Analog Devices Inc. ADM823TYRJZ-R7

Overview

ADM823TYRJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, designed for power supply monitoring and microprocessor code integrity supervision in automotive-grade embedded systems. It features a 2.63 V reset threshold (typical), 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates across −40°C to +125°C.

For engineers reviewing the ADM823TYRJZ-R7 datasheet, ADM823TYRJZ-R7 pinout, ADM823TYRJZ-R7 application, or ADM823TYRJZ-R7 equivalent, this device supports critical brownout detection, fail-safe watchdog recovery, and external push-button reset assertion in space-constrained SOT-23 designs requiring AEC-Q100-aligned reliability.

Technical Context

The ADM823TYRJZ-R7 implements a precision voltage monitor with internal bandgap reference and hysteresis (5 mV), combined with a monostable watchdog timer cleared by WDI transitions. Its reset generator asserts active-low RESET for ≥140 ms after VCC rises above 2.63 V (±30 mV over temperature), ensuring stable microprocessor initialization.

It integrates a 52 kΩ internal MR pull-up, glitch-immune MR input (100 ns rejection), and WDI interface tolerant of 50 ns pulses. The push-pull output guarantees valid logic levels down to VCC = 1 V, supporting low-voltage brownout detection without external components.

Key Specifications

Pinout & Package

ADM823TYRJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package, 2.90 mm × 1.60 mm × 1.15 mm body size, compliant with JEDEC MO-178-AA, suitable for automated placement and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT26D3+ and TPS3808G33DBVR, ADM823TYRJZ-R7 uniquely combines fixed 2.63 V threshold, integrated watchdog, manual reset, and automotive temperature range in a standard 5-pin SOT-23 - enabling drop-in replacement in legacy 2.7 V–3.0 V systems without redesign.

Availability

ADM823TYRJZ-R7 is available at Aetrix Electronics and suitable for automotive engine control, industrial PLCs, and medical infusion pumps requiring stable component supply with guaranteed long-term sourcing and RoHS compliance.

Supply support for ADM823TYRJZ-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM823 family delivers automotive-qualified power supervision with integrated watchdog and manual reset - engineered for reliability-critical microprocessor systems where deterministic reset behavior and code integrity are mandatory.

FAQ

What is the exact reset threshold voltage of ADM823TYRJZ-R7 and how does it vary with temperature?

The ADM823TYRJZ-R7 has a nominal reset threshold of 2.63 V at 25°C, with a guaranteed range of 2.55 V to 2.70 V across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤±12 mV drift over full automotive temperature range - sufficient for stable operation on 2.7 V–3.0 V rails without calibration.

Does ADM823TYRJZ-R7 support operation down to 1 V supply voltage, and what happens to the RESET output below that?

Yes, ADM823TYRJZ-R7 guarantees valid RESET output down to VCC = 1 V, with sink capability of 50 µA at that level. Below 1 V, the output is not specified; however, an external 100 kΩ pull-down resistor on RESET ensures logic-low assertion even at VCC = 0 V, preserving system safety during deep undervoltage events.

How does the watchdog timer in ADM823TYRJZ-R7 respond to WDI pin states, and what is the minimum pulse width it accepts?

The ADM823TYRJZ-R7 watchdog timer clears on any logic transition (low-to-high or high-to-low) on WDI and times out after 1.12–2.40 sec if no transition occurs. It accepts pulses as narrow as 50 ns, enabling efficient low-duty-cycle strobing from microcontrollers with minimal current draw - especially when WDI is held low between toggles.

Is the manual reset input (MR) of ADM823TYRJZ-R7 internally pulled up, and what is its glitch rejection capability?

Yes, ADM823TYRJZ-R7 includes a factory-trimmed 52 kΩ internal pull-up on MR, eliminating external biasing. Its on-chip debounce rejects fast transients ≤100 ns, preventing false resets from ESD or board-level noise - verified per typical performance curves in the datasheet Figure 9 and Figure 13.

What package type and marking code does ADM823TYRJZ-R7 use, and is it RoHS compliant?

ADM823TYRJZ-R7 uses the 5-lead SOT-23 (RJ-5) package with M4L laser marking, per the Analog Devices ordering guide. The "Z" suffix confirms full RoHS compliance (Pb-free, halogen-free), and the device meets JEDEC MO-178-AA mechanical standards for automated assembly and thermal reliability.