Analog Devices Inc. ADM706TAN

Overview

ADM706TAN from Analog Devices is a 3.08 V precision microprocessor supervisory IC with active-low reset output, integrated watchdog timer (1.6 s timeout), power-fail comparator (1.25 V threshold), and debounced manual reset input - designed for reliable power-up, brownout, and fault recovery in 3 V embedded systems.

For engineers reviewing the ADM706TAN datasheet, ADM706TAN pinout, ADM706TAN application, or ADM706TAN equivalent, this page delivers verified specifications, functional context, package-validated pin roles, real-world use cases, and two confirmed alternative parts - all grounded in Analog Devices Rev. E datasheet data.

Technical Context

The ADM706TAN implements a precision voltage monitor with 3.08 V ±75 mV reset threshold and 20 mV hysteresis, guaranteeing valid RESET assertion down to VCC = 1 V. 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 monitors external supplies via PFI and drives PFO low when input drops below threshold; MR input features 70 µA internal pull-up and 500 ns minimum pulse width support. All logic outputs meet TTL/CMOS drive requirements across 3.15–5.5 V VCC range.

Key Specifications

Pinout & Package

ADM706TAN is supplied in an 8-lead narrow-body PDIP (N-8) package with 0.3-inch width, compliant with JEDEC MS-001. Pin spacing is 0.1 inch (2.54 mm), and lead finish is lead-free (Pb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM706TAN, ADM706TARZ offers identical supervision performance in a smaller footprint for volume manufacturing, while MAX706TCSA+ sacrifices watchdog capability for legacy compatibility - making ADM706TAN the optimal choice when both precise 3 V monitoring and hardware-based fault recovery are required.

Availability

ADM706TAN is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, network edge routers, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADM706TAN 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM706x family was engineered specifically for robust, low-power microprocessor supervision in space-constrained 3 V systems - emphasizing precision threshold accuracy, guaranteed low-VCC operation, and integrated fault-detection functions.

FAQ

What is the exact reset threshold voltage of the ADM706TAN?

The ADM706TAN has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V at T_A = −40°C to +85°C. This value is factory-trimmed and specified in Table 1 of the Rev. E datasheet under "Reset Threshold (V_RST)" for ADM706T/ADM708T devices. The 3.08 V threshold is optimized for 3 V supply monitoring with adequate margin against ripple and temperature drift.

Does the ADM706TAN include a watchdog timer, and what is its timeout period?

Yes, the ADM706TAN includes an integrated watchdog timer with a typical timeout period of 1.6 seconds, specified as 1.00–2.25 s over temperature and voltage. The timer resets on any rising or falling edge at the WDI pin and forces WDO low if no transition occurs within the timeout window. This function is confirmed in the Features section and Table 1 of the ADM706TAN datasheet.

Can the ADM706TAN monitor a second power supply, and how is that implemented?

Yes, the ADM706TAN can monitor a second supply using its PFI input and 1.25 V internal reference. A resistor divider scales the auxiliary voltage so that it falls below 1.25 V at the desired trip point (e.g., 3.2 V → 1.25 V via R1/R2). When triggered, PFO goes low and can be routed to MR to generate a system reset - as shown in Figure 22 of the ADM706TAN datasheet.

What package type is used for the ADM706TAN, and is it lead-free?

The ADM706TAN uses an 8-lead narrow-body plastic dual in-line package (PDIP, N-8) with 0.3-inch width and 0.1-inch lead pitch. It is RoHS-compliant and lead-free, as confirmed in the Ordering Guide (Model ADM706TANZ) and Outline Dimensions (Figure 24) of the Rev. E datasheet. The package meets JEDEC MS-001 standards.

How does the ADM706TAN ensure valid reset assertion when VCC drops below 1 V?

The ADM706TAN guarantees valid RESET output down to VCC = 1 V, meaning the RESET pin remains actively driven low during deep undervoltage conditions. As described in the "Valid RESET Below 1 V VCC" section (Page 11), this ensures the microprocessor stays held in reset until power fully collapses - preventing undefined states. Below 1 V, external pull-down may be added per Figure 19.