Analog Devices Inc. ADM1818-R22AKSZ-R7

Overview

ADM1818-R22AKSZ-R7 from Analog Devices is a precision microprocessor reset circuit with open-drain output and internal pull-up resistor, designed to monitor 2.5 V supply rails. It features a 2.18 V typical reset threshold, 150 ms reset timeout, −40°C to +105°C operating range, and SC70-3 package. It ensures safe system initialization in embedded controllers requiring reliable power-on reset for low-voltage logic.

For engineers reviewing the ADM1818-R22AKSZ-R7 datasheet, ADM1818-R22AKSZ-R7 pinout, ADM1818-R22AKSZ-R7 application, or ADM1818-R22AKSZ-R7 equivalent, key selection criteria include trip point accuracy (±1.5% over temperature), push-button reset compatibility, ultra-low quiescent current (≤10 µA at 3.6 V), and open-drain interface suitability for shared reset buses in industrial microcontroller systems.

Technical Context

The ADM1818-R22AKSZ-R7 implements a bandgap-based voltage reference with comparator and 150 ms monostable delay to generate a clean, glitch-free reset pulse after power-up or brownout recovery. Its internal 5.5 kΩ pull-up resistor eliminates external components while maintaining compatibility with standard CMOS reset inputs.

Unlike push-pull variants, this device uses open-drain output architecture with active-low assertion, enabling wired-OR reset bus configurations and manual reset via external push-button connected between RST and GND - with 1 µs minimum button press detection and guaranteed 150 ms reset hold time post-release.

Key Specifications

Pinout & Package

ADM1818-R22AKSZ-R7 is housed in a RoHS-compliant 3-lead SC70 (KS-3) package, measuring 2.00 mm × 1.25 mm × 0.95 mm, with gull-wing leads and JEDEC-standard footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326-L23T+ and TPS3808G12DBVR, ADM1818-R22AKSZ-R7 delivers exact 2.18 V trip point with integrated push-button support and smallest footprint - making it optimal for high-reliability, space-constrained 2.5 V system reset where timing precision and manual recovery are mandatory.

Availability

ADM1818-R22AKSZ-R7 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 with full temperature range qualification and RoHS compliance.

Supply support for ADM1818-R22AKSZ-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 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 ADM181x series was engineered specifically for cost-sensitive, space-constrained microprocessor reset applications requiring guaranteed timing, low power, and robust voltage monitoring across extended temperature ranges - with emphasis on automotive and industrial reliability standards.

FAQ

What is the exact reset threshold voltage of the ADM1818-R22AKSZ-R7?

The ADM1818-R22AKSZ-R7 has a typical reset threshold of 2.18 V, with a guaranteed range of 2.12 V to 2.25 V over the full −40°C to +105°C operating temperature range. This value is factory-trimmed and specified in Table 1 of the Rev. F datasheet under the "ADM1815-R22/ADM1816-R22/ADM1817-R22/ADM1818-R22" row. The threshold is optimized for reliable supervision of 2.5 V supply rails with adequate dropout margin.

Does the ADM1818-R22AKSZ-R7 support manual reset via push-button?

Yes, the ADM1818-R22AKSZ-R7 supports manual reset through an external push-button connected between the RST pin and GND. As documented in the "ADM1813 AND ADM1818" section (Page 7), pressing the button for ≥1 µs pulls RST low, and upon release, the device holds RST low for 150 ms typical. This feature is intrinsic to the ADM1818 variant and requires no additional circuitry.

What package type and dimensions does the ADM1818-R22AKSZ-R7 use?

The ADM1818-R22AKSZ-R7 uses the SC70-3 (KS-3) package: 2.00 mm × 1.25 mm × 0.95 mm body size with gull-wing leads. Per Figure 16 (Page 8), lead pitch is 0.65 mm, and coplanarity is ≤0.10 mm. The "Z" suffix confirms RoHS compliance, and "R7" denotes 7-inch reel packaging - verified in the Ordering Guide (Page 9).

Can the ADM1818-R22AKSZ-R7 be used to monitor a 3.3 V supply?

No - the ADM1818-R22AKSZ-R7 is configured for 2.18 V threshold and is intended for 2.5 V supply monitoring. For 3.3 V rails, Analog Devices specifies the ADM1818-10 variant (2.88 V typical) or ADM1818-5 (3.06 V typical). Using ADM1818-R22AKSZ-R7 on 3.3 V would cause immediate, continuous reset assertion, rendering the system non-operational.

What is the maximum sink current capability of the ADM1818-R22AKSZ-R7 RST pin?

The RST pin of the ADM1818-R22AKSZ-R7 can sink up to 8 mA when asserted (low), tested at VCC ≥ 2.7 V and VOUT = 0.4 V - per Table 1 "OUTPUT CURRENT" section (Page 3). This allows direct interfacing with standard CMOS reset inputs and supports wired-OR configurations with up to three identical ADM1818 devices without external buffering.