Analog Devices Inc. ADM706ANZ

Overview

ADM706ANZ from Analog Devices is a low-cost microprocessor supervisory circuit designed for 5 V supply monitoring and system reset generation in embedded controllers and instrumentation. It features a 4.40 V reset threshold, 200 ms reset pulse width, 190 μA quiescent current, and integrated watchdog timer with 1.60 sec timeout-ensuring reliable power-up, brownout, and software stall detection in industrial microprocessor systems.

For engineers reviewing the ADM706ANZ datasheet, ADM706ANZ pinout, ADM706ANZ application, or ADM706ANZ equivalent, key selection criteria include guaranteed RESET validity down to 1 V VCC, debounced manual reset input (MR), independent power-fail comparator (PFI/PFO), and compatibility with TTL/CMOS logic interfaces in PDIP-8 packaging.

Technical Context

The ADM706ANZ integrates three core monitoring functions: precision voltage supervision (4.40 V ±150 mV threshold with 40 mV hysteresis), a self-clearing watchdog timer triggered by WDI transitions, and a 1.25 V reference-based power-fail comparator accepting external voltage dividers on PFI. All functions operate independently and remain functional down to VCC = 1 V.

Its internal architecture includes a 250 μA MR pull-up current, TTL/CMOS-compatible inputs (MR, WDI), open-drain WDO and active-low RESET outputs, and a dedicated PFO output for early power-fail warning-enabling coordinated shutdown sequencing without external components.

Key Specifications

Pinout & Package

ADM706ANZ is housed in an 8-lead narrow-body plastic dual-in-line package (PDIP, N-8), compliant with JEDEC MS-001-BA, with 0.300-inch body width and 0.100-inch lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706CSA+ and TPS3823-44DBVR, the ADM706ANZ uniquely combines 4.40 V reset supervision, watchdog timer, and power-fail comparator in a single PDIP-8 device-providing full-system monitoring without external components or layout changes.

Availability

ADM706ANZ is available at Aetrix Electronics and suitable for industrial PLCs, embedded instrumentation, medical devices, and telecom remote terminals requiring stable component supply across extended temperature ranges (−40°C to +85°C).

Supply support for ADM706ANZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM705/ADM706 family was engineered specifically for cost-sensitive, reliability-critical microprocessor supervision in industrial and instrumentation applications-emphasizing low-voltage operation, integrated watchdog, and flexible power-fail monitoring.

FAQ

What is the reset threshold voltage of the ADM706ANZ?

The ADM706ANZ has a nominal reset threshold voltage of 4.40 V, with a tolerance of ±150 mV (4.25 V to 4.50 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The ADM706ANZ uses this threshold to assert its active-low RESET output whenever VCC falls below this level during power-down or brownout conditions, ensuring robust microprocessor reset behavior.

Does the ADM706ANZ include a watchdog timer function?

Yes, the ADM706ANZ includes an integrated watchdog timer with a nominal timeout period of 1.60 seconds. The timer is cleared by any transition (high-to-low or low-to-high) on the WDI pin. If no transition occurs within the timeout window, the WDO output goes low. This feature is confirmed in the Functional Block Diagram (Figure 1), Specifications table (tWD parameter), and Circuit Information section of the ADM706ANZ datasheet.

What package type is used for the ADM706ANZ?

The ADM706ANZ is supplied in an 8-lead narrow-body plastic dual-in-line package (PDIP), designated N-8 per the Analog Devices ordering guide. Its outline conforms to JEDEC standard MS-001-BA, with 0.300-inch body width and 0.100-inch lead pitch. The "Z" suffix indicates RoHS-compliant construction, and the device is rated for operation from −40°C to +85°C.

Can the ADM706ANZ monitor a secondary power supply?

Yes, the ADM706ANZ can monitor a secondary power supply using its PFI (Power-Fail Input) and PFO (Power-Fail Output) pins. The internal 1.25 V reference connects to the inverting input of a comparator, while PFI serves as the noninverting input. By applying a scaled version of the secondary supply to PFI via a resistor divider, the ADM706ANZ asserts PFO low when the monitored voltage drops below the 1.25 V threshold-enabling early-warning detection and orderly shutdown.

How does the manual reset (MR) input behave on the ADM706ANZ?

The MR input on the ADM706ANZ is a debounced, TTL/CMOS-compatible pin with an internal 250 μA pull-up current. Driving MR below 0.8 V (logic low) asserts the active-low RESET output for a minimum of 200 ms, regardless of VCC level. The input is electrically isolated from the reset generator's timing circuitry, and its 150 ns minimum pulse width requirement ensures noise immunity. This behavior is fully documented in the Pin Function Descriptions and Circuit Information sections of the ADM706ANZ datasheet.