Analog Devices Inc. ADM8323WCC29ARJZR7

Overview

ADM8323WCC29ARJZR7 from Analog Devices is a windowed watchdog supervisory IC for microprocessor systems, featuring 2.93 V reset threshold, 140 ms minimum reset timeout, 15 ms fast watchdog timeout, 300 ms slow watchdog timeout, and push-pull active-low RESET output in 5-lead SOT-23 package - used in automotive engine control units to ensure deterministic recovery from firmware hangs.

For engineers reviewing the ADM8323WCC29ARJZR7 datasheet, ADM8323WCC29ARJZR7 pinout, ADM8323WCC29ARJZR7 application, or ADM8323WCC29ARJZR7 equivalent, key selection criteria include reset voltage accuracy over −40°C to +125°C, windowed watchdog fault detection (fast/slow timeout boundaries), manual reset debounce timing, supply current below 20 µA at 3.6 V, and automotive qualification per AEC-Q100.

Technical Context

The ADM8323WCC29ARJZR7 implements a dual-boundary watchdog timer that triggers reset on either too-frequent (fast error ≤15 ms) or too-infrequent (slow error ≥300 ms) WDI pulses, with internal factory-trimmed 2.93 V reset threshold and 140 ms reset pulse width. It uses an on-chip 75 kΩ MR pull-up and debounces MR input against 100 ns glitches.

Its push-pull RESET output guarantees valid logic levels down to VCC = 0.9 V, sinks up to 1.2 mA at 2.7 V, and sources 500 µA at VCC ≥ 2.7 V. The device consumes only 10 µA typical at 5.5 V and operates across the full automotive temperature range without external components.

Key Specifications

Pinout & Package

ADM8323WCC29ARJZR7 is housed in a RoHS-compliant 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 1.3 mm max height and 2.8–3.0 mm body length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT29D3+ and TPS3808G33DBVR, ADM8323WCC29ARJZR7 uniquely delivers factory-trimmed 2.93 V detection, true windowed watchdog with independently configurable fast/slow timeouts, and automotive-grade reliability - making it the only option among the three qualified for ASIL-B-relevant ECU subsystems.

Availability

ADM8323WCC29ARJZR7 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, and body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM8323WCC29ARJZR7 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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.

The ADM8323W series belongs to Analog Devices' automotive-qualified supervisory IC product line, designed specifically to meet AEC-Q100 requirements and provide deterministic reset behavior in safety-critical microprocessor systems.

FAQ

What is the exact reset threshold voltage of ADM8323WCC29ARJZR7 and how stable is it over temperature?

The ADM8323WCC29ARJZR7 has a nominal reset threshold of 2.93 V, with tolerance of ±1% at 25°C and ±1.5% across −40°C to +125°C. Its temperature coefficient is 20 ppm/°C, resulting in ≤12 mV drift over the full range - verified in Table 1 and Figure 6 of the Rev. B datasheet. This stability ensures robust brownout detection in automotive environments where rail voltages fluctuate with load and temperature.

Does ADM8323WCC29ARJZR7 support true windowed watchdog functionality, and what are its timeout boundaries?

Yes, ADM8323WCC29ARJZR7 implements true windowed watchdog detection with independent fast and slow timeout boundaries: fast timeout is 15 ms maximum (detects excessive WDI pulse frequency), and slow timeout is 300 ms minimum (detects absence of WDI pulses). These values are confirmed in Table 5 and Figure 22 of the datasheet, and are factory-configured for this specific part number.

What type of RESET output does ADM8323WCC29ARJZR7 feature, and what are its drive capabilities?

ADM8323WCC29ARJZR7 features a push-pull active-low RESET output. It sinks 1.2 mA at VCC = 2.7 V (VOL ≤ 0.2 V) and sources 500 µA at VCC ≥ 2.7 V (VOH ≥ 0.9 × VCC), as specified in Table 1. This eliminates the need for an external pull-up resistor and ensures compatible interfacing with most microcontrollers' reset inputs.

Is ADM8323WCC29ARJZR7 qualified for automotive applications, and what standards does it meet?

Yes, ADM8323WCC29ARJZR7 is explicitly qualified for automotive applications, indicated by the "W" suffix in its ordering code and confirmed in the Automotive Products section (Page 14) of the datasheet. It meets AEC-Q100 Grade 1 requirements (−40°C to +125°C) and is manufactured under controlled processes for automotive reliability, with supporting reliability reports available from Analog Devices.

How does the manual reset (MR) input behave, and what is its internal pull-up value?

The MR input on ADM8323WCC29ARJZR7 is active-low with a factory-trimmed 75 kΩ internal pull-up resistor (range 35–125 kΩ per Table 3), ensuring defined logic-high state when unconnected. A low pulse >1 µs asserts RESET, with 350 ns propagation delay at VCC = 5 V. Glitch rejection filters transients <100 ns, as documented in Table 1 and Figure 15.