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MC74LCX258 데이터시트(PDF) 2 Page - ON Semiconductor

부품명 MC74LCX258
상세설명  Low-Voltage CMOS Quad 2-Input Multiplexer With 5 V?뭈olerant Inputs and Outputs (3?뭆tate, Inverting)
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
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MC74LCX258
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2
Figure 1. Pinout: 16−Lead Plastic Package
(Top View)
15
16
14
13
12
11
10
2
1
3456
7
VCC
9
8
OE
A3
B3
Y3
A2
B2
Y2
S
A0
B0
Y0
A1
B1
Y1
GND
PIN NAMES
Pins
Function
An
Source 0 Data Inputs
Bn
Source B Data Inputs
OE
Enable Input
S
Select Input
Yn
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
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.
OUTPUTS
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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