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74ACT399SC Fiches technique(PDF) 2 Page - Fairchild Semiconductor

No de pièce 74ACT399SC
Description  Quad 2-Port Register
Download  9 Pages
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Fabricant  FAIRCHILD [Fairchild Semiconductor]
Site Internet  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

74ACT399SC Fiches technique(HTML) 2 Page - Fairchild Semiconductor

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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
S
I0
I1
CP
Q
Q
LL
X

LH
LH
X

HL
HX
L

LH
HX
H

HL


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