Analog Devices Inc. ADM8617YAYAKSZ-RL7

Overview

ADM8617YAYAKSZ-RL7 from Analog Devices is a low-voltage supervisory circuit with integrated watchdog timer, designed for microprocessor reset management in brownout and code-failure conditions. It features a 2.19 V reset threshold, 1 ms reset timeout, 1.6 s watchdog timeout, open-drain active-low RESET output, and operates from 1 V to 5.5 V supply with 5 µA typical quiescent current.

For engineers reviewing the ADM8617YAYAKSZ-RL7 datasheet, ADM8617YAYAKSZ-RL7 pinout, ADM8617YAYAKSZ-RL7 application, or ADM8617YAYAKSZ-RL7 equivalent, key selection criteria include reset threshold accuracy (±1.5% over temperature), guaranteed RESET validity down to VCC = 1 V, glitch-immune transient rejection, and compatibility with low-power portable systems requiring reliable power-on and watchdog reset sequencing.

Technical Context

The ADM8617YAYAKSZ-RL7 implements dual supervision: precise voltage monitoring via an internal bandgap reference and code integrity checking via a transition-triggered watchdog timer. Its reset generator asserts active-low RESET when VCC falls below 2.19 V or when WDI remains static beyond 1.6 s, with a fixed 1 ms deassertion delay after recovery.

Unlike push-pull variants, this part uses an open-drain RESET output enabling wired-OR configuration and flexible pull-up voltage selection. The watchdog input accepts ≥50 ns pulses and clears on any logic transition-low-to-high or high-to-low-ensuring robust detection of stalled firmware execution without requiring dedicated clock sources.

Key Specifications

Pinout & Package

ADM8617YAYAKSZ-RL7 is housed in a 4-lead SC70 (KS-4) package measuring 2.20 mm × 1.35 mm × 0.95 mm, optimized for space-constrained PCB layouts and reflow-compatible with standard SMT processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT23D3+T and TPS3808G125DBVR, the ADM8617YAYAKSZ-RL7 uniquely combines 2.19 V precision threshold, 1.6 s watchdog, open-drain output, and 5 µA operation in SC70 - making it optimal for compact, low-power microprocessor systems requiring both voltage and code integrity supervision.

Availability

ADM8617YAYAKSZ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.

Supply support for ADM8617YAYAKSZ-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 product line delivers precision voltage supervision and watchdog functionality for microprocessor-based systems where reliability during power transitions and firmware faults is critical.

FAQ

What is the exact reset threshold voltage of the ADM8617YAYAKSZ-RL7?

The ADM8617YAYAKSZ-RL7 has a nominal reset threshold of 2.19 V, with a guaranteed tolerance of ±1.5% over the full −40°C to +85°C temperature range. This value is laser-trimmed during production and specified in Table 1 of the Rev. C datasheet under the "ADM861xY" designation. The part maintains this accuracy without external components.

Does the ADM8617YAYAKSZ-RL7 require an external pull-up resistor on the RESET pin?

Yes, the ADM8617YAYAKSZ-RL7 features an open-drain RESET output and requires an external pull-up resistor to the target system's logic supply (e.g., 3.3 V or 1.8 V). Typical values range from 10 kΩ to 100 kΩ depending on bus capacitance and rise-time requirements. No pull-up is needed if RESET connects to a microcontroller input with internal weak pull-up enabled.

Can the watchdog timer in the ADM8617YAYAKSZ-RL7 be disabled without modifying the PCB?

Yes, the watchdog timer in the ADM8617YAYAKSZ-RL7 is automatically disabled when the WDI pin is left unconnected (floating). Internal window comparator circuitry isolates the watchdog from the RESET generator, ensuring no unintended resets occur. This provides field-serviceable disable capability without soldering or jumper changes.

What is the minimum VCC voltage at which the ADM8617YAYAKSZ-RL7 guarantees valid RESET output?

The ADM8617YAYAKSZ-RL7 guarantees valid active-low RESET output down to VCC = 1 V, as confirmed in the "RESET Output Voltage" section of the datasheet (VOL ≤ 0.3 V at ISINK = 50 µA). This ensures deterministic reset behavior during deep brownout events common in battery-backed systems.

How does the ADM8617YAYAKSZ-RL7 handle fast power supply transients?

The ADM8617YAYAKSZ-RL7 incorporates built-in glitch rejection that ignores transients ≤8 µs duration when magnitude is ≤100 mV below the 2.19 V threshold. This is verified in Figure 8 of the datasheet. Adding a 0.1 µF ceramic capacitor close to the VCC pin further enhances immunity to high-frequency noise from switching regulators.