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Analog Devices Inc./Maxim Integrated MAX708SCSA+T
- Part No.:
- MAX708SCSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX708SCSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,091
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Product details
Overview
MAX708SCSA+T from Maxim Integrated is a +3V microprocessor supervisory circuit with active-low and active-high reset outputs, 2.93V reset threshold, 200ms reset pulse width, and 100µA quiescent current - used in portable instruments and battery-powered controllers to ensure reliable power-up/power-down sequencing.
For engineers reviewing the MAX708SCSA+T datasheet, MAX708SCSA+T pinout, MAX708SCSA+T application, or MAX708SCSA+T equivalent, this page delivers verified functional identity, exact reset threshold and timing behavior, dual-reset output configuration, manual reset debounce characteristics, and confirmed alternative options for industrial embedded systems requiring stable brownout detection and system-level reset coordination.
Technical Context
The MAX708SCSA+T integrates dual independent reset generators - one active-low (RESET), one active-high (RESET) - both asserted when VCC falls below 2.93V or MR is pulled low, with guaranteed assertion down to VCC = 1V and 200ms deassertion delay after recovery. It includes a precision 1.25V power-fail comparator (PFI/PFO) for early-warning voltage monitoring and supports debounced TTL/CMOS-compatible manual reset input.
Unlike MAX706 variants, the MAX708 family omits the watchdog timer and instead provides complementary reset outputs. The S-suffix denotes 2.93V reset threshold, and C-grade temperature range (0°C to +70°C) applies; the SCSA package code confirms 8-pin SO (SOIC-8) with lead-free finish.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset assertion before µP supply dropout in +3.3V systems |
| Reset Pulse Width | 200ms typical; guarantees sufficient time for µP initialization and peripheral stabilization |
| Supply Current | 100µA max at VCC < 3.6V; enables long battery life in portable instrumentation |
| Power-Fail Threshold | 1.25V internal reference; allows configurable early-warning detection via external resistor divider |
| Operating Voltage Range | 1.2V to 5.5V; supports valid reset assertion even during deep brownout (down to VCC = 1V) |
| Manual Reset Input | TTL/CMOS-compatible; 500ns minimum pulse width at VCC = 3V; internally pulled up with 70µA source |
| Output Drive | RESET sinks 1.2mA @ 0.3V; RESET sources 500µA @ 0.8×VCC; compatible with standard logic interfaces |
Pinout & Package
MAX708SCSA+T is housed in an 8-pin SO (SOIC-8) surface-mount package per package code SCSA, measuring 4.9mm × 3.9mm × 1.75mm, with gull-wing leads and RoHS-compliant lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Pull low to trigger 200ms reset pulse; internally pulled up with 70µA; TTL/CMOS compatible |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; reset guaranteed asserted down to VCC = 1V |
| 3 (GND) | Ground reference | Common return for all internal circuits and output drivers |
| 4 (PFI) | Power-fail comparator input | Connect to resistive divider; asserts PFO when voltage falls below 1.25V |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used for NMI or MR triggering on supply degradation |
| 6 (RESET) | Active-low reset output | Asserted low during power-up/brownout; remains low ≥200ms after VCC recovery |
| 7 (RESET) | Active-high reset output | Asserted high during power-up/brownout; complements RESET for mixed-logic systems |
| 8 (NC) | No connection | Not internally bonded; leave unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low (RESET) and active-high (RESET) signals eliminate need for external inverters in mixed-logic designs |
| Precision 2.93V reset threshold | Matches +3.3V µP supply tolerance; ±1.5% accuracy over temperature ensures robust brownout immunity |
| Guaranteed reset assertion to VCC = 1V | Ensures deterministic µP hold condition during deep undervoltage events, critical for data retention and safe shutdown |
| 1.25V precision power-fail comparator | Enables early warning of supply collapse via external resistor network; 10mV hysteresis prevents chatter near trip point |
| Debounced manual reset input | 70µA internal pull-up and 200ms reset timeout inherently suppress switch bounce without external RC components |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Dual-Logic Interfaces |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell with DC-DC converter regulating +3.3V rail. IC Role / Device Role / Timing Role: Supervises +3.3V supply, triggers reset on battery sag below 3.0V, and asserts PFO to initiate graceful ADC shutdown before cutoff. Use Value: Prevents corrupted measurements and flash write errors during low-battery operation using guaranteed 200ms reset hold and 1.25V PFI threshold. |
Use Scenario: PLC I/O module integrating +3.3V FPGA and +5V analog front-end, requiring synchronized reset across voltage domains. IC Role / Device Role / Timing Role: Generates simultaneous active-low RESET for FPGA and active-high RESET for analog supervisor ICs via shared VCC monitoring. Use Value: Eliminates need for discrete level-shifting or dual reset ICs, reducing BOM count and PCB area while ensuring correlated reset timing. |
| Computers with Redundant Power Monitoring | Critical µP Systems Requiring Fail-Safe State Hold |
Use Scenario: Embedded x86 controller board with primary +3.3V rail and backup +12V auxiliary supply, both monitored for graceful shutdown. IC Role / Device Role / Timing Role: Uses PFI divider to monitor +12V rail; PFO drives MR to force reset if +12V fails, while RESET/RESET coordinate main CPU and PMIC. Use Value: Enables cross-rail failure detection without additional comparators; 2.93V threshold aligns with ATX +3.3V spec limits. |
Use Scenario: Medical infusion pump MCU that must remain in known reset state during AC power interruption and battery switchover. IC Role / Device Role / Timing Role: Asserts both RESET and RESET outputs continuously while VCC drops from 3.3V to 1.0V, holding MCU in reset until stable power returns. Use Value: Meets IEC 62304 safety requirement for deterministic fail-safe behavior; guaranteed assertion to 1V prevents metastability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SESA+ | Same functionality and pinout, but extended -40°C to +85°C temperature range | Required for industrial outdoor or automotive under-hood deployments | Select MAX708SESA+ when operating ambient exceeds +70°C |
| TPS3808G33DBVR | Single active-low reset output, 3.3V threshold, 200ms delay, but no complementary RESET or PFI/PFO | Lacks power-fail warning and dual-reset capability; suitable only for basic reset-only use cases | Choose only if PFI monitoring and dual-reset outputs are unnecessary and footprint compatibility is secondary |
Compared with MAX708SESA+, the MAX708SCSA+T offers identical electrical behavior but is rated only for 0°C to +70°C operation; compared with TPS3808G33DBVR, it provides full dual-reset and power-fail comparator functionality essential for safety-critical brownout response, at the cost of higher pin count and legacy SOIC-8 footprint.
Availability
MAX708SCSA+T is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply with guaranteed long-term sourcing and consistent parametric performance.
Supply support for MAX708SCSA+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) designs precision analog and mixed-signal ICs for industrial, communications, and computing applications, with expertise in power management and supervisory circuits.
The MAX708 series was developed specifically for cost-sensitive +3V/+3.3V microprocessor systems needing dual-reset outputs and integrated power-fail warning - targeting portable instrumentation, controllers, and embedded computers where reliability and small footprint are critical.
FAQ
What is the reset threshold voltage of the MAX708SCSA+T?
The MAX708SCSA+T has a nominal reset threshold of 2.93V (VCC falling), with ±1.5% accuracy over temperature. This value is factory-trimmed and specified for operation across the full 0°C to +70°C range. The threshold ensures reliable reset assertion before most +3.3V microprocessors exit their valid operating window, and is distinct from the 1.25V internal reference used for the PFI comparator.
Does the MAX708SCSA+T include a watchdog timer function?
No, the MAX708SCSA+T does not include a watchdog timer. It belongs to the MAX708 family, which replaces the watchdog input/output (WDI/WDO) found in MAX706 variants with a second reset output (RESET). The MAX708SCSA+T provides only RESET (active-low) and RESET (active-high), along with PFI/PFO monitoring - making it suitable for applications requiring dual-reset coordination without software-driven timeout supervision.
What package type and dimensions does the MAX708SCSA+T use?
The MAX708SCSA+T uses an 8-pin SO (SOIC-8) package, identified by the "SCSA" suffix. Its outline conforms to JEDEC MS-012, with body dimensions of 4.9mm × 3.9mm × 1.75mm, gull-wing lead form, and lead-free (RoHS-compliant) finish. The package is pin-compatible with industry-standard SOIC-8 footprints and supports reflow soldering per J-STD-020.
Can the MAX708SCSA+T monitor a supply other than VCC using the PFI input?
Yes, the PFI input is fully independent of VCC and can monitor any DC voltage - including unregulated rails, negative supplies (via level-shifting), or battery voltages - by connecting it to a resistive divider. When the divided voltage falls below the internal 1.25V reference, PFO asserts low. This enables early-warning detection of auxiliary supply failure, such as +12V rail collapse in systems with multiple power domains.
Is the MAX708SCSA+T pin-compatible with other MAX708 variants like MAX708RCSA+ or MAX708TCUA?
Yes, all MAX708 variants - including MAX708RCSA+, MAX708SCSA+T, and MAX708TCUA - share identical pinout, package, and core functionality. The only differences are reset threshold voltage (2.63V, 2.93V, 3.08V) and temperature grade/package option. Therefore, MAX708SCSA+T is a direct replacement for any other MAX708 in SOIC-8 format where 2.93V threshold and commercial temperature range are required.
MAX708SCSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-SOIC
MAX708SCSA+T FAQ
1.How can I place an order for MAX708SCSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SCSA+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 MAX708SCSA+T reliable?
The price and inventory of MAX708SCSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SCSA+T is usually 5 days.
3.What payment methods are accepted for MAX708SCSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SCSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SCSA+T?
MAX708SCSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SCSA+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 MAX708SCSA+T?
For technical support, including MAX708SCSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SCSA+T requirements.
6.How does Aetrix verify that MAX708SCSA+T is sourced from the original manufacturer or authorized distributors?
All MAX708SCSA+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 MAX708SCSA+T meets industry standards.
7.What is the process for return or replacement of MAX708SCSA+T?
All MAX708SCSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SCSA+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 MAX708SCSA+T part is unused and in its original packaging.
Return procedure for MAX708SCSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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