Analog Devices Inc. ADM823MYRJZ-R7

Overview

ADM823MYRJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, designed for microprocessor supply voltage monitoring and code execution integrity assurance. It features a 4.38 V reset threshold (±0.07 V), 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates across −40°C to +125°C in automotive-grade SOT-23 packaging.

For engineers reviewing the ADM823MYRJZ-R7 datasheet, ADM823MYRJZ-R7 pinout, ADM823MYRJZ-R7 application, or ADM823MYRJZ-R7 equivalent, key selection criteria include reset threshold accuracy, guaranteed reset validity down to VCC = 1 V, watchdog input timing compatibility, and manual reset pulse width tolerance in harsh environments.

Technical Context

The ADM823MYRJZ-R7 implements a precision bandgap-based voltage reference with 40 ppm/°C temperature coefficient and 5 mV hysteresis to ensure stable reset assertion during brownout conditions. Its internal watchdog detector clears on any logic transition at WDI (min. 50 ns pulse width) and asserts reset if no transition occurs within 1.6 sec (typical).

Reset generation combines three independent triggers: VCC falling below 4.38 V (with 140 ms minimum active duration), MR pin pulled low ≥1 µs, or WDI timeout - all feeding a debounced reset generator with guaranteed push-pull drive capability down to VCC = 1 V.

Key Specifications

Pinout & Package

ADM823MYRJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.90 mm × 1.60 mm body size.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM823MYKSZ-R7, the ADM823MYRJZ-R7 offers superior thermal performance in SOT-23 packaging for higher ambient environments; compared with TPS3808G33DBVR, it delivers essential watchdog and MR capabilities required for safety-critical embedded systems.

Availability

ADM823MYRJZ-R7 is available at Aetrix Electronics and suitable for automotive engine control, industrial PLCs, medical infusion pumps, and ruggedized handheld terminals requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM823MYRJZ-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 ADM823 family belongs to Analog Devices' precision supervisory IC product line, engineered specifically for microprocessor-based systems demanding robust power monitoring, watchdog supervision, and manual reset capability in harsh environments.

FAQ

What is the exact reset threshold voltage of the ADM823MYRJZ-R7?

The ADM823MYRJZ-R7 has a nominal reset threshold of 4.38 V at 25°C, with a guaranteed range of 4.25 V to 4.50 V across the full −40°C to +125°C operating temperature range. This value is factory-trimmed and specified in Table 2 of the Rev. D datasheet under the ADM82xM designation.

Does the ADM823MYRJZ-R7 support both watchdog and manual reset functions?

Yes, the ADM823MYRJZ-R7 integrates both functions: a 1.6 sec typical watchdog timer cleared by transitions on the WDI pin, and an active-low manual reset input (MR) with 52 kΩ internal pull-up and 1 µs minimum pulse width requirement. These are confirmed in Table 1 and Pin Function Descriptions (Page 6).

What package type and dimensions does the ADM823MYRJZ-R7 use?

The ADM823MYRJZ-R7 uses a 5-lead SOT-23 package (JEDEC MO-178-AA, package option RJ-5), measuring 2.90 mm × 1.60 mm × 1.15 mm with 0.95 mm lead pitch. Outline dimensions are documented in Figure 21 on Page 11 of the datasheet.

Can the ADM823MYRJZ-R7 operate reliably at VCC = 1 V?

Yes, the ADM823MYRJZ-R7 guarantees valid RESET output down to VCC = 1 V, as explicitly stated in the Features list and confirmed in the RESET Output section (Page 9). This ensures deterministic behavior during deep brownout or controlled power-down sequences.

Is the ADM823MYRJZ-R7 RoHS compliant?

Yes, the "Z" suffix in ADM823MYRJZ-R7 indicates RoHS compliance per the Ordering Guide (Page 11), and the part is marked as "RoHS Compliant Part" in the footer of the datasheet.