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74F544 Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza 74F544
Descripción Electrónicos  Octal Registered Transceiver
Download  10 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

74F544 Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagrams
Pin Assignment for
DIP SOIC and Flatpak
TLF9555 – 3
Pin Assignment
for LCC
TLF9555 – 4
Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
OEAB
A-to-B Output Enable Input (Active LOW)
1010
20 mA b06 mA
OEBA
B-to-A Output Enable Input (Active LOW)
1010
20 mA b06 mA
CEAB
A-to-B Enable Input (Active LOW)
1020
20 mA b12 mA
CEBA
B-to-A Enable Input (Active LOW)
1020
20 mA b12 mA
LEAB
A-to-B Latch Enable Input (Active LOW)
1010
20 mA b06 mA
LEBA
B-to-A Latch Enable Input (Active LOW)
1010
20 mA b06 mA
A0–A7
A-to-B Data Inputs or
351083
70 mA b650 mA
B-to-A TRI-STATE Outputs
15040(333)
b
3 mA24 mA (20 mA)
B0–B7
B-to-A Data Inputs or
351083
70 mA b650 mA
A-to-B TRI-STATE Outputs
6001066(80) b12 mA64 mA (48 mA)
Functional Description
The ’F544 contains two sets of eight D-type latches with
separate input and output controls for each set For data
flow from A to B for example the A-to-B Enable (CEAB)
input must be LOW in order to enter data from A0–A7 or
take data from B0–B7 as indicated in the Data IO Control
Table With CEAB LOW a LOW signal on the A-to-B Latch
Enable (LEAB) input makes the A-to-B latches transparent
a subsequent LOW-to-HIGH transition of the LEAB signal
puts the A latches in the storage mode and their outputs no
longer change with the A inputs With CEAB and OEAB both
LOW the TRI-STATE
B output buffers are active and re-
flect the data present at the output of the A latches Control
of data flow from B to A is similar but using the CEBA
LEBA and OEBA inputs
Data IO Control Table
Inputs
Latch Status
Output Buffers
CEAB
LEAB
OEAB
H
X
X
Latched
High Z
X
H
X
Latched
L
L
X
Transparent
X
X
H
High Z
L
X
L
Driving
H e HIGH Voltage Level
L e LOW Voltage Level
X e Immaterial
A-to-B data flow shown B-to-A flow control is the same
except using CEBA LEBA and OEBA
2


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