Analog Devices Inc./Maxim Integrated MAX706CUA+T

Overview

The MAX706CUA+T from Maxim Integrated is a low-cost microprocessor supervisory circuit in an 8-pin µMAX package, providing active-low reset output, 1.6s watchdog timeout, 4.40V supply-voltage monitoring threshold, 1.25V power-fail comparator input, and debounced manual-reset input - used for reliable power-up/down/brownout detection in embedded controllers and intelligent instrumentation.

For engineers reviewing the MAX706CUA+T datasheet, MAX706CUA+T pinout, MAX706CUA+T application, or MAX706CUA+T equivalent, this page delivers verified technical context, real-world timing behavior, package-specific thermal limits, and validated alternative options for industrial µP reset supervision where VCC = 4.5V to 5.5V and ambient operation is 0°C to +70°C.

Technical Context

The MAX706CUA+T integrates four core supervisory functions: a precision voltage monitor with 4.40V ±150mV threshold and 40mV hysteresis, a 1.6s watchdog timer that triggers WDO low on missing WDI edge transitions, a 1.25V reference-based power-fail comparator (PFI/PFO), and a TTL/CMOS-compatible manual-reset input with internal 250µA pull-up and 150ns minimum pulse width.

Its RESET output asserts low for ≥140ms (typ. 200ms) when VCC drops below 4.40V or MR is pulled <0.8V, remains valid down to VCC = 1V, and guarantees ≤0.4V output at ISINK = 3.2mA; WDO responds immediately to VCC dropouts without minimum pulse width, while PFO provides open-drain low-active output for power-fail warning.

Key Specifications

Pinout & Package

MAX706CUA+T uses an 8-pin µMAX package (outline 21-0036), 3.0mm × 3.0mm body, 0.5mm pitch, exposed pad for thermal enhancement, RoHS-compliant lead-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with MAX706CUA+T, the MAX706CSA+ offers superior heat dissipation in convection-cooled industrial enclosures, while the MAX706CPA+ provides mechanical robustness and solderability for non-SMT workflows - neither is pin-compatible with the µMAX variant due to differing land patterns and thermal pad requirements.

Availability

MAX706CUA+T is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, automotive telematics gateways, and smart energy meters requiring stable component supply across extended production lifecycles.

Supply support for MAX706CUA+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, mixed-signal, and power management ICs for industrial, communications, and computing applications.

The MAX705–MAX708 family delivers cost-optimized, single-chip µP supervision targeting space-constrained embedded systems needing guaranteed reset timing, watchdog safety, and multi-rail monitoring without external components.

FAQ

What is the guaranteed minimum reset pulse width for MAX706CUA+T?

The MAX706CUA+T guarantees a reset pulse width of at least 140ms under all operating conditions (0°C to +70°C, VCC = 4.5V to 5.5V). Typical duration is 200ms, and maximum is 280ms. This meets or exceeds the minimum reset hold-time requirements of most 8-bit and 32-bit microcontrollers, including the Intel 80C51 and ARM Cortex-M series. The pulse starts when VCC rises above 4.40V or MR transitions from low to high.

Can MAX706CUA+T monitor a 12V supply rail?

Yes, the MAX706CUA+T can monitor a 12V supply using its PFI input. Connect a resistor divider between the 12V rail and GND such that the voltage at PFI equals 1.25V when the 12V rail reaches the desired trip point (e.g., 10.87V). The internal 1.25V comparator threshold ensures accurate detection. For example, a 1MΩ top resistor and 130kΩ bottom resistor yields ~10.87V trip at +25°C, as confirmed in the datasheet's Figure 6.

Does MAX706CUA+T provide an active-high reset output?

No, the MAX706CUA+T provides only an active-low RESET output. It belongs to the MAX706 subfamily, which includes watchdog functionality and active-low reset - unlike the MAX707/MAX708 (active-high + active-low) or MAX813L (active-high only). To generate an active-high signal, connect RESET to an external inverter or use a MAX707CUA+T instead.

What is the maximum supply current consumption of MAX706CUA+T?

The MAX706CUA+T draws a maximum supply current of 350µA over temperature (0°C to +70°C) and VCC range (4.5V to 5.5V), with typical consumption at 250µA. This ultra-low quiescent current enables long-term operation in battery-backed systems, supporting multi-year shelf life in applications like smart meters and portable medical devices where standby power budget is critical.

Is the µMAX package of MAX706CUA+T RoHS-compliant?

Yes, the "+T" suffix in MAX706CUA+T explicitly denotes lead(Pb)-free/RoHS-compliant packaging per Maxim Integrated's ordering conventions. The µMAX package uses matte tin finish and conforms to JEDEC J-STD-020 moisture sensitivity level 1 (MSL-1), with peak reflow temperature rated at +260°C for lead-free processes. The exposed thermal pad must be soldered to PCB ground for optimal thermal performance.