74F399 Datasheet | National Semiconductor

54F 74F398 54F 74F399 Quad 2-Port Register .. May 1995 54F 74F398 54F 74F399 Quad 2-Port Register General Description The ’F398 and ’F399 are the logical equivalents of a quad 2-input multiplexer feeding into four edge-triggered flipflops A mon Select input determines which of the two 4-bit words is accepted The selected data enters the flipflops on the rising edge of the clock The ’F399 is the 16-pin version of the ’F398 with only the Q outputs of the flip-flops available Features Y Select inputs from two data sources Y Fully positive edge-triggered operation Y Both true and plement outputs ’F398 Y Guaranteed 4000V minimum ESD protection ’F399 mercial...