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74ACT399 View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
View to exact match
74ACT399
Fairchild
Fairchild Semiconductor Fairchild
74ACT399 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
Functional Description
Function Table
The AC/ACT399 is a high-speed quad 2-port register. It
selects four bits of data from either of two sources (Ports)
Inputs
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.
S
I0
L
L
L
H
H
X
H
X
I1
X
CP

X
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
= LOW-to-HIGH Clock Transition
Logic Diagram
Outputs
Q
Q
L
H
H
L
L
H
H
L
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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