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54F399DMQB 查看數據表(PDF) - National ->Texas Instruments

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54F399DMQB Quad 2-Port Register National-Semiconductor
National ->Texas Instruments National-Semiconductor
54F399DMQB Datasheet PDF : 10 Pages
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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
Logic Diagram
Function Table
Inputs
Outputs
S
I0
I1
Q
Q
I
I
X
L
H
I
h
X
H
L
h
X
I
L
H
h
X
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
TL F 9533 – 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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