Analog Devices Inc. ADM1816-R22AKSZ-R7

Overview

ADM1816-R22AKSZ-R7 from Analog Devices is a precision low-voltage microprocessor reset circuit with 2.18 V (typical) trip point, open-drain output with internal 5.5 kΩ pull-up resistor, 150 ms reset timeout, and SC70-3 package. It monitors 2.5 V supply rails in embedded controllers and ensures safe power-on initialization by holding reset active until VCC stabilizes above threshold.

For engineers reviewing the ADM1816-R22AKSZ-R7 datasheet, ADM1816-R22AKSZ-R7 pinout, ADM1816-R22AKSZ-R7 application, or ADM1816-R22AKSZ-R7 equivalent, key selection criteria include reset threshold accuracy (±1.5% over −40°C to +105°C), ultra-low quiescent current (4 µA at 3.6 V), open-drain compatibility with I²C-bus logic levels, and SC70 footprint for space-constrained industrial control PCBs.

Technical Context

The ADM1816-R22AKSZ-R7 implements a bandgap-based voltage reference with temperature-compensated comparator and fixed 150 ms power-up delay timer. Its internal pull-up resistor eliminates external components required for open-drain reset assertion in 3.3 V/2.5 V systems.

Unlike push-pull variants (e.g., ADM1815-R22), this device uses an open-drain RST output that sinks up to 8 mA while asserting reset, enabling wired-OR configuration and direct interface with microcontroller reset inputs requiring active-low, level-sensitive signaling.

Key Specifications

Pinout & Package

ADM1816-R22AKSZ-R7 is housed in a 3-lead SC70 (KS-3) package with gull-wing leads. The package measures 2.00 mm × 2.10 mm × 0.95 mm and complies with EIAJ SC70 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLV803EB21DPWR and MAX6326XR21D3+, the ADM1816-R22AKSZ-R7 delivers tighter threshold accuracy (±1.5% vs. ±2%–±3%), shorter and more consistent reset timeout (150 ms ±33% vs. 350 ms or 140 ms), and integrated pull-up optimized for 3.3 V logic - making it optimal for industrial control where deterministic timing and noise immunity are critical.

Availability

ADM1816-R22AKSZ-R7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control units, medical wearable sensor hubs, and smart energy meter MCU subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for ADM1816-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM181x series was designed specifically for reliable, low-cost power-supply monitoring in microprocessor-based systems - emphasizing precision threshold accuracy, minimal external components, and robust operation across extended industrial temperature ranges.

FAQ

What is the exact reset threshold voltage of the ADM1816-R22AKSZ-R7?

The ADM1816-R22AKSZ-R7 has a nominal reset threshold of 2.18 V, with guaranteed minimum of 2.12 V and maximum of 2.25 V over −40°C to +105°C. This 2.18 V trip point is optimized for monitoring 2.5 V supplies with sufficient margin to detect brownout conditions before system failure occurs. The ADM1816-R22AKSZ-R7 achieves ±1.5% accuracy across temperature, exceeding standard industrial requirements.

Does the ADM1816-R22AKSZ-R7 require an external pull-up resistor?

No, the ADM1816-R22AKSZ-R7 integrates a 5.5 kΩ internal pull-up resistor on its open-drain RST output, eliminating the need for external components in standard 3.3 V logic interfacing. This simplifies BOM and PCB layout while maintaining compatibility with microcontrollers requiring active-low reset signals. The ADM1816-R22AKSZ-R7's internal pull-up ensures predictable rise time and eliminates variability introduced by discrete resistor tolerances.

What is the reset timeout duration of the ADM1816-R22AKSZ-R7 and how is it implemented?

The ADM1816-R22AKSZ-R7 provides a fixed 150 ms reset timeout (100–250 ms range) after VCC rises above the 2.18 V threshold. This delay is generated by an internal RC timer - no external capacitor is needed. The ADM1816-R22AKSZ-R7 uses this timeout to ensure power supply stabilization before releasing the reset signal to the microcontroller, preventing premature boot and firmware corruption during power-up transients.

Can the ADM1816-R22AKSZ-R7 be used in automotive applications?

Yes, the ADM1816-R22AKSZ-R7 is rated for −40°C to +105°C operation and meets key automotive reliability requirements for body electronics. Its 2.18 V threshold enables precise monitoring of 2.5 V domains powering door modules and lighting drivers. While not AEC-Q200 qualified out-of-box, the ADM1816-R22AKSZ-R7's performance and thermal specs align with Tier-2 automotive subsystems where extended temperature operation and brownout immunity are essential.

How does the ADM1816-R22AKSZ-R7 differ from the ADM1815-R22 series?

The ADM1816-R22AKSZ-R7 differs from the ADM1815-R22 series primarily in output topology: ADM1816-R22AKSZ-R7 uses open-drain with internal pull-up, while ADM1815-R22 variants feature push-pull outputs. This makes the ADM1816-R22AKSZ-R7 suitable for wired-OR reset buses and I²C-compatible logic levels, whereas ADM1815-R22 requires no external pull-up but cannot share reset lines. Both share identical 2.18 V threshold and 150 ms timeout.