Analog Devices Inc. ADM823RYKS-R7

Overview

ADM823RYKS-R7 from Analog Devices is a precision supervisory circuit with watchdog timer and manual reset input, designed for microprocessor supply voltage monitoring in automotive-grade systems. It features a 2.63 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 guaranteed output validity - used in engine control units and battery-powered industrial controllers.

For engineers reviewing the ADM823RYKS-R7 datasheet, ADM823RYKS-R7 pinout, ADM823RYKS-R7 application, or ADM823RYKS-R7 equivalent, key selection criteria include reset threshold accuracy across −40°C to +125°C, watchdog pulse width tolerance (50 ns min), MR input glitch rejection (100 ns), internal 52 kΩ pull-up on MR, and SC70-5 package compatibility with space-constrained PCB layouts.

Technical Context

The ADM823RYKS-R7 integrates a precision voltage reference, comparator-based reset generator, and monostable watchdog timer with edge-triggered WDI input. Its reset assertion logic combines three independent conditions: VCC falling below 2.63 V (with 5 mV hysteresis), MR pin pulled low ≥1 µs, or WDI idle >1.6 sec - all forcing active-low RESET for ≥140 ms after condition release.

It uses an internal bandgap reference and trimmed comparator to achieve ±0.5% reset threshold accuracy at 25°C and ±40 ppm/°C temperature coefficient. The push-pull output stage sinks 1.2 mA at VCC = VTHmin and remains functional down to VCC = 1 V, enabling brownout detection in low-voltage microcontroller domains.

Key Specifications

Pinout & Package

ADM823RYKS-R7 is housed in a 5-lead SC70 (KS-5) package, measuring 2.00 mm × 1.25 mm × 0.90 mm, with gull-wing leads and JEDEC MO-203-AA compliance. This ultra-compact footprint supports high-density automotive PCB layouts while maintaining thermal resistance of 146°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM823RYKS-R7, MAX6326UT26D3+T omits watchdog functionality entirely, while TPS3808G12QDBVRQ1 trades manual reset integration for slightly tighter reset timing and higher supply current - neither offers the combined watchdog + MR + SC70 advantage of ADM823RYKS-R7.

Availability

ADM823RYKS-R7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and battery-powered data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM823RYKS-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 and industrial microprocessor supervision, emphasizing precision threshold stability, low-power operation, and integrated fault-detection features across extreme temperatures.

FAQ

What is the exact reset threshold voltage of ADM823RYKS-R7 and its tolerance over temperature?

The ADM823RYKS-R7 has a nominal reset threshold of 2.63 V at 25°C, with a guaranteed range of 2.55 V to 2.70 V over the full −40°C to +125°C operating temperature range. This 150 mV total window includes ±40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring robust brownout detection in automotive power rails.

Does ADM823RYKS-R7 support both watchdog and manual reset functions simultaneously?

Yes, ADM823RYKS-R7 integrates both watchdog timer and manual reset input as core features. The WDI pin accepts edge-triggered pulses to clear the 1.6 sec timeout, while the MR pin (with internal 52 kΩ pull-up) asserts reset when driven low for ≥1 µs - both independently trigger the same active-low RESET output.

What package type and dimensions does ADM823RYKS-R7 use?

ADM823RYKS-R7 is packaged in a 5-lead SC70 (KS-5) outline per JEDEC MO-203-AA, measuring 2.00 mm × 1.25 mm × 0.90 mm with 0.65 mm lead pitch. Its gull-wing leads and low profile enable placement in space-constrained automotive modules and portable industrial sensors.

Can ADM823RYKS-R7 operate reliably when VCC drops below 2.0 V?

Yes, ADM823RYKS-R7 guarantees valid RESET output down to VCC = 1 V, including proper logic levels and timing. Its push-pull driver maintains sink capability (≥1.2 mA) and defined voltage margins even at 1 V, enabling safe microprocessor halt during deep brownout events.

How does the watchdog timer in ADM823RYKS-R7 respond to WDI pin states?

The ADM823RYKS-R7 watchdog timer clears on every logic transition (low-to-high or high-to-low) at the WDI pin, accepting pulses as narrow as 50 ns. If WDI remains static for >1.6 sec (1.12–2.40 sec range), it asserts RESET. Leaving WDI floating disables the watchdog function entirely.