Analog Devices Inc. ADM6320CY46ARJZ-R7

Overview

ADM6320CY46ARJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, configured for 4.63 V reset threshold, 140 ms minimum reset timeout, and 1.6 s typical watchdog timeout. It features open-drain active-low RESET output, operates from 1 V to 5.5 V supply, consumes ≤12 µA at 3.6 V, and is specified over −40°C to +85°C for microprocessor power monitoring in industrial embedded systems.

For engineers reviewing the ADM6320CY46ARJZ-R7 datasheet, ADM6320CY46ARJZ-R7 pinout, ADM6320CY46ARJZ-R7 application, or ADM6320CY46ARJZ-R7 equivalent, key selection criteria include its open-drain reset stage, 4.63 V precision threshold with ±2.5% tolerance over temperature, 140 ms reset hold time, watchdog sensitivity to 50 ns pulses, and compatibility with brownout recovery in portable controllers and intelligent instrumentation.

Technical Context

The ADM6320CY46ARJZ-R7 implements a voltage-monitoring architecture with internal bandgap reference and comparator-based reset generation, guaranteeing valid RESET assertion down to VCC = 1 V. Its watchdog detector clears on any WDI logic transition (low-to-high or high-to-low), with timeout options selected via part number suffix (Y = 1.6 s typical).

It integrates MR debounce and glitch rejection (100 ns noise immunity), supports external pull-up for open-drain RESET, and features internal 52 kΩ MR pull-up. The device uses a 5-lead SOT-23 package with pin 1 = RESET (open-drain), pin 2 = GND, pin 3 = MR, pin 4 = WDI, pin 5 = VCC - matching the ADM6316/ADM6320 functional configuration.

Key Specifications

Pinout & Package

ADM6320CY46ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 1.3 mm max height, 2.9 mm × 1.6 mm footprint, and gull-wing leads.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6326UT46D3+T and TPS3808G33DBVR, ADM6320CY46ARJZ-R7 uniquely combines 4.63 V precision threshold, 140 ms reset hold, open-drain output, integrated manual reset, and 1.6 s watchdog - enabling single-chip supervision for complex embedded systems without external components or firmware workarounds.

Availability

ADM6320CY46ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automated test equipment requiring stable component supply with guaranteed long-term availability.

Supply support for ADM6320CY46ARJZ-R7 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 and manufacturing expertise spanning precision sensing, power management, and reliability-critical ICs.

The ADM63xx family was designed specifically for robust microprocessor supervision in harsh environments - delivering guaranteed reset validity down to 1 V, glitch-immune monitoring, and configurable watchdog timing for industrial, medical, and instrumentation applications.

FAQ

What is the exact reset threshold voltage of ADM6320CY46ARJZ-R7 and how does it vary with temperature?

The ADM6320CY46ARJZ-R7 has a nominal reset threshold of 4.63 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 maximum deviation of approximately ±11.6 mV across the range - verified in Figure 9 of the Rev. I datasheet. This ensures stable brownout detection in thermally variable deployments.

Does ADM6320CY46ARJZ-R7 require an external pull-up resistor on the RESET pin, and what value is recommended?

Yes, ADM6320CY46ARJZ-R7 requires an external pull-up resistor on the RESET pin because it features an open-drain output stage. A 10 kΩ resistor to the target logic rail (≤6 V) is recommended per the datasheet's Figure 19 guidance and typical application circuits. This value ensures proper logic-high level under load while minimizing current draw during reset assertion.

Can the watchdog timer in ADM6320CY46ARJZ-R7 be disabled, and if so, how?

Yes, the watchdog timer in ADM6320CY46ARJZ-R7 can be disabled by leaving the WDI pin unconnected (floating). As stated in the "Watchdog Input" section (page 9), an internal window comparator disconnects the watchdog timer from the reset circuitry when WDI is floating, preventing timeout-induced resets. No configuration register or external signal is needed.

What is the minimum pulse width required on the MR pin of ADM6320CY46ARJZ-R7 to trigger a reset?

The MR pin of ADM6320CY46ARJZ-R7 requires a minimum low pulse width of 1 µs to assert reset, as specified in Table 2 (page 4) and confirmed in Figure 15. The device includes on-chip debounce and rejects glitches shorter than 100 ns, ensuring immunity to mechanical switch bounce or electrical noise without external RC filtering.

Is ADM6320CY46ARJZ-R7 compatible with 3.3 V microcontrollers, and how does it behave when VCC drops below 1 V?

Yes, ADM6320CY46ARJZ-R7 is compatible with 3.3 V microcontrollers: its RESET output is open-drain and can be pulled up to 3.3 V, and MR/WDI inputs accept 0.3×VCC to 0.7×VCC logic thresholds. However, RESET assertion is guaranteed only down to VCC = 1 V - below that, output state is undefined per Absolute Maximum Ratings (Table 3), so system-level brownout protection must be designed accordingly.