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SN74HC148D Arkusz danych(PDF) 7 Page - Texas Instruments

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Numer części SN74HC148D
Szczegółowy opis  8-LINE TO 3-LINE PRIORITY ENCODERS
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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
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SN74HC148D Arkusz danych(HTML) 7 Page - Texas Instruments

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SN54HC148, SN74HC148
8LINE TO 3LINE PRIORITY ENCODERS
SCLS109G − MARCH 1984 − REVISED APRIL 2004
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
0 1
23
4
5
67 EI
EO A0
A1
A2 GS
’HC148
0 1
23
4
5
67 EI
EO
A0
A1
A2
GS
’HC148
’HC08
0 1
2 3
4
5
6 7
8 9 10 11 12 13 14 15
Enable
(active low)
01
2
3
Encoded Data (active low)
Priority Flag
(active low)
16-Line Data (active low)
0 1
23
4
5
67 EI
EO A0
A1
A2 GS
’HC148
0 1
23
4
5
67 EI
EO
A0
A1
A2
GS
’HC148
’HC00
0 1
2 3
4
5
6 7
8 9 10 11 12 13 14 15
Enable
(active low)
01
2
3
Encoded Data (active high)
Priority Flag
(active high)
16-Line Data (active low)
Figure 2. Priority Encoder for 16 Bits
Because the ’HC148 devices are combinational logic circuits, wrong addresses can appear during input transients.
Moreover, a change from high to low at EI can cause a transient low on GS when all inputs are high. This must be
considered when strobing the outputs.


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