Analog Devices Inc. ADM1068ASTZ-REEL7

Overview

ADM1068ASTZ-REEL7 from Analog Devices is a configurable supervisory and sequencing IC for multivoltage systems, featuring eight programmable supply fault detectors with ±1% accuracy across −40°C to +85°C, eight SMBus-programmable driver outputs (six with charge-pumped 12 V gate drive), and a state-machine-based sequencing engine supporting up to 63 states. It enables precise power-up/down sequencing and fault handling in DSP/FPGA supply rails.

For engineers reviewing the ADM1068ASTZ-REEL7 datasheet, ADM1068ASTZ-REEL7 pinout, ADM1068ASTZ-REEL7 application, or ADM1068ASTZ-REEL7 equivalent, key selection criteria include input voltage range flexibility (0.573 V–14.4 V), dual-mode VXx inputs (analog SFD or digital logic), VDDCAP arbitration from VPx/VH, EEPROM-configurable sequencing, and 32-lead LQFP package compatibility with industrial thermal requirements.

Technical Context

The ADM1068ASTZ-REEL7 implements a deterministic state-machine sequencing engine with 63 programmable states, where transitions are triggered by input events (e.g., supply OK, fault assertion) and support conditional branching, power-up/power-down sequence control, and integrated watchdog functions. Its eight inputs include VH (6–14.4 V high-range), VP1–VP3 (1.25–6 V mid/low ranges), and VX1–VX4 (0.573–1.375 V ultralow range or TTL/CMOS logic inputs).

All eight programmable driver outputs (PDO1–PDO8) support multiple modes: open-collector with external pull-up, push-pull to VDDCAP or VPx, weak pull-up to VDDCAP/VPx, and charge-pumped high-voltage mode (PDO1–PDO6 only, VOH = 10.5–14 V at 1 μA). The device powers itself via internal arbitration among VPx and VH pins, delivering a regulated 4.75 V VDDCAP output with 10 μF decoupling.

Key Specifications

Pinout & Package

ADM1068ASTZ-REEL7 is housed in a 32-lead 7 mm × 7 mm LQFP package with exposed pad (θJA = 54°C/W), suitable for industrial PCB layouts requiring thermal reliability and surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multirail supervisory and sequencing applications.

Compared with TPS659122ZQWR and MAX16053ATL+T, ADM1068ASTZ-REEL7 uniquely combines 8-channel programmable supervision, charge-pumped 12 V gate drive, 63-state sequencing logic, and 256-byte EEPROM in a single LQFP package - making it the only option for complex, reconfigurable, high-voltage board-level power management without external logic or level shifters.

Availability

ADM1068ASTZ-REEL7 is available at Aetrix Electronics and suitable for DSP/FPGA supply sequencing, server board supply management, multivoltage line card control, in-circuit supply margining, and central office system power supervision requiring stable component supply and long-term lifecycle support.

Supply support for ADM1068ASTZ-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 centers worldwide and ISO 9001-certified manufacturing.

The ADM1068ASTZ-REEL7 belongs to Analog Devices' Super Sequencer® family, designed specifically for intelligent, software-configurable power sequencing and fault monitoring in high-reliability multivoltage systems such as telecom infrastructure, enterprise servers, and industrial controllers.

FAQ

What is the maximum input voltage the ADM1068ASTZ-REEL7 can supervise directly on the VH pin?

The ADM1068ASTZ-REEL7 supports a maximum direct input voltage of 14.4 V on the VH pin when configured in the high-range attenuation mode. This allows supervision of standard 12 V backplane supplies without external resistor dividers. Absolute maximum rating is 16 V, but operation above 14.4 V violates specification limits and may cause inaccurate fault detection or damage.

Does the ADM1068ASTZ-REEL7 require an external crystal or oscillator?

No, the ADM1068ASTZ-REEL7 does not require an external crystal or oscillator. It contains an internal 90–110 kHz oscillator that drives all timing functions, including the sequencing engine state transitions, glitch filter timeouts, and internal clock domains. No external timing components are needed for basic or advanced sequencing operation.

Can the VXx pins on the ADM1068ASTZ-REEL7 be used simultaneously as both analog inputs and digital inputs?

No, each VXx pin (VX1–VX4) on the ADM1068ASTZ-REEL7 must be configured exclusively as either an analog supply fault detector (SFD) or a digital logic input - not both simultaneously. When configured as digital inputs, their analog function is remapped as secondary SFDs onto VPx or VH pins, preserving total analog monitoring capability but requiring shared resource allocation.

What is the purpose of the VDDCAP pin on the ADM1068ASTZ-REEL7, and what capacitor value is recommended?

The VDDCAP pin on the ADM1068ASTZ-REEL7 delivers a regulated 4.75 V internal supply generated from the highest active VPx or VH rail. A minimum 10 μF ceramic or tantalum capacitor is required between VDDCAP and GND to ensure stability, decouple noise, and provide hold-up energy during brief brownouts. Using less capacitance risks sequencing instability or EEPROM write corruption during supply transients.

How many unique sequencing states does the ADM1068ASTZ-REEL7 support, and how are they programmed?

The ADM1068ASTZ-REEL7 supports up to 63 unique programmable states in its sequencing engine, implemented as a deterministic finite-state machine. States are defined and linked via configuration data written to the on-chip 256-byte EEPROM using Analog Devices' GUI-based software tool or direct SMBus register writes - enabling fully customizable power-up, power-down, and fault-response behavior without firmware changes.