MC74LCX258(2012) 데이터 시트보기 (PDF) - ON Semiconductor

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MC74LCX258
(Rev.:2012)

Low-Voltage CMOS Quad 2-Input Multiplexer

ON Semiconductor 

MC74LCX258

VCC 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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