Analog Devices Inc. ADM825MYKS-R7

Overview

ADM825MYKS-R7 from Analog Devices is a supervisory circuit with manual reset input and dual active-low/active-high push-pull reset outputs, designed for microprocessor supply voltage monitoring in automotive-grade systems. It features a 4.38 V reset threshold (typ), 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C. Used in engine control units and industrial PLCs to ensure reliable power-on and brownout recovery.

For engineers reviewing the ADM825MYKS-R7 datasheet, ADM825MYKS-R7 pinout, ADM825MYKS-R7 application, or ADM825MYKS-R7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), manual reset pulse width tolerance (≥1 µs), glitch immunity against <100 ns transients, and SC70-5 package compatibility with high-density PCB layouts.

Technical Context

The ADM825MYKS-R7 implements a precision bandgap-based voltage reference with 40 ppm/°C temperature coefficient and 5 mV hysteresis to reject noise-induced false resets. Its dual push-pull RESET/RESET outputs drive both active-low and active-high logic inputs without external pull resistors.

Unlike the ADM823/ADM824 variants, the ADM825MYKS-R7 omits watchdog functionality but integrates a 52 kΩ internal MR pull-up resistor and debounced manual reset detection with 500 ns propagation delay. Reset assertion persists for ≥140 ms after VCC rises above 4.38 V or MR transitions high.

Key Specifications

Pinout & Package

ADM825MYKS-R7 uses a 5-lead SC70 (KS-5) package with 0.65 mm pitch, compliant to JEDEC MO-203-AA. The package measures 2.00 mm × 1.25 mm × 0.90 mm and supports reflow soldering per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM825MYKS-R7, MAX6326TUT43D+T requires external components for pull-up and lacks MR integration, while TPS3808G33DBVR cannot support 4.38 V threshold or manual reset-making ADM825MYKS-R7 uniquely suited for automotive 4.5 V rails requiring field-serviceable reset.

Availability

ADM825MYKS-R7 is available at Aetrix Electronics and suitable for engine control units, industrial PLCs, automotive body control modules, and railway signaling interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM825MYKS-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 ADM825MYKS-R7 belongs to Analog Devices' automotive-qualified supervisory IC family, engineered specifically for robust power monitoring in harsh environments where reliability under voltage transients and extreme temperatures is non-negotiable.

FAQ

What is the exact reset threshold voltage of ADM825MYKS-R7 and how does it vary with temperature?

The ADM825MYKS-R7 has a nominal reset threshold of 4.38 V at 25°C, with a guaranteed range of 4.25 V to 4.50 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. This precision ensures consistent brownout detection without calibration in ECU or BCM designs.

Does ADM825MYKS-R7 include a watchdog timer function?

No, ADM825MYKS-R7 does not include a watchdog timer. Per the Analog Devices ADM823/ADM824/ADM825 selection table, only ADM823 and ADM824 variants feature watchdog input (WDI). ADM825MYKS-R7 is optimized for manual reset applications and provides dual push-pull RESET/RESET outputs instead.

What is the minimum pulse width required on the MR pin of ADM825MYKS-R7 to trigger a reset?

The ADM825MYKS-R7 requires a minimum MR pulse width of 1 µs to assert reset. This specification is guaranteed across −40°C to +125°C and is supported by on-chip debounce circuitry that rejects glitches shorter than 100 ns. The internal 52 kΩ pull-up ensures MR remains high when unconnected.

Can ADM825MYKS-R7 operate reliably at VCC = 1 V, and what reset behavior is guaranteed at that level?

Yes, ADM825MYKS-R7 guarantees valid reset output states down to VCC = 1 V. At this voltage, the active-low RESET pin sinks 50 µA while maintaining ≤0.3 V, and the active-high RESET pin sources 30 µA while holding ≥0.8×VCC. This ensures deterministic reset signaling during deep brownout recovery sequences.

Which package type and dimensions does ADM825MYKS-R7 use, and is it RoHS-compliant?

ADM825MYKS-R7 uses the 5-lead SC70 (KS-5) package per JEDEC MO-203-AA, measuring 2.00 mm × 1.25 mm × 0.90 mm with 0.65 mm lead pitch. The "Z" suffix in the ordering code confirms RoHS compliance. This compact footprint supports high-density routing in automotive sensor modules and infotainment head units.