Analog Devices Inc. ADM8323WCC46ARJZR7

Overview

ADM8323WCC46ARJZR7 from Analog Devices is a windowed watchdog supervisory IC for automotive microprocessor systems, featuring 4.63 V reset threshold, 140 ms minimum reset timeout, 15 ms fast watchdog timeout, −40°C to +125°C operation, and push-pull RESET output in 5-lead SOT-23 package. It monitors VCC integrity and code execution, asserting reset on undervoltage, manual reset, or watchdog window violation.

For engineers reviewing the ADM8323WCC46ARJZR7 datasheet, ADM8323WCC46ARJZR7 pinout, ADM8323WCC46ARJZR7 application, or ADM8323WCC46ARJZR7 equivalent, this page delivers verified circuit role, exact reset/watchdog timing values, automotive-grade thermal and voltage specifications, and validated alternative options for system-level reliability design.

Technical Context

The ADM8323WCC46ARJZR7 implements a dual-fault windowed watchdog architecture: it triggers reset if WDI pulses occur too rapidly (fast fault, min 15 ms) or too slowly (slow fault, min 300 ms), ensuring robust detection of both stuck and stalled microprocessor states. Its internal voltage divider precisely sets 4.63 V reset threshold with ±1.5% tolerance over temperature.

This device integrates a 75 kΩ internal MR pull-up, glitch-filtered manual reset input, and push-pull RESET output guaranteed functional down to VCC = 0.9 V. Supply current remains ≤20 µA across full temperature range, enabling use in always-on automotive subsystems.

Key Specifications

Pinout & Package

Package: 5-lead SOT-23 (RJ-5), JEDEC MO-178-AA compliant, RoHS-compliant, 1.90 mm × 2.95 mm footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM8323WCC46ARJZR7, ADM8324WCA46ARJZR7 trades push-pull drive strength for wiring flexibility, while TPS3808G33DBVR reduces complexity and current draw at the expense of fault-detection granularity - making ADM8323WCC46ARJZR7 optimal for high-integrity automotive MCU supervision.

Availability

ADM8323WCC46ARJZR7 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS domain controllers, and infotainment head units requiring stable component supply with AEC-Q100 qualification and extended temperature support.

Supply support for ADM8323WCC46ARJZR7 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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.

The ADM8323/ADM8324 product line is designed specifically for automotive and industrial microprocessor supervision, delivering windowed watchdog functionality, wide-temperature operation, and factory-trimmed reset thresholds to replace discrete reset ICs and simplify system-level reliability design.

FAQ

What is the exact reset threshold voltage of ADM8323WCC46ARJZR7 and how does it vary with temperature?

The ADM8323WCC46ARJZR7 has a nominal reset threshold of 4.63 V at 25°C, with tolerance of ±1.5% over the full −40°C to +125°C range (4.56 V to 4.70 V). This value is factory-trimmed using an internal voltage divider and includes 2.5 × VTH ≈ 11.6 mV hysteresis to prevent chatter near the trip point. The temperature coefficient is 20 ppm/°C, resulting in <0.5% drift across the operating range - confirmed in Figure 6 of the Rev. B datasheet.

Does ADM8323WCC46ARJZR7 support windowed watchdog functionality, and what are its timeout values?

Yes, ADM8323WCC46ARJZR7 implements true windowed watchdog supervision with independent fast and slow timeout windows. For this specific variant, fast timeout is 15 ms (typical) and slow timeout is 300 ms (minimum), per Table 5 Option C. A reset is asserted if WDI pulses fall outside this window - either too close together (<15 ms) or too far apart (>300 ms) - enabling detection of both runaway loops and complete firmware stalls.

What is the RESET output configuration of ADM8323WCC46ARJZR7 and what drive capability does it provide?

ADM8323WCC46ARJZR7 features a push-pull RESET output (pin 1), not open-drain. It guarantees VOL ≤ 0.2 V at ISINK = 1.2 mA when VCC ≥ 2.7 V, and VOH ≥ 0.9 × VCC at ISOURCE = 500 µA. This eliminates the need for external pull-up resistors and allows direct interfacing with standard CMOS reset inputs across its full 0.9 V to 5.5 V VCC range - a key differentiator from the ADM8324 series.

Is ADM8323WCC46ARJZR7 qualified for automotive applications, and what standards does it meet?

Yes, ADM8323WCC46ARJZR7 is explicitly qualified for automotive use, indicated by the "W" suffix in its ordering code. It meets AEC-Q100 Grade 1 requirements (−40°C to +125°C), undergoes controlled manufacturing, and is documented in the "Automotive Products" section (Page 14) of the Rev. B datasheet. It is intended for safety-critical ECUs, ADAS, and body electronics where reliability under harsh environmental stress is mandatory.

What are the key differences between ADM8323WCC46ARJZR7 and ADM8324WCA46ARJZR7?

Both share the same 4.63 V reset threshold and 140 ms reset timeout, but ADM8323WCC46ARJZR7 uses a push-pull RESET output and 15 ms fast watchdog timeout, whereas ADM8324WCA46ARJZR7 uses an open-drain RESET output and 1.5 ms fast watchdog timeout. The former enables direct drive of CMOS inputs; the latter requires an external pull-up and offers faster fault detection - making them functionally distinct, not drop-in replacements.