Analog Devices Inc. ADM824SYRJZ-REEL7

Overview

ADM824SYRJZ-REEL7 from Analog Devices is a supervisory circuit with integrated watchdog timer and dual push-pull reset outputs (active-low RESET and active-high RESET), designed for power supply monitoring and code execution integrity in microprocessor systems. It features a 2.93 V reset threshold, 140 ms minimum reset timeout, 1.6 sec typical watchdog timeout, and operates across −40°C to +125°C. Used in automotive-grade embedded controllers requiring reliable brownout detection and fail-safe restart.

For engineers reviewing the ADM824SYRJZ-REEL7 datasheet, ADM824SYRJZ-REEL7 pinout, ADM824SYRJZ-REEL7 application, or ADM824SYRJZ-REEL7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), guaranteed reset validity down to VCC = 1 V, watchdog input pulse width tolerance (50 ns), SC70/SOT-23 package compatibility, and automotive temperature qualification.

Technical Context

The ADM824SYRJZ-REEL7 implements a precision voltage monitor with internal bandgap reference and hysteresis (5 mV), coupled to a monostable watchdog timer cleared by logic transitions on WDI. Its dual push-pull outputs drive both active-low and active-high reset lines simultaneously without external components.

Reset assertion occurs when VCC falls below 2.93 V (typ), MR is not present (ADM824 excludes manual reset), or WDI remains static beyond 1.6 sec. The device guarantees valid output states for VCC ≥ 1 V and consumes only 5 µA (typ) at VCC = 2.85–3.00 V, enabling use in battery-backed systems.

Key Specifications

Pinout & Package

ADM824SYRJZ-REEL7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm pitch, 2.90 mm × 1.60 mm body, and 1.10 mm max height. Pin 1 is RESET (active-low), Pin 2 is GND, Pin 3 is RESET (active-high), Pin 4 is VCC, and Pin 5 is WDI (watchdog input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM824SYRJZ-REEL7, MAX6326UT29D3+T omits watchdog protection-critical for autonomous systems-while TPS3808G33DBVR requires additional passives to replicate dual-push-pull behavior, increasing BOM count and layout complexity.

Availability

ADM824SYRJZ-REEL7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLCs, infotainment head units, and medical patient monitors requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM824SYRJZ-REEL7 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 company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.

The ADM824 belongs to Analog Devices' supervisory circuits product line, engineered specifically for automotive and industrial microprocessor systems requiring guaranteed reset behavior, watchdog safety enforcement, and operation across extreme temperature gradients.

FAQ

What is the exact reset threshold voltage of ADM824SYRJZ-REEL7 and how does it vary with temperature?

The ADM824SYRJZ-REEL7 has a nominal reset threshold of 2.93 V at 25°C, specified from 2.85 V (min) to 3.00 V (max) across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤±10 mV drift over the full range-tight enough for 3.0 V rail monitoring without margining overhead. This value is confirmed in Table 2 of the Rev. D datasheet under ADM82xS grade.

Does ADM824SYRJZ-REEL7 include a manual reset input (MR)?

No, ADM824SYRJZ-REEL7 does not include a manual reset input. Per Table 1 and Pin Function Descriptions (Page 6), only ADM823 and ADM825 feature MR; ADM824 substitutes that pin for the second RESET output. Pin 3 is RESET (active-high), not MR. This is a fixed functional distinction across the ADM823/824/825 family.

What is the watchdog timeout period for ADM824SYRJZ-REEL7 and how is it triggered?

The ADM824SYRJZ-REEL7 watchdog timeout is 1.6 sec (typical), with a range of 1.12–2.40 sec over temperature. It is triggered when no logic transition (low-to-high or high-to-low) occurs on the WDI pin for longer than this period. The timer resets on each edge, so firmware must toggle WDI at least once per timeout interval to prevent reset assertion.

Can ADM824SYRJZ-REEL7 operate reliably at VCC = 1.2 V?

Yes, ADM824SYRJZ-REEL7 guarantees valid RESET and RESET output states down to VCC = 1 V, as stated in the General Description (Page 1) and RESET Output section (Page 9). At VCC = 1.2 V, both outputs meet logic-level specifications: RESET sinks ≥50 µA at ≤0.3 V, and RESET sources ≥150 µA at ≥0.8×VCC-ensuring interoperability with 1.2 V I/O domains.

Which package type is used by ADM824SYRJZ-REEL7 and what are its mechanical dimensions?

ADM824SYRJZ-REEL7 uses the 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA. Its body measures 2.90 mm × 1.60 mm × 1.10 mm max height, with 0.95 mm lead pitch and gull-wing leads. This is confirmed in the Ordering Guide (Page 11) and Outline Dimensions (Figure 21).