ASNT8144-KMC

Specialized ICS Overview

The ASNT8144-KMC is a specialized integrated circuit functioning as a Pseudorandom Binary Sequence (PRBS) generator. Manufactured by ADSANTEC, it generates selectable full-length sequences of either 2^15-1 or 2^7-1 bits using linear feedback shift registers with XOR-based polynomial taps. The device supports output data rates from DC to 23Gbps and includes an asynchronous reset signal to prevent the illegal 'all zeros' state. It features fully differential CML interfaces for clock, data, and synchronization outputs, powered by a single +3.3V or -3.3V supply with a typical power consumption of 850mW.

Specialized ICS Feature Summary

• Generates PRBS patterns with selectable polynomials: (x^15 + x^14 + 1) for 32767-bit length or (x^7 + x^6 + 1) for 127-bit length.
• Supports high-speed operation with output data rates ranging from DC to 23Gbps.
• Includes a dedicated synchronization signal output generated by dividing the sequence by 32 or 8192.
• Features fully differential CML input and output interfaces with internal 50 Ohm termination resistors.

Specialized ICS Applications

• Testing Equipment
• High-speed serial link validation
• Bit error rate testing

Specialized ICS Procurement Notes

Verify that the PCB layout accommodates the custom 24-pin CQFP package dimensions and thermal requirements. Ensure the design supports the specific power supply configuration (positive or negative 3.3V) as I/O termination strategies differ between modes. Confirm compatibility with the required CML signaling levels and AC/DC coupling preferences before ordering.

Specialized ICS Selection Notes

Select this component when a deterministic PRBS source with adjustable pattern lengths is required for high-speed digital testing. The choice between positive and negative power supplies dictates the necessary external termination network; use AC termination for positive supply configurations connected to grounded loads. Ensure the system clock can reach up to 23GHz to utilize the maximum data rate capability.

Specialized ICS Part Context

The ASNT8144-KMC belongs to the ASNT8144 family of PRBS generators produced by Advanced Science And Novel Technology Company, Inc. The suffix '-KMC' identifies the specific custom 24-pin CQFP package type and pinout configuration. This part is designed for niche applications requiring precise pseudo-random signal generation without reliance on general-purpose logic devices.

Specialized ICS Replacement Considerations

No public confirmed substitute part numbers are available in the documentation. Designers should verify if existing test equipment supports the specific CML interface and voltage levels provided by this generator.

Specialized ICS FAQ

How is the 'all zeros' state prevented in the LSFR?

An asynchronous external active-low preset signal (rstn_p/rstn_n) forces the Linear Feedback Shift Register into the 'all ones' state, which allows the PRBS generation to proceed correctly upon release.

What are the power supply options for the ASNT8144-KMC?

The device operates on a single supply of either +3.3V (with VEE at ground) or -3.3V (with VCC at ground). The choice affects the required I/O termination strategy.

What is the function of the syncp/syncn pins?

These pins provide a differential synchronization signal output. The signal consists of one pulse per PRBS period, generated by dividing the sequence count by either 32 or 8192.