Analog Devices Inc. ADM8693ANZ

Overview

ADM8693ANZ from Analog Devices is a 16-lead TSSOP microprocessor supervisory circuit providing precision reset generation (4.4 V threshold), adjustable reset and watchdog timeout, battery backup switchover, CE gating, and power-fail detection for 5 V systems. It asserts RESET down to 1 V VCC, delivers up to 100 mA from VOUT, and supports watchdog periods of 100 ms or 1.6 s - used in industrial controllers requiring reliable brownout recovery and RAM write protection.

For engineers reviewing the ADM8693ANZ datasheet, ADM8693ANZ pinout, ADM8693ANZ application, or ADM8693ANZ equivalent, key selection considerations include its 4.4 V reset threshold (vs. 4.65 V in ADM8691), dual watchdog timeout options, CEIN/CEOUT gating with 3 ns propagation delay, and TSSOP-16 package compatibility with space-constrained embedded designs.

Technical Context

The ADM8693ANZ integrates a precision 4.4 V reset comparator with 40 mV hysteresis, an internal oscillator selectable via OSC SEL, and a three-level WDI input that resets on any transition. Its battery switchover circuit activates BATT ON when VBATT > VCC + 70 mV (power-up) or VCC < VBATT − 50 mV (power-down), ensuring clean handover with 20 mV hysteresis.

It provides separate logic outputs: active-low RESET, active-high LOW LINE, open-drain PFO (1.3 V PFI threshold), push-pull WDO, and gated CEOUT synchronized to CEIN. The CE gating path forces CEOUT high during reset, preventing writes to battery-backed RAM when VCC is invalid.

Key Specifications

Pinout & Package

ADM8693ANZ is housed in a 16-lead TSSOP (RU-16) package, 5 mm × 4.4 mm, 0.65 mm pitch, thermally rated at θ_JA = 158°C/W. Pin functions are validated per Analog Devices Rev. B datasheet Figure 4 and Table 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM8691ANZ, ADM8693ANZ offers lower reset threshold for wider brownout coverage, while compared with MAX693ESA+, it adds critical CE gating, adjustable timing, and TSSOP-16 footprint - making ADM8693ANZ the only option meeting full functional safety and memory integrity requirements in modern embedded controllers.

Availability

ADM8693ANZ is available at Aetrix Electronics and suitable for industrial PLCs, automotive BCMs, smart energy meters, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM8693ANZ 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, headquartered in Norwood, MA, with design and manufacturing expertise spanning over 50 years.

The ADM869x family was designed specifically for microprocessor system supervision - integrating reset, watchdog, battery switchover, CE gating, and power-fail detection into a single IC to reduce board area and improve reliability in mission-critical embedded applications.

FAQ

What is the guaranteed reset voltage threshold range for ADM8693ANZ?

The ADM8693ANZ has a guaranteed reset voltage threshold range of 4.25 V to 4.48 V, with a nominal value of 4.4 V. This specification ensures reliable reset assertion across the full industrial temperature range (−40°C to +85°C) and matches 5 V ±10% power supplies. The 40 mV hysteresis prevents chatter during slow VCC transitions, and the threshold remains valid down to VCC = 1 V - a key capability confirmed in the Rev. B datasheet Absolute Maximum Ratings and Specifications tables.

Does ADM8693ANZ support adjustable watchdog timeout, and how is it configured?

Yes, ADM8693ANZ supports adjustable watchdog timeout via the OSC SEL and OSC IN pins. With OSC SEL high or floating, OSC IN selects between fixed 100 ms (low) or 1.6 s (high) timeouts. With OSC SEL low, an external capacitor on OSC IN sets timeout as 1.6 s × C/47 pF (long) or 400 ms × C/47 pF (short). This configurability is documented in Table 5 of the Rev. B datasheet and enables precise tuning for diverse firmware execution profiles without external components.

How does the CEIN/CEOUT gating function protect RAM in ADM8693ANZ?

The ADM8693ANZ forces CEOUT high whenever VCC falls below the 4.4 V reset threshold or during battery backup mode - regardless of CEIN state. This action disables writes to battery-backed CMOS RAM or EEPROM, preventing data corruption during power instability. With a 3 ns propagation delay, CEOUT preserves timing margins in high-speed memory interfaces. This behavior is explicitly defined in the "CE Gating and RAM Write Protection" section (Page 12) and Figure 21 of the Rev. B datasheet.

What is the maximum continuous output current from VOUT on ADM8693ANZ, and what is the associated voltage drop?

ADM8693ANZ delivers up to 100 mA continuously from VOUT with a maximum voltage drop of 0.2 V at full load (VCC − 0.2 V), as specified in the "BATTERY BACKUP SWITCHING" section of the Rev. B datasheet (Table 2). At light load (1 mA), dropout is only 2.5 mV. This low-dropout performance is enabled by an internal 0.7 Ω PMOS switch, eliminating the need for external pass transistors in most RAM backup applications.

Can ADM8693ANZ operate with lithium coin-cell batteries, and what is the backup supply current?

Yes, ADM8693ANZ supports lithium coin-cell batteries (2.0–4.0 V range) and draws only 0.4–1 µA in battery backup mode (VCC = 0 V, VBATT = 2.8 V), per Table 2 of the Rev. B datasheet. Its 10 nA typical charging current from VBATT is safe for lithium cells and compensates self-discharge, extending operational backup life to multi-year durations in infrequently powered systems like utility meters or security sensors.