Analog Devices Inc./Maxim Integrated MAX706PCSA+T

Overview

MAX706PCSA+T from Maxim Integrated is a +3V microprocessor supervisory circuit in 8-pin SO package, providing active-low reset output, 1.6s watchdog timer, 2.63V reset threshold, 1.25V power-fail comparator input, and debounced manual-reset input - used for reliable power-up/brownout monitoring in battery-powered portable instruments and embedded controllers.

For engineers reviewing the MAX706PCSA+T datasheet, MAX706PCSA+T pinout, MAX706PCSA+T application, or MAX706PCSA+T equivalent, this device serves as a precision voltage monitor with integrated watchdog and power-fail warning for low-power µP systems operating from +3V to +5V supplies.

Technical Context

The MAX706PCSA+T implements a dedicated reset generator with internal 200ms delay timer, a 1.6s watchdog timeout circuit triggered by WDI transitions, and a separate 1.25V reference-based power-fail comparator (PFI/PFO) for independent supply monitoring. Its reset assertion is guaranteed down to VCC = 1V.

It features TTL/CMOS-compatible MR input with 500ns minimum pulse width at 3V, 70µA internal MR pullup, and WDO that asserts on both watchdog timeout and VCC brownout - but deasserts immediately upon VCC recovery, unlike RESET which maintains 200ms hold time.

Key Specifications

Pinout & Package

MAX706PCSA+T is housed in an 8-pin SO (Small Outline) package, 150 mil width, RoHS-compliant, surface-mountable with standard reflow profile.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706SCSA+T, the MAX706PCSA+T offers tighter reset margin for 3V battery systems; compared with TPS3808G12DBVR, it delivers integrated watchdog and power-fail monitoring in the same SO-8 footprint - enabling feature-rich supervision without increasing component count.

Availability

MAX706PCSA+T is available at Aetrix Electronics and suitable for battery-powered equipment, portable instruments, and industrial controllers requiring stable component supply across commercial temperature range and long-term production cycles.

Supply support for MAX706PCSA+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 interface applications in industrial, automotive, and communications markets.

The MAX706 family targets cost-sensitive, low-power µP supervision with integrated reset, watchdog, and power-fail detection - optimized for portable and embedded systems where reliability and minimal external components are critical.

FAQ

What is the reset threshold voltage of the MAX706PCSA+T?

The MAX706PCSA+T has a guaranteed reset threshold of 2.63V (VCC falling), with ±70mV tolerance over temperature and supply. This value is factory-trimmed and specified in the Electrical Characteristics table; it ensures reliable reset assertion before most +3V µPs exit their valid operating range. The MAX706PCSA+T maintains this threshold across its 0°C to +70°C operating range.

Does the MAX706PCSA+T include a watchdog timer function?

Yes, the MAX706PCSA+T includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer resets on any edge transition at the WDI pin and asserts the WDO output low if no transition occurs within that window. Unlike some variants, the MAX706PCSA+T watchdog cannot be disabled - it remains active whenever VCC is within specification.

Can the MAX706PCSA+T monitor a secondary power supply?

Yes, the MAX706PCSA+T includes a dedicated 1.25V precision reference and comparator accessible via the PFI and PFO pins. By connecting PFI to a resistive divider from an unregulated or auxiliary supply (e.g., +12V), the device generates an active-low PFO signal when that supply drops below the calculated threshold - enabling early power-fail warning independent of VCC.

What is the minimum pulse width required on the MR pin of the MAX706PCSA+T?

The MAX706PCSA+T requires a minimum MR pulse width of 500ns when VCC = +3V and 150ns when VCC = +5V. The MR input is TTL/CMOS-compatible and internally pulled up with 70µA, allowing direct connection to pushbutton switches or logic outputs. The resulting RESET pulse is guaranteed to be at least 200ms regardless of MR pulse duration.

Is the MAX706PCSA+T pin-compatible with other members of the MAX706 family?

Yes, the MAX706PCSA+T shares identical 8-pin SO package, pinout, and electrical interface with all MAX706x variants (e.g., MAX706RCSA+T, MAX706SCSA+T). Differences are limited to reset threshold voltage (2.63V for 'P', 2.93V for 'S', 3.08V for 'T') and reset polarity (active-low for 'P/R/S/T' vs. active-high for 'AP/AR/AS/AT'). No PCB changes are needed when substituting within the same suffix group.