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Analog Devices Inc./Maxim Integrated MAX708REUA+T
- Part No.:
- MAX708REUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708REUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,171
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Product details
Overview
MAX708REUA+T from Maxim Integrated is a +3V microprocessor supervisory circuit in an 8-pin µMAX package, providing active-low RESET and active-high RESET outputs, 2.63V reset threshold, 200ms reset pulse width, and 1.25V power-fail comparator input-designed for reliable power-up/brownout monitoring in battery-powered portable instruments and industrial controllers.
For engineers reviewing the MAX708REUA+T datasheet, MAX708REUA+T pinout, MAX708REUA+T application, or MAX708REUA+T equivalent, this device delivers dual-reset signaling, low-quiescent-current supervision (100µA), guaranteed RESET assertion down to VCC = 1V, and precise voltage monitoring for embedded systems requiring deterministic reset behavior under varying supply conditions.
Technical Context
The MAX708REUA+T integrates a precision reset generator with hysteresis (20mV), dual complementary reset outputs (RESET and RESET), and a dedicated 1.25V reference-based power-fail comparator (PFI/PFO). It operates across VCC = 1.2V to 5.5V and asserts reset when VCC falls below 2.63V (R-suffix variant) or rises above it after power-up delay.
Unlike MAX706 variants, the MAX708 family omits the watchdog timer but adds simultaneous active-high and active-low reset signals-enabling direct interface to µPs with either reset polarity requirement without external inverters. The PFI input supports externally adjustable trip points via resistive dividers for early-warning power-fail detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset assertion before µP brownout in +3V systems |
| Reset Pulse Width | 200ms typical; guarantees sufficient hold time for µP initialization and peripheral stabilization |
| Supply Current | 100µA max at VCC < 3.6V; enables long battery life in portable equipment |
| Power-Fail Threshold | 1.25V internal reference; allows configurable undervoltage warning via external resistor divider on PFI |
| Operating Voltage Range | 1.2V to 5.5V; supports operation during deep brownout and compatibility with both +3V and +5V µP rails |
| Reset Output Drive | RESET sinks 1.2mA @ 0.3V; RESET sources 500µA @ 0.8×VCC; meets TTL/CMOS load requirements |
| Guaranteed Reset Assertion | Valid down to VCC = 1V; ensures deterministic reset state even during severe supply collapse |
Pinout & Package
MAX708REUA+T is housed in an 8-pin µMAX package (U8-1), measuring 3.0mm × 3.0mm × 0.8mm, with exposed pad for thermal enhancement and lead-free finish compliant with RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-Low Manual Reset Input | Debounced TTL/CMOS-compatible input; pulling low triggers 200ms reset pulse on both outputs |
| 2 (VCC) | Positive Supply Input | Primary power rail (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 for noise immunity |
| 4 (PFI) | Power-Fail Comparator Input | High-impedance (±25nA) input referenced to 1.25V; used with external divider to monitor auxiliary supplies |
| 5 (PFO) | Active-Low Power-Fail Output | Open-drain output asserting low when PFI < 1.25V; can interrupt µP or trigger backup sequencing |
| 6 (N.C.) | No Connection | Not internally bonded; must remain unconnected per datasheet to avoid parasitic coupling |
| 7 (RESET) | Active-Low Reset Output | Complementary to RESET; drives µP reset pin directly where active-low logic is required |
| 8 (RESET) | Active-High Reset Output | Complementary to RESET; interfaces natively with µPs requiring active-high reset assertion |
Key Features
| Feature | Design Value |
|---|---|
| Dual Complementary Reset Outputs | Simultaneous RESET (active-low) and RESET (active-high) eliminate need for external inverters in mixed-polarity systems |
| Precision 2.63V Reset Threshold | Tight tolerance (±1.5%) and 20mV hysteresis prevent chatter during slow-rising/falling VCC transitions |
| 1.25V Internal Reference for PFI | Enables accurate, temperature-stable power-fail detection of secondary rails (e.g., +12V, -5V) using simple resistor networks |
| 200ms Guaranteed Reset Pulse Width | Ensures µP and peripherals fully initialize before release-even under marginal VCC ramp rates |
| 100µA Quiescent Current | Minimizes standby drain in battery-backed applications such as portable medical devices and handheld test gear |
| Operation Down to VCC = 1V | Guarantees valid reset state during deep brownout, supporting fail-safe shutdown in critical embedded control |
Applications
| Battery-Powered Portable Instruments | Industrial Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell with AC adapter fallback. IC Role / Device Role / Timing Role: Supervises main +3.3V rail and monitors unregulated DC input via PFI to initiate graceful shutdown before battery depletion. Use Value: Prevents data corruption and flash memory write errors during low-battery cutoff using dual-reset signaling and 1.25V PFI reference. |
Use Scenario: PLC I/O module operating in factory environment with noisy 24VDC supply. IC Role / Device Role / Timing Role: Monitors local +3.3V logic rail and provides synchronized active-high and active-low reset to FPGA and MCU subsystems. Use Value: Eliminates timing skew between co-located processors by delivering identical 200ms reset pulses with matched propagation delay. |
| Computers & Embedded Systems | Critical µP Power Monitoring |
Use Scenario: Compact fanless industrial PC with dual-voltage design (+3.3V core, +5V I/O). IC Role / Device Role / Timing Role: Generates clean reset on both supply domains using PFI to detect pre-regulator failure before main rail collapse. Use Value: Enables early power-fail warning via PFO interrupt, allowing OS-level save operations before forced reset. |
Use Scenario: Medical infusion pump requiring fail-safe reset under battery/switchover transients. IC Role / Device Role / Timing Role: Provides guaranteed RESET assertion to VCC = 1V and dual-output redundancy for safety-critical reset path validation. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring deterministic reset behavior during worst-case brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SEUA+ | 3.08V reset threshold (vs. 2.63V); otherwise identical pinout, features, and timing | Suitable for +3.3V systems where higher reset threshold prevents spurious resets during nominal ripple | Select MAX708SEUA+ when system VCC nominal is ≥3.15V and tighter margin above 3.08V is required |
| MAX708TEUA+ | 3.08V reset threshold with extended temp range (–40°C to +85°C same as REUA+, but tighter initial accuracy) | Used in automotive body electronics where 3.08V threshold aligns with 3.3V LDO dropout behavior | Choose MAX708TEUA+ only if design requires 3.08V threshold and validated performance at temperature extremes beyond standard industrial spec |
Compared with MAX708REUA+, MAX708SEUA+ raises reset threshold by 450mV-reducing false triggers in noisy +3.3V environments-while MAX708TEUA+ offers identical electrical specs but targets applications needing tighter initial threshold tolerance at high temperature.
Availability
MAX708REUA+T is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, industrial controllers, and critical µP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for MAX708REUA+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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX708 series belongs to Maxim's microprocessor supervisory product line, engineered specifically to replace discrete reset circuits in space-constrained, low-power embedded systems requiring dual-polarity reset signaling and robust brownout protection.
FAQ
What is the reset threshold voltage of the MAX708REUA+T?
The MAX708REUA+T has a fixed reset threshold of 2.63V (VCC falling), with ±1.5% tolerance and 20mV hysteresis. This value is laser-trimmed at wafer test and guaranteed over the full –40°C to +85°C operating temperature range. The R-suffix designation explicitly identifies this 2.63V variant within the MAX708 family, and the threshold remains stable across VCC = 1.2V to 5.5V operation.
Does the MAX708REUA+T include a watchdog timer function?
No, the MAX708REUA+T does not include a watchdog timer. It is functionally distinct from the MAX706 series: the MAX708 family replaces the WDI/WDO pins with dual complementary reset outputs (RESET and RESET). The absence of watchdog circuitry simplifies design in applications where system-level supervision is handled externally or where deterministic reset timing-not activity monitoring-is the primary requirement.
How do the RESET and RESET outputs behave during power-up?
On power-up, once VCC reaches 1V, RESET is guaranteed logic-low and RESET is guaranteed logic-high. Both outputs remain asserted until VCC exceeds 2.63V, then deassert after a 200ms internal timer delay. During brownout (VCC < 2.63V), both outputs reassert immediately and stay asserted as long as VCC remains below threshold-ensuring no race condition between supply collapse and reset activation in the MAX708REUA+T.
Can the MAX708REUA+T monitor a negative supply voltage?
Yes, the MAX708REUA+T's PFI input can monitor negative voltages using the circuit shown in Figure 8 of the datasheet: a resistive divider references PFI to ground while the negative rail connects through R1/R2. When the negative supply drops, PFO goes high-providing fail indication. Accuracy depends on PFI threshold tolerance (±50mV), VCC stability, and resistor matching, but the MAX708REUA+T itself requires only a valid +1.2V to +5.5V VCC to operate.
What is the purpose of the N.C. pin on the MAX708REUA+T?
Pin 6 of the MAX708REUA+T is designated N.C. (No Connection) and is not internally bonded. It must remain unconnected in PCB layout-neither tied to GND, VCC, nor left floating-to prevent parasitic coupling, noise injection, or potential damage from ESD discharge paths. This pin position corresponds to WDI in MAX706 variants, but the MAX708REUA+T lacks watchdog functionality entirely.
MAX708REUA+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:
- 2.63V
- 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
MAX708REUA+T FAQ
1.How can I place an order for MAX708REUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708REUA+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 MAX708REUA+T reliable?
The price and inventory of MAX708REUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708REUA+T is usually 5 days.
3.What payment methods are accepted for MAX708REUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708REUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708REUA+T?
MAX708REUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708REUA+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 MAX708REUA+T?
For technical support, including MAX708REUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708REUA+T requirements.
6.How does Aetrix verify that MAX708REUA+T is sourced from the original manufacturer or authorized distributors?
All MAX708REUA+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 MAX708REUA+T meets industry standards.
7.What is the process for return or replacement of MAX708REUA+T?
All MAX708REUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708REUA+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 MAX708REUA+T part is unused and in its original packaging.
Return procedure for MAX708REUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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