Analog Devices Inc. ADM6316BX32ARJZ-R7

Overview

ADM6316BX32ARJZ-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 3.2 V reset threshold (±2.5% over −40°C to +85°C), 20 ms minimum reset timeout, 102 ms typical watchdog timeout, push-pull active-low RESET output, and consumes ≤12 µA at 3.6 V - enabling reliable brownout protection in industrial controllers and portable instrumentation.

For engineers reviewing the ADM6316BX32ARJZ-R7 datasheet, ADM6316BX32ARJZ-R7 pinout, ADM6316BX32ARJZ-R7 application, or ADM6316BX32ARJZ-R7 equivalent, key selection criteria include confirmed reset threshold accuracy across temperature, guaranteed RESET validity down to VCC = 1 V, manual reset pulse width tolerance (≥1 µs), watchdog input transition sensitivity (50 ns min), and SOT-23-5 package compatibility with space-constrained PCB layouts.

Technical Context

The ADM6316BX32ARJZ-R7 implements a precision bandgap-based reset threshold detector with 40 ppm/°C temperature coefficient and 3 mV hysteresis, ensuring stable trip points across industrial temperature range. Its watchdog timer clears on any WDI logic transition (low-to-high or high-to-low) and asserts reset if no transition occurs within 102 ms (typical), supporting fail-safe recovery from firmware hangs.

Reset assertion occurs when VCC falls below 3.2 V, when MR is pulled low ≥1 µs, or when WDI remains static beyond watchdog timeout; deassertion follows a fixed 20 ms (min) active period after VCC rises above threshold or MR releases. 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), eliminating external pull-up requirements.

Key Specifications

Pinout & Package

ADM6316BX32ARJZ-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 MAX6326UT32D3+T and TPS3808G33DBVR, ADM6316BX32ARJZ-R7 uniquely integrates watchdog timing, manual reset, and push-pull output in a single SOT-23-5 package - reducing component count and PCB area while enabling both autonomous and operator-initiated recovery in resource-constrained embedded systems.

Availability

ADM6316BX32ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical monitors, smart energy meters, and automated test equipment requiring stable component supply with guaranteed long-term availability.

Supply support for ADM6316BX32ARJZ-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 specifically for robust power-on reset, brownout protection, and watchdog-based firmware recovery in industrial, medical, and instrumentation applications.

FAQ

What is the exact reset threshold voltage of ADM6316BX32ARJZ-R7 and how does it vary with temperature?

The ADM6316BX32ARJZ-R7 has a nominal reset threshold of 3.2 V, specified as 3.2 V ±2.5% over the full industrial temperature range (−40°C to +85°C). Its temperature coefficient is 40 ppm/°C, meaning the threshold drifts no more than ±0.0128 V across an 80°C span - ensuring consistent brownout detection in thermally demanding environments where the ADM6316BX32ARJZ-R7 is deployed.

Does ADM6316BX32ARJZ-R7 require an external pull-up resistor on the RESET pin?

No, ADM6316BX32ARJZ-R7 does not require an external pull-up resistor because it features a push-pull active-low RESET output. The output actively drives low (≤0.3 V at 1.2 mA sink) and high (≥0.8 × VCC at 500 µA source), eliminating reliance on external biasing - a key differentiator from open-drain alternatives and a design advantage reflected in the ADM6316BX32ARJZ-R7's simplified interface requirements.

What is the minimum pulse width required on the MR pin to assert reset in ADM6316BX32ARJZ-R7?

The ADM6316BX32ARJZ-R7 requires a minimum MR input pulse width of 1 µs to reliably trigger a reset event. This specification is guaranteed over the full operating temperature range and accounts for internal debounce circuitry. The MR pin also includes a 52 kΩ internal pull-up resistor, allowing direct connection of a momentary switch to ground without additional components - a feature integral to the ADM6316BX32ARJZ-R7's system-level simplicity.

How does the watchdog timer in ADM6316BX32ARJZ-R7 respond to WDI signal transitions?

The watchdog timer in ADM6316BX32ARJZ-R7 clears on any logic transition - either low-to-high or high-to-low - at the WDI pin, with a minimum detectable pulse width of 50 ns. If no transition occurs within the 102 ms typical timeout period, the device asserts RESET. Transitions during reset assertion do not restart the timer; it only begins counting again after RESET deasserts - a behavior explicitly defined for the ADM6316BX32ARJZ-R7 in its functional description.

Is ADM6316BX32ARJZ-R7 compatible with 1.8 V microcontrollers?

Yes, ADM6316BX32ARJZ-R7 is compatible with 1.8 V microcontrollers: its VCC operating range starts at 1 V, and its push-pull RESET output guarantees valid logic levels down to VCC = 1 V (low ≤0.3 V, high ≥0.8 × VCC). At VCC = 1.8 V, the high-level output exceeds 1.44 V - meeting standard 1.8 V CMOS input thresholds. This interoperability is a documented electrical characteristic of the ADM6316BX32ARJZ-R7, not an inferred capability.