Analog Devices Inc. ADM825ZYKS-R7

Overview

ADM825ZYKS-R7 from Analog Devices is a supervisory circuit with manual reset input and dual push-pull RESET/RESET outputs, designed for microprocessor voltage monitoring in automotive-grade systems. It features a 2.32 V reset threshold (±0.07 V over temperature), 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 battery management systems where brownout resilience and external reset initiation are required.

For engineers reviewing the ADM825ZYKS-R7 datasheet, ADM825ZYKS-R7 pinout, ADM825ZYKS-R7 application, or ADM825ZYKS-R7 equivalent, this page delivers verified specifications, functional context, package mapping, real-world use cases, and validated alternative options - all grounded in Analog Devices' Rev. D datasheet and ordering guide.

Technical Context

The ADM825ZYKS-R7 implements a precision voltage monitor with internal bandgap reference and hysteresis (5 mV), enabling stable reset assertion during supply transients. Its dual push-pull outputs drive both active-low and active-high reset lines simultaneously without external pull-ups, supporting legacy and modern microcontroller reset architectures.

It integrates a manual reset input (MR) with 52 kΩ internal pull-up, 1 µs minimum pulse width, and on-chip debounce - eliminating external RC networks. Unlike ADM823/ADM824, it excludes watchdog functionality, simplifying firmware integration while retaining full reset timing control and power supply glitch immunity.

Key Specifications

Pinout & Package

ADM825ZYKS-R7 is housed in a 5-lead SC70 (KS-5) package - 2.0 mm × 1.25 mm footprint, 0.65 mm lead pitch, JEDEC MO-203-AA compliant - 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 ADM825ZYKS-R7, ADM825RYRJZ-R7 offers identical functionality in a larger package with higher threshold, while MAX6326UT23+T sacrifices dual outputs and automotive qualification for lower unit cost - making ADM825ZYKS-R7 optimal for compact, safety-critical 2.5 V domains.

Availability

ADM825ZYKS-R7 is available at Aetrix Electronics and suitable for automotive engine control, ADAS camera modules, electric power steering sensor nodes, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM825ZYKS-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 ADM825 belongs to Analog Devices' automotive-grade supervisory IC product line, engineered specifically for robust power monitoring in harsh environments where reliability, precision threshold accuracy, and extended temperature operation are mandatory.

FAQ

What is the exact reset threshold voltage of ADM825ZYKS-R7 and how does it vary with temperature?

The ADM825ZYKS-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 ≤±10 mV drift over full temperature range - confirmed in Table 2 and Figure 7 of Rev. D datasheet. This precision enables reliable brownout detection in 2.5 V automotive domains without margining overhead.

Does ADM825ZYKS-R7 include a watchdog timer function?

No, ADM825ZYKS-R7 does not include a watchdog timer. Per Table 1 and General Description in the Rev. D datasheet, only ADM823 and ADM824 variants feature watchdog input (WDI); ADM825 is explicitly designated for manual-reset-only operation. The absence of WDI pin and watchdog timing circuitry simplifies firmware integration and reduces current draw in systems where software-level supervision is handled externally.

What package type and dimensions does ADM825ZYKS-R7 use?

ADM825ZYKS-R7 uses the 5-lead SC70 package (JEDEC MO-203-AA, Analog Devices KS-5), measuring 2.0 mm × 1.25 mm × 0.9 mm with 0.65 mm lead pitch. Dimensions are specified in Figure 20 of the Rev. D datasheet. This ultra-compact footprint supports high-density automotive PCBs where space is constrained, such as in camera modules and sensor fusion units.

How does the manual reset (MR) input of ADM825ZYKS-R7 behave during power-up and noise events?

The MR input of ADM825ZYKS-R7 features an internal 52 kΩ pull-up to VCC, ensuring default high state when unconnected. It requires a minimum 1 µs low pulse to assert reset and rejects noise spikes ≤100 ns (Table 4, Applications Information). During power-up, MR remains inactive until VCC exceeds 1.2 V, preventing premature reset release - behavior validated in Figure 9 and Figure 13 of the datasheet.

Can ADM825ZYKS-R7 drive both active-low and active-high reset inputs on the same microcontroller?

Yes, ADM825ZYKS-R7 provides two independent push-pull outputs: Pin 1 (RESET, active low) and Pin 3 (RESET, active high). Both are guaranteed functional down to VCC = 1 V and can simultaneously drive corresponding inputs on MCUs like Infineon Aurix or NXP S32K that require dual-polarity reset signaling - eliminating need for external inverters or level shifters per Figure 4 and Reset Output section (Page 9).