Analog Devices Inc. ADM8695ARWZ

Overview

ADM8695ARWZ from Analog Devices is a 16-lead TSSOP microprocessor supervisory circuit providing precision reset generation (200 ms nominal), adjustable watchdog timeout (100 ms / 1.6 s / external), battery backup switchover (VBATT to VOUT), CE gating (3 ns propagation), and power-fail warning (1.3 V PFI threshold). It ensures system reliability in industrial controllers and battery-backed memory systems.

For engineers reviewing the ADM8695ARWZ datasheet, ADM8695ARWZ pinout, ADM8695ARWZ application, or ADM8695ARWZ equivalent, key selection considerations include its dual reset/wdog output capability, 4.65 V reset threshold with 40 mV hysteresis, 100 mA VOUT drive, 0.4 μA battery standby current, and support for external oscillator or capacitor-based timing configuration.

Technical Context

The ADM8695ARWZ integrates five core functions: (1) power-on/brownout reset with guaranteed operation down to VCC = 1 V; (2) automatic battery switchover with 70 mV switchover threshold and 20 mV hysteresis; (3) three-mode watchdog timer (100 ms fixed, 1.6 s fixed, or externally adjustable); (4) active-high RESET and active-low WDO outputs; and (5) CEIN-to-CEOUT gating with 3 ns delay and forced-high behavior during undervoltage.

It features a 1.3 V power-fail comparator (PFI/PFO), internal 10.24 kHz oscillator (when OSC SEL high), and three-level WDI input that disables the watchdog when floating or at midsupply. The device uses an epitaxial CMOS process enabling 0.7 mW typical power consumption and 0.7 Ω on-resistance for VCC-to-VOUT switching.

Key Specifications

Pinout & Package

ADM8695ARWZ is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 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 ADM8691ARWZ and MAX695CPE+, the ADM8695ARWZ uniquely delivers 200 ms reset timing, full CEIN/CEOUT write protection, and dual reset outputs-making it optimal for new designs requiring robust memory safety and flexible timing control.

Availability

ADM8695ARWZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics units, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADM8695ARWZ 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 ADM869x family was designed specifically for microprocessor system supervision-integrating reset, watchdog, battery switchover, memory write protection, and power-fail warning into single-chip solutions for space- and reliability-critical embedded applications.

FAQ

What is the guaranteed minimum operating VCC for ADM8695ARWZ reset functionality?

The ADM8695ARWZ guarantees RESET output functionality down to VCC = 1 V, ensuring the microprocessor remains held in reset during deep brownout conditions. This specification is validated across the full −40°C to +85°C temperature range and is independent of VBATT voltage. The ADM8695ARWZ maintains this capability while delivering 200 ms reset pulse width and supporting all supervisory functions including CE gating and watchdog supervision.

How does the ADM8695ARWZ handle watchdog timer configuration during system startup?

The ADM8695ARWZ automatically defaults to the 1.6 s watchdog timeout period immediately after any reset event-including power-on, brownout, or manual reset-regardless of OSC IN state. This prevents spurious timeouts during MCU initialization. Once the first WDI transition occurs, the device switches to the configured timeout (100 ms or adjustable). This behavior is hardwired and requires no software configuration, ensuring reliable startup supervision for the ADM8695ARWZ.

Can ADM8695ARWZ drive both CMOS RAM and an external PNP transistor simultaneously?

Yes-the ADM8695ARWZ VOUT pin delivers up to 100 mA directly to CMOS RAM, while its dedicated BATT ON output can sink 35 mA to drive the base of an external PNP transistor. This dual-path architecture allows simultaneous RAM power delivery and extended current capability (e.g., >500 mA) via the external transistor. The ADM8695ARWZ internal design isolates these functions electrically, ensuring VOUT regulation remains stable even when BATT ON is actively sinking current.

What is the exact function of the LOW LINE pin on ADM8695ARWZ?

The LOW LINE pin on ADM8695ARWZ is an active-high logic output that asserts high whenever VCC exceeds the 4.65 V reset threshold. It is the logical inverse of the RESET pin (pin 15) and serves processors requiring active-high reset signaling. Unlike RESET, LOW LINE has no built-in pulse timing-it transitions immediately with VCC crossing the threshold and remains asserted as long as VCC stays above 4.65 V. This real-time status signal enables immediate peripheral enablement without waiting for the 200 ms RESET pulse to complete.

Does ADM8695ARWZ support external capacitor-based timing adjustment, and what is the calculation formula?

Yes-when OSC SEL is low, connecting a capacitor (C) between OSC IN and GND sets both reset pulse width and watchdog timeout. The nominal oscillator frequency is f_OSC (Hz) = 184,000 / C (pF). For example, a 47 pF capacitor yields ~3.91 kHz, resulting in 200 ms reset pulse width and 520 ms watchdog timeout for ADM8695ARWZ. This method provides precise, temperature-stable timing without external clock components, and the ADM8695ARWZ datasheet specifies performance across 10 pF to 1000 pF.