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74AC399 Datasheet(PDF) 2 Page - Fairchild Semiconductor |
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74AC399 Datasheet(HTML) 2 Page - Fairchild Semiconductor |
2 / 8 page www.fairchildsemi.com 2 Functional Description The AC/ACT399 is a high-speed quad 2-port register. It selects 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 synchronous with the LOW-to-HIGH transition of the Clock input (CP). The 4-bit D-type output register is fully edge-triggered. 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. Function Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial = LOW-to-HIGH Clock Transition Logic Diagram Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Inputs Outputs SI0 I1 CP Q Q LL X LH LH X HL HX L LH HX H HL |
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Similar Description - 74AC399 |
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