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74F399 Datasheet(PDF) 4 Page - Texas Instruments |
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74F399 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 12 page ![]() Functional Description The ’F398 and ’F399 are high-speed quad 2-port registers They 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 syn- chronous with the LOW-to-HIGH transition of the Clock in- put (CP) The 4-bit D-type output register is fully edge-trig- gered The Data inputs (I0x I1x) and Select input (S) must be stable only a setup time prior to and hold time after the LOW-to-HIGH transition of the Clock input for predictable operation The ’F398 has both Q and Q outputs Function Table Inputs Outputs SI0 I1 QQ II X L H Ih X H L hX I L H hX h H L H e HIGH Voltage Level L e LOW Voltage Level h e HIGH Voltage Level one setup time prior to the LOW-to-HIGH clock transition I e LOW Voltage Level one setup time prior to the LOW-to-HIGH clock transition X e Immaterial ’F398 only Logic Diagram TLF9533 – 9 ’F398 Only Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays 3 |
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