Analog Devices Inc. ADM1815-R22AKS-RL7

Overview

ADM1815-R22AKS-RL7 from Analog Devices is an active-low, open-drain microprocessor reset circuit with internal pull-up resistor, designed to monitor 2.18 V (typical) supply rails in space-constrained embedded systems. It delivers a 150 ms reset timeout after power-up, sinks up to 8 mA, draws only 4–10 µA quiescent current, and operates across −40°C to +105°C - enabling reliable system initialization in industrial controllers and automotive ECUs.

For engineers reviewing the ADM1815-R22AKS-RL7 datasheet, ADM1815-R22AKS-RL7 pinout, ADM1815-R22AKS-RL7 application, or ADM1815-R22AKS-RL7 equivalent, key selection criteria include its 2.18 V trip point tolerance (±0.06 V), SC70-3 package footprint, push-button reset compatibility, and guaranteed reset assertion during brownout conditions below V_TH.

Technical Context

The ADM1815-R22AKS-RL7 implements a precision bandgap reference with temperature-compensated comparator and 150 ms monostable delay circuit. Its reset output remains low while V_CC is below 2.18 V (typ), then holds low for 150 ms (typ) after V_CC rises above threshold - ensuring stable power supply settling before processor release.

This variant belongs to the ADM1815/ADM1816/ADM1817/ADM1818 family with open-drain outputs and internal pull-up resistors (5.5 kΩ typical). Unlike push-pull variants, it requires no external pull-up and supports manual reset via RST-to-GND switch with sub-microsecond detection and 150 ms hold time.

Key Specifications

Pinout & Package

ADM1815-R22AKS-RL7 is housed in a 3-lead SC70 (KS-3) package - 2.00 mm × 1.25 mm × 0.95 mm, JEDEC-compliant, surface-mountable with gull-wing leads. Pin 1 = V_CC, Pin 2 = GND, Pin 3 = RST (open-drain active-low output).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM1815-R22ARTZ-RL7, the SC70 package offers 30% smaller area and superior thermal performance; versus TPS3808G18DBVR, ADM1815-R22AKS-RL7 provides exact 2.18 V trip matching and integrated pull-up - eliminating layout dependencies and validation overhead for 2.5 V rail supervision.

Availability

ADM1815-R22AKS-RL7 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, medical instrumentation, and smart metering applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for ADM1815-R22AKS-RL7 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 engineered specifically for cost-sensitive, space-constrained microprocessor reset supervision - delivering factory-trimmed thresholds, integrated timing, and robust operation across extended temperature ranges without external components.

FAQ

What is the exact reset threshold voltage of the ADM1815-R22AKS-RL7?

The ADM1815-R22AKS-RL7 has a nominal reset threshold of 2.18 V (typical), with a guaranteed range of 2.12 V (min) to 2.25 V (max) across −40°C to +105°C. This value is factory-trimmed and specified in Table 1 of the Rev. F datasheet under "VCC TRIP POINT" for the "ADM1815-R22" variant. It is intended for monitoring 2.5 V supply rails with adequate noise margin.

Does the ADM1815-R22AKS-RL7 require an external pull-up resistor on the RST pin?

No, the ADM1815-R22AKS-RL7 does not require an external pull-up resistor. It features an integrated 5.5 kΩ (typical) internal pull-up resistor on the RST pin, as confirmed in Table 1 ("INTERNAL PULL-UP RESISTOR") and the "ADM1815/ADM1816" functional description. This eliminates the need for external components and simplifies PCB layout for the ADM1815-R22AKS-RL7.

Can the ADM1815-R22AKS-RL7 be used with a manual push-button reset?

Yes, the ADM1815-R22AKS-RL7 supports manual reset via a push-button switch connected between RST and GND. As documented in the "ADM1813 AND ADM1818" section and Figure 12, pressing the button pulls RST low; upon release, the device holds RST low for 150 ms (typical), providing a clean, debounced reset pulse without external RC networks - a confirmed capability of the ADM1815-R22AKS-RL7.

What package type and dimensions does the ADM1815-R22AKS-RL7 use?

The ADM1815-R22AKS-RL7 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 and the Ordering Guide. It is RoHS-compliant (indicated by "Z" suffix), JEDEC-compliant, and optimized for high-density automated assembly - distinct from the larger SOT-23-3 option used by other variants of the ADM1815-R22 series.

What is the supply current consumption of the ADM1815-R22AKS-RL7 at 3.6 V?

At V_CC = 3.6 V and TA = −40°C to +105°C, the ADM1815-R22AKS-RL7 draws 4 µA (minimum), 10 µA (typical), and ≤16 µA (maximum) quiescent current, as specified in Table 1 under "Current" for the 3.6 V condition. This ultra-low I_Q enables use in battery-backed or energy-harvesting systems where standby power is critical for the ADM1815-R22AKS-RL7.