Analog Devices Inc. ADM1068ASTZ

Overview

ADM1068ASTZ 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 programmable driver outputs (six with charge-pumped 12 V gate drive), and an SMBus-controlled sequencing engine supporting up to 63 states. It is used in DSP/FPGA supply sequencing and server power-up control.

For engineers reviewing the ADM1068ASTZ datasheet, ADM1068ASTZ pinout, ADM1068ASTZ application, or ADM1068ASTZ equivalent, key selection criteria include its 32-lead LQFP package, VH/VPx/VXx input flexibility (0.573 V–14.4 V supervision range), dual-mode PDO outputs (open-collector, push-pull, weak pull-up), EEPROM-based configuration, and integrated watchdog and interrupt generation.

Technical Context

The ADM1068ASTZ implements a state-machine-based sequencing engine (SE) with 63 programmable states, where transitions are triggered by input events (e.g., supply OK, fault assertion) and enable complex power-up/down sequences and fault-handling logic. Its SE supports SMBus-programmable jumps, warnings, and integration of watchdog timing.

Power is arbitrated among VH (up to 14.4 V) and VP1–VP3 (up to 6.0 V), generating a regulated 4.75 V VDDCAP output; VXx inputs operate as high-impedance analog SFDs (0.573–1.375 V) or CMOS/TTL digital inputs, with glitch filtering (0–100 μs) and programmable hysteresis per channel.

Key Specifications

Pinout & Package

ADM1068ASTZ is housed in a 32-lead 7 mm × 7 mm LQFP package with exposed pad (θJA = 54°C/W). Pin functions are validated per Analog Devices Rev. D datasheet Figure 3 and Table 4.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar supply supervision and sequencing applications.

Compared with ADM1066ASTZ, ADM1068ASTZ adds two VX inputs for expanded warning logic or digital control; compared with TPS386000RGPT, it provides full 8-channel programmability, 12 V gate drive, and EEPROM-based field updates-making it suitable for complex, evolving multivoltage platforms.

Availability

ADM1068ASTZ is available at Aetrix Electronics and suitable for server/routers, DSP/FPGA supply sequencing, and central office systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for ADM1068ASTZ 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 instrumentation, industrial automation, and communications infrastructure.

The ADM1068ASTZ belongs to Analog Devices' Super Sequencer® family, designed specifically for intelligent, software-configurable power supervision and sequencing in high-reliability multivoltage systems such as telecom line cards and enterprise servers.

FAQ

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

The ADM1068ASTZ supports a maximum input voltage of 14.4 V on the VH pin when configured in the high-range detection mode (6.0–14.4 V). This allows direct supervision of 12 V backplane supplies without external attenuation. Absolute maximum rating is 16 V, but operation above 14.4 V violates specification limits and risks incorrect fault detection.

How does the ADM1068ASTZ handle power loss across multiple supply inputs?

The ADM1068ASTZ uses an internal VDD arbitrator that selects the highest valid supply among VH and VP1–VP3 (≥3.0 V) to generate its 4.75 V VDDCAP output. During brownouts, the 10 μF capacitor on VDDCAP sustains operation until the next highest rail takes over-ensuring uninterrupted sequencing and fault monitoring even during transient supply dips.

Can the ADM1068ASTZ drive N-channel MOSFETs directly, and which pins support this?

Yes, the ADM1068ASTZ can directly drive N-channel MOSFET gates using its charge-pumped high-voltage mode on PDO1 through PDO6. These outputs deliver up to 12.5 V at 1 μA load, enabling robust gate turn-on without external boost circuitry-critical for high-side switch control in supply path management.

What is the resolution and accuracy of supply fault detection on the VXx inputs?

The VXx inputs (VX1–VX4) provide 8-bit threshold resolution (step size ≈3.14 mV in 0.573–1.375 V range) and ±1% absolute accuracy across −40°C to +85°C. Their 1 MΩ input impedance allows external resistor dividers to extend supervision to higher voltages (e.g., +24 V, −5 V), maintaining accuracy within datasheet limits when divider tolerances are accounted.

Is the ADM1068ASTZ pin-compatible with earlier revisions like ADM1068ACPZ?

No, the ADM1068ASTZ (32-lead LQFP) is not pin-compatible with the ADM1068ACPZ (32-lead LFCSP). While both share identical functionality and register maps, the LQFP package has different thermal pad layout, lead pitch, and soldering requirements. PCB redesign is required for substitution-package-specific footprint and reflow profiles must be validated separately.