Analog Devices Inc. ADM696ARZ

Overview

ADM696ARZ from Analog Devices is a microprocessor supervisory circuit integrating power-on/brownout reset, adjustable low-line voltage monitoring (1.3 V threshold), watchdog timer with 100 ms / 1.6 s selectable timeout, automatic battery backup switchover (VBATT to VOUT), and power-fail detection. It operates from 3.0 V to 5.5 V VCC and supports CMOS RAM backup in embedded controllers and industrial instrumentation.

For engineers reviewing the ADM696ARZ datasheet, ADM696ARZ pinout, ADM696ARZ application, or ADM696ARZ equivalent, this page delivers verified functional identity, validated 16-pin SOIC package mapping, confirmed 50 ms reset pulse width, battery switchover hysteresis (20 mV), and real-world timing behavior under brownout and watchdog timeout conditions.

Technical Context

The ADM696ARZ implements dual independent comparators: one for LLIN (1.3 V reference) driving RESET/LOW LINE with 12 mV hysteresis, and another for PFI (1.3 V reference) driving PFO with ±15 mV threshold tolerance. Its watchdog timer uses either internal oscillator (10.24 kHz nominal) or external clock/capacitor for configurable timeout periods.

Reset assertion is guaranteed down to VCC = 1 V, and battery switchover activates when VCC falls below VBATT by 50–70 mV (power-down/up hysteresis). The VOUT output delivers up to 100 mA with <0.5 V dropout in normal mode and switches to VBATT with 0.02 V typical dropout in backup mode.

Key Specifications

Pinout & Package

ADM696ARZ is housed in a 16-pin SOIC (R-16) package with 1.27 mm pitch, JEDEC MS-012 compliant, suitable for automated assembly and industrial thermal environments (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX696CPE+, ADM696ARZ offers programmable watchdog timing and lower backup current; versus TPS3823DBVR, it integrates battery switchover and watchdog-making it uniquely suited for self-contained, long-life backup systems.

Availability

ADM696ARZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ADM696ARZ 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 ADM696ARZ belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust, integrated power monitoring and battery backup in mission-critical embedded systems where reliability and long-term supply stability are mandatory.

FAQ

What is the guaranteed minimum VCC voltage at which ADM696ARZ asserts RESET?

The ADM696ARZ guarantees RESET assertion down to VCC = 1 V, ensuring reliable microprocessor hold-reset even during severe brownout conditions. This specification is tested and guaranteed across the full industrial temperature range (–40°C to +85°C), and the RESET output remains functional with valid logic levels (≤200 mV low, ≥3.5 V high) at that voltage. This behavior is intrinsic to the ADM696ARZ's internal reset generator architecture and is independent of external components.

Can ADM696ARZ operate with a 3.3 V supply, and what is its reset threshold at that voltage?

Yes, ADM696ARZ operates fully across 3.0 V to 5.5 V VCC, including 3.3 V nominal systems. Its low-line input (LLIN) compares against a precision 1.3 V internal reference, so the reset threshold is fixed-not scaled with VCC. At 3.3 V, a resistor divider (e.g., 15.8 kΩ/10 kΩ) sets LLIN to 1.3 V when VCC reaches ~3.35 V, providing accurate undervoltage detection regardless of supply nominal. The 1.25–1.35 V threshold tolerance is specified at both 3 V and 5 V VCC.

How does ADM696ARZ handle battery switchover during power failure, and what is the dropout voltage in backup mode?

ADM696ARZ automatically switches VOUT from VCC to VBATT when VCC falls below VBATT by 50 mV (power-down threshold); it reverts when VCC rises 70 mV above VBATT (20 mV hysteresis). In battery backup mode, VOUT tracks VBATT with a typical dropout of 0.02 V at 250 µA load, enabling efficient use of low-voltage batteries (e.g., 2.0–3.6 V Li-ion or coin cells) to sustain CMOS RAM without external regulators.

Is ADM696ARZ watchdog timer compatible with both hardware and software reset initiation?

Yes, the ADM696ARZ watchdog timer responds to transitions on the WDI pin-either hardware-generated (e.g., timer output toggle) or software-driven (e.g., GPIO bit flip)-with identical timing behavior. A rising or falling edge restarts the timeout counter; sustained high/low states for >100 ms or >1.6 s (depending on configuration) trigger RESET. The WDI input is three-level biased (38% VCC), making it tolerant of partial-drive or floating states, and it disables cleanly when left unconnected.

What is the maximum continuous output current ADM696ARZ can deliver from its VOUT pin?

The ADM696ARZ delivers up to 100 mA continuously from its VOUT pin in normal (VCC-powered) mode, with a typical VCC–VOUT dropout of 0.025 V at 1 mA and ≤0.5 V at 100 mA. For loads exceeding 100 mA or requiring lower dropout, the BATT ON output can directly drive an external PNP transistor in parallel with the internal switch-enabling scalable current delivery while retaining all supervisory functions intact.