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54ACT399L Datenblatt(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teilenummer 54ACT399L
Bauteilbeschribung  Quad 2-Port Register
Download  6 Pages
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Hersteller  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

54ACT399L Datenblatt(HTML) 2 Page - National Semiconductor (TI)

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Functional Description
The ’AC/ACT399 is a high-speed quad 2-port register. It se-
lects four bits of data from either of two sources (Ports) un-
der 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 in-
puts (I
0x,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
Inputs
Outputs
SI
0
I
1
CP
Q
Q
LL
X
N
LH
LH
X
N
HL
HX
L
N
LH
HX
H
N
HL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
N = LOW-to-HIGH Clock Transition
Logic Diagram
DS100356-4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
www.national.com
2


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