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M74HCT651B1R データシート(PDF) 3 Page - STMicroelectronics

部品番号 M74HCT651B1R
部品情報  HCT651 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE, INV. HCT652 OCTAL BUS TRANSCEIVER/REGISTER 3-STATE
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HCT651B1R データシート(HTML) 3 Page - STMicroelectronics

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TRUTH TABLE
HCT652 (The truth table for HCT651 is the same as this, but with the outputs inverted)
GAB GBA CAB CBA SAB SBA
A
B
FUNCTION
LH
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
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 ar displayed at the A bus.
The data of the B bus are stored to the internal
flip-flop on low to high transition of th clock pulse
HH
X*
X
X
H
Qn
X
The data stored to the internal flip-flop are dispayed
at the A 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
HH
INPUTS
OUTPUTS
The A bus are inputs and the B bus are outputs
XX*
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 the clock pulse
HH
X
X*
H
X
X
Qn
The data stored to the internal flip-flops are
displayed 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
HL
OUTPUTS OUTPUTS
Both the A bus and the B bus are outputs
X
X
H
H
Qn
Qn
The data stored to the internal flip-flops are
displayed at the A and B bus respactively
H
H
Qn
Qn
The output at the A bus are displayed at the B bus,
the output at the B bus are displayed at the A bus
respectively
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
M74HCT651/652
3/12


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