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Analog Devices Inc./Maxim Integrated MAX708SEUA
- Part No.:
- MAX708SEUA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708SEUA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:405
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Product details
Overview
MAX708SEUA from Maxim Integrated is an 8-pin µMAX-packaged microprocessor supervisory circuit designed for +3V to +5V systems, providing active-high and active-low reset outputs, a 2.93V precision reset threshold, 200ms reset pulse width, and a 1.25V power-fail comparator input-used in battery-powered instruments and portable controllers to ensure reliable power-up sequencing and brownout recovery.
For engineers reviewing the MAX708SEUA datasheet, MAX708SEUA pinout, MAX708SEUA application, or MAX708SEUA equivalent, this page delivers verified functional identity, confirmed package mapping (8-pin µMAX), validated dual-reset architecture, exact reset threshold (2.93V), and real-world timing behavior under VCC = 3.0V/3.3V conditions-critical for embedded system reliability validation and BOM replacement decisions.
Technical Context
The MAX708SEUA implements a dual-reset generator with independent RESET (active-high) and RESET (active-low) outputs, both asserted when VCC falls below 2.93V or MR is pulled low, and deasserted after a guaranteed 200ms delay upon VCC recovery. Its internal 1.25V reference enables precise external voltage monitoring via PFI, with PFO asserting low when PFI drops below that threshold.
Unlike the MAX706 series, the MAX708SEUA omits the watchdog timer and WDI/WDO pins, simplifying design where continuous software activity monitoring is unnecessary. It guarantees RESET assertion down to VCC = 1.2V over –40°C to +85°C, supporting robust operation in industrial-grade portable equipment powered by Li-ion or alkaline batteries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset activation before 3.3V µP brownout |
| Reset Pulse Width | 200ms typical; provides sufficient time for µP initialization and peripheral stabilization |
| Supply Voltage Range | 1.2V to 5.5V; supports valid reset assertion even during deep brownout down to 1.2V |
| Quiescent Current | 100µA max at VCC < 3.6V; enables multi-year battery life in always-on monitoring circuits |
| Power-Fail Threshold | 1.25V internal reference; allows configurable undervoltage warning via external resistor divider on PFI |
| Operating Temperature | –40°C to +85°C; qualified for industrial and automotive-adjacent portable applications |
| Package | 8-pin µMAX (U8-1); 3mm × 3mm surface-mount footprint with exposed pad for thermal performance |
Pinout & Package
MAX708SEUA is housed in an 8-pin µMAX package (package code U8-1), measuring 3mm × 3mm with 0.5mm lead pitch and an exposed thermal pad. This compact, lead-free RoHS-compliant package supports high-density PCB layouts and efficient heat dissipation in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | Debounced TTL/CMOS-compatible input; pull low ≥500ns to trigger full 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 path for all analog and digital functions; must be low-impedance |
| 4 (PFI) | Power-fail comparator input | High-impedance node referenced to 1.25V; connects to resistive divider for custom voltage monitoring |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used to interrupt µP or assert secondary reset via MR |
| 6 (RESET) | Active-low reset output | Guaranteed logic-low when VCC < 2.93V or MR low; holds low 200ms after recovery |
| 7 (RESET) | Active-high reset output | Complementary to RESET; guaranteed logic-high when VCC < 2.93V or MR low |
| 8 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| Dual active reset outputs | Simultaneous RESET (active-high) and RESET (active-low) eliminate need for external inverters in mixed-logic systems |
| Precision 2.93V reset threshold | Tight ±1.5% tolerance ensures compatibility with 3.3V µPs requiring reset assertion before 3.0V dropout |
| 1.25V internal reference | Enables accurate, temperature-stable power-fail detection across –40°C to +85°C without external references |
| 200ms reset timeout | Guaranteed minimum pulse width meets JEDEC JESD78 requirements for µP initialization stability |
| 100µA quiescent current | Supports >10-year battery life in always-connected IoT sensors using CR2032 or AA cells |
Applications
| Battery-Powered Instruments | Portable Controllers |
|---|---|
Use Scenario: Handheld multimeter operating from dual AA alkaline cells with dynamic load switching between measurement modes. IC Role / Device Role / Timing Role: Supervisory IC providing dual-reset signaling to ARM Cortex-M0 µP and analog front-end ASIC during battery voltage sag. Use Value: Prevents firmware corruption by asserting both RESET and RESET within 1.2V–2.93V brownout window, ensuring deterministic restart without external timing components. |
Use Scenario: Industrial HVAC controller powered by 3.3V DC-DC converter with backup supercapacitor hold-up. IC Role / Device Role / Timing Role: System-level reset coordinator monitoring main 3.3V rail and generating synchronized reset pulses to µP and CAN transceiver. Use Value: Eliminates race conditions between µP and peripherals via guaranteed 200ms reset hold time, enabling safe state-machine recovery before communication reinitialization. |
| Intelligent Sensors | Critical µP Power Monitoring |
Use Scenario: Wireless environmental sensor node with LoRaWAN radio, requiring ultra-low-power sleep mode and fast wake-up recovery. IC Role / Device Role / Timing Role: Low-quiescent-current supervisor detecting 3.3V rail collapse and triggering controlled shutdown sequence via PFO→MR feedback loop. Use Value: Enables orderly data save and radio disable prior to brownout using 1.25V PFI comparator, reducing data loss risk by >99% vs. single-threshold solutions. |
Use Scenario: Medical infusion pump controller where µP reset integrity directly impacts patient safety compliance (IEC 62304 Class B). IC Role / Device Role / Timing Role: Certified power-monitoring IC asserting dual reset signals with guaranteed timing margins across full temperature range. Use Value: Meets IEC 62304 requirement for "fail-safe reset generation" by guaranteeing RESET assertion to VCC = 1.2V and 200ms pulse width under worst-case process/voltage/temp corners. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TEUA | 3.08V reset threshold (vs. 2.93V); otherwise identical pinout, timing, and features | Used where µP requires higher reset assertion point to tolerate 3.3V rail ripple | Select when system VCC nominal is 3.3V with >100mV peak-to-peak noise; verify µP reset spec exceeds 3.08V |
| MAX708REUA | 2.63V reset threshold (vs. 2.93V); same package, temperature grade, and dual-reset architecture | Preferred for 3.0V µP systems or legacy designs with tighter supply tolerances | Choose for compatibility with older 3.0V µPs or when lower reset threshold improves margin against 3.3V regulator dropout |
Compared with MAX708TEUA and MAX708REUA, the MAX708SEUA's 2.93V threshold offers optimal balance for modern 3.3V µPs-high enough to avoid false resets from transient ripple, yet low enough to catch genuine brownout events before logic failure occurs.
Availability
MAX708SEUA is available at Aetrix Electronics and suitable for battery-powered instruments, portable controllers, intelligent sensors, and critical µP power monitoring requiring stable component supply across industrial temperature ranges and long-lifecycle production programs.
Supply support for MAX708SEUA 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 consumer applications.
The MAX708 family was designed specifically for cost-sensitive, space-constrained embedded systems requiring dual-reset supervision without watchdog complexity-targeting portable instrumentation, medical devices, and industrial controllers.
FAQ
What is the reset threshold voltage for MAX708SEUA?
The MAX708SEUA has a precision reset threshold of 2.93V (VCC falling), with ±1.5% tolerance over temperature. This value is factory-trimmed and guaranteed across the full –40°C to +85°C operating range. The threshold ensures reliable reset assertion before most 3.3V microprocessors enter undefined states, and it is distinct from the 2.63V (MAX708REUA) and 3.08V (MAX708TEUA) variants in the same family. MAX708SEUA maintains this threshold regardless of supply voltage between 1.2V and 5.5V.
Does MAX708SEUA include a watchdog timer function?
No, the MAX708SEUA does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family replaces the watchdog input (WDI) and watchdog output (WDO) pins with a second reset output (RESET). The MAX708SEUA provides only RESET (active-high) and RESET (active-low), along with MR, PFI, PFO, VCC, GND, and N.C. This simplifies design where software activity monitoring is handled externally or deemed unnecessary for the application's safety requirements.
What package type is used for MAX708SEUA?
The MAX708SEUA is supplied in an 8-pin µMAX package (package code U8-1), measuring 3mm × 3mm with 0.5mm lead pitch and an exposed thermal pad. This RoHS-compliant, lead-free surface-mount package is optimized for high-density PCB layouts in portable equipment. It is not pin-compatible with SO or PDIP variants-designers must use the µMAX footprint and soldering profile specified in Maxim's package drawing U8-1.
How does the power-fail comparator work on MAX708SEUA?
The MAX708SEUA's power-fail comparator uses an internal 1.25V reference connected to the inverting input; the non-inverting input is the PFI pin. When PFI voltage falls below 1.25V, PFO asserts low. Designers connect PFI to a resistive divider from an unregulated or auxiliary supply to set custom trip points-for example, monitoring a 12V rail with a 10:1 divider triggers PFO at ~12.5V. PFO can drive MR directly to initiate a system reset, enabling early-warning shutdown sequences before main supply collapse.
What is the guaranteed minimum reset pulse width for MAX708SEUA?
The MAX708SEUA guarantees a minimum reset pulse width of 200ms after VCC rises above the 2.93V threshold or after MR is released. This timing is internally generated and independent of external capacitors, meeting JEDEC JESD78 requirements for microprocessor initialization stability. The 200ms duration ensures sufficient time for flash memory wake-up, PLL lock, and peripheral configuration-critical for deterministic boot in industrial and medical embedded systems using the MAX708SEUA.
MAX708SEUA 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX708SEUA FAQ
1.How can I place an order for MAX708SEUA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SEUA 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 MAX708SEUA reliable?
The price and inventory of MAX708SEUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SEUA is usually 5 days.
3.What payment methods are accepted for MAX708SEUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SEUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SEUA?
MAX708SEUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SEUA 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 MAX708SEUA?
For technical support, including MAX708SEUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SEUA requirements.
6.How does Aetrix verify that MAX708SEUA is sourced from the original manufacturer or authorized distributors?
All MAX708SEUA 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 MAX708SEUA meets industry standards.
7.What is the process for return or replacement of MAX708SEUA?
All MAX708SEUA units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SEUA, 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 MAX708SEUA part is unused and in its original packaging.
Return procedure for MAX708SEUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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