Analog Devices Inc. ADM6320BX33ARJZ-R7

Overview

ADM6320BX33ARJZ-R7 from Analog Devices is a supervisory circuit with watchdog timer and manual reset, designed for microprocessor supply voltage monitoring and code execution integrity assurance. It features a 3.3 V reset threshold (±2.5% over −40°C to +85°C), 20 ms minimum reset timeout, 102 ms typical watchdog timeout, open-drain active-low RESET output, and operates from 1 V to 5.5 V supply. It is used in embedded controllers where reliable power-on reset and fault recovery are critical.

For engineers reviewing the ADM6320BX33ARJZ-R7 datasheet, ADM6320BX33ARJZ-R7 pinout, ADM6320BX33ARJZ-R7 application, or ADM6320BX33ARJZ-R7 equivalent, key selection criteria include its open-drain reset configuration, industrial temperature range, low 5 µA typical supply current, and compatibility with 3.3 V logic systems requiring glitch-immune brownout detection.

Technical Context

The ADM6320BX33ARJZ-R7 integrates a precision voltage reference, reset generator, watchdog detector with debounce, and open-drain output stage. Its reset threshold is factory-trimmed to 3.3 V with ±2.5% tolerance across −40°C to +85°C and 40 ppm/°C temperature coefficient.

It asserts RESET when VCC falls below 3.3 V, when MR is pulsed low ≥1 µs, or when WDI fails to toggle within 102 ms (typical); RESET remains active for ≥20 ms after recovery. The open-drain output requires an external pull-up and guarantees valid logic low down to VCC = 1 V.

Key Specifications

Pinout & Package

ADM6320BX33ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 1.9 mm × 2.9 mm footprint and 1.3 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320XR33D3+T and TPS3808G33DBVR, the ADM6320BX33ARJZ-R7 uniquely combines open-drain flexibility, ultra-low 5 µA supply current, and precise 102 ms watchdog timing - making it optimal for power-sensitive, multi-rail embedded systems requiring wired-OR reset arbitration.

Availability

ADM6320BX33ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply and long-term lifecycle support.

Supply support for ADM6320BX33ARJZ-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 is engineered for microprocessor-based systems needing reliable power supervision and autonomous fault recovery - targeting industrial automation, portable instrumentation, and automotive electronics where deterministic reset behavior is non-negotiable.

FAQ

What is the exact reset threshold voltage of the ADM6320BX33ARJZ-R7 and how does it vary with temperature?

The ADM6320BX33ARJZ-R7 has a nominal reset threshold of 3.3 V, with ±2.5% tolerance over the full industrial temperature range (−40°C to +85°C). Its temperature coefficient is 40 ppm/°C, meaning the threshold drifts by approximately ±0.013 V across the operating range. This precision is factory-trimmed and specified in Table 2 of the Rev. I datasheet.

Does the ADM6320BX33ARJZ-R7 require an external pull-up resistor on the RESET pin, and what value is recommended?

Yes, the ADM6320BX33ARJZ-R7 features an open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the target logic rail (≤6 V) is recommended for most applications, as stated in the "Open-Drain RESET Output" section. This ensures proper logic-high levels while limiting current draw during reset assertion.

Can the watchdog timer in the ADM6320BX33ARJZ-R7 be disabled, and if so, how?

Yes, the watchdog timer in the ADM6320BX33ARJZ-R7 can be disabled by leaving the WDI pin unconnected (floating). As described in the "Watchdog Input" section, a window comparator disconnects the watchdog timer from the reset circuitry when WDI is floating, preventing timeout-induced resets while retaining voltage supervision functionality.

What is the minimum pulse width required on the MR pin to trigger a reset in the ADM6320BX33ARJZ-R7?

The ADM6320BX33ARJZ-R7 requires a minimum MR pulse width of 1 µs to reliably assert reset, as specified in Table 2 under "MR Input Pulse Width". This is guaranteed across the full temperature range and is supported by on-chip debounce circuitry that rejects glitches shorter than 100 ns.

Is the ADM6320BX33ARJZ-R7 RoHS compliant and what packaging format is supplied?

Yes, the ADM6320BX33ARJZ-R7 is RoHS compliant (denoted by the "Z" suffix) and supplied in a 3,000-piece 5-lead SOT-23 tape-and-reel format (RJ-5 package), as confirmed in the Ordering Guide and Figure 22 of the Rev. I datasheet.