Analog Devices Inc. ADM8616LCYAKSZ-RL7

Overview

ADM8616LCYAKSZ-RL7 from Analog Devices is a low-voltage supervisory circuit with integrated watchdog timer, designed to monitor VCC supply integrity and ensure microprocessor reset during power-up, brownout, or code execution failure. It features a 4.63 V reset threshold, 140 ms reset timeout, 1.6 s watchdog timeout, push-pull active-low RESET output, and operates down to VCC = 1 V in microcontroller-based embedded systems.

For engineers reviewing the ADM8616LCYAKSZ-RL7 datasheet, ADM8616LCYAKSZ-RL7 pinout, ADM8616LCYAKSZ-RL7 application, or ADM8616LCYAKSZ-RL7 equivalent, key selection criteria include precise reset voltage accuracy (±130 mV over temperature), guaranteed RESET validity at low VCC, glitch-immune transient rejection, and SC70 package compatibility for space-constrained portable designs.

Technical Context

The ADM8616LCYAKSZ-RL7 implements a precision bandgap reference-based reset comparator with 40 ppm/°C temperature coefficient and 2×VTH hysteresis, ensuring stable threshold behavior across −40°C to +85°C. Its watchdog timer clears on any WDI logic transition (min. 50 ns pulse width) and asserts RESET if unattended for 1.6 s (typical).

RESET generation is dual-triggered: undervoltage on VCC below 4.63 V (with 140 ms timeout after VCC rise) or WDI timeout. The push-pull output drives low to ≤0.3 V at 1.2 mA (VCC ≥ 2.7 V) and high to ≥0.8×VCC, eliminating external pull-up requirements.

Key Specifications

Pinout & Package

ADM8616LCYAKSZ-RL7 is housed in a 4-lead SC70 (KS-4) package measuring 2.20 mm × 1.35 mm × 0.90 mm, optimized for high-density portable PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326US46D3+T and TPS3808G33DBVR, ADM8616LCYAKSZ-RL7 uniquely combines 4.63 V precision reset, integrated 1.6 s watchdog, push-pull output, and 5 µA quiescent current in SC70-making it optimal for compact, self-recovering embedded systems where board space and power budget are constrained.

Availability

ADM8616LCYAKSZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical portable monitors, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for ADM8616LCYAKSZ-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.

The ADM8616/ADM8617 product line delivers precision, low-power supervisory circuits with integrated watchdog timers specifically for microprocessor-based systems demanding reliable power-on reset and runtime fault recovery.

FAQ

What is the exact reset threshold voltage of the ADM8616LCYAKSZ-RL7?

The ADM8616LCYAKSZ-RL7 has a nominal reset threshold of 4.63 V, with a guaranteed range of 4.50 V to 4.75 V over temperature (−40°C to +85°C) and supply voltage. This value is laser-trimmed during production and specified with 40 ppm/°C temperature coefficient, ensuring stability across industrial operating conditions. The ADM8616LCYAKSZ-RL7 uses this precise threshold to hold microprocessors in reset until the monitored VCC rail reaches and sustains its target level.

Does the ADM8616LCYAKSZ-RL7 require an external pull-up resistor on the RESET pin?

No, the ADM8616LCYAKSZ-RL7 does not require an external pull-up resistor because it features a push-pull active-low RESET output stage. This internal driver actively pulls the RESET line low during assertion and drives it high (to ≥0.8×VCC) during deassertion, eliminating dependency on external components. This design reduces BOM cost and PCB area versus open-drain alternatives like the ADM8617, and is confirmed in the Functional Block Diagram and Pin Function Descriptions of the ADM8616LCYAKSZ-RL7 datasheet.

What watchdog timeout period is implemented in the ADM8616LCYAKSZ-RL7?

ADM8616LCYAKSZ-RL7 implements a 1.6 second typical watchdog timeout period, corresponding to the 'Y' suffix in its ordering code. This value is verified in the Ordering Guide (1.6 s) and Typical Performance Characteristics (Figure 6), with min/max bounds of 1.12 s to 2.4 s over temperature. The timer resets on any WDI logic transition (≥50 ns), and its 1.6 s duration balances robust hang detection against false triggering in systems with variable task scheduling-making it especially suitable for firmware with moderate real-time constraints.

Can the ADM8616LCYAKSZ-RL7 operate reliably when VCC drops below 2 V?

Yes, the ADM8616LCYAKSZ-RL7 guarantees functional RESET output behavior down to VCC = 1 V, as explicitly stated in both the General Description and Specifications table. Its push-pull output remains valid (VOL ≤ 0.3 V at ISINK = 1.2 mA when VCC ≥ 2.7 V; VOH ≥ 0.8×VCC when VCC ≥ 2.7 V), and the internal reference and comparators continue operating. This capability allows the ADM8616LCYAKSZ-RL7 to maintain deterministic reset control during deep brownout events common in battery-backed or energy-harvesting systems.

How is the watchdog function disabled on the ADM8616LCYAKSZ-RL7?

The watchdog function in ADM8616LCYAKSZ-RL7 is disabled by leaving the WDI pin (Pin 3) unconnected (floating). According to the datasheet's Circuit Description and Application Information sections, an internal window comparator disconnects the watchdog timer from the RESET output circuitry when WDI is floating, preventing timeout-induced resets. No external components or configuration bits are required-this passive disable method simplifies design and avoids accidental activation during development or test phases.