Analog Devices Inc. ADM825SYKSZ-R7

Overview

ADM825SYKSZ-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 2.93 V reset threshold (±50 mV over temperature), 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C. It is used in engine control units to ensure deterministic restart during brownout conditions.

For engineers reviewing the ADM825SYKSZ-R7 datasheet, ADM825SYKSZ-R7 pinout, ADM825SYKSZ-R7 application, or ADM825SYKSZ-R7 equivalent, key selection criteria include reset threshold accuracy, manual reset timing integrity, dual-output drive capability, and SC70 package suitability for space-constrained automotive PCBs.

Technical Context

The ADM825SYKSZ-R7 implements a precision bandgap-based voltage reference with 40 ppm/°C temperature coefficient and 5 mV hysteresis to detect VCC drops below 2.93 V. Its reset generator asserts both RESET (active low) and RESET (active high) outputs simultaneously when VCC falls below threshold, MR is pulled low, or after power-up stabilization delay.

Unlike ADM823/ADM824, this variant omits watchdog functionality but integrates a 52 kΩ internal pull-up on MR and guarantees valid output states for VCC ≥ 1 V. The dual push-pull outputs eliminate external pull resistors and support direct interfacing with microcontroller reset inputs requiring either polarity.

Key Specifications

Pinout & Package

ADM825SYKSZ-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 routing in engine control and ADAS modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US29D3+T and TPS3808G33DBVR, ADM825SYKSZ-R7 uniquely delivers dual-polarity push-pull outputs in SC70 with automotive temperature rating and integrated MR pull-up-enabling smaller footprint, lower BOM count, and higher functional safety readiness in ECU and EPS applications.

Availability

ADM825SYKSZ-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 ADM825SYKSZ-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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The ADM825 belongs to Analog Devices' automotive-qualified supervisory IC product line, engineered specifically for deterministic power-on reset, brownout protection, and manual recovery in safety-critical vehicle subsystems.

FAQ

What is the exact reset threshold voltage of ADM825SYKSZ-R7 and how does it vary with temperature?

The ADM825SYKSZ-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 the full −40°C to +125°C operating temperature range. Its temperature coefficient is specified at 40 ppm/°C, meaning threshold drift is tightly controlled to ensure consistent brownout detection in under-hood environments. This specification is validated per the ADM825 data sheet Rev. D, Table 2.

Does ADM825SYKSZ-R7 include a watchdog timer function?

No, ADM825SYKSZ-R7 does not include a watchdog timer. Per Table 1 in the ADM823/ADM824/ADM825 data sheet Rev. D, the ADM825 variant is defined by manual reset (MR) support and dual push-pull outputs, but explicitly excludes watchdog input (WDI). Watchdog functionality is present only in ADM823 and ADM824 variants.

What package type and dimensions does ADM825SYKSZ-R7 use?

ADM825SYKSZ-R7 uses the 5-lead SC70 (KS-5) package, compliant with JEDEC MO-203-AA. Its dimensions are 2.00 mm × 1.25 mm × 0.90 mm, with 0.65 mm pitch gull-wing leads. This ultra-compact footprint is optimized for high-density automotive PCBs where space is constrained, such as in camera modules and ECU daughterboards.

How does the manual reset (MR) input behave on ADM825SYKSZ-R7?

The MR input on ADM825SYKSZ-R7 is active-low with an internal 52 kΩ pull-up resistor, ensuring a defined high state when unconnected. A minimum 1 µs low pulse reliably triggers reset assertion, and the input rejects glitches shorter than 100 ns. After MR returns high, reset remains asserted for the full 140 ms timeout period before deassertion - behavior confirmed in the Functional Block Diagram and Table 4 of the data sheet.

Can ADM825SYKSZ-R7 operate with VCC below 2.7 V?

Yes, ADM825SYKSZ-R7 is specified to operate with VCC as low as 2.38 V for the Z-grade and 2.25 V for the Y-grade, but ADM825SYKSZ-R7 is the S-grade variant with a 2.7 V to 3.6 V operating range. Its reset outputs remain valid down to VCC = 1 V, enabling robust behavior during deep brownout - a key feature verified in the "RESET Output Voltage" section of Table 2 (Rev. D, Page 3).