Philips Semiconductors
Product specification
FB2041
7-bit Futurebus+ transceiver
1995 May 25
5
FUNCTION TABLE
MODE
INPUTS
OEB2
L
L
L
L
X
X
X
X
L
L
L
L
X
X
X
X
X
H
X
H
X
X
X
H
H
X
X
H
H
X
X
H
H
X
X
H
H
X
X
X
X
OUTPUTS
AOn
Z
Z
L
H
Z
Z
L
H
Z
Z
L
H
Z
Z
L
H
X
X
X
X
X
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
Z
Z
Z
Z
AIn
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Bn*
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
X
X
X
X
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
X
X
X
X
OEB0
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
X
H
H
H
L
L
X
X
L
L
X
X
L
L
X
X
L
L
X
X
X
X
X
X
OEB1
L
L
L
L
L
L
L
L
X
X
X
X
X
X
X
X
X
H
H
X
X
X
X
H
H
X
X
H
H
X
X
H
H
X
X
H
H
X
X
X
X
OEB3
L
L
L
L
X
X
X
X
X
X
X
X
L
L
L
L
X
H
X
X
H
X
X
H
H
X
X
H
H
X
X
H
H
X
X
H
H
X
X
X
X
OEA1
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
X
X
X
X
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
X
L
L
X
X
OEA2
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
X
X
X
X
H
H
H
H
X
X
X
X
H
H
H
H
X
X
X
X
L
X
L
X
OEA3
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
X
X
X
X
H
H
H
H
X
X
X
X
X
X
X
X
H
H
H
H
L
X
X
L
Bn*
H**
L
H**
L
H**
L
H**
L
H**
L
H**
L
H**
L
H**
L
H**
H**
H**
H**
H**
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
X
X
X
X
AIn to Bn
AI0 to B0
AI1 – AI3 to B1 – B3
AI4 – AI6 to B4 – B6
Disable Bn outputs
Disable B0 outputs
Disable B1 – B3 outputs
Disable B4 – B6 outputs
Bn to AOn
B0 to AO0
B1 – B3 to AO1 – AO3
B4 – B6 to AO4 – AO6
Disable AOn outputs
Disable AO0 outputs
Disable AO1 – AO3 outputs
Disable AO4 – AO6 outputs
NOTES:
H
L
X
Z
—
H** =
B*
=
=
=
=
=
High voltage level
Low voltage level
Don’t care
High-impedance (OFF) state
Input not externally driven
Goes to level of pull-up voltage
Precaution should be taken to ensure B inputs do not float.
If they do, they are equal to Low state.
=
Z
—
H** =
B*
=
=
High-impedance (OFF) state
Input not externally driven
Goes to level of pull-up voltage
Precaution should be taken to ensure B inputs do not float.
If they do, they are equal to Low state.
=