Analog Devices Inc. ADM1818-20AKS-RL7

Overview

ADM1818-20AKS-RL7 from Analog Devices is a microprocessor reset circuit with open-drain output and internal pull-up resistor, designed to monitor 3 V supply rails. It features a 2.55 V (typical) reset threshold, 150 ms reset timeout, −40°C to +105°C operating temperature range, and SC70-3 package. It enables safe system initialization in embedded controllers requiring reliable power-on reset.

For engineers reviewing the ADM1818-20AKS-RL7 datasheet, ADM1818-20AKS-RL7 pinout, ADM1818-20AKS-RL7 application, or ADM1818-20AKS-RL7 equivalent, key selection criteria include trip point accuracy (±1.5% typical), push-button reset support, low quiescent current (≤10 µA at 3.6 V), and compatibility with 3 V microcontroller reset inputs without external components.

Technical Context

The ADM1818-20AKS-RL7 implements a precision voltage comparator with built-in hysteresis and a fixed 150 ms power-up delay timer. Its internal reference ensures stable trip point performance across temperature (±0.02%/°C typical drift).

It operates as an active-low reset supervisor: RST remains low while VCC is below 2.55 V (typ), holds low for 150 ms after VCC rises above threshold, and supports manual reset via push-button connected between RST and GND with 1 µs detection and 150 ms assertion.

Key Specifications

Pinout & Package

ADM1818-20AKS-RL7 uses the SC70-3 (KS-3) package: 1.1 mm × 1.3 mm × 0.9 mm, 3-lead surface-mount, JEDEC-compliant thin shrink outline.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with MAX6326–26D2T and TPS3808G12DBVR, the ADM1818-20AKS-RL7 offers exact 2.55 V trip matching 3 V supply tolerance, integrated 150 ms timing, and push-button functionality in a minimal 3-pin SC70 footprint-making it optimal for cost-sensitive, space-constrained 3 V microcontroller reset applications where field serviceability matters.

Availability

ADM1818-20AKS-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM1818-20AKS-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The ADM181x series was engineered specifically for robust, low-cost microprocessor reset supervision in space- and power-constrained embedded systems, emphasizing precision trip points, guaranteed timing, and simplified integration.

FAQ

What is the exact reset threshold voltage of the ADM1818-20AKS-RL7?

The ADM1818-20AKS-RL7 has a nominal reset threshold of 2.55 V (typical), with a guaranteed range of 2.47 V (min) to 2.64 V (max) over −40°C to +105°C. This value is factory-trimmed and specified in Table 1 of the Rev. F datasheet for the -20 variant, making it suitable for monitoring 3 V supplies with appropriate margin.

Does the ADM1818-20AKS-RL7 support manual reset via push-button?

Yes, the ADM1818-20AKS-RL7 supports manual reset: connecting a push-button between RST and GND pulls the output low. The device detects presses ≥1 µs and asserts reset for 150 ms after button release. This feature is explicitly confirmed in the "ADM1813 AND ADM1818" section (Page 7) and Figure 12 of the datasheet.

What package type and dimensions does the ADM1818-20AKS-RL7 use?

The ADM1818-20AKS-RL7 uses the SC70-3 (KS-3) package: 1.10 mm × 1.30 mm × 0.90 mm body size, 0.65 mm lead pitch, and JEDEC-compliant thin shrink outline. Dimensions are documented in Figure 16 (Page 8) and ordering guide footnote 2 confirms "KS-3 (SC70)" for this part number.

What is the maximum supply voltage the ADM1818-20AKS-RL7 can withstand?

The ADM1818-20AKS-RL7 has an absolute maximum VCC rating of +6.0 V (Table 2, Page 4), but its functional operating range is 1.2 V to 5.5 V (Table 1, Page 3). Operation above 5.5 V risks permanent damage, and design must ensure VCC stays within 1.2 V–5.5 V for reliable reset behavior.

How does the internal pull-up resistor value affect system design?

With a typical 5.5 kΩ internal pull-up (Table 1, Page 3), the ADM1818-20AKS-RL7 drives RST high to ~VCC − 0.1 V at 0–500 µA sink, eliminating the need for an external pull-up. This reduces component count, saves PCB area, and ensures consistent rise time without layout-dependent RC variations-critical in noise-sensitive industrial environments.