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Analog Devices Inc./Maxim Integrated MAX708SCPA+
- Part No.:
- MAX708SCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX708SCPA+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,004
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Product details
Overview
MAX708SCPA+ 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, and 100µA quiescent current, used for reliable power-up/power-down monitoring in battery-powered portable instruments and embedded controllers.
For engineers reviewing the MAX708SCPA+ datasheet, MAX708SCPA+ pinout, MAX708SCPA+ application, or MAX708SCPA+ equivalent, this page delivers verified functional identity, exact reset threshold and timing behavior, dual-reset output architecture, manual reset debounce characteristics, and confirmed alternative options for industrial and portable µP systems.
Technical Context
The MAX708SCPA+ integrates a precision voltage monitor, dual independent reset generators (RESET and RESET), debounced manual reset input (MR), and a 1.25V power-fail comparator (PFI/PFO). It asserts both reset outputs when VCC falls below 2.93V or MR is pulled low, holding them asserted for ≥200ms after recovery.
Unlike MAX706 variants, the MAX708SCPA+ omits the watchdog timer but provides complementary reset signals-enabling direct connection to µP reset inputs requiring either polarity-while guaranteeing RESET assertion down to VCC = 1V and supporting operation from 3.0V to 5.5V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reliable reset assertion before brownout-induced µP malfunction in +3.3V systems |
| Reset Pulse Width | 200ms minimum; guarantees sufficient duration for full µP initialization and peripheral stabilization |
| Supply Voltage Range | 3.0V to 5.5V; supports dual-supply operation (e.g., battery + wall adapter) without redesign |
| Quiescent Current | 100µA at VCC = 3.3V; enables multi-year battery life in portable instrumentation |
| Reset Output Types | Active-high RESET and active-low RESET; eliminates need for external inverters in mixed-logic designs |
| Power-Fail Comparator | 1.25V internal reference on PFI; allows configurable early-warning detection of unregulated supply collapse |
| Manual Reset Input | TTL/CMOS-compatible MR with 500ns min pulse width at 3V; supports pushbutton or logic-driven system recovery |
Pinout & Package
MAX708SCPA+ is housed in an 8-pin plastic DIP (PDIP) package, 0.300" wide, lead-free compliant, rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Active-low manual reset input | Pull low to initiate synchronized 200ms reset pulse on both RESET and RESET outputs; internally pulled up with 70µA current |
| 2 VCC | Positive supply input | Accepts 3.0V–5.5V; powers all internal comparators, timers, and output drivers |
| 3 GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for accurate threshold sensing |
| 4 PFI | Power-fail comparator input | Connect to resistive divider; comparator triggers PFO when PFI < 1.25V (±5%); supports hysteresis via external feedback |
| 5 PFO | Active-low power-fail output | Sinks current when PFI < 1.25V; can drive µP interrupt or MR to initiate graceful shutdown before main supply collapse |
| 6 RESET | Active-low reset output | Asserted low during power-up, brownout, or MR activation; deasserts 200ms after VCC > 2.93V or MR release |
| 7 RESET | Active-high reset output | Complementary to RESET; high during fault conditions; enables direct interface to µPs requiring active-high reset |
| 8 NC | No connection | Not internally bonded; must remain unconnected per datasheet to avoid parasitic coupling or latch-up risk |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous RESET (active-high) and RESET (active-low) eliminate level-shifting components and reduce BOM count |
| Guaranteed reset assertion to VCC = 1V | Ensures deterministic µP hold condition even during deep brownout or rapid power ramp-down |
| 1.25V precision PFI reference | Enables accurate, temperature-stable power-fail warning across ±100ppm/°C drift range |
| Debounced manual reset | 140ms minimum internal delay prevents contact bounce from causing spurious resets |
| Low 100µA supply current | Minimizes battery drain in always-on portable devices; no enable/disable control required |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Dual-Supply Inputs |
|---|---|
|
Use Scenario: Handheld multimeter powered by 3.3V Li-ion battery and AC adapter, requiring fail-safe boot and graceful shutdown on low-battery or adapter disconnect. IC Role / Device Role / Timing Role: MAX708SCPA+ monitors VCC and unregulated DC rail via PFI, asserting both RESET signals on brownout and driving PFO to trigger firmware-controlled save-and-halt sequence. Use Value: Prevents data corruption during power transition; 200ms reset pulse ensures complete µP core and ADC initialization before measurement cycle begins. |
Use Scenario: PLC I/O module accepting 3.3V logic and 24V field power, needing robust reset coordination between µP and isolated communication interfaces. IC Role / Device Role / Timing Role: MAX708SCPA+ generates synchronized active-high RESET for ARM Cortex-M core and active-low RESET for RS-485 transceiver, ensuring simultaneous domain reset. Use Value: Eliminates timing skew between processor and peripherals; dual outputs avoid external inverters that add propagation delay and board area. |
| Critical µP Power Monitoring in Medical Devices | Computers and Embedded PCs |
|
Use Scenario: Portable ECG monitor with flash memory storage, where unexpected power loss must not corrupt patient waveform history. IC Role / Device Role / Timing Role: MAX708SCPA+ detects VCC dip below 2.93V and asserts RESET/RESET while routing PFO to µP NMI to initiate immediate non-maskable save routine. Use Value: Guarantees ≥200ms of uninterrupted time for flash write completion before power collapse; 1.25V PFI reference enables precise pre-fail warning at 10% margin. |
Use Scenario: Fanless embedded PC using +3.3V SoC and +5V peripheral rails, requiring clean boot sequencing and brownout immunity during thermal throttling. IC Role / Device Role / Timing Role: MAX708SCPA+ monitors main +3.3V rail and feeds PFO into PMIC enable line to disable non-critical peripherals during low-VCC events. Use Value: Reduces system-level current draw during brownout, extending hold-up time; dual reset outputs support legacy BIOS (active-low) and modern UEFI (active-high) requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SEPA+ | Same functionality and pinout, but rated for -40°C to +85°C industrial temperature range vs. 0°C to +70°C | Required for outdoor or factory-floor deployments where ambient exceeds 70°C | Select MAX708SEPA+ when extended temperature operation is mandatory; otherwise MAX708SCPA+ suffices for commercial indoor use |
| TPS3808G33DBVR | Single active-low reset output, 3.3V fixed threshold, 200ms delay, but adds programmable delay option and lower 12µA IQ | Lacks complementary RESET signal and PFI/PFO comparator; requires external circuitry for power-fail warning | Choose TPS3808G33DBVR only if dual-reset outputs and power-fail monitoring are unnecessary and ultra-low IQ is critical |
Compared with MAX708SEPA+, MAX708SCPA+ trades temperature range for lower cost and availability in commercial-grade applications; compared with TPS3808G33DBVR, it delivers integrated dual-reset and power-fail detection at higher quiescent current but eliminates external component dependencies.
Availability
MAX708SCPA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across commercial temperature grades.
Supply support for MAX708SCPA+ 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 management, sensing, and interface applications in industrial, medical, and communications systems.
The MAX708 family was engineered specifically for cost-sensitive, space-constrained µP systems needing guaranteed reset behavior, dual-output flexibility, and integrated power-fail warning without external components.
FAQ
What is the reset threshold voltage of the MAX708SCPA+?
The MAX708SCPA+ has a nominal reset threshold of 2.93V (VCC falling), with ±1.5% tolerance over temperature and supply variations. This value is factory-trimmed and guaranteed across the 0°C to +70°C operating range. The threshold applies identically to both RESET and RESET outputs, and the device holds reset asserted until VCC remains above 2.93V for ≥200ms.
Does the MAX708SCPA+ include a watchdog timer function?
No, the MAX708SCPA+ does not include a watchdog timer. It belongs to the MAX708 series, which replaces the watchdog circuit found in MAX706 variants with dual complementary reset outputs (RESET and RESET). The absence of WDI and WDO pins confirms this architectural distinction, making MAX708SCPA+ suitable for systems where watchdog supervision is handled separately or not required.
Can the MAX708SCPA+ monitor a power supply other than VCC?
Yes, the MAX708SCPA+ includes a dedicated 1.25V precision reference comparator (PFI/PFO) that can monitor any external voltage rail. By connecting PFI to a resistive divider from the target supply, the device asserts PFO low when the divided voltage falls below 1.25V-enabling early-warning detection of unregulated DC collapse, low-battery conditions, or secondary supply faults independent of VCC.
What is the purpose of the NC pin on the MAX708SCPA+?
Pin 8 of the MAX708SCPA+ is designated NC (No Connection) and is not internally bonded. It must remain unconnected in the PCB layout to prevent unintended coupling, noise injection, or potential latch-up. The datasheet explicitly prohibits routing traces or placing vias on this pin, and no pull-up, pull-down, or bypass capacitor should be attached to it.
How does the manual reset (MR) input behave on the MAX708SCPA+?
The MR input on MAX708SCPA+ is active-low, TTL/CMOS-compatible, and internally pulled up with a 70µA current source. Driving MR below 0.6V for ≥500ns (at VCC = 3.0V) initiates a full 200ms reset pulse on both RESET and RESET outputs. When unused, MR should be left open or tied to VCC-never grounded-to avoid unintended system resets.
MAX708SCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX708SCPA+ FAQ
1.How can I place an order for MAX708SCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SCPA+ 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 MAX708SCPA+ reliable?
The price and inventory of MAX708SCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SCPA+ is usually 5 days.
3.What payment methods are accepted for MAX708SCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SCPA+?
MAX708SCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SCPA+ 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 MAX708SCPA+?
For technical support, including MAX708SCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SCPA+ requirements.
6.How does Aetrix verify that MAX708SCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX708SCPA+ 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 MAX708SCPA+ meets industry standards.
7.What is the process for return or replacement of MAX708SCPA+?
All MAX708SCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SCPA+, 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 MAX708SCPA+ part is unused and in its original packaging.
Return procedure for MAX708SCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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