MC74F399

www.DataSheet4U.com MC54/74F399 QUAD 2-PORT REGISTER The MC54/74F399 is the logical equivalent of a quad 2-input multiplexer feeding into four edge-triggered flip flops. A common 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 MC54/74F399 is the 16-pin version of the MC54/74F398, with only the Q outputs of the flip-flops available. QUAD 2-PORT REGISTER FAST™ SCHOTTKY TTL Select Inputs from Two Data Sources Fully Positive Edge-Triggered Operation CONNECTION DIAGRAM (TOP VIEW) VCC 16 Qd 15 I0d 14 I1d 13 I1c 12 I0c 11 Qc 10 CP 9 J SUFFIX CERAMIC CASE 620-09 16 1 1 S 2 Qa 3 I0a 4 I1a 5 I1b 6 I0b 7 Qb 8 GND 16 1 N SUFFIX PLASTIC CASE 648-08 LOGIC DIAGRAM I0a S I1a D CP Qa 16 1 D SUFFIX SOIC CASE 751B-03 ORDERING INFORMATION MC54FXXXJ MC74FXXXN MC74FXXXD Ceramic Plastic SOIC I0b D I1b CP Qb LOGIC SYMBOL I0c D I1c CP 1 D I1d CP 2 CP NOTE: This diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Qc 3 4 6 5 11 12 14 13 I0d Qd S CP I0a I1a I0b I1b I0c I1c I0d I1d 9 Qa Qb 7 Qc 10 Qd 15 VCC = PIN 16 GND = PIN 8 FAST AND LS TTL DATA 4-192 MC54/74F399 FUNCTIONAL DESCRIPTION The MC54/74F398 is a high-speed quad 2-port register. It will select four bits of data from either of two sources (Ports) under control of a common Select input (S). The selected data is transferred to a 4-bit output register...