Analog Devices Inc. ADM8616VCYAKSZ-RL7

Overview

ADM8616VCYAKSZ-RL7 from Analog Devices is a low-voltage supervisory circuit with integrated watchdog timer in 4-lead SC70 package, designed to monitor VCC supply voltage and ensure microprocessor code integrity. It features a 2.32 V reset threshold, 140 ms reset timeout, 1.6 s watchdog timeout, push-pull active-low RESET output, and guaranteed operation down to VCC = 1 V - used in portable microcontroller systems requiring brownout protection and fail-safe restart.

For engineers reviewing the ADM8616VCYAKSZ-RL7 datasheet, ADM8616VCYAKSZ-RL7 pinout, ADM8616VCYAKSZ-RL7 application, or ADM8616VCYAKSZ-RL7 equivalent, key selection criteria include reset threshold accuracy (±13 mV at 2.32 V), watchdog timeout stability over temperature (±15% max deviation), push-pull drive capability (VOH ≥ 0.8×VCC at ISOURCE = 500 µA), and glitch-immune VCC transient rejection (e.g., 100 mV/8 µs rejection for 2.93 V parts).

Technical Context

The ADM8616VCYAKSZ-RL7 implements a precision bandgap-based voltage reference (40 ppm/°C tempco) feeding a comparator that triggers RESET when VCC falls below 2.32 V. Its internal watchdog timer clears on any WDI logic transition (min pulse width 50 ns) and asserts RESET if no transition occurs within 1.6 s.

RESET assertion is synchronized to VCC crossing the threshold with 40 µs delay (VCC falling at 1 mV/µs), and remains active for 140 ms after VCC recovers. The push-pull output drives high (VOH ≥ 2.16 V at VCC = 2.7 V) and low (VOL ≤ 0.3 V at ISINK = 1.2 mA), enabling direct interface to 1.8 V–5 V logic without pull-up resistors.

Key Specifications

Pinout & Package

ADM8616VCYAKSZ-RL7 is housed in a 4-lead SC70 (KS-4) package measuring 2.20 mm × 1.35 mm × 0.90 mm, with 0.65 mm lead pitch and RoHS-compliant matte tin finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT23D3+T and TPS3808G125DBVR, ADM8616VCYAKSZ-RL7 uniquely combines 2.32 V precision threshold, integrated 1.6 s watchdog, and 5 µA quiescent current in SC70 - making it optimal for space- and power-constrained industrial microcontrollers where both voltage monitoring and code execution integrity are required.

Availability

ADM8616VCYAKSZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical patient monitors, and smart energy meters requiring stable component supply with guaranteed long-term availability and RoHS compliance.

Supply support for ADM8616VCYAKSZ-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, with design centers worldwide and ISO 9001-certified manufacturing.

The ADM8616/ADM8617 family was engineered specifically for microprocessor-based systems needing reliable power-on reset, brownout protection, and hardware-enforced firmware watchdog coverage - targeting portable, industrial, and medical embedded applications.

FAQ

What is the exact reset threshold voltage of ADM8616VCYAKSZ-RL7?

The ADM8616VCYAKSZ-RL7 has a nominal reset threshold of 2.32 V, with a typical tolerance of ±13 mV (2.307 V to 2.333 V) over −40°C to +85°C, as specified in Table 1 of the Rev. C datasheet under the "ADM861xZ" threshold grade. This value is laser-trimmed during production and exhibits 40 ppm/°C temperature coefficient.

Does ADM8616VCYAKSZ-RL7 support watchdog functionality, and what is its timeout period?

Yes, ADM8616VCYAKSZ-RL7 includes an integrated watchdog timer with a typical timeout period of 1.6 seconds, corresponding to the "Y" suffix in its ordering code. The watchdog clears on any logic transition (low-to-high or high-to-low) at the WDI pin and asserts RESET if no transition occurs within this period - verified in Figure 6 and Table 1 of the datasheet.

What type of RESET output does ADM8616VCYAKSZ-RL7 feature, and how does it differ from ADM8617 variants?

ADM8616VCYAKSZ-RL7 features a push-pull active-low RESET output, capable of both sourcing and sinking current - unlike the open-drain RESET of ADM8617 variants. This eliminates the need for an external pull-up resistor and allows direct interfacing with 1.8 V–5 V logic families, as confirmed in the Functional Block Diagram and Pin Function Descriptions sections.

Can ADM8616VCYAKSZ-RL7 operate reliably at VCC below 1.5 V?

Yes, ADM8616VCYAKSZ-RL7 guarantees valid RESET output behavior down to VCC = 1 V, including VOL ≤ 0.3 V at ISINK = 1.2 mA and VOH ≥ 0.8×VCC at ISOURCE = 500 µA. Its internal circuitry remains functional across the full 1 V to 5.5 V operating range, as stated in the Absolute Maximum Ratings and RESET Output specifications.

What package and footprint does ADM8616VCYAKSZ-RL7 use, and is it compatible with standard reflow profiles?

ADM8616VCYAKSZ-RL7 uses the 4-lead SC70 (KS-4) package per EIAJ SC82, with dimensions 2.20 mm × 1.35 mm × 0.90 mm and 0.65 mm lead pitch. It is RoHS-compliant (Z suffix) and qualified for Pb-free reflow up to 260°C for 40 seconds, as documented in the Absolute Maximum Ratings table and Outline Dimensions section.