54LS399 register equivalent, quad 2-port register.
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 Com.
The SN54 / 74LS398 and SN54 / 74LS399 are high-speed Quad 2-Port Registers. They select four bits of data from two sources (Ports) under the control of a common Select Input (S). The selected data is transferred to a 4-Bit Output Register synchronous.
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