Analog Devices Inc. ADM1817-R23AKSZ-R7

Overview

ADM1817-R23AKSZ-R7 from Analog Devices is an active-high push-pull microprocessor reset circuit designed to monitor 2.5 V, 3 V, and 3.3 V supply rails. It features a precise 2.31 V (typical) reset threshold, 150 ms reset timeout, and operates across −40°C to +105°C. Used in embedded controllers and industrial microprocessor systems requiring reliable power-on initialization.

For engineers reviewing the ADM1817-R23AKSZ-R7 datasheet, ADM1817-R23AKSZ-R7 pinout, ADM1817-R23AKSZ-R7 application, or ADM1817-R23AKSZ-R7 equivalent, key selection criteria include trip point accuracy, active-high output compatibility with MCU reset inputs, SC70 package footprint, and guaranteed reset timing under temperature variation.

Technical Context

The ADM1817-R23AKSZ-R7 integrates a precision voltage reference, comparator, and 150 ms delay timer in a single die. Its active-high push-pull output drives directly into most microcontroller reset pins without external pull-up components. The device asserts reset when VCC falls below 2.31 V (typ), holds reset for ≥150 ms after VCC rises above threshold, and guarantees operation down to 1.2 V supply.

It belongs to the ADM181x family optimized for low quiescent current (≤16 µA at 5.5 V) and high noise immunity, with reset detection insensitive to fast transients ≤10 µs. The internal architecture avoids external RC timing networks, eliminating component drift and board space overhead.

Key Specifications

Pinout & Package

ADM1817-R23AKSZ-R7 is housed in a RoHS-compliant 3-lead SC70 (KS-3) package, measuring 2.20 mm × 1.35 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 supervisor applications.

Compared with ADM1817-R23AKSZ-R7, MAX809TRD2T requires board-level adaptation for output polarity and adds component count, while TPS3808G12QDBVRQ1 offers automotive qualification at the cost of higher current draw and larger footprint-making ADM1817-R23AKSZ-R7 optimal for compact, industrial-grade 2.5 V rail supervision.

Availability

ADM1817-R23AKSZ-R7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply with guaranteed long-term availability.

Supply support for ADM1817-R23AKSZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM181x product line was engineered specifically for cost-sensitive, space-constrained microprocessor reset applications in industrial, computing, and automotive systems-emphasizing precision threshold accuracy, monolithic timing, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the ADM1817-R23AKSZ-R7?

The ADM1817-R23AKSZ-R7 has a factory-trimmed reset threshold of 2.31 V typical, with a guaranteed range of 2.25 V (min) to 2.37 V (max) over −40°C to +105°C. This value is specified in Table 1 of the Rev. F datasheet and applies exclusively to the R23 variant, distinguishing it from other members of the ADM181x family such as the R22 (2.18 V) or -20 (2.55 V) versions.

Does the ADM1817-R23AKSZ-R7 require an external pull-up resistor on its RST pin?

No, the ADM1817-R23AKSZ-R7 does not require an external pull-up resistor because it features an active-high push-pull output stage. Unlike open-drain variants (e.g., ADM1816-R23AKSZ-R7), this device internally drives both high and low states on the RST pin, enabling direct connection to microcontrollers with active-high reset inputs such as STM32F4xx or NXP Kinetis series without additional components.

What package type and dimensions does the ADM1817-R23AKSZ-R7 use?

The ADM1817-R23AKSZ-R7 uses a 3-lead SC70 (KS-3) package, compliant with EIAJ SC70 standards. Its dimensions are 2.20 mm × 1.35 mm × 0.95 mm (L × W × H), with 0.65 mm lead pitch. The "Z" suffix confirms RoHS compliance, and "R7" denotes 7-inch tape-and-reel packaging per ordering guide notation.

Can the ADM1817-R23AKSZ-R7 monitor a 3.3 V supply rail?

Yes, the ADM1817-R23AKSZ-R7 is explicitly rated for monitoring 3.3 V supplies. With a 2.31 V reset threshold, it provides adequate hysteresis margin above common 3.3 V LDO dropout voltages (typically ~2.0 V), ensuring reliable detection of brownout conditions before the downstream 3.3 V rail collapses to unsafe levels for connected logic.

How does the reset timeout behavior work on the ADM1817-R23AKSZ-R7 during power-up?

During power-up, the ADM1817-R23AKSZ-R7 asserts reset (RST = low) while VCC remains below 2.31 V. Once VCC crosses the threshold, RST remains low for a guaranteed minimum of 100 ms and typical 150 ms before transitioning high. This timeout is internally generated and independent of external components, ensuring consistent release timing across temperature and supply variations as verified in Figure 6 of the datasheet.