Analog Devices Inc. ADM6316CY46ARJZ-R7

Overview

ADM6316CY46ARJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, designed for microprocessor supply voltage monitoring and code execution integrity assurance. It features a 4.63 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, push-pull active-low RESET output, and consumes ≤12 µA at 3.6 V. It is deployed in industrial controllers where reliable brownout detection and watchdog recovery are critical.

For engineers reviewing the ADM6316CY46ARJZ-R7 datasheet, ADM6316CY46ARJZ-R7 pinout, ADM6316CY46ARJZ-R7 application, or ADM6316CY46ARJZ-R7 equivalent, key selection considerations include its precise 4.63 V reset threshold tolerance, guaranteed reset validity down to VCC = 1 V, glitch-immune MR input with 52 kΩ internal pull-up, and compatibility with 5-lead SOT-23 PCB footprints requiring no layout revision.

Technical Context

The ADM6316CY46ARJZ-R7 implements a precision bandgap-based voltage reference for reset threshold generation, with 40 ppm/°C temperature coefficient and 3 mV hysteresis. Its watchdog timer clears on any WDI logic transition (≥50 ns pulse width) and asserts reset if unattended for 1.6 s (typical), with timeout stability across temperature validated per Figure 13.

Reset assertion occurs when VCC falls below 4.63 V (min 4.514 V at −40°C), when MR is pulled low ≥1 µs, or when WDI remains static beyond watchdog timeout. The push-pull RESET output drives low to ≤0.3 V (at ISINK = 1.2 mA, VCC ≥ 2.7 V) and high to ≥0.8 × VCC (at ISOURCE = 500 µA, VCC ≥ 2.7 V), ensuring valid logic levels down to VCC = 1 V.

Key Specifications

Pinout & Package

ADM6316CY46ARJZ-R7 is housed in a 5-lead SOT-23 package (JEDEC MO-178-AA compliant), measuring 2.90 mm × 1.60 mm × 1.15 mm, with gull-wing leads and 0.95 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316HUT46+T and TPS3808G33DBVR, ADM6316CY46ARJZ-R7 uniquely combines 4.63 V precision threshold, integrated 1.6 s watchdog, manual reset with internal pull-up, and push-pull output - delivering full supervision capability in a single 5-pin SOT-23 without external components.

Availability

ADM6316CY46ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automated test equipment requiring stable component supply and long-term lifecycle support.

Supply support for ADM6316CY46ARJZ-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.

The ADM6316 family is part of Analog Devices' precision supervisory IC portfolio, engineered for robust power monitoring and watchdog recovery in harsh industrial and medical environments.

FAQ

What is the exact reset threshold voltage of ADM6316CY46ARJZ-R7 and how does it vary with temperature?

The ADM6316CY46ARJZ-R7 has a nominal reset threshold of 4.63 V, specified as 4.514 V (min) to 4.746 V (max) over the full industrial temperature range of −40°C to +85°C. This ±2.5% tolerance ensures reliable detection of 5 V rail collapse while accommodating manufacturing variation and thermal drift. The device exhibits a temperature coefficient of 40 ppm/°C, meaning threshold shift is predictable and bounded within datasheet limits.

Does ADM6316CY46ARJZ-R7 require an external pull-up resistor on the RESET pin?

No, ADM6316CY46ARJZ-R7 does not require an external pull-up resistor on the RESET pin because it features a push-pull active-low output stage. The internal driver actively pulls RESET low during assertion and drives it high (to ≥0.8 × VCC) during deassertion. This eliminates external components, reduces board area, and improves rise/fall time control compared to open-drain alternatives.

How is the watchdog timeout configured on ADM6316CY46ARJZ-R7, and what is its typical value?

The watchdog timeout on ADM6316CY46ARJZ-R7 is factory-configured and cannot be adjusted externally. For this specific variant, the typical watchdog timeout is 1.6 seconds, with a minimum of 1.12 s and maximum of 2.24 s over temperature. The timer resets on any logic transition (low-to-high or high-to-low) at the WDI pin and asserts RESET if no transition occurs within that period.

What is the function of the MR pin on ADM6316CY46ARJZ-R7, and does it need an external pull-up?

The MR (Manual Reset) pin on ADM6316CY46ARJZ-R7 is an active-low input that triggers a reset when pulled low for ≥1 µs. It includes a 52 kΩ internal pull-up resistor, so no external pull-up is required. This allows direct connection of a push-button switch between MR and ground, simplifying front-panel reset implementation while maintaining noise immunity via integrated debounce.

Can ADM6316CY46ARJZ-R7 operate reliably when the supply voltage drops below 2 V?

Yes, ADM6316CY46ARJZ-R7 guarantees valid RESET output operation down to VCC = 1 V. Both the active-low RESET output and internal supervision circuitry remain functional in this range: RESET is asserted when VCC falls below 4.63 V and remains asserted until VCC rises above threshold and holds for ≥140 ms - all while maintaining logic-level compliance (≤0.3 V low, ≥0.8 × VCC high) even at VCC = 1 V.