Analog Devices Inc. ADM825SYKS-R7

Overview

ADM825SYKS-R7 from Analog Devices is a supervisory circuit with manual reset input and dual push-pull reset outputs, designed to monitor 2.93 V supply rails in microprocessor systems. It provides 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C. Used in automotive engine control units for reliable power-on and brownout reset generation.

For engineers reviewing the ADM825SYKS-R7 datasheet, ADM825SYKS-R7 pinout, ADM825SYKS-R7 application, or ADM825SYKS-R7 equivalent, key selection criteria include reset threshold accuracy (2.89 V to 2.96 V at 25°C), manual reset pulse width (≥1 µs), internal MR pull-up (52 kΩ), and SC70-5 package compatibility with space-constrained PCB layouts.

Technical Context

The ADM825SYKS-R7 implements a precision voltage comparator with 10 mV hysteresis and 40 ppm/°C temperature coefficient to detect VCC drops below 2.93 V nominal threshold. Its dual push-pull RESET/RESET outputs drive active-low and active-high signals simultaneously without external components.

Unlike ADM823/ADM824, this variant omits watchdog functionality but integrates debounced manual reset input (MR) with 500 ns MR-to-reset delay and 100 ns glitch rejection. The circuit asserts reset during power-up, brownout, or external push-button activation, holding output for ≥140 ms after VCC recovery.

Key Specifications

Pinout & Package

ADM825SYKS-R7 uses a 5-lead SC70 (KS-5) package measuring 2.00 mm × 1.25 mm × 0.90 mm with 0.65 mm pitch, optimized for high-density automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM825SYKS-R7, ADM825SYRJZ-R7 offers identical supervision functionality in a larger SOT-23 package for easier assembly, while TPS3808G33DBVR provides basic 3.3 V monitoring without manual reset or complementary outputs-making it suitable only for non-safety-critical, single-output reset applications.

Availability

ADM825SYKS-R7 is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, infotainment head units, and electric power steering systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM825SYKS-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 ADM825 belongs to Analog Devices' precision supervisory circuit product line, engineered specifically for automotive-grade power monitoring with manual reset capability and dual-output flexibility in compact packages.

FAQ

What is the exact reset threshold voltage range for ADM825SYKS-R7 at 25°C?

The ADM825SYKS-R7 has a nominal reset threshold of 2.93 V, with a specified range of 2.89 V to 2.96 V at 25°C. This tolerance ensures reliable detection of 3.3 V rail brownout conditions while accommodating process variation across production lots. The device maintains this accuracy across its full operating temperature range of −40°C to +125°C, with a temperature coefficient of 40 ppm/°C.

Does ADM825SYKS-R7 include a watchdog timer function?

No, ADM825SYKS-R7 does not include a watchdog timer. As confirmed in Table 1 of the datasheet, the ADM825 variant is defined by manual reset (MR) input and dual push-pull RESET/RESET outputs-but explicitly excludes watchdog input (WDI). Watchdog functionality is present only in ADM823 and ADM824 variants. The ADM825SYKS-R7 is optimized for applications requiring robust manual reset capability without code-execution monitoring.

What package type and dimensions does ADM825SYKS-R7 use?

ADM825SYKS-R7 uses the 5-lead SC70 package (JEDEC MO-203-AA, Analog Devices KS-5), measuring 2.00 mm × 1.25 mm × 0.90 mm with 0.65 mm lead pitch. Its compact footprint is 40% smaller than equivalent SOT-23 devices, making it ideal for space-constrained automotive modules. The SC70 package is RoHS-compliant and rated for reflow soldering per JEDEC J-STD-020.

How does the manual reset (MR) input behave on ADM825SYKS-R7?

The MR input on ADM825SYKS-R7 is an active-low signal with a built-in 52 kΩ pull-up resistor, eliminating the need for external components. A logic-low pulse ≥1 µs triggers reset assertion, and the output remains active for ≥140 ms after MR returns high. The input rejects glitches <100 ns and features on-chip debounce, enabling direct connection to mechanical push buttons without additional filtering capacitors in most automotive environments.

Can ADM825SYKS-R7 operate reliably at VCC = 1.2 V?

Yes, ADM825SYKS-R7 guarantees valid RESET and RESET output states down to VCC = 1 V, as stated in the datasheet's "Guaranteed reset output valid to VCC = 1 V" feature. At VCC = 1.2 V, both outputs remain functional: the active-low RESET sinks 50 µA with 0.3 V max drop, and the active-high RESET sources 30 µA with 0.8 × VCC min high-level voltage. This enables fail-safe operation during deep brownout events common in automotive stop-start systems.