Service Manuals, User Guides, Schematic Diagrams or docs for : . Electronic Components Datasheets Various datasheets 74ls398

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                                                                                                                    SN54/74LS398
QUAD 2-PORT REGISTER                                                                                                SN54/74LS399
  The SN54 / 74LS398 and SN54 / 74LS399 are Quad 2-Port Registers. They
are the logical equivalent of a quad 2-input multiplexer followed by a quad 4-bit
edge-triggered register. A Common Select input selects between two 4-bit in-
put ports (data sources). The selected data is transferred to the output register
on the LOW-to-HIGH transition of the Clock input. The SN54/ 74LS398 fea-                                             QUAD 2-PORT REGISTER
tures both Q and Q inputs, while the SN54 / 74LS399 has only Q outputs.

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