Analog Devices Inc. ADM1818-R22AKSZ-RL

Overview

ADM1818-R22AKSZ-RL from Analog Devices is a precision 3-lead SC70-packaged microprocessor reset circuit with 2.18 V (typical) voltage trip point, open-drain output with internal 5.5 kΩ pull-up resistor, 150 ms reset timeout, and push-button reset capability. It monitors 2.5 V supply rails in industrial embedded systems requiring reliable power-on initialization and manual system recovery.

For engineers reviewing the ADM1818-R22AKSZ-RL datasheet, ADM1818-R22AKSZ-RL pinout, ADM1818-R22AKSZ-RL application, or ADM1818-R22AKSZ-RL equivalent, key selection criteria include trip threshold accuracy (±1.5% over −40°C to +105°C), low quiescent current (≤10 µA at 3.6 V), SC70 footprint compatibility, and integrated push-button debouncing for field-serviceable reset functionality.

Technical Context

The ADM1818-R22AKSZ-RL implements a precision bandgap reference and comparator-based voltage monitoring architecture with built-in 150 ms power-up delay timer. Its internal pull-up resistor eliminates external components when interfacing with standard CMOS reset inputs.

It supports both automatic reset assertion during undervoltage conditions and manual reset via external push-button connected between RST and GND, with 1 µs minimum button press detection and guaranteed 150 ms post-release reset hold time - critical for robust firmware recovery in automotive and industrial controllers.

Key Specifications

Pinout & Package

ADM1818-R22AKSZ-RL is housed in a 3-lead SC70 (KS-3) package, measuring 2.00 mm × 2.10 mm × 0.95 mm, with JEDEC-compliant footprint and coplanarity ≤0.10 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM1816-R22AKSZ-RL and MAX6326XR23+T, the ADM1818-R22AKSZ-RL uniquely combines precise 2.18 V supervision, integrated pull-up, and push-button support in SC70 - making it the only option for compact, serviceable 2.5 V system resets without external components.

Availability

ADM1818-R22AKSZ-RL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical handheld diagnostics, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM1818-R22AKSZ-RL 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 family was designed specifically for cost-sensitive, space-constrained microprocessor reset applications requiring guaranteed power-on timing, precise voltage thresholds, and field-serviceable manual reset - targeting industrial automation and automotive subsystems.

FAQ

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

The ADM1818-R22AKSZ-RL has a nominal reset threshold of 2.18 V (typical), with guaranteed min/max values of 2.12 V and 2.25 V over the full −40°C to +105°C operating range. This value is laser-trimmed during manufacturing and specified in Table 1 of the Rev. F datasheet under the "ADM1815-R22/ADM1816-R22/ADM1817-R22/ADM1818-R22" row.

Does the ADM1818-R22AKSZ-RL require an external pull-up resistor?

No, the ADM1818-R22AKSZ-RL includes an internal 5.5 kΩ pull-up resistor on the RST pin, eliminating the need for external components. This is explicitly stated in the "INTERNAL PULL-UP RESISTOR" section of the datasheet (Table 1), which specifies 3.1 kΩ (min) to 7.5 kΩ (max) for ADM1813/ADM1818 variants.

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

No - the ADM1818-R22AKSZ-RL is optimized for 2.5 V supply monitoring with its 2.18 V threshold. For 3.3 V rails, Analog Devices specifies the ADM1818-10 (2.88 V trip) or ADM1818-5 (3.06 V trip). Using ADM1818-R22AKSZ-RL on 3.3 V would assert reset continuously, as VCC remains well above threshold.

What is the function of the push-button reset feature in the ADM1818-R22AKSZ-RL?

The ADM1818-R22AKSZ-RL supports manual reset via a push-button connected between RST and GND. Pressing the button pulls RST low for ≥1 µs; upon release, the device holds RST low for an additional 150 ms (typical) to ensure reliable MCU reset - a hardware-debounced recovery path independent of firmware.

Is the ADM1818-R22AKSZ-RL RoHS compliant and lead-free?

Yes - the "Z" suffix in ADM1818-R22AKSZ-RL denotes RoHS compliance and lead-free packaging per Analog Devices' ordering guide (Page 12, footnote 2: "Z = RoHS Compliant Part"). The SC70 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 1.