Analog Devices Inc. ADM6320CW33ARJZ-R7

Overview

ADM6320CW33ARJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, configured for 3.3 V supply monitoring, 140 ms minimum reset timeout, and 102 ms typical watchdog timeout. It features open-drain active-low RESET output, operates over −40°C to +85°C, and consumes ≤12 µA at 3.6 V - used in microprocessor-based embedded systems requiring reliable power-on reset and code execution integrity monitoring.

For engineers reviewing the ADM6320CW33ARJZ-R7 datasheet, ADM6320CW33ARJZ-R7 pinout, ADM6320CW33ARJZ-R7 application, or ADM6320CW33ARJZ-R7 equivalent, key selection criteria include its 3.3 V reset threshold accuracy (±2.5% over temperature), open-drain output compatibility with mixed-voltage logic interfaces, industrial-grade glitch immunity, and SOT-23 footprint suitability for space-constrained portable designs.

Technical Context

The ADM6320CW33ARJZ-R7 implements a precision voltage reference comparator with 3.3 V nominal reset threshold (VTH = 3.3 V, ±2.5% over −40°C to +85°C) and 3 mV hysteresis, paired with independent reset and watchdog timing circuits. Its open-drain RESET output requires an external pull-up and remains valid down to VCC = 1 V, enabling robust reset assertion during brownout conditions.

Watchdog functionality is triggered by logic transitions on WDI; the 102 ms typical timeout (ADM6320C-series with X suffix) clears on any low-to-high or high-to-low edge ≥50 ns, and resets the microprocessor if unattended. Manual reset via MR pin (52 kΩ internal pull-up, 1 µs minimum pulse width) provides hardware-initiated recovery independent of supply or watchdog state.

Key Specifications

Pinout & Package

ADM6320CW33ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.8–3.0 mm body length. The compact footprint supports high-density PCB layouts in portable and embedded applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UR33+T and TPS3808G33DBVR, ADM6320CW33ARJZ-R7 uniquely combines 3.3 V supervision, open-drain output, integrated watchdog timer, and manual reset in a single 5-pin SOT-23 - reducing BOM count and PCB area while enabling autonomous recovery from both power and software faults.

Availability

ADM6320CW33ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive telematics modules, and smart energy meters requiring stable component supply across extended product lifecycles.

Supply support for ADM6320CW33ARJZ-R7 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM63xx family was designed specifically for microprocessor-based systems needing guaranteed power-on reset, brownout protection, and autonomous code-execution monitoring - targeting industrial, medical, and automotive applications demanding high reliability and low power.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6320CW33ARJZ-R7?

The ADM6320CW33ARJZ-R7 has a nominal reset threshold of 3.3 V, with a tolerance of ±2.5% over the full industrial temperature range (−40°C to +85°C). At 25°C, the threshold is specified as 3.3 V ±1.5%, ensuring precise detection of 3.3 V supply deviations without external trimming components.

Does ADM6320CW33ARJZ-R7 require an external pull-up resistor on the RESET pin?

Yes, ADM6320CW33ARJZ-R7 features an open-drain active-low RESET output and requires an external pull-up resistor to define the high logic level. A 10 kΩ resistor to a compatible voltage rail (≤6 V) is recommended for most applications, ensuring proper interfacing with downstream 3.3 V or 5 V logic inputs.

What is the watchdog timeout period for ADM6320CW33ARJZ-R7, and how is it cleared?

The ADM6320CW33ARJZ-R7 has a typical watchdog timeout of 102 ms (X-suffix). It is cleared on any logic transition - low-to-high or high-to-low - on the WDI pin lasting ≥50 ns. The timer also resets automatically when a VCC undervoltage or MR-initiated reset occurs.

Can ADM6320CW33ARJZ-R7 operate reliably below 1.8 V supply voltage?

Yes, ADM6320CW33ARJZ-R7 is fully functional down to VCC = 1 V, with guaranteed RESET output validity and accurate threshold detection. This enables use in ultra-low-power systems, backup power domains, and brownout recovery circuits where supply may dip below standard logic thresholds.

How does the manual reset (MR) pin behave when left unconnected?

When left unconnected, the MR pin of ADM6320CW33ARJZ-R7 is pulled high internally by a 52 kΩ resistor, disabling manual reset assertion. No external pull-up is needed. Driving MR low for ≥1 µs initiates a reset, and the internal debounce rejects noise spikes ≤100 ns, enhancing system robustness.