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54ACTQ657L Arkusz danych(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numer części 54ACTQ657L
Szczegółowy opis  Quiet Series Octal Bidirectional Transceiver with 8-Bit Parity Generator/Checker and TRI-STATE Outputs
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Producent  NSC [National Semiconductor (TI)]
Strona internetowa  http://www.national.com
Logo NSC - National Semiconductor (TI)

54ACTQ657L Arkusz danych(HTML) 3 Page - National Semiconductor (TI)

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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; Re-
ceive (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 se-
lect (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.
www.national.com
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