QUAD 2-PORT REGISTER
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 input
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 features
both Q and Q inputs, while the SN54/74LS399 has only Q outputs.
• Select From Two Data Sources
• Fully Positive Edge-Triggered Operation
• Both True and Complemented Outputs on SN54/74LS398
• Input Clamp Diodes Limit High-Speed Termination Effects
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