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74ACT258SCX

P1-P3P4-P6P7-P9P10-P10
tm
74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
April 2007
©1988 Fairchild Semiconductor Corporation www.fairchildsemi.com
74ACT258 Rev. 1.4
74ACT258
Quad 2-Input Multiplexer with 3-STATE Outputs
Features
■
I
CC
and I
OZ
reduced by 50%
■
Multiplexer expansion by tying outputs together
■
Inverting 3-STATE outputs
■
Outputs source/sink 24mA
■
TTL-compatible inputs
General Description
The ACT258 is a quad 2-input multiplexer with 3-STATE
outputs. Four bits of data from two sources can be
selected using a common data select input. The four out-
puts present the selected data in the complement
(inverted) form. The outputs may be switched to a high
impedance state with a HIGH on the common Output
Enable (OE
) input, allowing the outputs to interface
directly with bus-oriented systems.
Ordering Information
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering number.
Connection Diagram Pin Description
Order
Number
Package
Number Package Description
74ACT258SC M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012,
0.150” Narrow Body
74ACT258SJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE 11, 5.3mm Wide
74ACT258MTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153,
4.4mm Wide
Pin Names Description
S Common Data Select Input
OE
3-STATE Output Enable Input
I
0a
–I
0d
Data Inputs from Source 0
I
1a
–I
1d
Data Inputs from Source 1
Z
a
–Z
d
3-STATE Inverting Data Outputs
FACT™ is a trademark of Fairchild Semiconductor Corporation.
74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
©1988 Fairchild Semiconductor Corporation www.fairchildsemi.com
74ACT258 Rev. 1.4 2
Logic Symbol
IEEE/IEC
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Z
=
High Impedance
Functional Description
The ACT258 is a quad 2-input multiplexer with 3-STATE
outputs. It selects four bits of data from two sources
under control of a common Select input (S). When the
Select input is LOW, the I
0x
inputs are selected and
when Select is HIGH, the I
1x
inputs are selected. The
data on the selected inputs appears at the outputs in
inverted form. The ACT258 is the logic implementation
of a 4-pole, 2-position switch where the position of the
switch is determined by the logic levels supplied to the
Select input. The logic equations for the outputs are
shown below:
Z
a
=
OE
• (I
1a
• S + I
0a
• S
)
Z
b
=
OE
• (I
1b
• S + I
0b
• S
)
Z
c
=
OE
• (I
1c
• S + I
0c
• S
)
Z
d
=
OE
• (I
1d
• S + I
0d
• S
)
When the Output Enable input (OE
) is HIGH, the outputs
are forced to a high impedance state. If the outputs of
the 3-STATE devices are tied together, all but one
device must be in the high impedance state to avoid high
currents that would exceed the maximum ratings.
Designers should ensure that Output Enable signals to
3-STATE devices whose outputs are tied together are
designed so there is no overlap.
Output
Enable
Select
Input
Data
Inputs Outputs
OE SI
0
I
1
Z
HXXXZ
LHXLH
LHXHL
74ACT258 Quad 2-Input Multiplexer with 3-STATE Outputs
©1988 Fairchild Semiconductor Corporation www.fairchildsemi.com
74ACT258 Rev. 1.4 3
Logic Diagram
Please note that this diagram is provided only for the understanding of logic operations and should not be used to
estimate propagation delays.
Figure 1.
P1-P3P4-P6P7-P9P10-P10

74ACT258SCX

Mfr. #:
Buy 74ACT258SCX
Manufacturer:
ON Semiconductor / Fairchild
Description:
Encoders, Decoders, Multiplexers & Demultiplexers Qd 2-Inp Multiplexer
Lifecycle:
New from this manufacturer.
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