Datasheet

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SCLS109G − MARCH 1984 − REVISED APRIL 2004
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
01234567EI
EO A0 A1 A2 GS
’HC148
01234567EI
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)
012 3
Encoded Data (active low)
Priority Flag
(active low)
16-Line Data (active low)
01234567EI
EO A0 A1 A2 GS
’HC148
01234567EI
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)
012 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.