Analog Devices Inc. ADM823LYKS-R7

Overview

ADM823LYKS-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, designed for microprocessor supply voltage monitoring and code execution integrity assurance. It features a 4.63 V reset threshold, 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates across −40°C to +125°C for automotive-grade reliability.

For engineers reviewing the ADM823LYKS-R7 datasheet, ADM823LYKS-R7 pinout, ADM823LYKS-R7 application, or ADM823LYKS-R7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), guaranteed reset validity down to VCC = 1 V, low 5 µA quiescent current, SC70-5 package footprint, and compatibility with manual reset push-button interfaces in safety-critical embedded systems.

Technical Context

The ADM823LYKS-R7 implements a precision bandgap-based voltage reference with 40 ppm/°C temperature coefficient and 10 mV hysteresis to ensure stable reset assertion during brownout recovery. Its internal watchdog timer clears on any logic transition at WDI (min. 50 ns pulse width) and asserts reset if unattended for ≥1.12 sec.

It integrates debounced manual reset input with 52 kΩ internal pull-up and 1 µs minimum pulse width requirement, while the push-pull RESET output guarantees logic-low state down to VCC = 1 V with 3.2 mA sink capability at VTH min - enabling robust interfacing with 3.3 V and 5 V microcontrollers without external level-shifting.

Key Specifications

Pinout & Package

ADM823LYKS-R7 is housed in a 5-lead SC70 (KS-5) package, measuring 2.00 mm × 1.25 mm × 0.90 mm (L × W × H), with gull-wing leads and JEDEC MO-203-AA compliance. The compact footprint supports high-density PCB layouts in space-constrained portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supervisory circuit applications.

Compared with ADM823LYKS-R7, MAX6326UT46D3+T offers lower cost but omits watchdog protection essential for autonomous recovery, while TPS3808G33DBVR provides flexibility in timeout tuning but mandates hardware revision and software revalidation due to voltage and pinout mismatch.

Availability

ADM823LYKS-R7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM823LYKS-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 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 ADM823 family belongs to Analog Devices' precision supervisory IC product line, engineered specifically for fail-safe microprocessor reset and watchdog supervision in mission-critical automotive and industrial systems.

FAQ

What is the reset threshold voltage of the ADM823LYKS-R7?

The ADM823LYKS-R7 has a nominal reset threshold voltage of 4.63 V, with a tolerance of ±2.5% over the full operating temperature range of −40°C to +125°C. This value is factory-trimmed and specified in Table 2 of the Rev. D datasheet under "ADM82xL" variant conditions. The threshold remains stable with a temperature coefficient of 40 ppm/°C, ensuring consistent behavior across thermal extremes encountered in automotive under-hood applications.

Does the ADM823LYKS-R7 include a watchdog timer?

Yes, the ADM823LYKS-R7 includes an integrated watchdog timer with a typical timeout period of 1.6 seconds, ranging from 1.12 to 2.40 seconds over temperature. The timer is cleared by any logic transition (rising or falling edge) on the WDI pin and asserts reset if no transition occurs within the timeout window. This feature is confirmed in the Functional Block Diagram (Figure 1), Selection Table (Table 1), and Specifications section (Table 2) of the ADM823/ADM824/ADM825 Rev. D datasheet.

What package type is used for the ADM823LYKS-R7?

The ADM823LYKS-R7 is packaged in a 5-lead SC70 (KS-5) outline, compliant with JEDEC MO-203-AA standards. Its dimensions are 2.00 mm × 1.25 mm × 0.90 mm, with gull-wing leads optimized for surface-mount assembly. This information is explicitly stated in the Ordering Guide (Page 11) and Outline Dimensions (Figure 20) of the Rev. D datasheet, and the "YKS" suffix in the part number denotes the SC70 package variant.

Can the ADM823LYKS-R7 operate with supply voltages below 2.0 V?

No - the ADM823LYKS-R7 requires a minimum VCC of 1.2 V to function across its full temperature range (−40°C to +125°C), and 1.0 V for limited operation at 0°C to 70°C per Table 2. While its RESET output remains valid down to VCC = 1 V, the device itself does not operate reliably below 1.2 V at automotive temperatures. Operation below this violates Absolute Maximum Ratings and is unsupported per the datasheet's "VCC Operating Voltage Range" specification.

Is there a manual reset input on the ADM823LYKS-R7?

Yes, the ADM823LYKS-R7 includes a dedicated manual reset input (MR) on Pin 3. It is active-low, features an internal 52 kΩ pull-up resistor, and requires a minimum 1 µs low pulse to assert reset. The MR pin also includes on-chip debounce and rejects noise spikes ≤100 ns, as documented in Table 4 (Pin Function Descriptions), the Selection Table (Table 1), and the Circuit Description section (Page 9) of the Rev. D datasheet.