Analog Devices Inc. ADM6320CY46ARJ-RL7

Overview

ADM6320CY46ARJ-RL7 from Analog Devices is a supervisory circuit with watchdog timer and manual reset, 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. It is used in microprocessor-based systems requiring reliable power-on reset and code execution monitoring.

For engineers reviewing the ADM6320CY46ARJ-RL7 datasheet, ADM6320CY46ARJ-RL7 pinout, ADM6320CY46ARJ-RL7 application, or ADM6320CY46ARJ-RL7 equivalent, key selection criteria include its open-drain reset output compatibility with mixed-voltage logic, guaranteed reset validity down to VCC = 1 V, industrial temperature range, and precise 4.63 V threshold for 5 V rail supervision.

Technical Context

The ADM6320CY46ARJ-RL7 integrates a precision voltage reference, reset generator with hysteresis (3 mV), and watchdog detector with glitch-immune WDI input. Its reset assertion occurs when VCC falls below 4.63 V ±2.5% across −40°C to +85°C, with propagation delay <40 µs during VCC fall and <230 ns from MR deassertion to RESET deassertion.

Watchdog functionality clears on any WDI logic transition (min pulse width 50 ns) and times out after 1.6 s (typical); timeout is disabled if WDI floats. Manual reset (MR) is active-low with internal 52 kΩ pull-up and 100 ns glitch rejection, asserting RESET for full 140 ms minimum timeout period.

Key Specifications

Pinout & Package

ADM6320CY46ARJ-RL7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 1.9 mm × 2.9 mm footprint and 1.3 mm height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6320XR46D3+T and TPS3808G33DBVR, ADM6320CY46ARJ-RL7 uniquely combines 4.63 V precision threshold, integrated MR pull-up, and 1.6 s watchdog in an open-drain SOT-23 package-making it optimal for robust 5 V microprocessor supervision where runtime fault detection is required.

Availability

ADM6320CY46ARJ-RL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body electronics, smart energy meters, and portable instrumentation requiring stable component supply with guaranteed long-term availability.

Supply support for ADM6320CY46ARJ-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 system supervision-delivering precision voltage monitoring, configurable reset timing, and watchdog-based firmware integrity assurance in space-constrained applications.

FAQ

What is the exact reset threshold voltage of ADM6320CY46ARJ-RL7 and how does it vary with temperature?

The ADM6320CY46ARJ-RL7 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 ±0.0185 V across the range - verified in Table 5 and Figure 9 of the Rev. I datasheet. This ensures consistent 5 V rail supervision without false triggers during thermal cycling.

Does ADM6320CY46ARJ-RL7 require an external pull-up resistor on the RESET pin, and what value is recommended?

Yes, ADM6320CY46ARJ-RL7 features an open-drain RESET output and requires an external pull-up resistor. A 10 kΩ resistor to the target logic rail (e.g., 3.3 V or 5 V) is recommended per the datasheet (Figure 19 and "Open-Drain RESET Output" section), balancing fast rise time, low power, and compatibility with MCU input thresholds. Values between 4.7 kΩ and 100 kΩ are acceptable depending on bus capacitance and drive strength needs.

Can the watchdog timer in ADM6320CY46ARJ-RL7 be disabled, and if so, how?

Yes, the watchdog timer in ADM6320CY46ARJ-RL7 is disabled by leaving the WDI pin unconnected (floating), as stated in the "Watchdog Input" section (Page 6) and "Circuit Description" (Page 9). No configuration register or external signal is needed - the internal window comparator disconnects the watchdog from reset generation when WDI is floating, allowing use of the part solely as a voltage supervisor.

What is the minimum pulse width required on the MR pin to assert reset in ADM6320CY46ARJ-RL7?

The ADM6320CY46ARJ-RL7 requires a minimum MR pulse width of 1 µs to reliably assert reset, as specified in Table 2 ("Manual Reset Input") and confirmed in Figure 15. The internal debounce circuit rejects glitches shorter than 100 ns, ensuring noise immunity while maintaining responsiveness to intentional manual reset events generated by push-button switches.

Is ADM6320CY46ARJ-RL7 RoHS compliant and what is its packaging format?

Yes, ADM6320CY46ARJ-RL7 is RoHS compliant (denoted by "Z" suffix in ordering code per Figure 22) and supplied in a 3,000-piece tape-and-reel format (RL7 designation). The package is a 5-lead SOT-23 (RJ-5) per JEDEC MO-178-AA, with lead finish matte tin and halogen-free molding compound - fully documented in the Ordering Guide (Page 13) and Outline Dimensions (Page 13).