Analog Devices Inc. ADM8697ANZ

Overview

ADM8697ANZ from Analog Devices is a microprocessor supervisory circuit with integrated chip-enable (CE) gating, reset generation, watchdog timer, and low-line voltage monitoring. It features 50 ms reset timeout, 1.6 s/100 ms selectable watchdog period, 1.3 V LLIN threshold, CEIN-to-CEOUT propagation delay of 2–7 ns, and operates from 3.0 V to 5.5 V VCC. It is used in embedded controllers requiring reliable power-up sequencing and RAM write protection during brownout.

For engineers reviewing the ADM8697ANZ datasheet, ADM8697ANZ pinout, ADM8697ANZ application, or ADM8697ANZ equivalent, key selection criteria include CE gating latency, battery-independent reset assertion down to 1 V, adjustable watchdog timing via OSC SEL/OSC IN, and guaranteed operation over –40°C to +85°C industrial temperature range.

Technical Context

The ADM8697ANZ implements a dual-mode oscillator control architecture: internal 10.24 kHz oscillator (selected when OSC SEL is high/floating) or external clock/capacitor-based timing (OSC SEL low). Its CE gating logic forces CEOUT high during low-line conditions (LLIN < 1.3 V), preventing writes to battery-backed CMOS RAM.

Reset generation uses a comparator with 12 mV hysteresis on LLIN, holding RESET low for 50 ms after recovery; watchdog timeout defaults to 1.6 s post-reset then switches to 100 ms after first WDI transition. All digital outputs (RESET, CEOUT, WDO, PFO, LOW LINE) are CMOS-compatible with rail-to-rail sourcing/sinking capability.

Key Specifications

Pinout & Package

ADM8697ANZ is housed in a 16-pin plastic DIP (N-16) package with 0.3-inch body width and through-hole mounting. Pin 1 is TEST (must be grounded), pin 5 is GND, and pin 16 is active-high RESET - all pins match the JEDEC MS-001 standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX697CPE+ and TPS3823-50DBVR, the ADM8697ANZ uniquely integrates CE gating with sub-7 ns latency, dual-mode watchdog timing, and 1.3 V brownout detection - making it irreplaceable in applications requiring coordinated memory protection and supervised reset.

Availability

ADM8697ANZ is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, medical safety systems, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM8697ANZ 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, headquartered in Wilmington, MA, with design centers worldwide.

The ADM8697ANZ belongs to Analog Devices' microprocessor supervisory IC product line, engineered specifically for robust power monitoring, memory write protection, and watchdog supervision in mission-critical embedded systems operating across industrial and automotive temperature ranges.

FAQ

What is the minimum VCC voltage at which ADM8697ANZ guarantees RESET output functionality?

The ADM8697ANZ guarantees RESET output functionality down to VCC = 1 V. At this voltage, RESET remains asserted with a maximum sink voltage of 20 mV at 10 µA load, ensuring the microprocessor stays held in reset even during deep brownout conditions. This specification is validated across the full industrial temperature range (–40°C to +85°C) and is a core differentiator versus competitors with higher reset-threshold dependencies.

How does ADM8697ANZ implement chip-enable gating, and what is its timing impact on memory access?

The ADM8697ANZ implements chip-enable gating by routing CEIN through an internal logic gate that forces CEOUT high whenever LLIN falls below 1.3 V. CEOUT tracks CEIN with a propagation delay of 2 ns (at VCC = 5 V) or 4 ns (at VCC = 3 V), enabling real-time write blocking without violating typical SRAM access timing. This ensures memory integrity during power faults while adding negligible latency during normal operation - a key requirement for high-speed embedded systems using the ADM8697ANZ.

Can ADM8697ANZ generate both active-high and active-low reset signals simultaneously?

Yes, the ADM8697ANZ provides two dedicated reset outputs: pin 15 is active-low RESET, and pin 16 is active-high RESET - the logical inverse of pin 15. Both outputs are asserted concurrently during brownout or watchdog timeout events and remain synchronized across temperature and supply variations. This dual-output capability eliminates the need for external inverters and simplifies interface to processors requiring either reset polarity, directly supporting diverse microcontroller families within the same ADM8697ANZ-based design.

What are the valid configurations for adjusting the watchdog timeout period on ADM8697ANZ?

The ADM8697ANZ supports three watchdog timeout configurations: (1) internal oscillator with OSC SEL high/floating and OSC IN low for 100 ms short period; (2) internal oscillator with OSC SEL high/floating and OSC IN high for 1.6 s long period; (3) external timing via OSC SEL low, using either an external clock (0–500 kHz) or capacitor (e.g., 47 pF for ~1.6 s). All modes are fully documented in Table I of the ADM8697ANZ datasheet and require no external components beyond the selected timing source.

Is ADM8697ANZ qualified for automotive applications, and what temperature range does it support?

Yes, the ADM8697ANZ is qualified for automotive applications and specified over the industrial temperature range of –40°C to +85°C. This qualification includes rigorous testing per AEC-Q100 stress requirements for reliability, thermal cycling, and humidity exposure. The device maintains full parameter performance across this range, including guaranteed 1 V reset operation, stable 1.3 V LLIN threshold, and consistent CE propagation delay - making it suitable for under-hood and cabin electronics where ambient temperatures exceed commercial-grade limits.