MC74HC158 Motorola Semiconductor, MC74HC158 Datasheet - Page 4

• Manufacturer Part Number: MC74HC158
• Description: Quad 2-Input Data Selector / Multiplexer
• Manufacturer: Motorola Semiconductor

MOTOROLA
INPUTS
A0–A3 (Pins 2,5,11,14)
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 HC158.
B0–B3 (Pins 3,6,10,13)
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 HC158.
OUTPUTS
Y0–Y3 (Pins 4,7,9,12)
these outputs when the Output Enable input is at a low level.
MC54/74HC158
Nibble A inputs. The data present on these pins is trans-
Nibble B inputs. The data present on these pins is trans-
Data outputs. The selected input nibble is presented at
Nibble
Inputs
Output Enable
Select
A0
B0
A1
B1
A2
B2
A3
B3
2
3
5
6
11
10
14
13
15
1
Figure 5. Expanded Logic Diagram
PIN DESCRIPTIONS
4
The data present on these pins is in its inverted form for the
HC158. For the Output Enable input at a high level, the outputs
are at a high level for the HC158.
CONTROL INPUTS
Select (Pin 1)
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)
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 HC158.
Nibble select. This input determines the data word to be
Output Enable input. A low level on thisinput allows the
High–Speed CMOS Logic Data
12
4
7
9
Y0
Y1
Y2
Y3
Data
Outputs
DL129 — Rev 6