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Analog Devices Inc./Maxim Integrated MAX708RCUA+T
- Part No.:
- MAX708RCUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708RCUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,868
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Product details
Overview
MAX708RCUA+T from Maxim Integrated is a +3V microprocessor supervisory circuit in 8-pin µMAX package, providing active-high and active-low reset outputs, 2.63V reset threshold, 200ms reset pulse width, and 1.25V power-fail comparator input-used for reliable power-up sequencing and brownout protection in battery-powered embedded controllers.
For engineers reviewing the MAX708RCUA+T datasheet, MAX708RCUA+T pinout, MAX708RCUA+T application, or MAX708RCUA+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing behavior, supply-voltage monitoring specs, and validated alternative options for industrial and portable µP systems.
Technical Context
The MAX708RCUA+T integrates dual-reset generation (RESET and RESET) with independent assertion timing, guaranteeing logic-low RESET and logic-high RESET down to VCC = 1V during power-up. Its internal voltage monitor compares VCC against a precision 2.63V threshold with 20mV hysteresis, while the 1.25V PFI comparator enables external power-fail detection via resistive divider.
No watchdog timer is present-unlike MAX706 variants-making MAX708RCUA+T suitable for applications requiring deterministic reset control without activity supervision. The manual reset (MR) input is TTL/CMOS-compatible, debounced by ≥140ms minimum pulse width, and internally pulled up with 70µA current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling), enabling reliable reset assertion for +3V systems before brownout |
| Reset Pulse Width | 200ms typical, ensuring µP completes full initialization before release |
| Supply Voltage Range | 1.0V to 5.5V, supporting operation down to VCC = 1V with guaranteed RESET assertion |
| Quiescent Current | 100µA max at VCC < 3.6V, minimizing battery drain in portable instruments |
| PFI Input Threshold | 1.25V ±0.05V, allowing precise low-battery or unregulated supply monitoring |
| MR Input Pullup Current | 70µA, enabling direct pushbutton connection without external resistor |
| Operating Temperature | 0°C to +70°C, qualified for commercial-grade embedded controller environments |
Pinout & Package
MAX708RCUA+T is housed in an 8-pin µMAX package (U8-1), 3mm × 3mm, 0.5mm pitch, thermally enhanced with exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Active-low manual reset input | TTL/CMOS-compatible; internally pulled up with 70µA; triggers both RESET and RESET when pulled below 0.6V |
| 2 (VCC) | Positive supply input | Accepts 1.0V–5.5V; powers all internal comparators and reset generators |
| 3 (GND) | Ground reference | Common return for all analog and digital functions; required for accurate threshold sensing |
| 4 (PFI) | Power-fail comparator input | Noninverting input referenced to internal 1.25V; used to monitor auxiliary supplies or battery voltage |
| 5 (PFO) | Active-low power-fail output | Sinks current when PFI < 1.25V; can drive MR or µP interrupt line directly |
| 6 (RESET) | Active-low reset output | Asserted low during power-up, brownout, or MR activation; held for 200ms after recovery |
| 7 (RESET) | Active-high reset output | Complementary to RESET; high during valid VCC, low during fault conditions |
| 8 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Guaranteed reset at low VCC | RESET asserted down to VCC = 1V ensures deterministic behavior during deep brownout |
| Debounced manual reset | 140ms minimum MR pulse width prevents contact bounce from causing spurious resets |
| Low-power operation | 100µA max quiescent current extends battery life in portable instrumentation |
| Configurable power-fail detection | 1.25V PFI threshold with 10mV hysteresis supports accurate early-warning of supply collapse |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller-Based Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by single Li-ion cell with DC-DC regulation to +3.3V. IC Role / Device Role / Timing Role: Supervises main supply rail and asserts dual reset signals to ensure clean µC boot before measurement firmware loads. Use Value: Prevents corrupted ADC calibration due to marginal VCC during wake-up; 100µA supply current extends runtime between charges. |
Use Scenario: PLC I/O module operating from +24V supply with local +3.3V LDO for ARM Cortex-M4 MCU. IC Role / Device Role / Timing Role: Monitors +3.3V rail and provides synchronized RESET/RESET to hold MCU in known state during power transients. Use Value: Eliminates watchdog-induced resets during EMI events; dual outputs interface natively with both FPGA and MCU reset inputs. |
| Computers & Embedded SBCs | Critical µP Power Monitoring |
Use Scenario: Fanless industrial PC using +3.3V core supply with backup coin-cell for RTC. IC Role / Device Role / Timing Role: Generates 200ms reset pulse on power-up and monitors VCC for brownout; PFO tied to RTC supervisor. Use Value: Ensures BIOS execution starts only after stable +3.3V; PFI detects coin-cell depletion before RTC data loss. |
Use Scenario: Medical infusion pump with safety-critical ARM-based controller requiring fail-safe startup. IC Role / Device Role / Timing Role: Provides redundant reset signaling (both polarities) and guarantees reset assertion to VCC = 1V for fault-tolerant sequencing. Use Value: Meets IEC 62304 Class C software requirements by eliminating undetermined reset states during undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SCUA+ | 2.93V reset threshold; identical pinout, package, and dual-reset functionality | Used where system requires higher reset trip point to accommodate +3.3V supply tolerance | Select when VCC nominal is 3.3V ±5% and margin against false reset is critical |
| MAX708TCUA+ | 3.08V reset threshold; same package, timing, and feature set as MAX708RCUA+ | Deployed in +3.3V systems with tight dropout margins or legacy designs specifying 3.08V trip | Choose for compatibility with existing board layouts designed for 3.08V threshold |
Compared with MAX708RCUA+, MAX708SCUA+ raises reset assertion voltage by 300mV for improved noise immunity in noisy 3.3V rails, while MAX708TCUA+ further increases threshold to 3.08V-making it optimal for systems where VCC droop must be tightly controlled before reset activation.
Availability
MAX708RCUA+T is available at Aetrix Electronics and suitable for battery-powered equipment, industrial controllers, embedded computers, and critical µP power monitoring requiring stable component supply across commercial temperature range.
Supply support for MAX708RCUA+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 applications, with emphasis on reliability and integration.
The MAX708 family delivers cost-effective, single-chip µP supervision for +3V systems-designed specifically to replace discrete reset circuits in portable, industrial, and computing equipment requiring dual-polarity reset and power-fail warning.
FAQ
What is the reset threshold voltage of MAX708RCUA+T?
The MAX708RCUA+T has a precision reset threshold of 2.63V (VCC falling), with 20mV hysteresis. This value is factory-trimmed and guaranteed over temperature. It ensures reliable reset assertion before brownout in +3V systems, and is distinct from the 2.93V (MAX708S) and 3.08V (MAX708T) variants. The threshold applies to both RESET and RESET outputs.
Does MAX708RCUA+T include a watchdog timer function?
No, MAX708RCUA+T does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family omits WDI and WDO pins entirely. Instead, MAX708RCUA+T provides both active-high (RESET) and active-low (RESET) outputs for flexible µP interface. This makes it ideal for applications requiring deterministic reset control without activity supervision.
What is the function of the N.C. pin on MAX708RCUA+T?
Pin 8 of MAX708RCUA+T is labeled N.C. (No Connection) and is not internally bonded. Per the official datasheet, it must remain unconnected-no pull-up, pull-down, or routing is permitted. This pin exists for package compatibility across the MAX706/MAX708 families but carries no electrical function in MAX708RCUA+T.
Can MAX708RCUA+T operate down to 1V supply voltage?
Yes, MAX708RCUA+T guarantees RESET assertion down to VCC = 1V (for MAX70_C grade), ensuring robust behavior during deep brownout. At VCC < 1V, RESET becomes high-impedance. For reliable low-VCC operation, a 100kΩ pulldown on RESET is recommended per Figure 6 in the datasheet to prevent floating states in CMOS inputs.
How is the PFI input used in MAX708RCUA+T?
The PFI input on MAX708RCUA+T connects to an internal 1.25V comparator reference. When external voltage at PFI falls below 1.25V, PFO goes low-enabling use cases like low-battery detection or unregulated supply monitoring. PFI is not connected to VCC internally, so users configure trip points via resistive dividers. Input bias current is ≤25nA, minimizing divider error.
MAX708RCUA+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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX708RCUA+T FAQ
1.How can I place an order for MAX708RCUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708RCUA+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 MAX708RCUA+T reliable?
The price and inventory of MAX708RCUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708RCUA+T is usually 5 days.
3.What payment methods are accepted for MAX708RCUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708RCUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708RCUA+T?
MAX708RCUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708RCUA+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 MAX708RCUA+T?
For technical support, including MAX708RCUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708RCUA+T requirements.
6.How does Aetrix verify that MAX708RCUA+T is sourced from the original manufacturer or authorized distributors?
All MAX708RCUA+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 MAX708RCUA+T meets industry standards.
7.What is the process for return or replacement of MAX708RCUA+T?
All MAX708RCUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX708RCUA+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 MAX708RCUA+T part is unused and in its original packaging.
Return procedure for MAX708RCUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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