74ABT657 Ver la hoja de datos (PDF) - Philips Electronics
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74ABT657 Datasheet PDF : 11 Pages
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Philips Semiconductors
Octal transceiver with parity generator/checker
(3-State)
Product specification
74ABT657
LOGIC SYMBOL
2 3 4 5 6 8 9 10
A0 A1 A2 A3 A4 A5 A6 A7
1
T/R
24
OE
11
ODD/EVEN
PARITY
13
ERROR
12
B0 B1 B2 B3 B4 B5 B6 B7
23 22 21 20 17 16 15 14
SA00182
FUNCTION TABLE
NUMBER OF HIGH INPUTS
OE
L
L
0, 2, 4, 6, 8
L
L
L
L
L
L
1, 3, 5, 7
L
L
L
L
Don’t care
H
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance ”off” state
LOGIC SYMBOL (IEEE/IEC)
1
24
ƪ ƫ 0
1
0 BUS B TO A
M
0
2
1 BUS A TO B
2 HIGH Z
11
G3[EVEN]
G4[ODD]
2K
=
1,3[EVEN]
1,4[ODD]
0,3[EVEN
0,4]ODD
2
0
2
3
4
5
6
8
9
10
13
12
23
22
21
20
17
16
15
14
SA00194
INPUTS
T/R
ODD/EVEN
H
H
H
L
L
H
L
H
L
L
L
L
H
H
H
L
L
H
L
H
L
L
L
L
X
X
INPUT/
OUTPUT
PARITY
H
L
H
L
H
L
L
H
H
L
H
L
Z
OUTPUTS
ERROR
Z
Z
H
L
L
H
Z
Z
L
H
H
L
Z
OUTPUTS MODE
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3-State
1995 Dec 11
3
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