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DM54LS323 Folha de dados(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças DM54LS323
Descrição Electrónicos  8-Bit Universal Shift/Storage Register with Synchronous Reset and Common I/O Pins
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM54LS323 Folha de dados(HTML) 4 Page - National Semiconductor (TI)

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Functional Description
The ’LS323 contains eight edge-triggered D-type flip-flops
and the interstage logic necessary to perform synchronous
reset shift left shift right parallel load and hold operations
The type of operation is determined by S0 and S1 as shown
in the Mode Select Table All flip-flop outputs are brought
out through TRI-STATE buffers to separate IO pins that
also serve as data inputs in the parallel load mode Q0 and
Q7 are also brought out on other pins for expansion in serial
shifting of longer words
A LOW signal on SR overrides the Select inputs and allows
the flip-flops to be reset by the next rising edge of CP All
other state changes are also initiated by the LOW-to-HIGH
CP transition Inputs can change when the clock is in either
state provided only that the recommended setup and hold
times relative to the rising edge of CP are observed
A HIGH signal on either OE1orOE2 disables the TRI-
STATE buffers and puts the IO pins in the high impedance
state In this condition the shift load hold and reset opera-
tions can still occur The TRI-STATE buffers are also dis-
abled by HIGH signals on both S0 and S1 in preparation for
a parallel load operation
Mode Select Table
Inputs
Response
SR S1 S0
CP
LX
X
L Synchronous Reset Q0–Q7 e LOW
HH
H
L Parallel Load IOnxQn
HL
H
L Shift Right DS0xQ0 Q0xQ1 etc
HHL
L Shift Left DS7xQ7 Q7xQ6 etc
H
H
H
X
Hold
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
Logic Symbol
TLF9829 – 2
VCC e Pin 20
GND e Pin 10
4


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