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Analog Devices Inc./Maxim Integrated MAX708RCUA+
- Part No.:
- MAX708RCUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX708RCUA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:141
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Product details
Overview
MAX708RCUA+ from Maxim Integrated is a +3V microprocessor supervisory circuit with active-high and active-low reset outputs, 2.63V reset threshold, 200ms reset pulse width, 100µA quiescent current, and 1.25V power-fail comparator input-designed for reliable power-up/power-down monitoring in battery-powered portable instruments and embedded controllers.
For engineers reviewing the MAX708RCUA+ datasheet, MAX708RCUA+ pinout, MAX708RCUA+ application, or MAX708RCUA+ equivalent, this page delivers verified functional identity, exact package mapping (8-pin µMAX), confirmed dual-reset architecture, validated timing behavior, and real-world selection guidance against comparable supervisory ICs.
Technical Context
The MAX708RCUA+ integrates dual independent reset generators-one active-high (RESET), one active-low (RESET)-both asserted when VCC falls below 2.63V or MR is pulled low, with guaranteed assertion down to VCC = 1V and deassertion after a fixed 200ms delay. It includes a precision 1.25V reference-based power-fail comparator (PFI/PFO) for early-warning voltage monitoring.
Unlike the MAX706 series, the MAX708RCUA+ omits the watchdog timer but adds simultaneous complementary reset outputs. Its internal reset generator uses a temperature-stable bandgap reference and hysteresis-enhanced threshold detection, ensuring immunity to supply noise during brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V (VCC falling); ensures reliable reset assertion before 3.3V µP brownout |
| Reset Pulse Width | 200ms typical; provides sufficient 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 ±50mV on PFI input; supports configurable undervoltage warning via external resistor divider |
| Operating Voltage Range | 1.0V to 5.5V; guarantees RESET/RESET assertion even during deep brownout (down to VCC = 1V) |
| Output Drive Strength | 1.2mA sink (RESET), 500µA source (RESET) at VCC = 3.3V; directly interfaces with standard CMOS inputs |
| Temperature Range | 0°C to +70°C; qualified for commercial-grade embedded systems and instrumentation |
Pinout & Package
MAX708RCUA+ 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.
| 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 1.0V–5.5V; powers all internal circuits including reset generator and PFI comparator |
| 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) node referenced to internal 1.25V; used with external resistive divider for custom trip points |
| 5 (PFO) | Active-low power-fail output | Open-drain output sinks current when PFI < 1.25V; can drive MR or µP interrupt line directly |
| 6 (N.C.) | No connection | Not internally bonded; must remain unconnected per datasheet; no routing or stubs allowed |
| 7 (RESET) | Active-low reset output | Guaranteed logic-low when VCC < 2.63V or MR low; remains asserted for 200ms after recovery |
| 8 (RESET) | Active-high reset output | Complementary to RESET; high during valid VCC; deasserts synchronously with RESET release |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems |
| Guaranteed reset assertion to VCC = 1V | Ensures deterministic system state during deep brownout or battery depletion-critical for data retention and safe shutdown |
| 1.25V precision power-fail comparator | Enables accurate early-warning detection of main or auxiliary supply failure using only two external resistors |
| 200ms factory-trimmed reset timeout | Eliminates external RC timing components, reducing BOM count and improving production yield and temperature stability |
| 8-pin µMAX surface-mount package | 3.0mm × 3.0mm footprint saves >50% board area vs. SO-8; compatible with standard reflow profiles and automated assembly |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller-Based Controllers |
|---|---|
Use Scenario: Handheld multimeter powered by single 3.3V Li-ion cell with AC adapter backup. IC Role / Device Role / Timing Role: Supervises VCC during battery swap and adapter insertion; asserts both RESET and RESET to halt firmware execution and preserve EEPROM state. Use Value: Prevents erratic µP behavior during 100–300ms transition window; 100µA quiescent current extends battery runtime by >12 months in sleep mode. |
Use Scenario: PLC I/O module operating from 3.3V rail derived from isolated DC-DC converter. IC Role / Device Role / Timing Role: Monitors 3.3V rail integrity and generates synchronized reset pulses to ARM Cortex-M4 core and CAN transceiver. Use Value: Dual-reset outputs enable direct connection to µP's nRST and FPGA's PROG_B without level-shifting or inversion logic. |
| Medical Point-of-Care Diagnostic Devices | Embedded Network Gateways |
Use Scenario: Portable ultrasound imager with real-time DSP and flash storage requiring clean boot sequence. IC Role / Device Role / Timing Role: Provides 200ms reset hold-off while DDR memory PLL locks and NAND controller initializes. Use Value: Eliminates boot failures caused by marginal VCC ramp rates; 2.63V threshold matches 3.3V LDO dropout characteristics. |
Use Scenario: Cellular-to-Ethernet gateway with dual-power sources (battery + PoE) and watchdog-free operation. IC Role / Device Role / Timing Role: Detects primary 3.3V rail collapse and triggers controlled failover to backup battery via PFO→MR chain. Use Value: PFI comparator allows independent monitoring of PoE-derived 3.3V and battery-backed 3.3V rails with shared reset logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706RCUA+ | Single active-low RESET output; includes watchdog timer (1.6s timeout); no RESET output | Requires external inverter for active-high reset; suitable where watchdog supervision is mandatory | Select when system-level fault recovery requires periodic software heartbeat validation |
| TPS3808G125DBVR | Single active-low RESET; adjustable reset threshold (1.25V–5.0V); 200ms fixed delay; 2.5µA IQ | Lower power but lacks dual-reset outputs and PFI comparator; requires external reference for power-fail detection | Select for ultra-low-power battery applications where dual-reset and PFI are not required |
Compared with MAX706RCUA+, MAX708RCUA+ trades watchdog capability for dual-reset flexibility and integrated PFI monitoring-making it optimal for deterministic, non-watchdog systems needing hardware-level reset coordination across multiple logic families. Against TPS3808G125DBVR, it offers higher integration (no external reference needed for PFI) at higher quiescent current, favoring robustness over nanoamp standby.
Availability
MAX708RCUA+ is available at Aetrix Electronics and suitable for battery-powered portable instruments, industrial microcontroller-based controllers, medical point-of-care diagnostic devices, and embedded network gateways requiring stable component supply across commercial temperature range and µMAX footprint compatibility.
Supply support for MAX708RCUA+ 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, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX708 family delivers cost-optimized, pin-compatible supervisory solutions for +3V/+3.3V µP systems-emphasizing dual-reset reliability, low-power operation, and flexible power-fail monitoring without external components.
FAQ
What is the function of the N.C. pin on MAX708RCUA+?
The N.C. (pin 6) on MAX708RCUA+ is not internally connected and must remain unconnected in the PCB layout. Routing traces to this pin or adding stubs may introduce parasitic capacitance that affects PFI noise immunity or reset timing accuracy. The datasheet explicitly prohibits any connection to this terminal to ensure guaranteed electrical performance across temperature and voltage ranges. MAX708RCUA+ relies solely on pins 1–5 and 7–8 for full functionality.
Does MAX708RCUA+ include a watchdog timer?
No, MAX708RCUA+ does not include a watchdog timer. Unlike the MAX706 series, the MAX708 family replaces the watchdog function with dual complementary reset outputs (RESET and RESET). This architectural choice prioritizes deterministic reset coordination over software supervision-making MAX708RCUA+ ideal for systems where external watchdog logic is handled separately or not required. The absence of WDI and WDO pins confirms this distinction in the pin configuration.
How does the PFI input work in MAX708RCUA+?
The PFI input in MAX708RCUA+ connects to the inverting input of an internal comparator referenced to a precise 1.25V bandgap voltage. When the external voltage applied to PFI falls below 1.25V, the PFO output goes low to signal impending power failure. Designers configure trip points using a resistive divider from VCC or another supply to PFI. MAX708RCUA+'s PFI draws only ±25nA, minimizing divider current error and enabling high-impedance sensing of regulated or unregulated rails.
What is the minimum VCC required for guaranteed RESET assertion in MAX708RCUA+?
MAX708RCUA+ guarantees RESET (active-low) and RESET (active-high) assertion down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Below 1.0V, the outputs enter high-impedance state. This feature ensures deterministic system halt during deep brownout conditions-critical for preserving SRAM contents and preventing flash corruption in battery-powered devices. The guarantee holds across the full 0°C to +70°C operating range.
Can MAX708RCUA+ monitor voltages other than VCC?
Yes, MAX708RCUA+ can monitor auxiliary voltages via its PFI input. By connecting a resistive divider from the target supply (e.g., +12V, -5V, or battery voltage) to PFI, designers set custom trip thresholds based on the 1.25V internal reference. Figure 5 and Figure 8 in the datasheet demonstrate monitoring of both positive and negative supplies. The PFI input's high impedance (±25nA) ensures minimal loading, and the PFO output can directly drive MR or a µP interrupt line to initiate controlled shutdown.
MAX708RCUA+ 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:
- 2.63V
- 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+ FAQ
1.How can I place an order for MAX708RCUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX708RCUA+ 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+ reliable?
The price and inventory of MAX708RCUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX708RCUA+ is usually 5 days.
3.What payment methods are accepted for MAX708RCUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX708RCUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX708RCUA+?
MAX708RCUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX708RCUA+ 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+?
For technical support, including MAX708RCUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX708RCUA+ requirements.
6.How does Aetrix verify that MAX708RCUA+ is sourced from the original manufacturer or authorized distributors?
All MAX708RCUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX708RCUA+?
All MAX708RCUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX708RCUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX708RCUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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