Analog Devices Inc. ADM706SANZ

Overview

ADM706SANZ from Analog Devices is a 3 V microprocessor supervisory circuit with active-low reset output, 2.93 V precision voltage monitor threshold, 200 ms reset pulse width, 100 µA quiescent current, and integrated watchdog timer (1.6 s timeout). It ensures reliable power-on, brownout, and software-fault recovery in embedded controllers and battery-powered instrumentation.

For engineers reviewing the ADM706SANZ datasheet, ADM706SANZ pinout, ADM706SANZ application, or ADM706SANZ equivalent, key selection criteria include its 2.93 V reset threshold for 3 V systems, guaranteed RESET validity down to VCC = 1 V, debounced manual reset input (MR), independent watchdog input (WDI) and output (WDO), and dual-supply monitoring capability via PFI/PFO.

Technical Context

The ADM706SANZ implements a precision bandgap-based voltage reference (2.93 V ±40 mV) for supply monitoring and a separate 1.25 V reference for the power-fail comparator. Its reset generator guarantees assertion until VCC exceeds threshold and holds active for 200 ms after recovery, with internal timing independent of external components.

It integrates a transition-detecting watchdog timer cleared by any WDI edge (min. 50 ns), forcing WDO low on timeout or VCC undervoltage. The MR input features 70 µA internal pull-up and TTL/CMOS compatibility, while PFI accepts up to VCC + 0.3 V and drives PFO low when below 1.25 V.

Key Specifications

Pinout & Package

ADM706SANZ 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 coplanar within 0.10 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706SAP+, ADM706SANZ offers identical supervision behavior but originates from Analog Devices' qualified process; versus TPS3808G33DBVR, ADM706SANZ provides full feature parity (watchdog, power-fail warning, manual reset) in a through-hole PDIP package optimized for prototyping and industrial assembly.

Availability

ADM706SANZ is available at Aetrix Electronics and suitable for industrial controllers, battery-powered instrumentation, embedded microprocessor reset circuits, and multi-rail power sequencing applications requiring stable component supply and long-term lifecycle support.

Supply support for ADM706SANZ 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 ADM706 family was designed specifically for robust microprocessor supervision in industrial, computing, and portable systems-emphasizing low-power operation, guaranteed reset validity at ultra-low VCC, and integrated fault-detection features.

FAQ

What is the reset threshold voltage of the ADM706SANZ?

The ADM706SANZ has a nominal reset threshold of 2.93 V, with a tolerance of ±40 mV (2.85 V to 3.00 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The threshold is used to detect undervoltage conditions on the VCC supply and initiate a 200 ms active-low RESET pulse. The ADM706SANZ belongs to the "S" variant of the ADM706 series, distinguishing it from the 2.63 V (R) and 3.08 V (T) versions.

Does the ADM706SANZ include a watchdog timer function?

Yes, the ADM706SANZ includes a fully integrated watchdog timer with a nominal timeout period of 1.6 seconds. The timer is cleared by any rising or falling edge on the WDI pin, and times out if no transition occurs within that window. Upon timeout, the WDO pin drives low. The timer is also reset automatically when RESET is asserted. This functionality is confirmed in the ADM706P/R/S/T datasheet Rev. E, Figure 1 and Table 1.

Can the ADM706SANZ monitor a second power supply?

Yes, the ADM706SANZ can monitor a second supply using its dedicated PFI (Power-Fail Input) and PFO (Power-Fail Output) pins. The internal 1.25 V comparator compares the voltage at PFI to a precision reference; when PFI falls below 1.25 V, PFO goes low. By connecting PFI to a resistor divider from the auxiliary supply, designers can configure early-warning detection-for example, triggering PFO at 4.5 V on a 5 V rail. This capability is documented in the Applications Information section (Page 12) of the ADM706 datasheet.

What package type is used for the ADM706SANZ?

The ADM706SANZ is supplied in an 8-lead narrow-body plastic dual in-line package (PDIP), designated N-8 per JEDEC MS-001. Its dimensions are 0.300 inches wide with 0.100 inch lead pitch. This through-hole package is suitable for prototyping, industrial control boards, and applications requiring mechanical robustness and hand-soldering compatibility. The "ANZ" suffix in the part number explicitly denotes this PDIP configuration.

Is the RESET output of the ADM706SANZ active-high or active-low?

The RESET output of the ADM706SANZ is active-low. As an "S"-suffix variant in the ADM706R/S/T group, it provides a push-pull active-low RESET signal (Pin 7), unlike the ADM706P which offers active-high RESET. This is confirmed in the General Description (Page 1), Pin Configurations (Figure 4), and Table 3 of the datasheet. The output remains low for 200 ms after VCC rises above 2.93 V or after MR is released, and stays valid down to VCC = 1 V.