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54F676LM Folha de dados(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças 54F676LM
Descrição Electrónicos  16-Bit Serial/Parallel-In, Serial-Out Shift Register
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

54F676LM Folha de dados(HTML) 2 Page - National Semiconductor (TI)

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TLF9588 – 1
IEEEIEC
TLF9588 – 4
Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
P0–P15
Parallel Data Inputs
1010
20 mA b06 mA
CS
Chip Select Input (Active LOW)
1010
20 mA b06 mA
CP
Clock Pulse Input (Active LOW)
1010
20 mA b06 mA
M
Mode Select Input
1010
20 mA b06 mA
SI
Serial Data Input
1010
20 mA b06 mA
SO
Serial Output
50333
b
1 mA20 mA
Functional Description
The 16-bit shift register operates in one of three modes as
indicated in the Shift Register Operations Table
HOLD
a HIGH signal on the Chip Select (CS) input pre-
vents clocking and data is stored in the sixteen registers
ShiftSerial Load
data present on the SI pin shifts into
the register on the falling edge of CP Data enters the Q0
position and shifts toward Q15 on successive clocks finally
appearing on the SO pin
Parallel Load
data present on P0–P15 are entered into
the register on the falling edge of CP The SO output repre-
sents the Q15 register output
To prevent false clocking CP must be LOW during a LOW-
to-HIGH transition of CS
Shift Register Operations Table
Control Input
Operating Mode
CS
MCP
H
X
X
Hold
LL
K
ShiftSerial Load
LH
K
Parallel Load
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
K e HIGH-to-LOW Transition
Block Diagram
TLF9588 – 5
2


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