Analog Devices Inc. ADM8696ARWZ

Overview

ADM8696ARWZ from Analog Devices is a microprocessor supervisory circuit integrating power-on/brownout reset, adjustable low-line voltage monitoring (1.3 V threshold), battery backup switchover (VBATT to VOUT), watchdog timer with 100 ms/1.6 s or adjustable timeout, and power-fail detection. It operates across 3.0–5.5 V VCC and supports CMOS RAM backup in industrial systems requiring reliable power sequencing and fail-safe recovery.

For engineers reviewing the ADM8696ARWZ datasheet, ADM8696ARWZ pinout, ADM8696ARWZ application, or ADM8696ARWZ equivalent, key selection considerations include its guaranteed RESET assertion down to 1 V VCC, automatic battery switchover with 70 mV switchover threshold, 400 nA standby current in backup mode, and dual active-low/high RESET outputs for compatibility with diverse µP families.

Technical Context

The ADM8696ARWZ implements a dual-threshold comparator architecture for LLIN (1.3 V ±50 mV) and PFI (1.3 V ±100 mV), with independent hysteresis (12 mV on LLIN, configurable on PFI). Its internal PMOS VOUT switch delivers up to 100 mA at <0.2 V dropout under load, while BATT ON provides 7 mA sink capability to drive external PNP transistors for extended current delivery.

Watchdog functionality uses a three-level WDI input (internally biased to 38% VCC, ~5 MΩ impedance) that resets on any transition; timeout is selectable via OSC SEL and OSC IN-enabling internal oscillator (100 ms or 1.6 s), external clock (4032–4097 cycles), or external capacitor (e.g., 47 pF yields 1.6 s nominal). RESET pulse width defaults to 50 ms and remains active during brownout until VCC ≥1 V.

Key Specifications

Pinout & Package

ADM8696ARWZ is packaged in a 16-lead SOIC (R-16) with 1.27 mm pitch, RoHS-compliant, and rated for −40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX696CSA+ and TPS3823DBVR, the ADM8696ARWZ uniquely integrates battery switchover, adjustable 1.3 V low-line detection, and configurable watchdog timing in a single SOIC package-enabling compact, low-power, fail-safe µP systems without external logic or discrete FETs.

Availability

ADM8696ARWZ 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, long-term lifecycle support, and guaranteed performance over −40°C to +85°C.

Supply support for ADM8696ARWZ 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 precision instrumentation, industrial automation, and automotive markets since 1965.

The ADM8696ARWZ belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for robust power monitoring, battery-backed memory retention, and watchdog-based system recovery in harsh industrial and automotive environments.

FAQ

What is the minimum VCC voltage at which ADM8696ARWZ guarantees RESET assertion?

The ADM8696ARWZ guarantees RESET assertion down to 1 V VCC, ensuring reliable microprocessor hold-down during severe brownout conditions. This specification is verified across the full industrial temperature range (−40°C to +85°C) and is independent of load on VOUT. The ADM8696ARWZ maintains functional RESET output drive capability even as VCC collapses, preventing spurious processor execution.

How does ADM8696ARWZ handle battery switchover between VCC and VBATT?

The ADM8696ARWZ uses an internal PMOS switch to route either VCC or VBATT to VOUT based on relative voltage and LLIN status. Switchover occurs when VCC drops below VBATT minus 50–70 mV (depending on power-up/down condition), with 20 mV hysteresis to prevent oscillation. In backup mode, VOUT tracks VBATT with <5 mV dropout at 250 µA, and supply current drops to 0.4 µA. The BATT ON output signals the transition and can directly drive an external PNP transistor for >100 mA loads.

Can ADM8696ARWZ generate a programmable reset pulse width?

Yes, the ADM8696ARWZ supports programmable reset pulse width via OSC SEL and OSC IN pins. With OSC SEL high or floating, reset width is fixed at 50 ms. With OSC SEL low, reset width becomes adjustable: using an external capacitor (e.g., 47 pF yields 50 ms), or external clock (512–4096 cycles). The datasheet specifies nominal values of 35–70 ms across temperature and supply, with timing directly tied to the same oscillator governing the watchdog timeout.

What is the function of the WDI pin on ADM8696ARWZ, and how is it biased?

WDI is the watchdog timer input pin on the ADM8696ARWZ, featuring three-level sensing with internal biasing to 38% of VCC and ~5 MΩ input impedance. A transition (high-to-low or low-to-high) resets the watchdog timer; failure to toggle within the selected timeout period triggers RESET and WDO low. Leaving WDI floating or driving it to midsupply disables the watchdog. Minimum pulse width is 50 ns at 5 V VCC, scaling with supply voltage per datasheet specifications.

Does ADM8696ARWZ provide both active-low and active-high RESET outputs?

Yes, the ADM8696ARWZ provides two complementary RESET outputs: pin 15 is active-low RESET, and pin 16 is active-high RESET. Both are valid simultaneously and driven by the same internal comparator and timer. The active-high RESET is the logical inverse of the active-low signal, enabling direct interface with microprocessors requiring either polarity without external inverters. Output drive strength is specified at 400 µA sink (0.4 V max) and 1 µA source (2.7–3.5 V min) across operating conditions.