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.
SN54/74LS398 SN54/74LS399 QUAD 2-PORT REGISTER LOW POWER SCHOTTKY • • • • Select From Two Data Sources Fully Positive Edge-Triggered Operation Both True and Complemented Outputs on SN54/ 74LS398 Input Clamp Diodes Limit High...

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