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74F399SJ Scheda tecnica(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte 74F399SJ
Spiegazioni elettronici  Quad 2-Port Register
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F399SJ Scheda tecnica(HTML) 3 Page - National Semiconductor (TI)

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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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