Analog Devices Inc. ADM6322C46ARJ-RL7

Overview

ADM6322C46ARJ-RL7 from Analog Devices is a supervisory circuit with manual reset input and open-drain active-low reset output, designed for microprocessor supply voltage monitoring. It features a 4.63 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, and operates from 1 V to 5.5 V supply. Used in embedded controllers and portable instrumentation to ensure reliable power-on reset and brownout recovery.

For engineers reviewing the ADM6322C46ARJ-RL7 datasheet, ADM6322C46ARJ-RL7 pinout, ADM6322C46ARJ-RL7 application, or ADM6322C46ARJ-RL7 equivalent, key selection criteria include its open-drain RESET output requiring external pull-up, absence of watchdog functionality, manual reset input with internal 52 kΩ pull-up, and guaranteed reset validity down to VCC = 1 V.

Technical Context

The ADM6322C46ARJ-RL7 implements a precision voltage monitor with hysteresis (3 mV) and temperature coefficient of 40 ppm/°C, ensuring stable reset assertion across industrial temperatures. Its reset generator guarantees valid output down to VCC = 1 V and provides glitch immunity against fast transients (e.g., 100 mV overdrive rejected for ≤8 µs at VTH = 2.93 V).

Unlike watchdog-equipped variants, ADM6322C46ARJ-RL7 omits WDI functionality and instead provides dedicated MR input with 1 µs minimum pulse width and 100 ns glitch rejection. The open-drain RESET output requires an external pull-up resistor (typically 10 kΩ) to a rail ≤6 V, enabling level-shifting and wired-OR configurations.

Key Specifications

Pinout & Package

ADM6322C46ARJ-RL7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.80–3.00 mm body length. Pin 1 is RESET (active-low open-drain), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC (monitored supply), and Pin 5 is unused (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6319C46ARJZ-RL7, ADM6322C46ARJ-RL7 offers open-drain flexibility at the cost of one external resistor; compared with TPS3808G33DBVR, it supports wider VCC range, includes MR, and consumes less current but targets 4.63 V systems rather than 3.3 V.

Availability

ADM6322C46ARJ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical portable monitors, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM6322C46ARJ-RL7 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 engineered for robust power-supply supervision in microprocessor-based systems, emphasizing precision threshold accuracy, ultra-low power, and industrial temperature reliability - specifically targeting embedded control and portable instrumentation.

FAQ

What is the reset threshold voltage of the ADM6322C46ARJ-RL7?

The ADM6322C46ARJ-RL7 has a nominal reset threshold voltage of 4.63 V, with tolerance of ±2.5% over the full industrial temperature range (−40°C to +85°C). This value is confirmed in Table 5 of the Rev. I datasheet and corresponds to Reset Threshold Number 46. The part is calibrated to assert RESET when VCC falls below this threshold and maintain it for at least 140 ms after VCC rises above it.

Does the ADM6322C46ARJ-RL7 include a watchdog timer?

No, the ADM6322C46ARJ-RL7 does not include a watchdog timer. Per Table 1 and the Device Model Options section, ADM6322 variants are defined by "No Watchdog / Yes Manual Reset / Open-drain Push-pull" configuration. The absence of WDI pin functionality is confirmed in Figure 6 (pinout) and Section "Circuit Description", which explicitly states ADM6322 lacks watchdog input circuitry.

What is the function of Pin 5 on the ADM6322C46ARJ-RL7?

Pin 5 on the ADM6322C46ARJ-RL7 is a no-connect (NC) terminal - it is not bonded internally and serves no electrical function. As stated in Table 4 and Figure 6 of the datasheet, Pin 5 must be left unconnected or tied to GND per PCB layout best practices; routing or terminating it to any active net may compromise reliability or violate JEDEC SOT-23 mechanical specifications.

What external components are required for proper operation of the ADM6322C46ARJ-RL7?

The ADM6322C46ARJ-RL7 requires an external pull-up resistor on the open-drain RESET pin (typically 10 kΩ to VCC or another logic rail ≤6 V) and a 0.1 µF bypass capacitor between VCC and GND placed near the device. No external components are needed for the MR input due to its internal 52 kΩ pull-up. These requirements are specified in the "Open-Drain RESET Output" and "Applications Information" sections of the datasheet.

Is the ADM6322C46ARJ-RL7 RoHS compliant and what is its packaging format?

Yes, the ADM6322C46ARJ-RL7 is RoHS compliant, as indicated by the "Z" suffix in its ordering code and confirmed in the Ordering Guide (Page 13). It is supplied in a 5-lead SOT-23 package (JEDEC MO-178-AA, package code RJ-5) on a 3,000-piece tape-and-reel (RL7 designation), with moisture sensitivity level (MSL) 1 and lead finish matte tin.