Analog Devices Inc. ADM6322C29ARJZ-RL7

Overview

ADM6322C29ARJZ-RL7 from Analog Devices is a supervisory circuit with manual reset input and open-drain active-low reset output, designed for microprocessor voltage monitoring. It features a 2.93 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and low 5 µA supply current. It is used in portable embedded systems requiring reliable power-on and brownout reset signaling.

For engineers reviewing the ADM6322C29ARJZ-RL7 datasheet, ADM6322C29ARJZ-RL7 pinout, ADM6322C29ARJZ-RL7 application, or ADM6322C29ARJZ-RL7 equivalent, key selection criteria include its absence of watchdog functionality, open-drain RESET output requiring external pull-up, manual reset input with 52 kΩ internal pull-up, and compatibility with industrial-temperature microcontroller power rails.

Technical Context

The ADM6322C29ARJZ-RL7 implements a precision bandgap-based voltage detector with 2.93 V threshold and 3 mV hysteresis, coupled to a fixed 140 ms reset timeout timer. Its open-drain RESET output is asserted low when VCC falls below threshold or MR is pulled low, and remains asserted for the full timeout after recovery or MR release.

It includes integrated MR input debouncing, 100 ns glitch rejection, and operates across VCC = 1 V to 5.5 V. Unlike ADM6316/ADM6320 variants, it omits watchdog circuitry entirely - confirmed by "N/A" in Table 9 and device selection Table 1 - making it suitable for systems where software-level watchdog supervision is handled externally or not required.

Key Specifications

Pinout & Package

ADM6322C29ARJZ-RL7 is housed in a 5-lead SOT-23 (RJ-5) package, measuring 2.9 mm × 1.6 mm × 1.1 mm, with gull-wing leads and RoHS-compliant finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6322C29ARJZ-RL7, ADM6319C29ARJZ-RL7 offers simplified interface via push-pull output but forfeits voltage-level flexibility, while TPS3808G33DBVR reduces supply current by ~70% but removes the integrated manual reset function entirely - impacting field serviceability.

Availability

ADM6322C29ARJZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld monitors, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM6322C29ARJZ-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, serving industrial, communications, automotive, and healthcare markets since 1965.

The ADM63xx family was engineered specifically for robust, low-power microprocessor supervision in space-constrained embedded systems - emphasizing precision threshold accuracy, wide VCC range, and industrial-grade reliability without integrated watchdog overhead.

FAQ

What is the reset threshold voltage of the ADM6322C29ARJZ-RL7 and how stable is it over temperature?

The ADM6322C29ARJZ-RL7 has a nominal reset threshold of 2.93 V, specified with ±2.5% tolerance over the full industrial temperature range (−40°C to +85°C). Its temperature coefficient is 40 ppm/°C, resulting in ≤14 mV total drift across the range. This stability ensures consistent brownout detection for 3.3 V systems even under thermal stress, as verified in Table 2 and Figure 8 of the Rev. K datasheet.

Does the ADM6322C29ARJZ-RL7 include a watchdog timer function?

No, the ADM6322C29ARJZ-RL7 does not include a watchdog timer. Per Table 1 (device selection matrix) and Table 9 (watchdog timeout column showing "N/A"), ADM6322 is explicitly defined as the variant with manual reset and no watchdog input. This distinguishes it from ADM6316/ADM6320 and makes it appropriate for systems where code execution integrity is managed externally.

What is the function of Pin 4 on the ADM6322C29ARJZ-RL7?

Pin 4 on the ADM6322C29ARJZ-RL7 is a no-connect (NC) terminal. As confirmed in Figure 5 (ADM6319/ADM6322 pin configuration) and Table 4 of the datasheet, this pin is internally unconnected and must be left floating on the PCB. Routing or soldering to Pin 4 may cause functional or reliability issues.

How does the manual reset (MR) input on the ADM6322C29ARJZ-RL7 behave during power-up?

The MR input on the ADM6322C29ARJZ-RL7 features a 52 kΩ internal pull-up resistor, ensuring it defaults to logic high when unconnected. During power-up, MR remains inactive unless externally pulled low for ≥1 µs. Its 230 ns MR-to-reset delay (at VCC = 5 V) and 100 ns glitch rejection prevent false triggers from switch bounce or EMI, enabling reliable push-button reset initiation without external RC filtering.

What external components are required for proper operation of the ADM6322C29ARJZ-RL7?

The ADM6322C29ARJZ-RL7 requires only an external pull-up resistor on the open-drain RESET pin (Pin 1), typically 4.7 kΩ to 10 kΩ connected to the target MCU's reset rail voltage (e.g., 1.8 V or 3.3 V). No external components are needed for MR (internal 52 kΩ pull-up) or VCC (bypass capacitor recommended but not mandatory per datasheet Figure 20). A 0.1 µF ceramic capacitor between VCC and GND is advised for transient immunity.