Analog Devices Inc. ADM696AN

Overview

ADM696AN from Analog Devices is a microprocessor supervisory circuit integrating power-on/brownout reset, battery backup switchover, watchdog timer, low-line detection, and power-fail warning in a single 16-pin PDIP package. It asserts RESET down to 1 V VCC, provides 100 mA VOUT drive with <50 mV dropout, supports 100 ms or 1.6 s watchdog timeout, and features 1.3 V precision threshold detection for LLIN and PFI inputs - used in industrial controllers requiring reliable power monitoring and nonvolatile memory retention during outages.

For engineers reviewing the ADM696AN datasheet, ADM696AN pinout, ADM696AN application, or ADM696AN equivalent, this page delivers verified functional identity, exact pin roles, temperature-rated timing behavior (–40°C to +85°C), battery switchover hysteresis (20 mV), and design-meaningful specifications - all confirmed from Analog Devices' official ADM696/ADM697 Rev. 0 datasheet.

Technical Context

The ADM696AN implements dual independent comparators: one for LLIN (1.3 V reference, 12 mV hysteresis) driving RESET/LOW LINE, and another for PFI (1.3 V reference, ±15 mV tolerance vs. LLIN) driving PFO. Its watchdog logic uses either internal oscillator (10.24 kHz nominal) or external clock/capacitor for configurable timeout periods, with automatic 1.6 s post-reset initialization delay before switching to short-period mode.

Battery switchover employs PMOS pass transistors with 50 mV turn-off and 70 mV turn-on thresholds, delivering VOUT = VCC – 0.025 V (1 mA) or VCC – 0.25 V (≤100 mA) in normal operation, and VBATT – 0.02 V (250 µA) in backup mode. BATT ON output sinks 7 mA and directly drives external PNP transistors for >100 mA load support.

Key Specifications

Pinout & Package

ADM696AN is housed in a 16-pin plastic DIP (N-16) package with 0.3-inch body width and 0.1-inch lead pitch. Pin 1 is VBATT; pin 16 is WDI. All pins are through-hole compatible with standard IC sockets and wave-solder processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX696CPE+, ADM696AN adds programmable watchdog timing and external oscillator support; compared with TPS3823MPW, it integrates battery management, dual comparators, and full watchdog supervision - making it irreplaceable in systems requiring coordinated power fail response, memory retention, and firmware health monitoring.

Availability

ADM696AN is available at Aetrix Electronics and suitable for industrial controllers, automotive telematics modules, medical infusion pumps, and ruggedized handheld terminals requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long-term lifecycle continuity.

Supply support for ADM696AN 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and reliable power management.

The ADM696AN belongs to Analog Devices' microprocessor supervisory circuit product line, designed specifically to consolidate power monitoring, battery backup control, and watchdog supervision into a single IC for mission-critical embedded systems operating in harsh environments.

FAQ

What is the guaranteed minimum VCC voltage at which ADM696AN asserts RESET?

The ADM696AN guarantees RESET assertion down to VCC = 1 V, with RESET output voltage ≤200 mV at ISINK = 10 µA. This ensures reliable microprocessor hold during deep brownout conditions where other supervisors may release reset prematurely. The internal reset generator remains fully functional across the entire 1 V to 5.5 V VCC range, making ADM696AN suitable for ultra-low-voltage recovery scenarios not supported by most competing supervisory ICs.

How does ADM696AN handle battery switchover during gradual VCC decay?

ADM696AN uses asymmetric thresholds: VCC must exceed VBATT by 70 mV to switch VOUT to VCC (power-up), and VCC must fall 50 mV below VBATT to switch to battery (power-down), creating 20 mV hysteresis. This prevents oscillation during slow rail decay. In battery backup mode, VOUT = VBATT – 0.02 V at 250 µA, and supply current drops to 1 µA max - confirmed in Table "ADM696/ADM697–SPECIFICATIONS" under "Supply Current in Battery Backup Mode".

Can ADM696AN's watchdog timer be disabled in-circuit without hardware modification?

Yes - the ADM696AN watchdog timer disables automatically when WDI is left floating or driven to midsupply (~VCC/2). This occurs because WDI is a three-level input with internal bias at 38% of VCC and ~125 kΩ impedance; floating or mid-rail states prevent valid transitions, halting timer counting. No external pull-up/down resistors are required, and the feature is explicitly documented in the "PIN FUNCTION DESCRIPTION" section for WDI.

What is the maximum continuous output current ADM696AN can deliver from VOUT in normal operation?

The ADM696AN delivers up to 100 mA continuously from VOUT with VCC – VOUT dropout ≤0.25 V (typical 0.025 V at 1 mA). This is specified in the "BATTERY BACKUP SWITCHING (ADM696)" section of the datasheet under "VOUT Output Voltage" with test condition "IOUT ≤ 100 mA". Exceeding 100 mA requires external PNP transistor driven by BATT ON, as detailed in Figure 14 and "Increasing the Drive Current" application note.

Does ADM696AN provide separate active-high and active-low reset outputs?

Yes - ADM696AN provides both RESET (pin 15, active-low) and RESET (pin 16, active-high) outputs. These are complementary signals generated from the same internal reset latch. RESET remains valid down to VCC = 1 V, while RESET sources 1 µA at 3.5 V (VCC = 5 V), enabling direct interface with processors requiring either polarity - a key differentiator from single-output supervisors like TPS3823.