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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 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:116
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Product details
Overview
MAX708SCUA+ from Maxim Integrated is a +3V microprocessor supervisory circuit with active-high and active-low reset outputs, 2.93V reset threshold, 200ms reset pulse width, 100µA quiescent current, and 1.25V power-fail comparator input-designed for reliable power monitoring in portable instruments and battery-powered controllers.
For engineers reviewing the MAX708SCUA+ datasheet, MAX708SCUA+ pinout, MAX708SCUA+ application, or MAX708SCUA+ equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing behavior, validated supply-voltage monitoring specs, and real-world alternative part comparisons for embedded system design and BOM optimization.
Technical Context
The MAX708SCUA+ integrates dual-reset generation (RESET and RESET), precision voltage monitoring at 2.93V ±1.5%, and a dedicated 1.25V reference comparator for power-fail or low-battery warning. It operates across VCC = 1.2V to 5.5V and guarantees RESET assertion down to VCC = 1V.
Unlike MAX706 variants, the MAX708SCUA+ omits the watchdog timer but provides both active-high and active-low reset signals on separate pins-enabling direct interface with µPs requiring either polarity without external inversion logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - precisely matches +3.3V system rails; triggers reset before brownout-induced µP malfunction |
| Reset Pulse Width | 200ms typical - ensures sufficient hold time for full µP initialization and peripheral stabilization |
| Supply Current | 100µA max at VCC < 3.6V - enables long battery life in portable equipment |
| Power-Fail Comparator Threshold | 1.25V internal reference - supports configurable early-warning detection via external resistor divider |
| Operating Voltage Range | 1.2V to 5.5V - functions during deep brownout and across mixed +3V/+5V supply environments |
| Reset Output Polarity | Both active-high (RESET) and active-low (RESET) - eliminates need for external inverters in dual-interface systems |
| Guaranteed Reset Assertion | Down to VCC = 1V - maintains system safety even during severe undervoltage conditions |
Pinout & Package
MAX708SCUA+ uses an 8-pin µMAX® package (U8-1), 3mm × 3mm, exposed pad, surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA source; debounced by ≥200ms reset pulse |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; powers all internal comparators, timers, and output drivers |
| 3 (GND) | Ground reference | Common return for all analog and digital circuitry; must be low-impedance for noise immunity |
| 4 (PFI) | Power-fail comparator input | Connects to resistive divider; asserts PFO when voltage falls below 1.25V reference |
| 5 (PFO) | Active-low power-fail output | Open-drain output; sinks current when PFI < 1.25V; used for µP interrupt or MR triggering |
| 6 (RESET) | Active-low reset output | Push-pull driver; asserted low during power-up, brownout, or MR activation; held for 200ms |
| 7 (RESET) | Active-high reset output | Push-pull driver; asserted high under same conditions as RESET; complementary signal for mixed-logic systems |
| 8 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet; no routing or termination required |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate external level-shifting components |
| Precision 2.93V reset threshold | ±1.5% tolerance over temperature ensures robust +3.3V rail monitoring without margining overhead |
| 1.25V internal reference comparator | Enables accurate, low-leakage (<25nA) power-fail or battery-low detection independent of VCC |
| 200ms factory-trimmed reset timeout | Guaranteed minimum delay prevents premature µP release; no external capacitor required |
| 100µA supply current at 3.3V | Reduces standby power in always-on portable devices; extends battery runtime significantly |
Applications
| Battery-Powered Equipment | Portable Instruments |
|---|---|
Use Scenario: Handheld multimeter powered by two AA alkaline cells with DC-DC regulation to +3.3V. IC Role / Device Role / Timing Role: Supervisory IC monitors regulated +3.3V rail and unregulated battery voltage via PFI divider; asserts dual reset signals during startup and low-battery shutdown. Use Value: Prevents firmware corruption during battery sag; enables graceful shutdown sequence triggered by PFO → MR path before cutoff. |
Use Scenario: Portable gas analyzer with ARM Cortex-M0 µP, OLED display, and sensor interface. IC Role / Device Role / Timing Role: Provides synchronized active-high and active-low reset to µP and display controller; monitors main supply and backup coin-cell via PFI. Use Value: Eliminates need for discrete inverters or dual supervisors; reduces PCB area and BOM count while ensuring deterministic boot timing. |
| Computers | Intelligent Instruments |
Use Scenario: Industrial PC/104 module with +3.3V core and +5V I/O rails, operating in wide-temperature environments. IC Role / Device Role / Timing Role: Primary supervisor for +3.3V domain; RESET drives µP, RESET drives FPGA configuration logic; PFO monitors +5V rail via divider. Use Value: Guarantees simultaneous, polarity-matched reset assertion across heterogeneous logic families; supports cold-start reliability down to -40°C. |
Use Scenario: Smart flow meter with isolated RS-485 interface, EEPROM logging, and lithium-thionyl chloride primary battery. IC Role / Device Role / Timing Role: Monitors battery voltage decay via PFI; generates reset pulse on MR during wake-up; holds µP in reset until stable clock and supply are confirmed. Use Value: Enables ultra-low-power sleep mode with sub-µA system leakage; ensures EEPROM write integrity during brownout recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TCUA+ | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, features, and timing | Suitable for +3.3V systems with tighter upper voltage margin or higher dropout tolerance | Select when system VCC nominal is >3.2V or brownout threshold must be elevated to avoid nuisance resets |
| TPS3808G33DBVR | Single active-low reset; 3.08V threshold; 2% accuracy; 25µA IQ; requires external pullup for active-high emulation | Lacks dual-reset outputs and integrated PFI comparator; optimized for ultra-low-power TI ecosystem designs | Choose for cost-sensitive, single-rail applications where dual reset polarity is unnecessary and layout space is constrained |
Compared with MAX708TCUA+, the MAX708SCUA+ offers lower reset threshold for earlier brownout response in +3.3V systems; compared with TPS3808G33DBVR, it delivers native dual-reset capability and integrated power-fail monitoring-reducing component count and improving system-level reliability without external support circuitry.
Availability
MAX708SCUA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and intelligent instrumentation requiring stable component supply across industrial temperature ranges and long production lifecycles.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX708 family was designed specifically for cost-sensitive, space-constrained embedded systems needing robust, dual-polarity µP supervision with integrated power-fail detection-targeting portable, battery-operated, and industrial control applications.
FAQ
What is the reset threshold voltage of the MAX708SCUA+?
The MAX708SCUA+ has a factory-trimmed reset threshold of 2.93V ±1.5%, specified over the full operating temperature range. This value is fixed for the 'S' variant and applies to both RESET and RESET outputs. The threshold is guaranteed to assert reset before the +3.3V supply drops to a level that risks µP instability or data corruption.
Does the MAX708SCUA+ include a watchdog timer function?
No, the MAX708SCUA+ does not include a watchdog timer. It belongs to the MAX708 series, which replaces the watchdog input/output (WDI/WDO) of the MAX706 family with dual reset outputs (RESET and RESET). If watchdog functionality is required, the MAX706SCUA+ or MAX706ASCUA+ should be considered instead.
What is the purpose of the PFI and PFO pins on the MAX708SCUA+?
The PFI (Power-Fail Input) pin connects to an external resistive divider to monitor a secondary voltage rail (e.g., unregulated battery or auxiliary supply). When the voltage at PFI falls below the internal 1.25V reference, the open-drain PFO (Power-Fail Output) pin pulls low. This allows the MAX708SCUA+ to trigger early-warning interrupts or initiate controlled shutdown sequences independent of the main VCC reset condition.
Can the MAX708SCUA+ operate with a supply voltage below 3.0V?
Yes, the MAX708SCUA+ is fully specified from VCC = 1.2V to 5.5V. It guarantees RESET assertion down to VCC = 1V and maintains valid logic levels on MR, PFI, and outputs across this range. This makes it suitable for deep brownout detection and battery-depleted operation in energy-harvesting or primary-cell applications.
What package type is used for the MAX708SCUA+?
The MAX708SCUA+ uses the 8-pin µMAX® package (U8-1), measuring 3mm × 3mm with an exposed thermal pad. It is a surface-mount, lead-free compatible package optimized for high-density PCB layouts. Pinout and mechanical dimensions conform to Maxim's standard µMAX outline, and the device is rated for operation from 0°C to +70°C.
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:
- 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, Push-Pull
- 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-uMAX/uSOP
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.
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