Analog Devices Inc. ADM8693AN

Overview

ADM8693AN from Analog Devices is a 16-lead supervisory IC for microprocessor systems, providing precision reset (4.4 V threshold), adjustable watchdog timeout (100 ms / 1.6 s / adjustable), automatic battery backup switchover, CE gating (3 ns propagation), and power-fail detection (1.3 V comparator). It supports industrial temperature range (−40°C to +85°C) and drives up to 100 mA on VOUT for CMOS RAM backup in embedded controllers.

For engineers reviewing the ADM8693AN datasheet, ADM8693AN pinout, ADM8693AN application, or ADM8693AN equivalent, key selection criteria include its dual-mode watchdog (fixed/adjustable), active-high RESET complement, BATT ON output for external PNP drive, and compatibility with 5 V ±10% supplies in automotive and industrial control systems.

Technical Context

The ADM8693AN integrates a precision 4.4 V reset voltage detector with 40 mV hysteresis, a three-level WDI input supporting watchdog disable via floating/midsupply bias, and an internal oscillator selectable via OSC SEL to enable fixed or capacitor-adjusted timing. Its battery switchover circuit uses 70 mV rise and 50 mV fall thresholds with 20 mV hysteresis to prevent chatter during slow VCC transitions.

It features separate logic outputs: RESET (active low, 50 ms pulse), RESET (active high), WDO (watchdog status), LOW LINE (VCC fault flag), BATT ON (battery-active indicator), and CEOUT (gated chip enable with 3 ns delay). All digital outputs are CMOS-compatible with 0.4 V sink and 3.5 V source capability under load.

Key Specifications

Pinout & Package

ADM8693AN is housed in a 16-lead narrow-body SOIC (SOIC_N) package per JEDEC MS-012, with 1.27 mm pitch and 10.3 mm × 7.5 mm footprint. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX692AESA+ and TPS3823-45DBVR, the ADM8693AN delivers integrated battery switchover, CE gating, and dual-mode watchdog - eliminating four external components and enabling full system-level fault resilience in a single 16-pin SOIC.

Availability

ADM8693AN is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, smart energy meters, and embedded instrumentation requiring stable component supply across extended product lifecycles.

Supply support for ADM8693AN 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 Norwood, MA, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM869x family was designed specifically for microprocessor supervisory functions in harsh environments - integrating reset, watchdog, battery switchover, and memory protection into a single IC to reduce system complexity and improve reliability.

FAQ

What is the guaranteed reset voltage threshold range for ADM8693AN?

The ADM8693AN has a guaranteed reset voltage threshold range of 4.25 V to 4.48 V at −40°C to +85°C, with a typical value of 4.4 V. This specification ensures reliable reset assertion for 5 V ±10% power supplies and remains valid across the full industrial temperature range. The ADM8693AN reset comparator includes 40 mV hysteresis to prevent oscillation during slow supply ramps.

How does ADM8693AN handle battery switchover during power transitions?

The ADM8693AN performs automatic battery switchover using asymmetric thresholds: VCC must exceed VBATT by 70 mV to switch from battery to main supply (power-up), and VCC must fall 50 mV below VBATT to switch from main to battery (power-down). This 20 mV hysteresis eliminates chattering during slow or noisy supply transitions. In backup mode, VOUT delivers VBATT with <2.5 mV dropout at 250 µA.

Can ADM8693AN generate an adjustable reset pulse width, and how is it configured?

Yes, ADM8693AN supports adjustable reset pulse width via its OSC SEL and OSC IN pins. With OSC SEL low, connecting a capacitor (e.g., 47 pF) from OSC IN to GND yields a nominal 400 ms reset pulse. Driving OSC IN with an external clock (e.g., 10 kHz) provides precise cycle-based control. When OSC SEL is high/floating, reset pulse defaults to 50 ms - making ADM8693AN adaptable to diverse processor initialization timing requirements.

What is the function of the BATT ON output on ADM8693AN, and what load can it drive?

The BATT ON output on ADM8693AN is an active-high logic signal indicating that VOUT is sourced from VBATT. It sinks up to 35 mA and is designed to directly drive the base of an external PNP transistor, enabling VOUT current extension beyond the internal 100 mA limit. This allows ADM8693AN to support high-capacity RAM banks or additional backup loads without external logic level-shifting or buffering.

Does ADM8693AN provide both active-high and active-low reset outputs, and how are they used?

Yes, ADM8693AN provides two complementary reset outputs: RESET (active-low) and RESET (active-high). RESET is the standard open-drain output asserted low during fault conditions, while RESET is its CMOS-compatible active-high inversion. This dual-output architecture eliminates the need for external inverters when interfacing with processors requiring either polarity - such as ARM Cortex-M series (active-low) or certain TI MSP430 variants (active-high).