Analog Devices Inc. ADM825YYKS-R7

Overview

ADM825YYKS-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 voltage monitoring in automotive-grade systems. It features a 2.19 V reset threshold (±0.06 V over −40°C to +125°C), 140 ms minimum reset timeout, 5 µA typical supply current, and operates down to VCC = 1 V. It is used in portable instrumentation where brownout resilience and external reset initiation are required.

For engineers reviewing the ADM825YYKS-R7 datasheet, ADM825YYKS-R7 pinout, ADM825YYKS-R7 application, or ADM825YYKS-R7 equivalent, key selection criteria include reset threshold accuracy at temperature extremes, MR input pulse width tolerance (≥1 µs), guaranteed reset validity below 1 V, and SC70-5 package compatibility with space-constrained PCB layouts.

Technical Context

The ADM825YYKS-R7 implements a precision bandgap-based reset comparator with 40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring stable trip point across −40°C to +125°C. Its internal 52 kΩ MR pull-up eliminates external biasing, and integrated debounce rejects <100 ns glitches on the manual reset line.

Unlike the ADM823/ADM824 variants, the ADM825YYKS-R7 omits watchdog functionality but provides dual RESET/RESET outputs - one active-low and one active-high - both push-pull, enabling direct interface with microcontrollers requiring either polarity without external inverters or pull resistors.

Key Specifications

Pinout & Package

ADM825YYKS-R7 is housed in a 5-lead SC70 (KS-5) package - 2.0 mm × 1.25 mm × 0.9 mm, JEDEC MO-203-AA compliant - optimized for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM825YYKS-R7, ADM825RYRJZ-R7 offers identical functionality in a larger, more manufacturable package but targets 2.7 V rails, while MAX6326UT23D3+T reduces current draw slightly but sacrifices dual outputs and integrated MR biasing - limiting suitability for compact, low-BOM-count designs.

Availability

ADM825YYKS-R7 is available at Aetrix Electronics and suitable for industrial sensor nodes, automotive body control modules, portable medical instruments, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM825YYKS-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' precision supervisory circuits product line, engineered specifically for reliable power-up/power-down sequencing and brownout protection in harsh-environment microprocessor systems.

FAQ

What is the exact reset threshold voltage of ADM825YYKS-R7 and how does it vary with temperature?

The ADM825YYKS-R7 has a nominal reset threshold of 2.19 V at 25°C, with a guaranteed range of 2.13 V to 2.25 V across −40°C to +125°C. Its temperature coefficient is tightly controlled at 40 ppm/°C, meaning the threshold drifts less than ±12 mV over the full automotive temperature range - critical for stable operation in engine bay or outdoor deployments where ambient swings exceed 160°C.

Does ADM825YYKS-R7 include a watchdog timer function?

No, ADM825YYKS-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). The ADM825YYKS-R7 is optimized for manual-reset-critical applications and provides dual RESET/RESET outputs instead - making it ideal for systems where software supervision is handled externally or unnecessary.

Can ADM825YYKS-R7 operate reliably below 1.8 V supply voltage?

Yes, ADM825YYKS-R7 guarantees valid reset output behavior down to VCC = 1 V, as confirmed in the datasheet's "RESET Output Voltage" specifications. Both RESET (active-low) and RESET (active-high) outputs remain functional and logic-defined at 1 V, enabling use in ultra-low-voltage systems such as energy-harvesting nodes or coin-cell-powered devices where supply may dip below 1.8 V during peak load.

What is the minimum pulse width required on the MR pin to assert reset in ADM825YYKS-R7?

The ADM825YYKS-R7 requires a minimum MR low pulse width of 1 µs to initiate reset, as specified in Table 4 and verified in Figure 13 (Manual Reset Minimum Pulse Width vs. Temperature). This short requirement allows reliable triggering from mechanical switches or GPIO-driven resets without added timing circuitry - and the integrated 52 kΩ internal pull-up ensures MR defaults high when unconnected.

Is ADM825YYKS-R7 RoHS compliant and what package does it use?

Yes, ADM825YYKS-R7 is RoHS compliant (denoted by the "Z" suffix per Analog Devices ordering guide) and uses the 5-lead SC70 (KS-5) package - measuring 2.0 mm × 1.25 mm × 0.9 mm with 0.65 mm lead pitch. This JEDEC MO-203-AA-compliant package supports fine-pitch reflow assembly and is widely supported by contract manufacturers for high-volume portable electronics.