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74ABT657 Datasheet PDF : 17 Pages
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NXP Semiconductors
74ABT657
Octal transceiver with parity generator/checker; 3-state
6. Functional description
6.1 Function selection
Table 3. Function selection[1]
Number of
Inputs
inputs HIGH OE
T/R
0, 2, 4, 6 and 8 L
H
(even)
L
H
L
L
L
L
L
L
L
L
1, 3, 5 and 7 L
H
(odd)
L
H
L
L
L
L
L
L
L
L
Don’t care
H
X
ODD/EVEN
H
L
H
H
L
L
H
L
H
H
L
L
X
[1] H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF-state.
Data I/O
PARITY
H
L
H
L
H
L
L
H
H
L
H
L
Z
Output
ERROR
Z
Z
H
L
L
H
Z
Z
L
H
H
L
Z
Mode
transmit
transmit
receive
receive
receive
receive
transmit
transmit
receive
receive
receive
receive
3-state
74ABT657_3
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 03 — 15 March 2010
© NXP B.V. 2010. All rights reserved.
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