Text preview for : 74ls398.pdf part of datasheets 74ls398 . Electronic Components Datasheets Various datasheets 74ls398.pdf
Back to : 74ls398.pdf | Home
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.