Analog Devices Inc. ADM8696AN

Overview

ADM8696AN from Analog Devices is a microprocessor supervisory circuit integrating power-on/brownout reset, adjustable low-line voltage monitoring (1.3 V threshold), watchdog timer with 100 ms / 1.6 s or user-adjustable timeout, automatic battery backup switchover (VBATT to VOUT), and power-fail warning (PFI/PFO). It delivers up to 100 mA from VOUT in normal operation and operates down to 1 V VCC for guaranteed reset assertion - used in industrial controllers and automotive microprocessor systems requiring reliable power integrity.

For engineers reviewing the ADM8696AN datasheet, ADM8696AN pinout, ADM8696AN application, or ADM8696AN equivalent, this page provides verified functional identity, validated 16-pin DIP package mapping, confirmed battery switchover behavior, exact reset timeout (50 ms typ.), and two field-validated alternative parts with documented technical and application differences.

Technical Context

The ADM8696AN implements a dual-threshold comparator architecture: LLIN monitors VCC against a precision 1.3 V reference with ~12 mV hysteresis for noise immunity, while PFI compares an external voltage against the same 1.3 V reference to generate early power-fail warnings. Its internal PMOS switch enables seamless VCC-to-VBATT switchover when VCC drops below VBATT by >70 mV during power failure.

Reset generation uses a monostable timer triggered by LLIN crossing 1.3 V (50 ms active-low pulse), and the watchdog timer resets on WDI transitions - supporting fixed (100 ms/1.6 s) or capacitor- or clock-adjusted timeouts. BATT ON provides logic-level control of external PNP transistors to extend VOUT current beyond 100 mA.

Key Specifications

Pinout & Package

ADM8696AN is housed in a 16-pin plastic DIP (N-16) package with 0.3-inch body width and through-hole mounting. Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise layout from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX696CPD+ and TPS3823MPDBVR, the ADM8696AN uniquely integrates battery switchover, dual-comparator monitoring (LLIN + PFI), and configurable watchdog - making it irreplaceable in systems requiring coordinated power fail response, RAM backup, and software supervision.

Availability

ADM8696AN is available at Aetrix Electronics and suitable for industrial controllers, automotive ECUs, medical instruments, and point-of-sale terminals requiring stable component supply with long-term lifecycle assurance.

Supply support for ADM8696AN 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, founded in 1965 and headquartered in Wilmington, MA.

The ADM8696AN belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust power integrity management in mission-critical embedded systems where reset reliability, battery backup, and early power-fail detection are mandatory.

FAQ

What is the minimum VCC voltage at which ADM8696AN guarantees RESET assertion?

The ADM8696AN guarantees RESET assertion down to VCC = 1 V, as specified in the Absolute Maximum Ratings and confirmed in the RESET Output Voltage specification table. This ensures the microprocessor remains held in reset during deep brownout conditions where other supervisory ICs may release prematurely. The ADM8696AN achieves this via optimized internal biasing and low-voltage comparator design - a key differentiator versus alternatives like MAX696CPD+, which lacks sub-2 V reset guarantee.

How does ADM8696AN handle battery switchover during power failure?

The ADM8696AN automatically switches VOUT from VCC to VBATT when VCC falls below VBATT by ≥70 mV (power-up) or ≥50 mV (power-down), as defined by its internal comparator hysteresis. During switchover, BATT ON goes high to signal battery activation, and VOUT maintains continuity with <5 mV dropout at 250 µA load. This behavior is validated in Table II (Battery Backup Mode) and Figure 1 - ensuring zero-gap power to CMOS RAM without external circuitry.

Can ADM8696AN's watchdog timer be disabled, and how?

Yes, the ADM8696AN watchdog timer is disabled when WDI is left floating or driven to midsupply (~VCC/2), as stated in the PIN FUNCTION DESCRIPTION and CIRCUIT INFORMATION sections. This is achieved by internal disconnection of WDI from the timing circuit - not by pulling high or low. Driving WDI to logic high or low continuously will cause timeout resets; only true float or mid-rail bias disables it. This differs from many competitors that require dedicated enable pins.

What is the function of the PFI and PFO pins on ADM8696AN?

PFI is a dedicated noninverting input compared to the internal 1.3 V reference; when PFI voltage drops below 1.3 V, PFO (an open-drain output) pulls low to signal impending power failure - typically used to trigger NMI interrupts for data save. Unlike LLIN, PFI allows independent threshold setting via external resistor dividers and is disabled during battery backup mode. This dual-comparator architecture enables staged response: PFO for early warning, then RESET for final shutdown.

Is ADM8696AN compatible with 3.3 V microprocessor systems?

Yes, ADM8696AN operates over VCC = 3.0 V to 5.5 V and supports 3.3 V logic levels: WDI thresholds are 1.2 V (VIH) and 0.8 V (VIL) at VCC = 3 V; RESET, WDO, and PFO outputs drive to >2.7 V (ISOURCE = 1 µA) and <0.4 V (ISINK = 3.2 mA); and LLIN/PFI thresholds remain at 1.3 V regardless of VCC. All timing parameters (e.g., 50 ms reset delay) are fully characterized across the range - confirmed in the SPECIFICATIONS table under "Test Conditions".