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MC14508BDW Arkusz danych(PDF) 5 Page - Motorola, Inc

Numer części MC14508BDW
Szczegółowy opis  Dual 4-Bit Latch
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Producent  MOTOROLA [Motorola, Inc]
Strona internetowa  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC14508BDW Arkusz danych(HTML) 5 Page - Motorola, Inc

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MOTOROLA CMOS LOGIC DATA
MC14508B
348
3–STATE MODE OF OPERATION
The MC14508B can be used in bussed systems as shown.
The output terminals of N 4–bit latches can be directly wired
to a bus line, and to one of the 4–bit latches selected. The
selected latch controls the logic state of the bus line and the
remaining (N–1) 4–bit latches are disabled into a high imped-
ance “off” state. The number of latches, N, which may be
connected to a bus line is determined from the output drive
current, IOD, the 3–state or disabled output leakage current,
ITL, and the load current, IL, required to drive the bus line (in-
cluding fanout to other device inputs) and can be calculated
by the following:
ITL
N =
+ 1
IOD – IL
N must be calculated for both high and low logic states of the
bus line.
SELECTED AS
DRIVING DEVICE
1/2
MC14508B
DISABLED
1/2
MC14508B
DISABLED
1/2
MC14508B
IOD
IOD
ITL
ITL
ITL
ITL
IL
IL
BUS LINES
TYPICAL 3–STATE APPLICATIONS
EXAMPLE 1
EXAMPLE 2
DISABLE
DISABLE
STROBE
SERIAL
DATA
CLOCK
RESET
4–LINE DATA BUS
MC14015B
MC
14508B
4–BIT SHIFT
REGISTER
4–BIT SHIFT
REGISTER
QUAD LATCH
(3–STATE)
QUAD LATCH
(3–STATE)
3–STATE
4–BIT LATCH
3–STATE
4–BIT LATCH
3–STATE
4–BIT LATCH
4–LINE DATA BUS
MC
14508B
3–STATE
4–BIT LATCH
4–LINE DATA BUS
MC14519B
A
B
DATA BUS
3–STATE
4–BIT LATCH
14508B
MC


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