Analog Devices Inc. ADM823ZYKS-R7

Overview

ADM823ZYKS-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, designed for power supply monitoring and microprocessor system integrity assurance. It features a 2.32 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 in automotive-grade applications including engine control units and battery management systems.

For engineers reviewing the ADM823ZYKS-R7 datasheet, ADM823ZYKS-R7 pinout, ADM823ZYKS-R7 application, or ADM823ZYKS-R7 equivalent, key selection criteria include reset threshold accuracy (±25 mV over temperature), guaranteed reset validity down to VCC = 1 V, low 5 µA quiescent current, SC70-5 package footprint, and compatibility with brownout detection and software crash recovery in safety-critical embedded controllers.

Technical Context

The ADM823ZYKS-R7 implements a precision voltage monitor with internal bandgap reference and hysteresis (5 mV), coupled to a digital reset generator and watchdog timer with glitch-immune input logic. Its reset assertion is triggered by VCC falling below 2.32 V (±25 mV), MR pin low pulse ≥1 µs, or WDI inactivity exceeding 1.6 sec - all independently validated against automotive temperature extremes.

It integrates on-chip debounce for MR, a 52 kΩ internal pull-up on MR, and a window comparator that disables watchdog action when WDI is floating. The push-pull RESET output guarantees logic-low state at VCC ≥ 1 V with 3.2 mA sink capability, enabling direct interface with microcontroller reset inputs without external pull-down resistors.

Key Specifications

Pinout & Package

ADM823ZYKS-R7 is housed in a 5-lead SC70 (KS-5) package, measuring 2.00 mm × 1.25 mm × 0.90 mm, optimized for space-constrained automotive PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT23D3+T and TPS3808G12QDBVRQ1, ADM823ZYKS-R7 uniquely combines 2.32 V threshold, integrated watchdog timer, manual reset input, and SC70-5 packaging - making it the sole option among the three for space-constrained automotive systems requiring full reset + watchdog + MR functionality.

Availability

ADM823ZYKS-R7 is available at Aetrix Electronics and suitable for engine control units, ADAS domain controllers, and battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM823ZYKS-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.

The ADM823 family delivers automotive-qualified supervisory functions - specifically engineered for robust power sequencing, brownout resilience, and firmware crash recovery in safety-critical microprocessor systems.

FAQ

What is the exact reset threshold voltage of ADM823ZYKS-R7 and how does it vary with temperature?

The ADM823ZYKS-R7 has a nominal reset threshold of 2.32 V at 25°C, with a guaranteed range of 2.25 V to 2.38 V across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤12 mV total drift over the full automotive temperature range - ensuring consistent brownout detection in under-hood environments where ADM823ZYKS-R7 is deployed.

Does ADM823ZYKS-R7 support operation below 2.32 V, and what happens to the RESET output when VCC drops near 1 V?

Yes, ADM823ZYKS-R7 remains functional down to VCC = 1.2 V and guarantees valid RESET output down to VCC = 1 V. At VCC = 1 V, the push-pull output maintains logic-low state with 50 µA sink capability, enabling reliable reset assertion even during severe brownout conditions - a critical feature confirmed in ADM823ZYKS-R7's automotive qualification testing.

Can ADM823ZYKS-R7 be used without connecting the WDI pin, and what is the effect on watchdog functionality?

Yes, ADM823ZYKS-R7 can be used with WDI left unconnected. In this state, an internal window comparator disables the watchdog timer, preventing spurious resets. This behavior is explicitly documented and allows ADM823ZYKS-R7 to operate as a pure voltage supervisor when watchdog functionality is not required - preserving design flexibility without compromising ADM823ZYKS-R7 reliability.

What is the minimum pulse width required on the MR pin to trigger a reset in ADM823ZYKS-R7?

The ADM823ZYKS-R7 requires a minimum MR low pulse width of 1 µs to assert reset, with typical glitch rejection of 100 ns. This specification holds across the full −40°C to +125°C temperature range, as verified in Figure 13 of the datasheet - ensuring robust manual reset activation in noisy automotive environments where ADM823ZYKS-R7 is commonly applied.

Is ADM823ZYKS-R7 pin-compatible with other members of the ADM823 family, and what package does it use?

Yes, ADM823ZYKS-R7 uses the 5-lead SC70 (KS-5) package and shares identical pinout with all ADM823 variants in SC70 - including ADM823LYKSZ-R7, ADM823MYKSZ-R7, and ADM823TYKSZ-R7. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC - enabling drop-in replacement across threshold variants without PCB modification for ADM823ZYKS-R7 designs.