MC74LCX258_12 Datasheet, PDF (2/10 Pages) ON Semiconductor – Low-Voltage CMOS Quad 2-Input Multiplexer

MC74LCX258
V_CC OE A3 B3 Y3 A2 B2 Y2
16 15 14 13 12 11 10 9
12345678
S A0 B0 Y0 A1 B1 Y1 GND
Figure 1. Pinout: 16−Lead Plastic Package
(Top View)
PIN NAMES
Pins
An
Bn
OE
S
Yn
Function
Source 0 Data Inputs
Source B Data Inputs
Enable Input
Select Input
Outputs
TRUTH TABLE
Inputs
Outputs
Output Enable
Select
Y0−Y3
H
X
Z
L
L
A0−A3
L
H
B0−B3
X = Don’t Care
A0−A3, B0−B3 = The levels of the respective Data−Word Inputs
PIN DESCRIPTIONS
INPUTS
OUTPUTS
A0−A3 (Pins 2, 5, 11, 14)
Nibble A inputs. The data present on these pins is
transferred to the outputs when the Select input is at a low
level and the Output Enable input is at a low level. The data
is presented to the outputs in inverted form for the LCX258.
B0−B3 (Pins 3, 6, 10, 13)
Nibble B inputs. The data present on these pins is
transferred to the outputs when the Select input is at a high
level and the Output Enable input is at a low level. The data
is presented to the outputs in inverted form for the LCX258.
Y0−Y3 (Pins 4, 7, 9, 12)
Data outputs. The selected input nibble is presented at
these outputs when the Output Enable input is at a low level.
The data present on these pins is in its inverted form for the
LCX258. For the Output Enable input at a high level, the
outputs are at a high level for the LCX258.
Select (Pin 1)
Nibble select. This input determines the data word to be
transferred to the outputs. A low level on this input selects
the A inputs and a high level selects the B inputs.
CONTROL INPUTS
Output Enable (Pin 15)
Output Enable input. A low level on this input allows the
selected data to be presented at the outputs. A high level on
this input sets all of the outputs to 3−state off.
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