Analog Devices Inc. ADM1818-R22AKS-RL

Overview

ADM1818-R22AKS-RL 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. Used in embedded controllers to ensure safe power-on initialization.

For engineers reviewing the ADM1818-R22AKS-RL datasheet, ADM1818-R22AKS-RL pinout, ADM1818-R22AKS-RL application, or ADM1818-R22AKS-RL equivalent, key selection criteria include trip point accuracy, reset timeout stability over temperature, push-button reset compatibility, and open-drain interface requirements for mixed-voltage systems.

Technical Context

The ADM1818-R22AKS-RL implements a bandgap-based voltage reference with comparator and 150 ms monostable delay to generate a reliable reset pulse after power-up or brownout recovery. Its internal pull-up resistor (3.1–7.5 kΩ) eliminates external components when interfacing with 3.3 V or 5 V logic inputs.

As part of the ADM181x family, it supports manual reset via push-button connected between RST and GND, with 1 µs minimum button press detection and guaranteed 150 ms reset assertion post-release - critical for field-serviceable industrial controllers.

Key Specifications

Pinout & Package

ADM1818-R22AKS-RL is housed in a 3-lead SC70 (KS-3) package, measuring 2.00 mm × 1.25 mm × 0.95 mm, with gull-wing leads and JEDEC-compliant footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326-L23T+T and TPS3808G12DBVR, ADM1818-R22AKS-RL delivers tighter trip point accuracy at 2.18 V, integrates push-button functionality without external parts, and achieves lowest quiescent current - making it optimal for compact, low-power 2.5 V systems where board space and battery life are critical.

Availability

ADM1818-R22AKS-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-R22AKS-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM181x series was developed specifically for cost-sensitive, space-constrained microprocessor reset applications in industrial, automotive, and portable electronics - emphasizing integration, temperature stability, and ease of use.

FAQ

What is the exact reset threshold voltage of ADM1818-R22AKS-RL?

The ADM1818-R22AKS-RL has a nominal reset threshold of 2.18 V, with guaranteed minimum and maximum values of 2.12 V and 2.25 V respectively, measured across −40°C to +105°C. This threshold is factory-trimmed and specified in Table 1 of the Rev. F datasheet under "ADM1815-R22, ADM1816-R22, ADM1817-R22, ADM1818-R22" row.

Does ADM1818-R22AKS-RL support manual reset via push-button?

Yes, ADM1818-R22AKS-RL supports manual reset: pressing a push-button between RST and GND for ≥1 µs triggers a full 150 ms reset pulse after release. This behavior is explicitly documented in the "ADM1813 AND ADM1818" section (Page 7) and Figure 12 of the Rev. F datasheet.

What package type and dimensions does ADM1818-R22AKS-RL use?

ADM1818-R22AKS-RL uses the SC70-3 (KS-3) package: 2.00 mm × 1.25 mm × 0.95 mm body size, 0.65 mm lead pitch, gull-wing leads. Dimensions are fully specified in Figure 16 (Page 8) of the Rev. F datasheet and comply with EIAJ SC70 standards.

What is the internal pull-up resistor value for ADM1818-R22AKS-RL?

The internal pull-up resistor for ADM1818-R22AKS-RL is specified as 3.1 kΩ (min), 5.5 kΩ (typ), and 7.5 kΩ (max) - consistent with all ADM1813/ADM1818 variants per Table 1 (Page 3) of the Rev. F datasheet. This eliminates need for external pull-up in most 3.3 V or 5 V interface scenarios.

Can ADM1818-R22AKS-RL operate from a 1.8 V supply?

No, ADM1818-R22AKS-RL requires minimum 1.2 V supply but is designed to monitor 2.5 V rails - its 2.18 V threshold implies operation only when VCC ≥ ~2.3 V for reliable reset deassertion. Supply voltage below 2.3 V may cause indeterminate RST behavior; see Absolute Maximum Ratings (Table 2, Page 4) and functional description (Page 1).