Analog Devices Inc. ADM8616WCYAKSZ-RL7

Overview

ADM8616WCYAKSZ-RL7 from Analog Devices is a low-voltage supervisory circuit with integrated watchdog timer, designed to monitor VCC supply integrity and microprocessor code execution in embedded systems. It features a 1.67 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 - enabling reliable reset assertion in battery-powered portable equipment.

For engineers reviewing the ADM8616WCYAKSZ-RL7 datasheet, ADM8616WCYAKSZ-RL7 pinout, ADM8616WCYAKSZ-RL7 application, or ADM8616WCYAKSZ-RL7 equivalent, key selection criteria include precise low-threshold voltage monitoring (1.67 V), guaranteed RESET validity at ultra-low VCC, glitch-immune timing behavior, and SC70 package compatibility for space-constrained PCB layouts.

Technical Context

The ADM8616WCYAKSZ-RL7 implements a precision bandgap-based voltage reference with 40 ppm/°C temperature coefficient and 2×VTH hysteresis to ensure stable reset assertion during brownout recovery. Its watchdog detector clears on any WDI logic transition (≥50 ns pulse width), supporting robust software-strobe schemes without requiring dedicated timer peripherals.

RESET generation is dual-triggered: by VCC falling below 1.67 V (with 40 µs delay at 1 mV/µs slew) or by WDI inactivity exceeding 1.6 s. The push-pull output drives low to ≤0.3 V at 1.2 mA (VCC ≥ 2.7 V), eliminating external pull-up components required by open-drain alternatives.

Key Specifications

Pinout & Package

ADM8616WCYAKSZ-RL7 is housed in a RoHS-compliant 4-lead SC70 (KS-4) package (2.20 mm × 1.35 mm × 0.9 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 MAX6326UT29D3+T and TPS3808G125DBVR, the ADM8616WCYAKSZ-RL7 delivers fixed 1.67 V supervision with factory-trimmed 1.6 s watchdog - eliminating calibration overhead and external components while maintaining SC70 size and sub-µA quiescent current.

Availability

ADM8616WCYAKSZ-RL7 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, smart home hub controllers, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for ADM8616WCYAKSZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADM8616/ADM8617 family was engineered specifically for low-power, space-constrained microprocessor supervision - delivering precision voltage monitoring, glitch-immune timing, and integrated watchdog functionality in minimal SC70 packaging.

FAQ

What is the exact reset threshold voltage of the ADM8616WCYAKSZ-RL7?

The ADM8616WCYAKSZ-RL7 has a factory-trimmed reset threshold of 1.67 V, with a typical tolerance of ±0.05 V over −40°C to +85°C. This value is confirmed in Table 1 of the Rev. C datasheet under the "ADM861xW" row, and corresponds to the "W" suffix in the ordering code. The device guarantees valid RESET assertion down to VCC = 1 V, making it suitable for brownout detection in 1.8 V systems.

Does the ADM8616WCYAKSZ-RL7 require an external pull-up resistor on the RESET pin?

No, the ADM8616WCYAKSZ-RL7 does not require an external pull-up resistor because it features a push-pull active-low RESET output. Unlike open-drain variants (e.g., ADM8617), this configuration actively drives both logic high and logic low states. The datasheet specifies VOH ≥ 0.8 × VCC (at ISOURCE = 500 µA) and VOL ≤ 0.3 V (at ISINK = 1.2 mA), confirming full drive capability without external components.

How is the watchdog timeout configured on the ADM8616WCYAKSZ-RL7?

The watchdog timeout on the ADM8616WCYAKSZ-RL7 is factory-set to 1.6 s (typical), corresponding to the "Y" suffix in the ordering code per Figure 17. It cannot be adjusted externally - the timeout is implemented with an internal RC oscillator and is specified with ±50% variation (1.12 s to 2.4 s min/max). The timer resets on any WDI logic transition (≥50 ns), and is disabled if WDI is left floating.

Can the ADM8616WCYAKSZ-RL7 operate with a supply voltage below 1.8 V?

Yes, the ADM8616WCYAKSZ-RL7 operates from VCC = 1 V to 5.5 V and guarantees valid RESET output down to VCC = 1 V. Its internal circuitry remains functional at 1.5 V (typical supply current = 4.5 µA), enabling use in ultra-low-voltage applications such as energy-harvesting nodes or backup-supply monitoring. The 1.67 V reset threshold ensures reliable triggering even with significant supply droop.

What package type and marking code does the ADM8616WCYAKSZ-RL7 use?

The ADM8616WCYAKSZ-RL7 uses a 4-lead SC70 package (Analog Devices package code KS-4), with dimensions 2.20 mm × 1.35 mm × 0.9 mm. Its top-side marking code is "N0F", as listed in the Ordering Guide for all ADM8616x CYAKSZ-RL7 variants. The "Z" suffix confirms RoHS compliance, and "RL7" denotes a 3,000-piece tape-and-reel shipment.