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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 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,288
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Product details
Overview
MAX708SEUA+ 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 power-fail comparator input (PFI) referenced to 1.25V - used for reliable power-up/power-down monitoring in battery-powered portable instruments and industrial controllers.
For engineers reviewing the MAX708SEUA+ datasheet, MAX708SEUA+ pinout, MAX708SEUA+ application, or MAX708SEUA+ equivalent, this device delivers dual-reset signaling, brownout immunity down to VCC = 1V, manual reset debouncing, and precise voltage supervision without external components - critical for embedded systems requiring deterministic reset behavior under variable supply conditions.
Technical Context
The MAX708SEUA+ integrates a precision voltage detector with 2.93V threshold (±1.5% tolerance), internal 200ms reset timer, and independent 1.25V reference for PFI-based power-fail warning. It asserts both RESET (active-high) and RESET (active-low) simultaneously during VCC undervoltage or MR assertion.
No watchdog timer is present - unlike MAX706 variants - simplifying timing-critical designs where watchdog supervision is unnecessary. The device operates across VCC = 1.2V to 5.5V and guarantees RESET assertion down to VCC = 1V, enabling robust operation during deep brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V ±1.5% - ensures reset activation before 3.3V µP supply violates minimum operating voltage |
| Reset Pulse Width | 200ms typical - provides sufficient time for µP initialization and peripheral stabilization |
| Supply Current | 100µA max at VCC = 5.5V - enables multi-year battery life in always-on portable equipment |
| PFI Reference Voltage | 1.25V ±10mV - allows accurate power-fail detection via external resistor divider on unregulated rails |
| Operating Voltage Range | 1.2V to 5.5V - supports operation during severe brownout and compatibility with 3V/5V systems |
| Reset Output Types | Active-high RESET and active-low RESET - eliminates need for external inverters in mixed-logic systems |
| Guaranteed Reset Assertion | Down to VCC = 1V - prevents spurious release during slow power-down or weak battery conditions |
Pinout & Package
MAX708SEUA+ is housed in an 8-pin µMAX® package (U8-1), 3mm × 3mm, exposed pad, thin-profile surface-mount package rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA source; 500ns min pulse width at 3V |
| 2 (VCC) | Positive supply input | Accepts 1.2V–5.5V; bypassing with 0.1µF capacitor to GND recommended for noise immunity |
| 3 (GND) | Ground reference | Common return for all internal circuits and output sinks |
| 4 (PFI) | Power-fail comparator input | Compares against internal 1.25V reference; connects to resistive divider for custom trip point |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; used to trigger µP interrupt or initiate graceful shutdown |
| 6 (RESET) | Active-low reset output | Asserted low during VCC < 2.93V or MR low; remains low for 200ms after recovery |
| 7 (RESET) | Active-high reset output | Complementary to RESET; high during fault, low during normal operation |
| 8 (NC) | No connection | Not internally bonded; must be left floating or tied to GND per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reset signaling | Simultaneous active-high and active-low reset outputs eliminate level-shifting or inversion logic |
| Precision 2.93V threshold | ±1.5% accuracy over temperature ensures consistent µP reset across -40°C to +85°C |
| 1.25V PFI reference | Enables accurate monitoring of auxiliary supplies (e.g., 12V, -5V) using external resistor networks |
| 200ms reset timeout | Guaranteed minimum pulse width meets µP tRST requirements without external RC timing |
| Low 100µA quiescent current | Minimizes standby power draw in battery-backed systems such as handheld test equipment |
| VCC = 1V reset guarantee | Ensures deterministic reset hold until supply collapses fully - critical for data retention and state integrity |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers with Dual-Logic Interfaces |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell with 3.3V LDO and µC requiring clean reset during charge/discharge cycles. IC Role / Device Role / Timing Role: Supervises 3.3V rail and generates synchronized active-high and active-low reset pulses to ARM Cortex-M0 and FPGA configuration logic. Use Value: Prevents firmware corruption during battery sag below 3.0V while enabling direct interface to both 3.3V CMOS and 5V TTL peripherals. |
Use Scenario: PLC I/O module with mixed-voltage backplane (3.3V logic, 5V I/O drivers) requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Monitors main 3.3V supply and asserts RESET to µP and RESET to isolated gate drivers simultaneously. Use Value: Eliminates timing skew between processor and power-stage reset, preventing latch-up or undefined I/O states during power cycling. |
| Critical µP Power Monitoring in Medical Devices | Computers and Embedded Systems with Legacy Bus Support |
Use Scenario: Portable ECG monitor with flash memory storage and real-time DSP, where unexpected reset could lose patient waveform data. IC Role / Device Role / Timing Role: Provides fail-safe reset initiation and PFO-triggered NMI to initiate non-interruptible save-to-EEPROM routine before power loss. Use Value: Guarantees µP remains held in reset until VCC rises above 2.93V and sustains for 200ms - ensuring stable clock and memory initialization. |
Use Scenario: Industrial PC motherboard supporting both modern PCIe and legacy ISA expansion slots with differing reset timing requirements. IC Role / Device Role / Timing Role: Generates long-duration reset pulse (200ms) compatible with ISA timing while providing fast-release active-high signal for PCIe enumeration. Use Value: Satisfies JEDEC JESD22-B103B reset duration spec for legacy peripherals and PCIe Base Spec 3.0 tRST requirements concurrently. |
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, features, and timing | Suitable for 3.3V systems with tighter VCC margin; less tolerant of 3.0V brownout | Select when system nominal supply is ≥3.15V and brownout headroom is >70mV |
| MAX708REUA+ | 2.63V reset threshold (vs. 2.93V); same package, temperature range, and dual-reset architecture | Better suited for 3.0V-only systems or designs requiring earlier reset assertion during gradual discharge | Choose for battery-powered devices with LiFePO₄ cells or wide-input DC-DC converters with lower dropout |
Compared with MAX708TEUA+ and MAX708REUA+, the MAX708SEUA+ offers optimal reset threshold alignment for standard 3.3V ±5% supplies - balancing early fault detection against false triggering during transient dips, while maintaining full functional and mechanical compatibility across the MAX708 family.
Availability
MAX708SEUA+ is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, industrial controllers, and medical monitoring devices requiring stable component supply across extended temperature ranges and long production lifecycles.
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 analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX708 series belongs to Maxim's microprocessor supervisory product line, designed specifically to replace discrete reset solutions in space-constrained, low-power embedded systems requiring guaranteed reset behavior across voltage and temperature extremes.
FAQ
What is the reset threshold voltage of the MAX708SEUA+?
The MAX708SEUA+ has a factory-trimmed reset threshold of 2.93V with ±1.5% tolerance over temperature. This value is specified for VCC falling conditions and ensures reliable reset assertion before a 3.3V microprocessor violates its minimum supply requirement. The threshold is internally generated and does not require external calibration.
Does the MAX708SEUA+ include a watchdog timer function?
No, the MAX708SEUA+ does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family omits the WDI/WDO pins and associated timing circuitry, providing only voltage supervision and dual-reset outputs. This simplifies design for applications where software-level watchdog supervision is handled separately.
How does the MAX708SEUA+ handle power-fail detection?
The MAX708SEUA+ uses its PFI pin, which compares an external voltage (via resistor divider) against an internal 1.25V reference. When PFI falls below 1.25V, the PFO output goes low - enabling early warning of supply collapse. PFO can drive an interrupt line or be connected to MR to generate a controlled reset prior to full VCC failure.
What is the purpose of the NC pin on the MAX708SEUA+?
Pin 8 of the MAX708SEUA+ is labeled NC (No Connection) and is not internally bonded. It must be left floating or connected to GND per PCB layout guidelines to avoid parasitic coupling. This pin is reserved for future device variants and has no electrical function in the MAX708SEUA+.
Can the MAX708SEUA+ operate with a 1.8V supply?
No, the MAX708SEUA+ requires a minimum VCC of 1.2V to guarantee RESET assertion, but its reset threshold is fixed at 2.93V. With a 1.8V supply, VCC never reaches the reset threshold, so the device remains continuously in reset - making it unsuitable for 1.8V core logic. It is intended for 3V/3.3V or 5V systems.
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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
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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