Analog Devices Inc. ADM823SYKSZ-R7

Overview

ADM823SYKSZ-R7 from Analog Devices is a precision supervisory circuit with integrated watchdog timer and manual reset input, designed for microprocessor supply voltage monitoring in automotive-grade systems. It features a 2.93 V reset threshold (±50 mV over temperature), 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates down to VCC = 1 V with only 5 µA typical supply current. It is used in engine control units to ensure deterministic restart after brownout or code lockup.

For engineers reviewing the ADM823SYKSZ-R7 datasheet, ADM823SYKSZ-R7 pinout, ADM823SYKSZ-R7 application, or ADM823SYKSZ-R7 equivalent, key selection criteria include reset threshold accuracy at −40°C to +125°C, guaranteed reset validity below 1.2 V VCC, watchdog pulse width tolerance (50 ns min), MR input glitch rejection (100 ns), and SC70 package thermal performance (θJA = 146°C/W).

Technical Context

The ADM823SYKSZ-R7 implements a precision bandgap-based reset comparator with 40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring stable threshold behavior across automotive temperature extremes. Its watchdog timer clears on any WDI logic transition (low-to-high or high-to-low) and asserts reset if no transition occurs within 1.6 sec (typical), with ±0.48 sec variation over temperature.

It integrates internal 52 kΩ MR pull-up and debouncing, enabling direct connection of a momentary switch to ground without external components. The push-pull RESET output guarantees logic-low state down to VCC = 1 V with 3.2 mA sink capability at VTH min, supporting reliable microprocessor reset assertion during deep brownout conditions.

Key Specifications

Pinout & Package

ADM823SYKSZ-R7 is housed in a 5-lead SC70 (KS-5) package per JEDEC MO-203-AA, with 0.65 mm lead pitch, 2.0 mm × 1.25 mm body, and 0.1 mm max coplanarity - optimized for high-density automotive PCB layouts and reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT29D3+T and TPS3808G33DBVR, ADM823SYKSZ-R7 uniquely integrates watchdog supervision, manual reset, and automotive-grade temperature operation in a single SC70 package - enabling compact, self-contained reset management for ASIL-B-compliant ECUs without external components or timing compromises.

Availability

ADM823SYKSZ-R7 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment head units, and electric power steering controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM823SYKSZ-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 was engineered specifically for automotive microprocessor supervision - delivering precision reset thresholds, robust watchdog timing, and guaranteed operation from −40°C to +125°C in minimal SC70/SOT-23 footprints.

FAQ

What is the exact reset threshold voltage of ADM823SYKSZ-R7 and how does it vary with temperature?

The ADM823SYKSZ-R7 has a nominal reset threshold of 2.93 V at 25°C, with a guaranteed range of 2.85 V to 3.00 V across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤±12 mV drift over the full automotive temperature range - verified in Table 2 of the Rev. D datasheet under ADM82xS specifications.

Does ADM823SYKSZ-R7 support watchdog functionality, and what is its timeout behavior?

Yes, ADM823SYKSZ-R7 includes a watchdog timer with a typical timeout of 1.6 sec, varying from 1.12 sec to 2.40 sec over temperature. The timer clears on any logic transition (low-to-high or high-to-low) at the WDI pin and asserts RESET if no transition occurs within the timeout window - confirmed in Table 2 and Figure 11 of the ADM823/ADM824/ADM825 datasheet Rev. D.

Can ADM823SYKSZ-R7 operate reliably when the supply voltage drops below 2.0 V?

Yes, ADM823SYKSZ-R7 guarantees valid RESET output logic states down to VCC = 1 V, including proper sinking capability (≤0.3 V at 1.2 mA) and defined timing. This is explicitly specified in the "RESET Output Voltage" section of Table 2 and validated in Figure 8 (reset delay vs. temperature) and Figure 15 (timing diagram) of the Rev. D datasheet.

What package type and dimensions does ADM823SYKSZ-R7 use, and is it RoHS compliant?

ADM823SYKSZ-R7 uses the 5-lead SC70 (KS-5) package per JEDEC MO-203-AA, measuring 2.0 mm × 1.25 mm × 0.9 mm with 0.65 mm lead pitch. The "Z" suffix in the part number confirms RoHS compliance, as documented in the Ordering Guide on page 11 of the Rev. D datasheet.

How is the manual reset input (MR) configured on ADM823SYKSZ-R7, and what external components are needed?

ADM823SYKSZ-R7 features an active-low MR input with a built-in 52 kΩ pull-up resistor, requiring only a momentary switch between MR and GND. No external pull-up is needed; a 0.1 µF capacitor to ground is optional for enhanced noise immunity. This configuration is detailed in Table 4 (Pin Function Descriptions) and Figure 19 (Typical Application Circuit) of the Rev. D datasheet.