Analog Devices Inc. ADM6318CZ28ARJZ-R7

Overview

ADM6318CZ28ARJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and dual active-low/active-high push-pull reset outputs, designed for microprocessor supply voltage monitoring. It features a 2.8 V reset threshold (±2.5% over −40°C to +85°C), 140 ms minimum reset timeout, 25.6 s typical watchdog timeout, and operates from 1 V to 5.5 V supply. It is used in embedded controllers where reliable power-on reset and code execution integrity are critical.

For engineers reviewing the ADM6318CZ28ARJZ-R7 datasheet, ADM6318CZ28ARJZ-R7 pinout, ADM6318CZ28ARJZ-R7 application, or ADM6318CZ28ARJZ-R7 equivalent, key selection criteria include its dual-reset output configuration, industrial-temperature-rated 2.8 V threshold, 25.6 s watchdog period, SOT-23-5 package compatibility, and absence of manual reset input - distinguishing it from ADM6316/ADM6317 variants.

Technical Context

The ADM6318CZ28ARJZ-R7 implements a precision bandgap-based voltage reference to monitor VCC against a factory-trimmed 2.8 V threshold with ±2.5% tolerance across −40°C to +85°C and 40 ppm/°C temperature coefficient. Its reset generator asserts both RESET and RESET outputs low/high simultaneously for ≥140 ms after VCC rises above threshold or watchdog timeout expiration.

Its watchdog circuit clears on any logic transition at WDI (min. 50 ns pulse width) and times out after 25.6 s (typical); no manual reset input is present, and the device lacks open-drain output stages - confirming its role as a dual-output, watchdog-enabled supervisor without user-initiated reset capability.

Key Specifications

Pinout & Package

ADM6318CZ28ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.8–3.0 mm body length. Pin 1 is RESET (active low), Pin 2 is GND, Pin 3 is RESET (active high), Pin 4 is WDI, and Pin 5 is VCC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6318CZ28ARJZ-R7, ADM6318CY29ARJZ-R7 trades longer watchdog coverage for higher reset threshold precision, while ADM6321CZ28ARJZ-R7 replaces dual push-pull outputs with open-drain + push-pull to enable shared reset bus topologies - neither offers pin-to-pin compatibility due to differing output stage configurations.

Availability

ADM6318CZ28ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, smart energy meters, and automotive body control modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.

Supply support for ADM6318CZ28ARJZ-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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control systems.

The ADM63xx family was engineered to deliver robust, low-power supply supervision and watchdog functionality for microprocessor-based systems operating in harsh industrial and portable environments.

FAQ

What is the exact reset threshold voltage of ADM6318CZ28ARJZ-R7 and how does it vary with temperature?

The ADM6318CZ28ARJZ-R7 has a nominal reset threshold of 2.8 V, specified as 2.73 V to 2.87 V (±2.5%) over the full industrial temperature range of −40°C to +85°C. Its temperature coefficient is 40 ppm/°C, meaning threshold drift is bounded and predictable - for example, a 60°C rise from 25°C causes ≤2.4 mV shift. This ensures consistent brownout detection across operating conditions without recalibration.

Does ADM6318CZ28ARJZ-R7 include a manual reset input (MR) pin?

No, ADM6318CZ28ARJZ-R7 does not feature a manual reset input. Per Table 1 and Pin Function Descriptions in the datasheet, only ADM6316, ADM6317, ADM6319, ADM6320, and ADM6322 include MR functionality. ADM6318 relies solely on VCC monitoring and watchdog timeout for reset assertion - making it appropriate for systems where external push-button reset is unnecessary or handled elsewhere.

What are the timing characteristics of the dual reset outputs in ADM6318CZ28ARJZ-R7?

Both RESET (active low) and RESET (active high) outputs in ADM6318CZ28ARJZ-R7 assert/deassert simultaneously with identical timing: reset remains active for ≥140 ms after VCC rises above 2.8 V, and deasserts within 40 µs of VCC falling below threshold. Rise/fall times are ≤25 ns (10%–90% VCC, CL = 5 pF), ensuring clean, synchronized reset signaling to multiple downstream devices.

Can ADM6318CZ28ARJZ-R7 operate with supply voltages below 2.8 V?

Yes, ADM6318CZ28ARJZ-R7 operates from 1 V to 5.5 V and guarantees valid reset output states down to VCC = 1 V. While the 2.8 V threshold defines the reset assertion point, the IC continues functioning - asserting RESET low and RESET high - even as VCC drops from 2.8 V to 1 V, enabling controlled shutdown sequencing in brownout scenarios.

How is the watchdog timer disabled in ADM6318CZ28ARJZ-R7?

The watchdog timer in ADM6318CZ28ARJZ-R7 is disabled by leaving the WDI pin unconnected (floating). The internal window comparator disconnects the watchdog timer from the reset circuitry when WDI is floating, preventing timeout-induced resets. No external pull-up or pull-down is required - this is a defined, documented disable method per the datasheet's "Watchdog Input" section.