Analog Devices Inc. ADM6319C29ARJZ-RL7

Overview

ADM6319C29ARJZ-RL7 from Analog Devices is a supervisory circuit with manual reset and dual push-pull reset outputs, designed for microprocessor supply voltage monitoring. It features a 2.93 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, no watchdog timer, and operates down to VCC = 1 V with 5 µA typical supply current. It is used in portable controllers where reliable power-on reset and user-initiated recovery are required.

For engineers reviewing the ADM6319C29ARJZ-RL7 datasheet, ADM6319C29ARJZ-RL7 pinout, ADM6319C29ARJZ-RL7 application, or ADM6319C29ARJZ-RL7 equivalent, key selection criteria include reset threshold accuracy, guaranteed reset validity at low VCC, dual active-low/active-high output drive capability, industrial temperature support, and absence of watchdog functionality.

Technical Context

The ADM6319C29ARJZ-RL7 implements a precision bandgap-based voltage reference and comparator to monitor VCC against a factory-trimmed 2.93 V threshold. Its dual push-pull RESET and RESET outputs are asserted simultaneously when VCC falls below VTH or when the manual reset (MR) input is pulled low for ≥1 µs.

Reset remains asserted for ≥140 ms after VCC rises above VTH or MR returns high, ensuring stable processor initialization. The device guarantees valid logic levels on both outputs down to VCC = 1 V, with internal 52 kΩ MR pull-up and glitch rejection on MR input (100 ns typical).

Key Specifications

Pinout & Package

ADM6319C29ARJZ-RL7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 1.3 mm × 2.9 mm footprint and 1.15 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6319C29ARJZ-RL7, ADM6319C31ARJZ-RL7 offers higher reset threshold for improved noise margin, while TPS3808G33DBVR reduces feature set to lower cost and complexity but sacrifices MR support and dual-output drive strength.

Availability

ADM6319C29ARJZ-RL7 is available at Aetrix Electronics and suitable for industrial controller monitoring, portable medical instrument design, and smart energy meter development requiring stable component supply and long-term lifecycle support.

Supply support for ADM6319C29ARJZ-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 specifically for robust microprocessor supervision in resource-constrained embedded systems, emphasizing low power, guaranteed reset validity at ultra-low VCC, and integrated manual reset functionality.

FAQ

What is the reset threshold voltage of the ADM6319C29ARJZ-RL7?

The ADM6319C29ARJZ-RL7 has a factory-trimmed reset threshold of 2.93 V, with ±2.5% tolerance over the full industrial temperature range (−40°C to +85°C). This value is confirmed in Table 5 of the Rev. I datasheet and matches the "29" suffix in the part number, corresponding to the 29th entry in the 26-step 2.5 V–5.0 V threshold ladder.

Does the ADM6319C29ARJZ-RL7 include a watchdog timer?

No, the ADM6319C29ARJZ-RL7 does not include a watchdog timer. Per Table 1 and the Ordering Guide, ADM6319 variants are defined by "No" watchdog input. The "C" in the part number denotes 140 ms reset timeout, and "29" specifies the 2.93 V threshold; absence of W/X/Y/Z suffix confirms no watchdog function.

What are the functions of pins 1 and 3 on the ADM6319C29ARJZ-RL7?

Pin 1 is the active-low RESET output, and pin 3 is the active-high RESET output - both are push-pull and asserted simultaneously during VCC undervoltage or MR activation. This dual-output architecture is unique to ADM6318/ADM6319/ADM6321/ADM6322 and enables direct interface to diverse microcontroller reset inputs without level-shifting.

What is the minimum pulse width required on the MR input of the ADM6319C29ARJZ-RL7?

The MR input of the ADM6319C29ARJZ-RL7 requires a minimum low pulse width of 1 µs to trigger a reset, as specified in Table 2 under "MR Input Pulse Width". This is supported by Figure 15, which shows pulse width remains ≤1 µs across −40°C to +85°C, and by functional description stating MR is debounced on-chip.

Is the ADM6319C29ARJZ-RL7 compatible with 1.8 V microcontrollers?

Yes, the ADM6319C29ARJZ-RL7 guarantees valid RESET and RESET output logic levels down to VCC = 1 V, making it compatible with 1.8 V systems when powered from that rail. However, its 2.93 V reset threshold means it will assert reset only when the monitored 1.8 V rail drops far below specification - so it is typically used to supervise 3.3 V rails, not 1.8 V.