Analog Devices Inc. ADM6316CW25ARJZ-R7

Overview

ADM6316CW25ARJZ-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 2.5 V reset threshold, 140 ms minimum reset timeout, 6.3 ms typical watchdog timeout, push-pull active-low RESET output, and operates across −40°C to +85°C in a 5-lead SOT-23 package - ideal for industrial embedded controllers requiring reliable brownout and software-fault recovery.

For engineers reviewing the ADM6316CW25ARJZ-R7 datasheet, ADM6316CW25ARJZ-R7 pinout, ADM6316CW25ARJZ-R7 application, or ADM6316CW25ARJZ-R7 equivalent, key selection criteria include reset threshold accuracy (±2.5% over temperature), guaranteed RESET validity down to VCC = 1 V, power supply glitch immunity, low 5 µA quiescent current, and compatibility with manual reset push-button interfaces and microprocessor watchdog strobe timing requirements.

Technical Context

The ADM6316CW25ARJZ-R7 implements a precision bandgap-based voltage reference and comparator to monitor VCC against a factory-trimmed 2.5 V threshold with ±2.5% tolerance over −40°C to +85°C. Its internal watchdog timer clears on any WDI logic transition (min. 50 ns pulse width) and asserts RESET if un-serviced for 6.3 ms (typical), supporting fail-safe recovery from firmware hangs.

Reset assertion occurs on VCC undervoltage, MR low pulse ≥1 µs, or WDI timeout; deassertion follows a fixed 140 ms (min.) active period after recovery. The push-pull RESET output drives low to ≤0.3 V at 1.2 mA sink (VCC ≥ 2.7 V) and high to ≥0.8×VCC at 500 µA source, ensuring robust interfacing with microprocessor reset inputs without external pull-up components.

Key Specifications

Pinout & Package

Package: 5-lead SOT-23 (RJ-5), JEDEC MO-178-AA compliant, footprint-compatible with industry-standard 5-pin SOT-23 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6316US25D3+ and TPS3808G33DBVR, the ADM6316CW25ARJZ-R7 uniquely integrates 2.5 V precision reset, 140 ms timeout, manual reset, and 6.3 ms watchdog in one 5-lead SOT-23 package - delivering complete power and software fault supervision without design compromises.

Availability

ADM6316CW25ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, smart energy meters, and automotive body control modules requiring stable component supply with guaranteed long-term availability.

Supply support for ADM6316CW25ARJZ-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 microprocessor reset and watchdog functionality in harsh industrial and automotive environments.

FAQ

What is the exact reset threshold voltage and tolerance for ADM6316CW25ARJZ-R7?

The ADM6316CW25ARJZ-R7 has a nominal reset threshold of 2.5 V, with ±1.5% tolerance at 25°C and ±2.5% tolerance over the full −40°C to +85°C operating temperature range, as specified in Table 2 of the Rev. I datasheet. This ensures accurate detection of 2.5 V rail collapse before microprocessor functional failure, and the ADM6316CW25ARJZ-R7 maintains this specification without external calibration.

Does ADM6316CW25ARJZ-R7 require an external pull-up resistor on the RESET pin?

No, the ADM6316CW25ARJZ-R7 features a push-pull active-low RESET output, eliminating the need for an external pull-up resistor. Its output actively drives low (≤0.3 V at 1.2 mA sink) and high (≥0.8×VCC at 500 µA source), ensuring valid logic levels across its 1 V to 5.5 V VCC range. This simplifies design and reduces BOM count compared to open-drain alternatives like ADM6320, and the ADM6316CW25ARJZ-R7 delivers this capability in the same 5-lead SOT-23 footprint.

What is the watchdog timeout behavior of ADM6316CW25ARJZ-R7, and how is it cleared?

The ADM6316CW25ARJZ-R7 features a 6.3 ms typical watchdog timeout (W suffix), cleared by any logic transition (low-to-high or high-to-low) on the WDI pin with minimum pulse width of 50 ns. If WDI remains static beyond this period, RESET is asserted. The timer also resets automatically upon VCC undervoltage or MR activation. This behavior ensures rapid detection of firmware stalls while allowing flexible microprocessor GPIO usage, and the ADM6316CW25ARJZ-R7's WDI input draws only 120–160 µA when driven high, optimizing power efficiency.

Can ADM6316CW25ARJZ-R7 operate reliably during severe power supply transients?

Yes, the ADM6316CW25ARJZ-R7 incorporates dedicated glitch rejection circuitry that ignores fast VCC transients - for example, a 100 mV dip below threshold lasting ≤8 µs does not trigger reset (Figure 14). Combined with an optional 0.1 µF bypass capacitor near VCC, it meets industrial immunity requirements. This transient resilience is validated across temperature and ensures deterministic operation in electrically noisy environments, and the ADM6316CW25ARJZ-R7 maintains guaranteed RESET validity down to VCC = 1 V even during such events.

How does the manual reset (MR) input function on ADM6316CW25ARJZ-R7?

The MR pin on ADM6316CW25ARJZ-R7 is an active-low input with internal 52 kΩ pull-up, requiring a ≥1 µs low pulse to assert RESET. It includes on-chip debounce and rejects noise spikes <100 ns. When MR transitions high, RESET remains active for the full 140 ms timeout period before deassertion - ensuring reliable microprocessor restart. This eliminates external RC networks, and the ADM6316CW25ARJZ-R7's MR interface is directly compatible with standard tactile switches used in field-service and diagnostic reset functions.