MC74HC158A(1996) 查看數據表（PDF） - Motorola => Freescale

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MC74HC158A
(Rev.:1996)

Quad 2-Input Data Selector/Multiplexer

Motorola => Freescale 

MC74HC158A

PIN DESCRIPTIONS

INPUTS

A0–A3 (Pins 2,5,11,14)

Nibble A inputs. The data present on these pins is trans-

ferred 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 HC158A.

B0–B3 (Pins 3,6,10,13)

Nibble B inputs. The data present on these pins is trans-

ferred 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 HC158A.

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

HC158A. For the Output Enable input at a high level, the out-

puts are at a high level for the HC158A.

CONTROL INPUTS

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.

Output Enable (Pin 15)

Output Enable input. A low level on thisinput allows the

selected data to be presented at the outputs. A high level on

this input sets all of the outputs to a high level for the HC158A.

2

A0

3

B0

5

A1

Nibble

Inputs

6

B1

11

A2

10

B2

14

A3

13

B3

15

Output Enable

1

Select

4

Y0

7

Y1

Data

Outputs

9

Y2

12

Y3

Figure 5. Expanded Logic Diagram

High–Speed CMOS Logic Data

3–5

DL129 — Rev 6

MOTOROLA

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