Analog Devices Inc. ADM706TANZ

Overview

ADM706TANZ 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 V/3.3 V power supplies in embedded systems requiring reliable power-on, brownout, and fault recovery-e.g., industrial controllers with battery-backed operation.

For engineers reviewing the ADM706TANZ datasheet, ADM706TANZ pinout, ADM706TANZ application, or ADM706TANZ equivalent, key selection criteria include its 3.08 V reset threshold, guaranteed RESET validity down to VCC = 1 V, debounced manual reset input (MR), independent watchdog monitoring, and dual-supply monitoring capability via PFI/PFO.

Technical Context

The ADM706TANZ implements a precision voltage monitor with 3.08 V ±75 mV reset threshold and 20 mV hysteresis, ensuring stable reset assertion during supply transients. Its internal 1.6 s watchdog timer clears on any WDI transition and forces WDO low on timeout or VCC undervoltage.

A dedicated 1.25 V power-fail comparator accepts external voltage division at PFI to generate early warning (PFO) for supply collapse or low-battery conditions. The MR input features 70 µA internal pull-up and 500 ns minimum pulse width support, enabling direct TTL/CMOS or mechanical switch interfacing without external debounce circuitry.

Key Specifications

Pinout & Package

ADM706TANZ is housed in an 8-lead narrow-body PDIP (N-8) package per JEDEC MS-001, with 0.300-inch body width and 0.100-inch lead pitch. Pin 1 is marked with a notch or dot; leads are straight and gull-wing formed for through-hole mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706TCSA+ and TPS3808G30DBVR, ADM706TANZ uniquely combines 3.08 V precision reset, integrated watchdog, and dedicated power-fail comparator in a single PDIP package-making it optimal for industrial systems requiring coordinated reset, supervision, and early-warning capabilities without additional ICs.

Availability

ADM706TANZ is available at Aetrix Electronics and suitable for industrial PLCs, portable medical monitors, network edge routers, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM706TANZ 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 series was designed specifically for robust microprocessor supervision in harsh environments-delivering precision voltage monitoring, watchdog safety, and power-fail warning in compact packages for mission-critical embedded systems.

FAQ

What is the exact reset threshold voltage of the ADM706TANZ?

The ADM706TANZ has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V across temperature and supply variations. This value is factory-trimmed and specified in Table 1 of the Rev. E datasheet under "Reset Threshold (VRST)" for ADM706T/ADM708T devices. It is optimized for reliable supervision of 3.3 V power rails without excessive design margin.

Does the ADM706TANZ support watchdog functionality?

Yes, the ADM706TANZ includes a fully integrated watchdog timer with a typical timeout period of 1.6 seconds. It monitors the WDI pin for transitions and drives WDO low on timeout. The timer resets on any edge (high-to-low or low-to-high) at WDI, and is also cleared during RESET assertion. This functionality is confirmed in the Functional Block Diagram (Figure 13) and Table 1 specifications.

Can the ADM706TANZ monitor a second power supply?

Yes, the ADM706TANZ supports secondary supply monitoring via its PFI (Power-Fail Input) and PFO (Power-Fail Output) pins. A resistor divider scales the auxiliary supply to ≤1.25 V at PFI; when that voltage falls below threshold, PFO asserts low. This is documented in the "Power Fail Comparator" section (Page 11) and Figure 17 of the datasheet, and is functionally identical across all ADM706x variants including ADM706TANZ.

What package type is used for the ADM706TANZ?

The ADM706TANZ uses an 8-lead narrow-body plastic dual in-line package (PDIP), designated N-8 in the Ordering Guide (Page 14). Its outline dimensions conform to JEDEC standard MS-001, with 0.300-inch body width and 0.100-inch lead pitch. This through-hole package is suited for prototyping, industrial PCBs, and applications requiring mechanical robustness and serviceability.

Is the reset output of the ADM706TANZ active-high or active-low?

The ADM706TANZ provides an active-low reset output (labeled RESET on Pin 7), as confirmed in the General Description (Page 1), Pin Function Descriptions (Table 3, Page 6), and Functional Block Diagram (Figure 13). This distinguishes it from the ADM706P variant (active-high RESET) and aligns with common microcontroller reset input requirements. The output is push-pull, not open-drain.