Analog Devices Inc. ADM706TARZ

Overview

ADM706TARZ from Analog Devices is a 3.08 V precision microprocessor supervisory IC with active-low reset output, 200 ms reset pulse width, 100 µA quiescent current, and integrated watchdog timer (1.6 s timeout). It monitors 3.15–5.5 V supplies in embedded systems requiring reliable power-on/brownout reset and fail-safe processor supervision.

For engineers reviewing the ADM706TARZ datasheet, ADM706TARZ pinout, ADM706TARZ application, or ADM706TARZ equivalent, this page delivers verified functional identity, SOIC-8 package mapping, reset threshold accuracy (3.00–3.15 V), watchdog timing behavior, and real-world use cases in battery-powered instrumentation and industrial controllers.

Technical Context

The ADM706TARZ implements a precision bandgap-based voltage reference (3.08 V ±75 mV) for supply monitoring, with hysteresis (20 mV) to prevent chatter during brownout recovery. Its internal watchdog timer resets on any WDI transition-high-to-low or low-to-high-and clears automatically upon RESET assertion.

It features a dedicated 1.25 V power-fail comparator (PFI/PFO) for early warning of supply collapse, debounced manual reset input (MR) with 70 µA internal pull-up, and guaranteed RESET validity down to VCC = 1 V-enabling robust shutdown sequencing even during deep undervoltage conditions.

Key Specifications

Pinout & Package

ADM706TARZ is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 × 4.00 mm body, and 1.75 mm max height. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706TCSA+ and TPS3808G33DBVR, ADM706TARZ uniquely integrates reset, watchdog, and power-fail comparator in one SOIC-8 device - reducing component count and enabling coordinated fault response without external logic or timing components.

Availability

ADM706TARZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial PLC controllers, medical point-of-care devices, and automotive body control modules requiring stable component supply across extended temperature ranges.

Supply support for ADM706TARZ 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM706x family was designed specifically for robust microprocessor supervision in harsh environments - delivering precise voltage monitoring, deterministic reset timing, and integrated fault-detection features for mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage for ADM706TARZ?

The ADM706TARZ has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V over temperature and supply variations. This value is factory-trimmed and specified in Table 1 of the Rev. E datasheet. The threshold applies to VCC monitoring and determines when the active-low RESET output is asserted during power-up, brownout, or power-down events. ADM706TARZ is specifically selected for 3.3 V systems where tighter tolerance than 2.93 V (S-version) or 2.63 V (R-version) is required.

Does ADM706TARZ include a watchdog timer, and what is its timeout period?

Yes, ADM706TARZ includes a fully integrated watchdog timer with a typical timeout period of 1.6 seconds. The timer resets on any valid transition (high-to-low or low-to-high) at the WDI pin and asserts the open-drain WDO output low upon timeout. The timeout is specified as 1.00–2.25 s across temperature and supply conditions. Unlike the ADM708T series, ADM706TARZ retains this watchdog function - making it suitable for applications requiring runtime firmware health verification in addition to power-supply supervision.

What package type and footprint does ADM706TARZ use?

ADM706TARZ is supplied in an 8-lead SOIC_N (narrow-body small outline integrated circuit) package, designated R-8 per JEDEC MS-012-AA. Its dimensions are 5.00 mm × 4.00 mm × 1.75 mm max, with 1.27 mm lead pitch and gull-wing leads. This matches the footprint of industry-standard SOIC-8 devices and is compatible with automated SMT assembly. The "Z" suffix confirms lead-free (RoHS-compliant) finish, and "-REEL" denotes tape-and-reel packaging for high-volume production use.

Can ADM706TARZ monitor a second supply voltage, and how is that implemented?

Yes, ADM706TARZ can monitor a second supply using its dedicated PFI (power-fail input) and PFO (power-fail output) pins. A resistor divider scales the auxiliary supply to fall below the internal 1.25 V comparator threshold when the monitored rail drops out of specification. For example, to detect failure of a 12 V supply, a 10:1 divider yields 1.2 V at PFI when input reaches 12 V - triggering PFO low. The PFO output can drive an interrupt or be connected to MR to generate a system-wide reset. This capability is confirmed in Figures 17–22 and the "Power Fail Comparator" section of the datasheet.

Is ADM706TARZ pin-compatible with other members of the ADM706x family?

Yes, ADM706TARZ shares identical pinout and package (SOIC-8 R-8) with all ADM706P/R/S/T variants, including ADM706RARZ and ADM706SARZ. All share the same MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO pin assignments shown in Figure 4. Differences are limited to internal reset threshold (3.08 V for T), RESET polarity (active-low for R/S/T), and functional blocks - meaning board-level substitution is possible without layout changes, provided the system design accommodates the specific threshold and feature set.