Analog Devices Inc. ADM6318CY46ARJ-RL7

Overview

ADM6318CY46ARJ-RL7 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 4.63 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, and operates from 1 V to 5.5 V supply. Used in embedded controllers where reliable brownout detection and code execution integrity are critical.

For engineers reviewing the ADM6318CY46ARJ-RL7 datasheet, ADM6318CY46ARJ-RL7 pinout, ADM6318CY46ARJ-RL7 application, or ADM6318CY46ARJ-RL7 equivalent, key selection criteria include reset threshold accuracy at temperature extremes, guaranteed reset validity down to VCC = 1 V, watchdog pulse width tolerance (50 ns min), and compatibility with 5-lead SOT-23 PCB footprints requiring dual-reset signaling.

Technical Context

The ADM6318CY46ARJ-RL7 implements a precision voltage reference-based reset generator with hysteresis (3 mV) and temperature coefficient of 40 ppm/°C, ensuring stable threshold behavior across industrial temperature range. Its watchdog detector clears on any WDI logic transition (low-to-high or high-to-low), with minimum pulse width of 50 ns and input thresholds at 0.3×VCC / 0.7×VCC.

This device lacks manual reset input (MR) but provides two independent push-pull reset outputs: one active-low (RESET) and one active-high (RESET). Both outputs remain valid down to VCC = 1 V, with sink/source drive capability specified at multiple VCC levels - e.g., 1.2 mA sink at VCC ≥ 2.7 V and 500 µA source at VCC ≥ 2.7 V.

Key Specifications

Pinout & Package

ADM6318CY46ARJ-RL7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.8–3.0 mm body length. Pin 1 is RESET (active-low), Pin 2 is GND, Pin 3 is RESET (active-high), Pin 4 is WDI, and Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6318CY46ARJ-RL7, ADM6318CY46ARJZ-R7 offers identical supervision functionality with RoHS-compliant marking and standard reel packaging, while MAX6326LT46D2T+ trades watchdog capability and dual outputs for lower supply current - making it suitable only for simpler, non-watchdog-dependent designs.

Availability

ADM6318CY46ARJ-RL7 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 with guaranteed long-term availability.

Supply support for ADM6318CY46ARJ-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, with engineering expertise spanning precision sensing, power management, and reliability-critical ICs.

The ADM63xx family was designed specifically for microprocessor-based systems needing robust power-on reset, brownout protection, and watchdog-based code execution monitoring - targeting industrial, medical, and automotive applications demanding guaranteed reset behavior across temperature and voltage extremes.

FAQ

What is the exact reset threshold voltage of ADM6318CY46ARJ-RL7 and how does it vary with temperature?

The ADM6318CY46ARJ-RL7 has a nominal reset threshold of 4.63 V, with tolerance of ±2.5% over the full industrial temperature range (−40°C to +85°C). At 25°C, the threshold is 4.63 V ±1.5%, and its temperature coefficient is 40 ppm/°C - meaning drift is limited to approximately ±11.6 mV across the full range. This specification is confirmed in Table 5 of the Rev. I datasheet.

Does ADM6318CY46ARJ-RL7 include a manual reset input (MR)?

No, ADM6318CY46ARJ-RL7 does not include a manual reset input. Per Table 1 and Pin Function Descriptions (Page 6), the ADM6318 variant is defined as "Yes" for watchdog, "No" for manual reset, and "Push-pull / Push-pull" for output stage. Pins are RESET, GND, RESET, WDI, and VCC - with no MR pin allocated. This distinguishes it from ADM6316/ADM6317/ADM6319 variants.

What are the watchdog timeout options available for ADM6318CY46ARJ-RL7 and how is it selected?

The ADM6318CY46ARJ-RL7 uses the "Y" suffix in its ordering code, corresponding to a typical watchdog timeout of 1.6 s (min 1.12 s, max 2.24 s). This is fixed by factory programming and cannot be changed in-circuit. The watchdog is enabled by driving WDI with periodic logic transitions; leaving WDI floating disables it. Selection is encoded in the part number per Figure 22 and Table 7.

Can both reset outputs of ADM6318CY46ARJ-RL7 drive loads independently, and what are their drive strengths?

Yes, both RESET (Pin 1, active-low) and RESET (Pin 3, active-high) are independent push-pull outputs. At VCC ≥ 2.7 V, each can sink 1.2 mA or source 500 µA while maintaining valid logic levels. Output voltage specs are confirmed in Table 2: low-level output ≤0.3 V at 1.2 mA sink, high-level output ≥0.8×VCC at 500 µA source. They may drive separate logic domains without contention.

Is ADM6318CY46ARJ-RL7 RoHS compliant and what is its packaging format?

Yes, ADM6318CY46ARJ-RL7 is RoHS compliant, as indicated by the "Z" in the ordering code per Figure 22 and Ordering Guide. It is supplied in a 3,000-piece tape-and-reel format (RL7 designation), housed in a 5-lead SOT-23 package (JEDEC MO-178-AA, package code RJ-5), with marking code "N02" laser-etched on the top surface.