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54LS379 데이터시트(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 54LS379
상세설명  Quad Parallel Register with Enable
PDF  6 Pages
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

54LS379 데이터시트(HTML) 3 Page - National Semiconductor (TI)

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Switching Characteristics
VCC ea50V TA ea25 C (See Section 1 for test waveforms and output load)
Symbol
Parameter
RL e 2kX CL e 15 pF
Units
Min
Max
fmax
Maximum Clock Frequency
30
MHz
tPLH
Propagation Delay
27
ns
tPHL
CP to Qn
27
Functional Description
The LS379 consists of four edge-triggered D-type flip-flops
with individual D inputs and Q and Q outputs The Clock
(CP) and Enable (E) inputs are common to all flip-flops
When the E input is HIGH the register will retain the present
data independent of the CP input The Dn and E inputs can
change when the clock is in either state provided that the
recommended setup and hold times are observed
Truth Table
Inputs
Outputs
E
CP
Dn
Qn
Qn
H
L
X
No
No
Change
Change
L
L
HH
L
L
L
LL
H
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Logic Diagram
TLF10186 – 3
3



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