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Analog Devices Inc./Maxim Integrated MAX708SEUA+T
- Part No.:
- MAX708SEUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708SEUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
The MAX708SEUA+T from Maxim Integrated is a +3V microprocessor supervisory circuit with dual active-high and active-low reset outputs, 2.93V reset threshold, 200ms reset pulse width, and integrated power-fail comparator (1.25V reference). It monitors VCC in battery-powered embedded systems and asserts reset during power-up, brownout, or manual trigger events.
For engineers reviewing the MAX708SEUA+T datasheet, MAX708SEUA+T pinout, MAX708SEUA+T application, or MAX708SEUA+T equivalent, this device is selected for reliable µP reset generation in portable instruments, industrial controllers, and low-voltage computing platforms where dual-polarity reset signaling and supply voltage margining are required.
Technical Context
The MAX708SEUA+T implements a precision bandgap-based reset generator with hysteresis (20mV), guaranteed RESET assertion down to VCC = 1V, and independent power-fail detection via an open-collector PFO output referenced to a 1.25V internal comparator. Its dual-reset architecture (RESET and RESET) enables direct interface with µPs requiring either polarity without external inversion.
No watchdog timer is present-unlike MAX706 variants-making it suitable for applications where system-level supervision is handled externally. The 8-pin µMAX package supports surface-mount assembly with thermal derating of 4.5mW/°C above +70°C and operates across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (VCC falling); ensures reset assertion 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 operation down to 1.2V while maintaining reset assertion |
| Quiescent Current | 100µA max at VCC < 3.6V; enables long battery life in portable equipment |
| Power-Fail Threshold | 1.25V internal reference; allows configurable early-warning detection via external resistor divider |
| Operating Temperature | –40°C to +85°C; qualified for industrial-grade embedded deployment |
| Package | 8-pin µMAX (U8-1); 3mm × 3mm surface-mount footprint with exposed pad for thermal performance |
Pinout & Package
MAX708SEUA+T is housed in an 8-pin µMAX package (U8-1), a compact 3mm × 3mm surface-mount outline with exposed thermal pad. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise convention when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA current; 500ns minimum pulse width at 3V |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; bypass with 0.1µF capacitor recommended for noise immunity |
| 3 (GND) | Ground reference | System ground return; must be low-impedance for accurate threshold sensing |
| 4 (PFI) | Power-fail comparator input | Connects to resistive divider; triggers PFO when voltage falls below 1.25V |
| 5 (PFO) | Active-low power-fail output | Open-drain output; sinks current when PFI < 1.25V; used for NMI or MR assertion |
| 6 (RESET) | Active-low reset output | Asserted low during power-up/brownout/manual trigger; held for 200ms after recovery |
| 7 (N.C.) | No connection | Not internally bonded; leave unconnected; no electrical function |
| 8 (RESET) | Active-high reset output | Complementary to RESET; high during fault conditions; deasserts 200ms after recovery |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-logic systems |
| Guaranteed reset to VCC = 1V | Ensures deterministic µP state retention even during deep brownout or battery sag |
| Configurable power-fail warning | 1.25V internal reference + external resistor network enables precise undervoltage detection on auxiliary rails |
| Debounced manual reset | 140ms minimum reset pulse width inherently filters mechanical switch bounce without external RC |
| Low quiescent current | 100µA max enables >10-year battery life in always-on monitoring applications |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by single 3.3V Li-ion cell with AC adapter backup. IC Role / Device Role / Timing Role: Supervises main supply rail and generates synchronized active-high and active-low reset pulses to ARM Cortex-M0 MCU and analog front-end ASIC. Use Value: Prevents erratic startup during battery insertion or adapter hot-swap; dual outputs avoid level-shifting components. |
Use Scenario: Programmable logic controller (PLC) module operating from 3.3V backplane with isolated I/O. IC Role / Device Role / Timing Role: Monitors 3.3V VCC and asserts both RESET and RESET to FPGA configuration logic and real-time OS supervisor core. Use Value: Ensures deterministic boot sequence across temperature extremes; 200ms delay accommodates FPGA configuration time. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
Use Scenario: Fanless edge compute node using 3.3V SoM with DDR3L memory and eMMC storage. IC Role / Device Role / Timing Role: Provides primary reset generation and power-fail warning signal routed to PMIC for graceful shutdown sequencing. Use Value: 1.25V PFI reference enables early detection of 5V auxiliary rail collapse before 3.3V regulation fails. |
Use Scenario: Medical infusion pump with safety-critical microcontroller requiring fail-safe reset behavior. IC Role / Device Role / Timing Role: Acts as hardware-enforced reset arbiter; guarantees reset assertion during any VCC dip ≥20mV hysteresis window. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic analog reset generation. |
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 | Suitable for 3.3V systems with tighter supply tolerance; less margin for 3.0V nominal rails | Select when system VCC nominal is ≥3.15V and brownout margin must exceed 85mV |
| MAX708REUA+ | 2.63V reset threshold (vs. 2.93V); same package, temperature range, and dual-reset functionality | Better suited for 2.8V–3.0V µP cores or legacy 3V-only designs with wider voltage tolerance | Choose for compatibility with older 3V logic families or when lower trip point improves noise immunity |
Compared with MAX708TEUA+ and MAX708REUA+, the MAX708SEUA+T offers optimal reset threshold alignment for modern 3.3V ±5% supplies, balancing brownout sensitivity and noise rejection without requiring layout changes or firmware adaptation.
Availability
MAX708SEUA+T is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, and embedded computing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX708SEUA+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 power, sensing, and connectivity in industrial, automotive, and communications systems.
The MAX708 family delivers cost-effective, highly integrated µP supervisory functions-including dual-reset outputs and power-fail detection-for space-constrained, low-power embedded applications.
FAQ
What is the reset threshold voltage of the MAX708SEUA+T?
The MAX708SEUA+T has a guaranteed reset threshold of 2.93V (VCC falling), with ±1.5% tolerance over temperature and supply variations. This value is factory-trimmed and specified in the Electrical Characteristics table under "Reset Threshold (VCC Falling)" for the 'S' suffix variant. The MAX708SEUA+T maintains this threshold across its full –40°C to +85°C operating range and supports reliable reset assertion for 3.3V systems experiencing brownout.
Does the MAX708SEUA+T include a watchdog timer function?
No, the MAX708SEUA+T does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family omits the WDI and WDO pins and associated timing circuitry. Instead, the MAX708SEUA+T provides both RESET (active-low) and RESET (active-high) outputs, making it ideal for applications where external watchdog supervision is implemented separately or not required.
What package type is used for the MAX708SEUA+T?
The MAX708SEUA+T uses the 8-pin µMAX package (package code U8-1), a 3mm × 3mm surface-mount outline with exposed thermal pad. It is lead-free, RoHS-compliant, and rated for operation from –40°C to +85°C. The µMAX package enables high-density PCB layouts while maintaining thermal performance comparable to SO-8, with a derating factor of 4.5mW/°C above +70°C.
How does the power-fail comparator work on the MAX708SEUA+T?
The MAX708SEUA+T's power-fail comparator uses an internal 1.25V reference connected to the inverting input. The non-inverting input (PFI pin) accepts an external voltage-typically from a resistive divider-to set a custom trip point. When PFI falls below 1.25V, the open-drain PFO output pulls low. This allows early-warning detection of auxiliary supply collapse (e.g., 5V rail) before the main 3.3V VCC drops below its 2.93V reset threshold.
Can the MAX708SEUA+T operate with a 1.8V supply?
No, the MAX708SEUA+T requires a minimum VCC of 1.2V to guarantee RESET assertion, but its reset threshold is fixed at 2.93V. Operating at 1.8V would prevent the device from ever asserting reset, as VCC never reaches the trip point. It is designed for 3V–3.3V systems (with 3.15V min for 'T' variants, 3.0V for 'S', 2.7V for 'R'), not sub-2.5V logic domains.
MAX708SEUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX708SEUA+T FAQ
1.How can I place an order for MAX708SEUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708SEUA+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 MAX708SEUA+T reliable?
The price and inventory of MAX708SEUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708SEUA+T is usually 5 days.
3.What payment methods are accepted for MAX708SEUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708SEUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708SEUA+T?
MAX708SEUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708SEUA+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 MAX708SEUA+T?
For technical support, including MAX708SEUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708SEUA+T requirements.
6.How does Aetrix verify that MAX708SEUA+T is sourced from the original manufacturer or authorized distributors?
All MAX708SEUA+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 MAX708SEUA+T meets industry standards.
7.What is the process for return or replacement of MAX708SEUA+T?
All MAX708SEUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708SEUA+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 MAX708SEUA+T part is unused and in its original packaging.
Return procedure for MAX708SEUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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