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74ACT818 - 8-Bit Diagnostic Register

General Description

The ACT818 is a high-speed, general-purpose pipeline register with an on-board diagnostic register for performing serial diagnostics and/or writable control store loading.

The D-to-Y path provides an 8-bit parallel data path pipeline register for normal system operation.

Key Features

  • s On-line and off-line system diagnostics s Swaps the contents of diagnostic register and output register s Diagnostic register and diagnostic testing s Cascadable for wide control words as used in microprogramming s Edge-triggered D registers s Outputs source/sink 24 mA s ACT818 has TTL-compatible inputs s ACT818 is functionally- and pin-compatible to AMD Am29818 and MMI 74S818.

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Other Datasheets by Fairchild (now onsemi)

Part Number Description
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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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74ACT818 8-Bit Diagnostic Register July 1988 Revised September 2000 74ACT818 8-Bit Diagnostic Register General Description The ACT818 is a high-speed, general-purpose pipeline register with an on-board diagnostic register for performing serial diagnostics and/or writable control store loading. The D-to-Y path provides an 8-bit parallel data path pipeline register for normal system operation. The diagnostic register can load parallel data to or from the pipeline register and can output data through the D input port (as in WCS loading). The 8-bit diagnostic register has multiplexer inputs that select parallel inputs from the Y-port or adjacent bits in the diagnostic register to operate as a right-shift-only register.