logic system interfacing |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic designs |
| Precision 2.93V threshold | Guaranteed ±1% tolerance over temperature; matches typical +3.3V µP VDD min spec for fail-safe startup |
| 1.25V power-fail comparator | Enables early warning of unregulated rail collapse (e.g., battery depletion or DC-DC dropout) via user-configurable PFI divider |
| 200ms reset timeout | Internally timed; ensures µP and peripherals fully stabilize before release-no external RC components required |
| Low 100µA supply current | Extends battery runtime in portable instruments without compromising reset accuracy or speed |
Applications
| Portable Medical Monitors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG waveform acquisition powered by Li-ion battery with optional USB charging. IC Role / Device Role / Timing Role: Supervises main +3.3V rail and triggers controlled shutdown when battery voltage drops below safe operating level. Use Value: Prevents data corruption during brownout by asserting dual reset signals before µP enters undefined state; PFI monitors raw battery voltage pre-regulator for predictive low-battery alert. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 seconds using intermittent wake-up. IC Role / Device Role / Timing Role: Ensures clean µP reset on cold start and battery insertion; coordinates graceful sleep-state exit and flash write completion. Use Value: 200ms reset pulse guarantees stable clock and memory initialization; 100µA quiescent current minimizes standby drain-extending 2-year battery life target. |
| Industrial Handheld Terminals | Smart Meters with Tamper Detection |
Use Scenario: Ruggedized terminal running real-time OS, powered by replaceable alkaline pack with wide VCC variation. IC Role / Device Role / Timing Role: Monitors +3.3V supply across full battery discharge curve (4.2V → 2.8V); asserts reset at 2.93V to prevent firmware crash. Use Value: Dual RESET/RESET outputs interface directly with both µP reset pin and FPGA configuration logic-eliminating level-shifting components. |
Use Scenario: Electricity meter with secure bootloader and cryptographic key storage requiring tamper-evident power loss detection. IC Role / Device Role / Timing Role: Uses PFI to monitor backup supercapacitor voltage; PFO triggers secure erase sequence upon imminent power failure. Use Value: 1.25V comparator reference enables precise trip point setting (±10mV hysteresis supported); guaranteed RESET assertion to VCC = 1V ensures last-instruction integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SEUA | Same functionality and pinout; rated for -40°C to +85°C industrial temperature range vs. 0°C to +70°C for MAX708SCUA | Required for extended-temperature deployments (e.g., outdoor smart meters, factory-floor HMI) | Select MAX708SEUA when ambient operating temperature exceeds +70°C or requires MIL-STD-883 screening |
| TPS3808G33DBVR | Single active-low reset output; 3.3V fixed threshold; no PFO/PFI; 350ms reset timeout; 1.6µA quiescent current | Lacks dual-reset capability and power-fail warning; optimized for ultra-low-power, single-rail applications | Choose TPS3808G33DBVR only if dual reset and PFI functionality are unnecessary and sub-µA quiescent current is mandatory |
Compared with MAX708SEUA, MAX708SCUA trades extended temperature rating for lower cost and qualification scope; compared with TPS3808G33DBVR, it provides essential dual-output flexibility and system-level fault signaling at higher quiescent current-making it irreplaceable in designs requiring coordinated reset of multiple logic families or predictive power-fail response.
Availability
MAX708SCUA is available at Aetrix Electronics and suitable for portable medical monitors, battery-powered data loggers, industrial handheld terminals, and smart meters requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX708SCUA 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) designs precision analog and mixed-signal ICs for power, sensing, and connectivity applications, with emphasis on high-reliability industrial and automotive markets.
The MAX708 family delivers cost-optimized, feature-rich µP supervisory circuits targeting battery-powered and space-constrained embedded systems where dual-reset signaling and power-fail warning are critical for data integrity.
FAQ
What is the reset threshold voltage for MAX708SCUA?
The MAX708SCUA has a precision reset threshold of 2.93V (VCC falling), with ±1% tolerance over temperature. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The threshold ensures reliable reset assertion before a +3.3V microprocessor enters unstable operation during brownout conditions, and is explicitly documented in the Electrical Characteristics table of the MAX708SCUA datasheet.
Does MAX708SCUA include a watchdog timer function?
No, the MAX708SCUA does not include a watchdog timer. Unlike the MAX706/706A series, the MAX708 family omits the WDI/WDO pins and associated timing circuitry. Instead, MAX708SCUA provides both active-high (RESET) and active-low (RESET) reset outputs, along with the PFI/PFO power-fail comparator-making it ideal for applications requiring dual-reset signaling without software supervision overhead.
What package type is used for MAX708SCUA?
The MAX708SCUA is supplied in an 8-pin µMAX package (package code U8-1), measuring 3mm × 3mm with an exposed thermal pad. This surface-mount outline is distinct from SO-8 and PDIP packages and requires specific PCB land patterns and reflow profiles. The µMAX package is explicitly listed in the Ordering Information table for MAX708SCUA and confirmed in the Pin Configurations section of the datasheet.
Can MAX708SCUA operate with a 1.2V supply?
Yes, the MAX708SCUA is fully specified to operate down to VCC = 1.2V, and its RESET output is guaranteed to assert (go low) for VCC ≥ 1V. This capability enables reliable reset generation even during deep brownout events in battery-powered systems. The 100µA quiescent current at 3.3V scales downward at lower voltages, supporting ultra-low-power operation without sacrificing reset validity.
How does the PFI/PFO function work in MAX708SCUA?
In the MAX708SCUA, the PFI pin connects to an internal 1.25V comparator reference. When the voltage at PFI falls below 1.25V, the open-drain PFO output pulls low-signaling impending power failure. Users configure the trip point using an external resistive divider from an unregulated supply (e.g., battery or DC-DC input). This allows predictive shutdown or data save operations before the main +3.3V rail collapses, and is a core feature confirmed across all MAX708R/S/T variants including MAX708SCUA.
MAX708SCUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX708SCUA FAQ
1.How can I place an order for MAX708SCUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SCUA 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 MAX708SCUA reliable?
The price and inventory of MAX708SCUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SCUA is usually 5 days.
3.What payment methods are accepted for MAX708SCUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SCUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SCUA?
MAX708SCUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SCUA 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 MAX708SCUA?
For technical support, including MAX708SCUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SCUA requirements.
6.How does Aetrix verify that MAX708SCUA is sourced from the original manufacturer or authorized distributors?
All MAX708SCUA 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 MAX708SCUA meets industry standards.
7.What is the process for return or replacement of MAX708SCUA?
All MAX708SCUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SCUA, 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 MAX708SCUA part is unused and in its original packaging.
Return procedure for MAX708SCUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX708SCUA Tags
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MIC826SYMT-TR
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APX803L20-29SA-7
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