Analog Devices Inc. ADM6320CY29ARJ-RL7

Overview

ADM6320CY29ARJ-RL7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, configured for open-drain active-low RESET output. It monitors VCC supply voltage at 2.93 V threshold, provides 140 ms minimum reset timeout and 1.6 s typical watchdog timeout, and operates across −40°C to +85°C in 5-lead SOT-23. It ensures reliable microprocessor reset during power-up, brownout, or code lockup in portable controllers.

For engineers reviewing the ADM6320CY29ARJ-RL7 datasheet, ADM6320CY29ARJ-RL7 pinout, ADM6320CY29ARJ-RL7 application, or ADM6320CY29ARJ-RL7 equivalent, key selection considerations include its open-drain RESET output requiring external pull-up, 2.93 V reset threshold tolerance (±2.5% over temperature), 140 ms reset assertion duration, 1.6 s watchdog timeout, and compatibility with low-power microcontroller systems needing manual reset capability and glitch-immune supervision.

Technical Context

The ADM6320CY29ARJ-RL7 implements a precision bandgap-based voltage reference for reset threshold detection and a digital watchdog timer cleared by logic transitions on WDI. Its internal debounce and 100 ns MR glitch rejection ensure noise immunity. The open-drain RESET output supports flexible voltage rail interfacing up to 6 V via external pull-up.

It integrates three independent supervision functions: undervoltage detection (2.93 V ±2.5%), timed reset assertion (140 ms min), and watchdog timeout monitoring (1.6 s typ). All functions assert the same open-drain RESET signal, which remains valid down to VCC = 1 V and features guaranteed logic-low sink capability at 1.2 mA.

Key Specifications

Pinout & Package

ADM6320CY29ARJ-RL7 is housed in a 5-lead SOT-23 package (JEDEC MO-178-AA compliant) with 0.95 mm lead pitch and 2.8–3.0 mm body length. Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC (monitored supply), and Pin 5 is WDI (watchdog input).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320XR29D3+T and TPS3808G33DBVR, ADM6320CY29ARJ-RL7 uniquely combines open-drain RESET, manual reset input, and programmable watchdog in one 5-pin SOT-23 - enabling compact, feature-complete supervision where both hardware-initiated and software-monitored reset paths are essential.

Availability

ADM6320CY29ARJ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive body control modules, and IoT edge sensor nodes requiring stable component supply and long-term lifecycle support.

Supply support for ADM6320CY29ARJ-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 ADM63xx family was designed specifically for microprocessor-based systems requiring robust, low-power supply supervision with integrated watchdog and manual reset - targeting industrial, medical, and automotive applications demanding high reliability and wide temperature operation.

FAQ

What is the exact reset threshold voltage of ADM6320CY29ARJ-RL7 and how does it vary with temperature?

The ADM6320CY29ARJ-RL7 has a nominal reset threshold of 2.93 V at +25°C, with tolerance of ±2.5% over the full industrial temperature range (−40°C to +85°C). Its temperature coefficient is 40 ppm/°C, resulting in a maximum deviation of approximately ±11.7 mV across the operating range - verified in Table 5 and Figure 9 of the Rev. I datasheet.

Does ADM6320CY29ARJ-RL7 require an external pull-up resistor on the RESET pin, and what value is recommended?

Yes, ADM6320CY29ARJ-RL7 features an open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the target logic rail (≤6 V) is recommended per the datasheet (Figure 19 and "Open-Drain RESET Output" section), balancing leakage current, rise time, and noise immunity for most microcontroller reset inputs.

What is the watchdog timeout behavior of ADM6320CY29ARJ-RL7, and how is it cleared?

The ADM6320CY29ARJ-RL7 provides a typical watchdog timeout of 1.6 s (Y-suffix). It is cleared by any logic transition (low-to-high or high-to-low) on the WDI pin, with minimum pulse width of 50 ns. The timer also resets automatically upon assertion of RESET due to VCC undervoltage or MR activation, as documented in the "Watchdog Input" section.

Can ADM6320CY29ARJ-RL7 operate reliably when VCC drops below 2.0 V, and what is the lowest valid VCC for RESET assertion?

Yes - ADM6320CY29ARJ-RL7 guarantees valid RESET output down to VCC = 1 V, as explicitly stated in the "General Description" and "Specifications" sections. This ensures fail-safe reset assertion during deep brownout events, critical for systems powered by depleting batteries or unstable supplies.

How is the manual reset (MR) input debounced and protected against noise in ADM6320CY29ARJ-RL7?

The MR input of ADM6320CY29ARJ-RL7 includes on-chip debounce circuitry and rejects fast transients ≤100 ns (typical), as confirmed in Table 2 ("MR Glitch Rejection") and the "Manual Reset Input" section. It also features a 52 kΩ internal pull-up resistor, eliminating the need for external components while ensuring defined logic-high state when unconnected.