Analog Devices Inc. ADM8693ARN

Overview

ADM8693ARN from Analog Devices is a 16-lead TSSOP microprocessor supervisory circuit providing precision reset generation (4.4 V threshold), adjustable watchdog timeout (100 ms / 1.6 s / external), battery backup switchover (0.7 Ω on-resistance, 100 mA VOUT drive), CE gating (3 ns propagation), and power-fail detection (1.3 V PFI comparator) for embedded industrial control systems.

For engineers reviewing the ADM8693ARN datasheet, ADM8693ARN pinout, ADM8693ARN application, or ADM8693ARN equivalent, this page delivers verified functional specifications, validated pin roles, confirmed TSSOP-16 package mapping, real-world use cases in battery-backed controllers and automotive ECUs, and two technically documented alternative parts with explicit differences in reset threshold and watchdog configurability.

Technical Context

The ADM8693ARN integrates a precision 4.4 V reset voltage detector with 40 mV hysteresis, an internally biased three-level WDI input supporting watchdog timeout selection via OSC SEL/OSC IN, and dual-mode oscillator control enabling fixed or capacitor-adjusted timing. Its battery switchover circuit uses PMOS/NMOS switching with 70 mV power-up and 50 mV power-down thresholds and 20 mV hysteresis.

It provides separate logic outputs: active-low RESET, active-high LOW LINE, open-drain WDO, push-pull BATT ON, and gated CEOUT with 3 ns propagation delay. The PFI comparator operates independently with 1.3 V reference and nanosecond-scale response, while VOUT sustains operation down to 1 V VCC with guaranteed reset assertion.

Key Specifications

Pinout & Package

ADM8693ARN is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal enhancement. Pin 1 marked by dot; pin count and layout match JEDEC MO-153 standard.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM8691ARN, ADM8693ARN offers lower reset threshold for wider 5 V supply tolerance, while versus MAX693CPE+, it adds five critical functions-adjustable watchdog, CE gating, PFI/PFO, BATT ON, and WDO-in the same footprint, enabling single-chip supervision without design compromises.

Availability

ADM8693ARN 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, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.

Supply support for ADM8693ARN 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, and memory protection into a single IC to replace discrete solutions in space-constrained embedded applications.

FAQ

What is the guaranteed reset voltage threshold for ADM8693ARN?

The ADM8693ARN has a guaranteed reset voltage threshold of 4.25 V minimum and 4.48 V maximum, with typical value 4.4 V. This 4.4 V threshold is optimized for compatibility with 5 V ±10% power supplies. The 40 mV hysteresis prevents chatter during slow VCC transitions. All values are tested and specified over −40°C to +85°C industrial temperature range per the Rev. B datasheet.

Does ADM8693ARN support adjustable watchdog timeout, and how is it configured?

Yes, ADM8693ARN supports adjustable watchdog timeout via OSC SEL and OSC IN pins. With OSC SEL low, an external capacitor on OSC IN sets timeout (e.g., 47 pF → 1.6 s); with OSC SEL high/floating, OSC IN selects between fixed 100 ms (low) or 1.6 s (high/floating). The long timeout (1.6 s) is always enforced immediately after reset to ensure safe MCU initialization before short-period operation begins.

Can ADM8693ARN drive CMOS RAM directly without external components?

Yes, ADM8693ARN can drive CMOS RAM directly: its VOUT pin delivers up to 100 mA with ≤0.2 V dropout at full load, and CEOUT provides 3 ns-gated write protection. For peak transient currents >100 mA, a 0.1 µF bypass capacitor on VOUT is recommended. No external pass transistor or pull-up resistors are needed for standard SRAM/EEPROM interfacing.

What is the function of the BATT ON pin on ADM8693ARN?

The BATT ON pin on ADM8693ARN is a push-pull output that goes high when VBATT powers VOUT (i.e., during battery backup mode) and low when VCC powers VOUT. It sinks 35 mA and can directly drive the base of an external PNP transistor to boost VOUT current beyond 100 mA. This enables scalable backup power without redesigning the core supervisor interface.

How does ADM8693ARN handle power-fail detection and early warning?

ADM8693ARN uses its PFI input and internal 1.3 V reference to detect falling auxiliary voltages. When PFI drops below 1.3 V, PFO goes low - providing early warning before VCC reaches the 4.4 V reset threshold. Response time is under 1 µs (Figures 11–13), and PFO remains active even when VCC is below VBATT, ensuring continuous monitoring during battery-only operation.