Analog Devices Inc. ADM706ARZ-REEL7

Overview

ADM706ARZ-REEL7 from Analog Devices is a precision 5 V microprocessor supervisory circuit with active-low reset, watchdog timer, and power-fail monitoring. It guarantees valid RESET output down to VCC = 1 V, features 4.40 V reset threshold, 200 ms reset pulse width, and 190 μA quiescent current-enabling reliable system startup and brownout protection in embedded controllers and industrial instrumentation.

For engineers reviewing the ADM706ARZ-REEL7 datasheet, ADM706ARZ-REEL7 pinout, ADM706ARZ-REEL7 application, or ADM706ARZ-REEL7 equivalent, key selection criteria include reset threshold accuracy (4.40 V ±150 mV), watchdog timeout (1.60 sec), PFI comparator trip point (1.25 V), MR debouncing capability, and SOIC-8 package compatibility for space-constrained PCB layouts.

Technical Context

The ADM706ARZ-REEL7 integrates three independent monitoring functions: a precision voltage supervisor with 4.40 V threshold and 40 mV hysteresis, a 1.60 sec watchdog timer cleared by WDI transitions, and a 1.25 V reference-based power-fail comparator (PFI/PFO). All functions operate across −40°C to +85°C with VCC from 1.0 V to 5.5 V.

Its internal 250 μA MR pull-up current enables direct switch connection without external biasing, while RESET remains asserted until VCC exceeds 4.40 V and holds low for ≥200 ms after recovery-ensuring sufficient processor stabilization time during power-up and brownout recovery.

Key Specifications

Pinout & Package

ADM706ARZ-REEL7 is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body size, and gull-wing leads. The package is RoHS-compliant (Z suffix) and reel-packed (REEL7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX706CSA+ and TPS3808G33DBVR, ADM706ARZ-REEL7 uniquely combines 5 V-specific 4.40 V supervision, integrated PFI/PFO for auxiliary monitoring, and guaranteed 1 V operation-making it irreplaceable in legacy or mixed-rail industrial systems requiring full-feature supervision in SOIC-8.

Availability

ADM706ARZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic instruments, telecom remote terminal units, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ADM706ARZ-REEL7 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 design and manufacturing operations worldwide.

The ADM705/ADM706 family was engineered specifically for robust 5 V microprocessor supervision in harsh industrial and instrumentation environments-emphasizing guaranteed low-VCC operation, integrated watchdog, and flexible power-fail monitoring.

FAQ

What is the exact reset threshold voltage for ADM706ARZ-REEL7 and how tightly is it specified?

The ADM706ARZ-REEL7 has a nominal reset threshold of 4.40 V, with a guaranteed range of 4.25 V to 4.50 V over full temperature and supply conditions. This specification ensures consistent brownout detection across industrial temperature ranges (−40°C to +85°C) and eliminates ambiguity in system-level power-margin calculations. The 40 mV hysteresis prevents chatter near the trip point during slow VCC ramps.

Can ADM706ARZ-REEL7 monitor a second power supply, and if so, how is that implemented?

Yes, ADM706ARZ-REEL7 can monitor a second supply using its PFI input and 1.25 V internal reference. A resistive divider scales the auxiliary supply voltage to 1.25 V at PFI when the supply reaches its minimum acceptable level-for example, a 12 V rail monitored with a 9.6 kΩ/1.2 kΩ divider triggers PFO low at 12 V × (1.2/(9.6+1.2)) = 1.25 V. The PFO output then signals power failure to the host processor.

Does ADM706ARZ-REEL7 require external components to function as a complete supervisory solution?

No, ADM706ARZ-REEL7 operates autonomously with only a 0.1 μF VCC-to-GND decoupling capacitor required. Its internal 250 μA MR pull-up eliminates external biasing for manual reset switches, and the integrated 1.25 V reference removes need for external references when using PFI. No timing resistors or capacitors are needed for reset pulse width or watchdog timeout.

How does the watchdog timer in ADM706ARZ-REEL7 interact with the RESET output?

The ADM706ARZ-REEL7 watchdog timer does not directly assert RESET; its WDO output must be externally connected to the MR pin to trigger a system reset on timeout. This design gives designers flexibility: WDO can instead drive an NMI for software recovery, or remain unconnected if only power supervision is needed. RESET is asserted solely by VCC undervoltage or MR activation.

Is ADM706ARZ-REEL7 compatible with modern RoHS-compliant assembly processes and what packaging format does it ship in?

Yes, ADM706ARZ-REEL7 is RoHS-compliant (Z suffix) and qualified for lead-free reflow soldering per JEDEC J-STD-020. It ships in 7-inch tape-and-reel format (REEL7) with 2500 units per reel, optimized for automated SMT placement. The SOIC_N (R-8) package meets IPC-7351B land pattern standards and supports standard 0.65 mm pitch pick-and-place tooling.