2-INPUT MULTIPLEXER. MC74ACT258 Datasheet

MC74ACT258 MULTIPLEXER. Datasheet pdf. Equivalent

Part MC74ACT258
Description QUAD 2-INPUT MULTIPLEXER
Feature ( DataSheet : www.DataSheet4U.com ) MC74AC258 MC74ACT258 Quad 2ĆInput Multiplexer with 3ĆState Outp.
Manufacture Motorola
Datasheet
Download MC74ACT258 Datasheet

( DataSheet : www.DataSheet4U.com ) MC74AC258 MC74ACT258 Qu MC74ACT258 Datasheet
Recommendation Recommendation Datasheet MC74ACT258 Datasheet




MC74ACT258
( DataSheet : www.DataSheet4U.com )
MC74AC258
MC74ACT258
Quad 2ĆInput Multiplexer
with 3ĆState Outputs
The MC74AC258/74ACT258 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 outputs 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.
Multiplexer Expansion by Tying Outputs Together
Inverting 3-State Outputs
Outputs Source/Sink 24 mA
• ′ACT258 Has TTL Compatible Inputs
VCC OE I0c I1c Zc I0d I1d Zd
16 15 14 13 12 11 10 9
QUAD 2-INPUT
MULTIPLEXER WITH
3-STATE OUTPUTS
N SUFFIX
CASE 648-08
PLASTIC
12345678
S I0a I1a Za I0b I1b Zb GND
PIN NAMES
S
OE
I0a–I0d
I1a–I1d
Za–Zd
Common Data Select Input
3-State Output Enable Input
Data Inputs from Source 0
Data Inputs from Source 1
3-State Multiplexer Outputs
TRUTH TABLE
Output
Enable
Select
Input
OE S
HX
LH
LH
LL
LL
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Z = High Impedance
Data
Inputs
I0 I1
XX
XL
XH
LX
HX
Outputs
Z
Z
H
L
H
L
D SUFFIX
CASE 751B-05
PLASTIC
LOGIC SYMBOL
OE I0a I1a I0b I1b I0c I1c I0d I1d
S
Za Zb Zc Zd
www.DataSheet4U.com
FACT DATA
5-1
www.DataSheet4U.com



MC74ACT258
MC74AC258 MC74ACT258
FUNCTIONAL DESCRIPTION
The MC74AC258/74ACT258 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 I0x inputs are selected and when
Select is HIGH, the I1x inputs are selected. The data on the
selected inputs appears at the outputs in inverted form. The
MC74AC258/74ACT258 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:
Za = OE(I1aS+I0aS)
Zb = OE(I1bS+I0bS)
Zc = OE(I1cS+I0cS)
Zd = OE(I1dS+I0dS)
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 the
Output Enable signals to 3-state devices whose outputs are
tied together are designed so there is no overlap.
OE I0a
LOGIC DIAGRAM
I1a I0b
I1b I0c
I1c I0d
I1d S
Za Zb Zc Zd
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
FACT DATA
5-2





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)