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M74HCT648 데이터시트(PDF) 3 Page - STMicroelectronics

부품명 M74HCT648
상세설명  HCT646 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE HCT648 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV.
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HCT648 데이터시트(HTML) 3 Page - STMicroelectronics

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TRUTH TABLE
HCT646 (The truth table for HCT648 is the same as this, but with the outputs inverted)
G
DIR
CAB CBA SAB SBA
A
B
FUNCTION
HX
INPUTS
INPUTS
Both the A bus and the B bus are inputs
X
X
X
X
Z
Z
The output functions of the A and B bus are disabled
X
X
INPUTS
INPUTS
Both the A and B bus are used for inputs to the
internal flip-flops. Data at the bus will be stored on
low to high transition of the clock inputs
LH
iNPUTS
OUTPUTS
The A bus are inputs and the B bus are outputs
X
X*
L
X
L
L
The data at the A bus are displayed at the B bus
HH
X*
L
X
L
L
The data at the A bus are displayed at the B bus.
The data of the A bus are stored to the internal
flip-flop on low to high transition of th clock pulse.
HH
X
X*
H
X
X
Qn
The data stored to the internal flip-flop are dispayed
at the B bus
X*
H
X
L
L
The data at the A bus are stored to the internal flip-
flop on low to high transition of the clock pulse. The
states of the internal flip-flops output directly to the
B bus
HH
LL
OUTPUTS
INPUTS
The A bus are outputs and the B bus are inputs
X*
X
X
L
L
L
The data at the B bus are displayed at the A bus
HH
X*
X
L
L
L
The data at the B bus are displayed at the A bus.
The data of the B bus are stored to the internal flip-
flop on low to high transition of the clock pulse
HH
X*
X
X
H
Qn
X
The data stored to the internal flip-flops are
displayed at the B bus
x*
X
H
L
L
the data at the B bus are stored to the internal flip-
flop on low to high transition of the clock pulse. The
states of the internal flip-flops output directly to the
A bus
HH
X
: DON’T CARE
Z
: HIGH IMPEDANCE
Qn
: THE DATA STORED TO THE INTERNAL FLIP-FLOPS BY MOST RECENT LOW TO HIGH TRANSITION OF THE CLOCK INPUTS
*
: THE DATA AT THE A AND B BUS WILL BE STORED TO THE INTERNAL FLIP-FLOPS ON EVERY LOW TO HIGH TRANSITION OF
THE CLOCK INPUTS
M74HCT646/648
3/12


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