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DM54LS377 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DM54LS377
Description  Octal D Flip-Flop with Common Enable and Clock
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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DM54LS377 Datasheet(HTML) 3 Page - National Semiconductor (TI)

   
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Switching Characteristics VCC ea50V TA ea25 C
Symbol
Parameter
RL e 2kX CL e 15 pF
Units
Min
Max
fmax
Maximum Clock Frequency
30
MHz
tPLH
Propagation Delay
25
ns
tPHL
CP to Qn
25
Functional Description
The ’LS377 consists of eight edge-triggered D flip-flops with
individual D inputs and Q outputs The Clock (CP) and En-
able input (E) are common to all flip-flops
When E is LOW new data is entered into the register on the
next LOW-to-HIGH transition of CP When E is HIGH the
register will retain the present data independent of the CP
Truth Table
Inputs
Output
E
CP
Dn
Qn
H
X
X
No Change
L
L
HH
L
L
LL
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Logic Symbol
TLF9831 – 2
VCC e Pin 20
GND e Pin 10
Logic Diagram
TLF9831 – 3
3


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