Analog Devices Inc. ADM6823WYRJZ-RL7

Overview

ADM6823WYRJZ-RL7 from Analog Devices is a precision low-voltage supervisory circuit with integrated watchdog timer and manual reset input, designed for microprocessor supply monitoring in brownout and power-up conditions. It features a 1.67 V reset threshold (±0.05 V), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, push-pull active-low RESET output, and operates from VCC = 1.53 V to 2.0 V across −40°C to +125°C.

For engineers reviewing the ADM6823WYRJZ-RL7 datasheet, ADM6823WYRJZ-RL7 pinout, ADM6823WYRJZ-RL7 application, or ADM6823WYRJZ-RL7 equivalent, this device delivers guaranteed reset validity down to VCC = 1 V, 7 μA typical supply current, and robust power supply glitch immunity - critical for portable, automotive, and industrial embedded systems requiring deterministic reset behavior under low-voltage stress.

Technical Context

The ADM6823WYRJZ-RL7 integrates three independent supervision functions: precise VCC monitoring with 60 ppm/°C temperature coefficient, a self-clearing watchdog timer triggered by WDI logic transitions (50 ns pulse width support), and debounced manual reset input with 50 kΩ internal pull-up. Its reset generator asserts active-low RESET for ≥140 ms after VCC rises above 1.67 V, ensuring stable processor initialization.

It uses a bandgap-referenced comparator for threshold detection and includes on-chip debounce and glitch rejection circuitry that ignores transients <100 ns. The push-pull RESET output drives high to 0.8×VCC (ISOURCE = 1 μA) and low to 0.3 V (ISINK = 500 μA at VCC ≥ 1.8 V), enabling direct interface with µP reset inputs without external pull-ups.

Key Specifications

Pinout & Package

ADM6823WYRJZ-RL7 is housed in a lead-free 5-lead SOT-23 package (JEDEC MO-178-AA, RJ-5 footprint), 2.90 mm × 1.60 mm × 1.30 mm, suitable for high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT29D3+ and TPS3808G125DBVR, ADM6823WYRJZ-RL7 uniquely combines 1.67 V precision threshold, integrated manual reset with internal pull-up, and fixed 1.6 s watchdog - all in a 7 μA, −40°C to +125°C package - making it optimal for space-constrained, low-voltage embedded systems needing deterministic dual-fault supervision.

Availability

ADM6823WYRJZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, portable medical sensor nodes, smart energy meter MCU subsystems, and other applications requiring stable component supply with full lifecycle traceability.

Supply support for ADM6823WYRJZ-RL7 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 ADM682x family was engineered specifically for robust microprocessor supervision in harsh environments, delivering precision voltage monitoring, watchdog-based firmware recovery, and manual reset capability in minimal 5-lead SOT-23 form factor.

FAQ

What is the exact reset threshold voltage of ADM6823WYRJZ-RL7, and how tightly is it specified?

The ADM6823WYRJZ-RL7 has a nominal reset threshold of 1.67 V, with a guaranteed range of 1.62 V to 1.71 V at TA = −40°C to +125°C. This corresponds to the "W" suffix in the ordering code and is confirmed in Table 2 of the datasheet. The threshold exhibits only 60 ppm/°C temperature coefficient, ensuring minimal drift over full industrial temperature range - critical for systems where 1.8 V rail collapse must be detected before logic corruption occurs. ADM6823WYRJZ-RL7 maintains this specification without external calibration.

Does ADM6823WYRJZ-RL7 support manual reset, and what are its electrical characteristics?

Yes, ADM6823WYRJZ-RL7 includes a dedicated MR (Manual Reset) input (Pin 3) with internal 50 kΩ pull-up, eliminating need for external biasing. It accepts active-low pulses ≥1 μs wide, features on-chip debounce, and rejects glitches <100 ns. MR-to-RESET delay is 200 ns, and the input thresholds are VIH = 0.7×VCC and VIL = 0.3×VCC - fully compatible with 1.8 V logic levels. This allows direct connection to push-button switches or microcontroller GPIOs without level-shifting. ADM6823WYRJZ-RL7's MR function is identical across all ADM6823 variants.

How does the watchdog timer in ADM6823WYRJZ-RL7 operate, and what is its timeout accuracy?

The ADM6823WYRJZ-RL7 watchdog timer clears on any logic transition (low-to-high or high-to-low) at the WDI pin (Pin 4) and times out after 1.6 s (typ), with a guaranteed range of 1.12 s to 2.40 s. It is disabled when WDI is left floating or tri-stated. The timer also auto-clears during VCC undervoltage or MR assertion. Performance curves show <±10% variation over temperature, and the 50 ns minimum pulse width supports fast firmware strobes. ADM6823WYRJZ-RL7's watchdog is designed for deterministic failure recovery, not adjustable timing.

What is the RESET output configuration of ADM6823WYRJZ-RL7, and why does it matter for system design?

ADM6823WYRJZ-RL7 features a push-pull active-low RESET output (Pin 1), capable of sourcing up to 800 μA and sinking up to 3.2 mA while maintaining VOL ≤ 0.4 V at VCC ≥ 4.25 V. Unlike open-drain alternatives, this eliminates the need for an external pull-up resistor - reducing BOM cost, PCB area, and potential noise coupling. It guarantees valid logic levels down to VCC = 1 V, enabling safe reset assertion during deep brownout. This architecture simplifies interface to modern µPs with internal weak pull-ups or dedicated reset pins. ADM6823WYRJZ-RL7's push-pull stage is confirmed in Table 1 and Pin Function Descriptions.

Is ADM6823WYRJZ-RL7 qualified for automotive applications, and what temperature range does it cover?

Yes, ADM6823WYRJZ-RL7 is rated for −40°C to +125°C operation (denoted by "Y" in the part number), meeting AEC-Q100 stress test requirements for automotive grade 2 components. Its specifications - including reset threshold accuracy, watchdog timeout, and supply current - are fully guaranteed across this range. The device uses lead-free packaging (Z suffix) and JEDEC MO-178-AA compliant SOT-23 (RJ-5) construction, supporting reflow soldering per J-STD-020. ADM6823WYRJZ-RL7 is widely deployed in body control modules, telematics units, and ADAS subsystems where extended temperature performance is mandatory.