Analog Devices Inc. ADM6318CY29ARJZ-R7

Overview

ADM6318CY29ARJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and dual active-low/active-high push-pull reset outputs, designed for microprocessor power supply monitoring. It features a 2.93 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, and consumes only 5–12 µA across 1.0–3.6 V VCC. It operates in industrial temperature range and supports brownout detection in portable embedded systems.

For engineers reviewing the ADM6318CY29ARJZ-R7 datasheet, ADM6318CY29ARJZ-R7 pinout, ADM6318CY29ARJZ-R7 application, or ADM6318CY29ARJZ-R7 equivalent, key selection criteria include its dual-reset-output architecture, guaranteed reset validity down to VCC = 1 V, glitch-immune supervision, and compatibility with low-power microcontroller reset sequencing requiring both active-low and active-high assertion signals.

Technical Context

The ADM6318CY29ARJZ-R7 implements a precision voltage comparator with 40 ppm/°C temperature coefficient and 3 mV hysteresis to monitor VCC against a factory-trimmed 2.93 V threshold. Its watchdog timer clears on any WDI logic transition (min. 50 ns pulse width) and times out after 1.6 s (typical), triggering reset if microprocessor code stalls.

It integrates dual push-pull reset stages: one active-low (RESET) and one active-high (RESET), both guaranteed functional down to VCC = 1 V. The device lacks manual reset input but includes internal 52 kΩ pull-up on WDI and supports watchdog disable via floating WDI.

Key Specifications

Pinout & Package

ADM6318CY29ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package, 2.9 mm × 1.6 mm × 1.1 mm, RoHS-compliant and tape-and-reel packaged (3000 units/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6318CY29ARJZ-R7, the RL7 variant offers identical performance in smaller reels, while MAX6326UR29+T reduces integration at the cost of losing watchdog supervision and dual-reset functionality-making it suitable only for simpler, non-watchdog-dependent applications.

Availability

ADM6318CY29ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive telematics units, and smart energy meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for ADM6318CY29ARJZ-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, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM6318 belongs to Analog Devices' supervisory circuits product line, engineered specifically for robust microprocessor reset management in harsh environments where voltage monitoring, watchdog supervision, and dual-polarity reset signaling are critical.

FAQ

What is the reset threshold voltage of the ADM6318CY29ARJZ-R7?

The ADM6318CY29ARJZ-R7 has a factory-trimmed reset threshold of 2.93 V, with tolerance of ±2.5% over the full industrial temperature range (−40°C to +85°C). This value is confirmed in Table 9 of the Rev. K datasheet and aligns with Reset Threshold Number 29 in Table 5. The device guarantees valid reset assertion down to VCC = 1 V, making it suitable for brownout detection in 3.3 V systems with wide supply variation.

Does the ADM6318CY29ARJZ-R7 include a manual reset input?

No, the ADM6318CY29ARJZ-R7 does not feature a manual reset (MR) input. As shown in Table 1 of the datasheet, the ADM6318 variant includes watchdog input (WDI) and dual push-pull reset outputs but omits MR functionality-unlike the ADM6316 or ADM6319. System-level manual reset must be implemented externally, for example, via a processor GPIO or dedicated reset button circuit feeding into the WDI pin or host MCU.

What are the watchdog timeout options available for the ADM6318CY29ARJZ-R7?

The ADM6318CY29ARJZ-R7 is configured with a typical watchdog timeout of 1.6 seconds, corresponding to suffix "Y" per Table 7. This is verified in Table 9, which lists "Typical Watchdog Timeout (sec)" as 1.6 for this model. The timeout is not user-adjustable; it is fixed at manufacture and applies across the full temperature range with min/typ/max values of 1.12 s / 1.6 s / 2.24 s.

How does the dual reset output architecture of the ADM6318CY29ARJZ-R7 benefit system design?

The ADM6318CY29ARJZ-R7 provides two independent push-pull outputs: active-low RESET (Pin 1) and active-high RESET (Pin 3). This eliminates the need for external inverters or level shifters when interfacing with mixed-logic systems-for example, asserting reset to both a 3.3 V MCU (requiring active-low) and a 5 V peripheral (requiring active-high). Both outputs remain valid down to VCC = 1 V, ensuring coordinated, glitch-free initialization across voltage domains.

What package type and marking code does the ADM6318CY29ARJZ-R7 use?

The ADM6318CY29ARJZ-R7 uses a 5-lead SOT-23 package (package option RJ-5), with dimensions per Figure 22 in the datasheet. Its top-side marking code is "M4Q", as specified in the Ordering Guide (Table 8). The "R7" suffix denotes tape-and-reel packaging with 3000 units per reel, and "Z" indicates RoHS compliance.