Analog Devices Inc. ADM825RYRJZ-R7

Overview

ADM825RYRJZ-R7 from Analog Devices is a supervisory circuit with manual reset input and dual push-pull reset outputs, designed for microprocessor supply voltage monitoring and system-level fault recovery. It features a 2.63 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 for automotive-grade reliability.

For engineers reviewing the ADM825RYRJZ-R7 datasheet, ADM825RYRJZ-R7 pinout, ADM825RYRJZ-R7 application, or ADM825RYRJZ-R7 equivalent, key selection criteria include its SOT-23-5 package, absence of watchdog timer (distinguishing it from ADM823/ADM824), manual reset pulse width tolerance (≥1 µs), internal 52 kΩ MR pull-up, and dual active-low/active-high RESET outputs for flexible logic interface.

Technical Context

The ADM825RYRJZ-R7 implements a precision bandgap-based voltage reference and comparator to monitor VCC against a fixed 2.63 V threshold with 40 ppm/°C temperature coefficient and 5 mV hysteresis. Its reset generator asserts both RESET (active low) and RESET (active high) simultaneously upon undervoltage, MR assertion, or timeout expiration.

Unlike ADM823/ADM824, the ADM825RYRJZ-R7 omits watchdog functionality entirely - no WDI pin, no timeout supervision of code execution. Its MR input includes on-chip debounce and rejects transients <100 ns, enabling robust push-button reset in noisy environments without external RC filtering.

Key Specifications

Pinout & Package

ADM825RYRJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch, 2.90 mm × 1.60 mm body, and 1.10 mm max height - compatible with standard pick-and-place and reflow processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM825RYRJZ-R7, ADM825RYRJ-R7 offers identical functionality with alternate branding, while TPS3808G12DBVR provides lower quiescent current but sacrifices dual-output flexibility, MR integration, and automotive temperature support - making it a partial substitute only in non-automotive, single-threshold designs.

Availability

ADM825RYRJZ-R7 is available at Aetrix Electronics and suitable for automotive engine control, industrial programmable logic controllers, medical infusion pumps, and ADAS camera modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for ADM825RYRJZ-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 leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The ADM825 belongs to Analog Devices' supervisory circuits product line, engineered specifically for robust power monitoring and fault recovery in automotive, industrial, and medical electronics where deterministic reset behavior under voltage stress is critical.

FAQ

What is the reset threshold voltage of the ADM825RYRJZ-R7?

The ADM825RYRJZ-R7 has a nominal reset threshold of 2.63 V, specified from 2.55 V to 2.70 V over the full −40°C to +125°C operating temperature range. This value is factory-trimmed and does not require external adjustment, making it suitable for 2.7 V system rails where precise brownout detection is required. The ADM825RYRJZ-R7 uses an internal bandgap reference with 40 ppm/°C temperature coefficient to maintain accuracy across thermal extremes.

Does the ADM825RYRJZ-R7 include a watchdog timer function?

No, the ADM825RYRJZ-R7 does not include a watchdog timer. Unlike the ADM823 and ADM824 variants, the ADM825RYRJZ-R7 is configured exclusively for voltage supervision and manual reset - it lacks the WDI (watchdog input) pin and associated timing circuitry. This simplifies firmware design in applications where software execution integrity is monitored externally or deemed unnecessary, and reduces pin count and layout complexity.

How does the manual reset (MR) input work on the ADM825RYRJZ-R7?

The MR input on the ADM825RYRJZ-R7 is an active-low, internally pulled-up (52 kΩ) terminal that triggers a full reset when held low for ≥1 µs. No external pull-up resistor is needed. The input includes on-chip debounce and rejects noise spikes <100 ns, allowing direct connection to a momentary push-button switch between MR and GND. Upon MR release, reset remains asserted for the full 140 ms timeout period before deassertion.

What are the output configurations of the ADM825RYRJZ-R7?

The ADM825RYRJZ-R7 provides two independent push-pull reset outputs: Pin 1 (RESET, active low) and Pin 3 (RESET, active high). Both outputs are guaranteed functional down to VCC = 1 V, with low-state voltage ≤0.3 V at 1.2 mA sink and high-state voltage ≥0.8×VCC at 30 µA source. This dual-output architecture eliminates level shifters when interfacing with processors requiring active-low reset and companion ICs requiring active-high enable signals.

Is the ADM825RYRJZ-R7 RoHS compliant and what package does it use?

Yes, the ADM825RYRJZ-R7 is RoHS compliant (indicated by the "Z" suffix) and packaged in a 5-lead SOT-23 (RJ-5) outline per JEDEC MO-178-AA. The package measures 2.90 mm × 1.60 mm × 1.10 mm max, with 0.95 mm lead pitch and gull-wing leads compatible with standard surface-mount assembly processes. Its small footprint and automotive qualification make it ideal for space-constrained, high-reliability applications.