Analog Devices Inc. ADM6318CY45ARJZ-R7

Overview

ADM6318CY46ARJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and dual push-pull reset outputs, designed for power supply monitoring and microprocessor system recovery. 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, and operates down to VCC = 1 V with 5 µA quiescent current. It is used in embedded controllers where reliable brownout detection and code-execution integrity are critical.

For engineers reviewing the ADM6318CY46ARJZ-R7 datasheet, ADM6318CY46ARJZ-R7 pinout, ADM6318CY46ARJZ-R7 application, or ADM6318CY46ARJZ-R7 equivalent, key selection criteria include its dual active-low/active-high reset architecture, absence of manual reset input, SOT-23-5 package compatibility, and industrial temperature range support - all essential for space-constrained, low-power microcontroller systems requiring robust fault recovery.

Technical Context

The ADM6318CY46ARJZ-R7 implements a precision voltage reference-based reset generator with hysteresis (3 mV) and temperature coefficient of 40 ppm/°C, ensuring stable threshold behavior across −40°C to +85°C. Its watchdog timer clears on any WDI logic transition (≥50 ns pulse width) and times out after 1.6 s (typical), providing deterministic recovery from software hangs without external components.

This device belongs to the ADM6316–ADM6322 family and is specifically configured with watchdog input (WDI), no manual reset (MR), and dual push-pull RESET/RESET outputs - enabling simultaneous assertion of complementary reset signals to mixed-logic-level microcontrollers or FPGA configuration circuits.

Key Specifications

Pinout & Package

ADM6318CY46ARJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 1.9 mm × 2.9 mm body size, 0.95 mm lead pitch, and gull-wing leads suitable for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADM6318CY46ARJZ-R7, ADM6321CY46ARJZ-R7 offers open-drain flexibility at the cost of added external component count, while TPS3808G33DBVR provides lower-cost basic supervision but omits both watchdog and dual-output features - making ADM6318CY46ARJZ-R7 uniquely suited for compact, self-recovering microcontroller systems demanding precise 4.63 V threshold and complementary reset signaling.

Availability

ADM6318CY46ARJZ-R7 is available at Aetrix Electronics and suitable for industrial PLC controllers, medical handheld diagnostics, automotive body control modules, and smart energy meters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for ADM6318CY46ARJZ-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, with decades of expertise in precision power management and reliability-critical ICs.

The ADM63xx series was developed to address demand for highly integrated, low-power supervisory solutions in space-constrained embedded systems - emphasizing accuracy, temperature stability, and fault-recovery autonomy without external passive components.

FAQ

What is the exact reset threshold voltage of ADM6318CY46ARJZ-R7 and how does it vary with temperature?

The ADM6318CY46ARJZ-R7 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 specified at 40 ppm/°C, meaning threshold drift is bounded and predictable - for example, maximum deviation from 4.63 V at +85°C is approximately 116 mV, well within the ±2.5% band. This ensures consistent brownout detection across operating conditions without calibration.

Does ADM6318CY46ARJZ-R7 include a manual reset input (MR) pin?

No, ADM6318CY46ARJZ-R7 does not include a manual reset input. Per Table 1 in the datasheet, the ADM6318 variant is defined as having watchdog input (WDI) and dual push-pull reset outputs (RESET and RESET), but no MR function. This distinguishes it from ADM6316/ADM6317/ADM6319, which integrate MR. System-level manual reset must therefore be implemented externally if required.

What are the watchdog timeout options available for ADM6318CY46ARJZ-R7 and how is it selected?

The ADM6318CY46ARJZ-R7 uses the "Y" suffix in its ordering code (CY46…), indicating a typical watchdog timeout of 1.6 s (with min/max of 1.12 s / 2.24 s). This is factory-configured and not user-adjustable. The watchdog timer clears on any logic transition (low-to-high or high-to-low) on the WDI pin and asserts reset if no transition occurs within that period - supporting robust detection of firmware stalls without software configuration overhead.

Can ADM6318CY46ARJZ-R7 operate reliably below 1.8 V supply voltage?

Yes, ADM6318CY46ARJZ-R7 is guaranteed to assert valid reset outputs down to VCC = 1 V, as confirmed in the Absolute Maximum Ratings and Specifications tables. Its internal reference and comparators remain functional at this level, and both push-pull outputs meet VOH/VOL specifications even at 1 V - enabling use in ultra-low-voltage battery backup domains or deep brownout recovery scenarios where other supervisors fail.

How does the dual push-pull reset architecture of ADM6318CY46ARJZ-R7 benefit system design?

The dual push-pull outputs (active-low RESET and active-high RESET) allow ADM6318CY46ARJZ-R7 to simultaneously drive microcontrollers requiring /RESET and FPGAs or ASICs requiring active-high reset, eliminating external inverters or level shifters. Each output is independently buffered and rail-to-rail capable, reducing BOM count, PCB area, and signal integrity risks - especially valuable in compact, multi-chip embedded systems where timing alignment and noise immunity are critical.