Analog Devices Inc. ADM8696ARW-REEL

Overview

ADM8696ARW-REEL from Analog Devices is a microprocessor supervisory circuit with integrated battery backup switchover, adjustable 1.3 V low-line monitor, watchdog timer (100 ms / 1.6 s / adjustable), power-fail detection, and reset generation down to 1 V VCC. It delivers up to 100 mA on VOUT during main supply operation and switches to VBATT backup with <70 mV switchover threshold, supporting CMOS RAM retention in industrial controllers and automotive systems.

For engineers reviewing the ADM8696ARW-REEL datasheet, ADM8696ARW-REEL pinout, ADM8696ARW-REEL application, or ADM8696ARW-REEL equivalent, key selection considerations include its guaranteed reset assertion at 1 V VCC, 400 nA standby current in battery mode, 0.7 Ω internal PMOS switch on VOUT, 1.3 V precision LLIN threshold with 12 mV hysteresis, and dual-mode watchdog timeout configuration via OSC SEL/OSC IN.

Technical Context

The ADM8696ARW-REEL implements a dual-threshold comparator architecture for LLIN (1.3 V ±50 mV) and PFI (1.3 V ±100 mV), with independent reset timing (35–70 ms) and watchdog timeout selection (100 ms short / 1.6 s long / externally adjustable). Its internal PMOS battery switch features 0.7 Ω on-resistance and automatic switchover triggered by VCC–VBATT differential thresholds (50 mV power-down, 70 mV power-up).

Reset assertion remains functional down to 1 V VCC, supported by a dedicated low-voltage bias network. The WDI input is a three-level, 5 MΩ impedance node internally biased to 38% of VCC; it disables the watchdog when floating or at midsupply. Battery backup mode reduces supply current to 0.4 µA while maintaining RESET, BATT ON, and WDO logic states per Table II.

Key Specifications

Pinout & Package

ADM8696ARW-REEL is housed in a 16-pin SOIC (R-16) package with 1.27 mm pitch, RoHS-compliant, and rated for –40°C to +85°C operation. Thermal impedance θ_JA = 110°C/W supports continuous 100 mA VOUT loading without derating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX696CPE+ and TPS3823-50DBVR, the ADM8696ARW-REEL uniquely integrates battery switchover, dual-voltage monitoring (LLIN + PFI), and adjustable watchdog in a single SOIC package-enabling compact, self-contained power management for mission-critical embedded systems without layout or BOM overhead.

Availability

ADM8696ARW-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADM8696ARW-REEL 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 ADM8696ARW-REEL belongs to Analog Devices' microprocessor supervisory IC product line, engineered specifically for robust power monitoring, battery-backed memory retention, and fail-safe system recovery in harsh-environment embedded applications.

FAQ

What is the minimum VCC voltage at which ADM8696ARW-REEL guarantees RESET assertion?

The ADM8696ARW-REEL guarantees RESET assertion down to 1 V VCC, as confirmed in the Absolute Maximum Ratings and General Description sections of the official datasheet. This ensures the microprocessor remains held in reset during severe brownout conditions where other supervisors may release prematurely. The internal bias network maintains comparator and timer functionality even at this ultra-low supply voltage, making ADM8696ARW-REEL suitable for applications with unstable or marginally regulated power rails.

How does the ADM8696ARW-REEL handle battery switchover during power failure?

The ADM8696ARW-REEL uses a dual-threshold comparator to monitor the VCC–VBATT differential: switchover initiates when VCC falls below VBATT by 70 mV during power-up and by 50 mV during power-down. Once triggered, an internal 0.7 Ω PMOS switch connects VBATT to VOUT, sustaining CMOS RAM with only 0.4 µA quiescent current. The BATT ON output goes high to indicate backup mode and can drive an external PNP transistor for >100 mA loads, as detailed in Figure 14 and Table II of the datasheet.

Can the watchdog timeout period of ADM8696ARW-REEL be adjusted, and how?

Yes, the ADM8696ARW-REEL watchdog timeout is configurable via OSC SEL and OSC IN pins. With OSC SEL high or floating, the internal oscillator provides fixed 100 ms (OSC IN low) or 1.6 s (OSC IN high) periods. With OSC SEL low, an external capacitor on OSC IN sets timeout as 400 ms × C/47 pF (short) or 1.6 s × C/47 pF (long); alternatively, an external clock (0–500 kHz) applied to OSC IN configures timeout in clock cycles (e.g., 4096 cycles for long period). All modes are validated in Table I and Figure 4 of the datasheet.

What is the function of the LLIN pin on ADM8696ARW-REEL, and what voltage threshold does it use?

The LLIN pin on ADM8696ARW-REEL is the low-line input that feeds the primary reset comparator, set to a precision 1.3 V threshold (±50 mV) with 12 mV hysteresis. It monitors the main system supply (e.g., 5 V or 3.3 V rail) and triggers RESET when voltage drops below threshold. Critically, LLIN also controls battery switchover logic and LOW LINE output assertion, making it central to both reset generation and power path management. Its input current is ±0.01 nA, minimizing loading on voltage divider networks.

Does ADM8696ARW-REEL support both active-low and active-high reset outputs, and how are they implemented?

Yes, ADM8696ARW-REEL provides both active-low RESET (pin 15) and active-high RESET (pin 16) outputs. These are complementary signals generated from the same internal comparator, ensuring synchronized assertion and deassertion. The active-low output drives standard µP reset inputs, while the active-high version supports processors requiring high-active reset without external inverters. Both outputs remain functional down to 1 V VCC and exhibit 0.1–0.4 V low-state voltage under load, as specified in the RESET Output Voltage section of the datasheet.