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74ACQ657 Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part No. 74ACQ657
Description  Quiet Series™ Octal Bidirectional Transceiver with 8-Bit Parity Generator/Checker and 3-STATE Outputs
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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74ACQ657 Datasheet(HTML) 2 Page - Fairchild Semiconductor

 
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Functional Description
The Transmit/Receive (T/R) input determines the direction
of the data flow through the bidirectional transceivers.
Transmit (active HIGH) enables data from the A-Port to the
B-Port; Receive (active LOW) enables data from the B-Port
to the A-Port.
The Output Enable (OE) input disables the parity and
ERROR outputs and both the A and B Ports by placing
them in a HIGH-Z condition when the Output Enable input
is HIGH.
When transmitting (T/R HIGH), the parity generator detects
whether an even or odd number of bits on the A-Port are
HIGH and compares these with the condition of the parity
select (ODD/EVEN). If the Parity Select is HIGH and an
even number of A inputs are HIGH, the Parity output is
HIGH.
In receiving mode (T/R LOW), the parity select and number
of HIGH inputs on port B are compared to the condition of
the Parity input. If an even number of bits on the B-Port are
HIGH, the parity select is HIGH, and the PARITY input is
HIGH, then ERROR will be HIGH to indicate no error. If an
odd number of bits on the B-Port are HIGH, the parity
select is HIGH, and the PARITY input is HIGH, the ERROR
will be LOW indicating an error.
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Z
= High Impedance
Function Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Number of
Inputs
Input/
Outputs
Inputs That
Output
Are High
OE
T/R
ODD/EVEN
Parity
ERROR
Outputs Mode
0, 2, 4, 6, 8
L
H
H
H
Z
Transmit
LH
L
L
Z
Transmit
L
L
H
H
H
Receive
LL
H
L
L
Receive
L
L
L
H
L
Receive
LLLL
H
Receive
1, 3, 5, 7
L
H
H
L
Z
Transmit
LH
LH
Z
Transmit
LL
H
H
L
Receive
LL
H
L
H
Receive
L
L
L
H
H
Receive
LLLLL
Receive
Immaterial
H
X
X
Z
Z
Z
Inputs
Outputs
OE
T/R
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
High-Z State


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